Self-cooling synchronous pulley

Abstract

The utility model discloses a self-radiating synchronous pulley. A plurality of wheel teeth are arranged on the surface of the self-heat-dissipation synchronous belt wheel; a cavity is formed in the synchronous belt wheel, and first heat dissipation holes penetrating to the cavity in the first direction are formed between wheel teeth. A plurality of second heat dissipation holes penetrating through the cavity in the second direction are formed in the side face of the synchronous belt wheel, and the second heat dissipation holes are formed around the axis of the synchronous belt wheel. The mounting hole of the synchronous pulley is a square mounting hole. According to the utility model, the synchronous pulley is provided with the first heat dissipation hole, the second heat dissipation hole and the cavity; the first heat dissipation holes aim at solving the problem that the edge position of the synchronous belt wheel is too high. The second heat dissipation holes and the cavity aim to solve the problem that heat is accumulated at the joint of the synchronous belt wheel and the rotating shaft, heat at the meshing position of the synchronous belt wheel enters the cavity through the first heat dissipation holes, the accumulated heat at the joint of the synchronous belt wheel and the rotating shaft flows into the cavity due to heat conduction, and then the temperature in the cavity is reduced through the second heat dissipation holes.

Description

Technical Field

[0001] The utility model relates to the technical field of synchronous pulleys, in particular to a self-heating synchronous pulley. Background Art

[0002] Synchronous pulleys are generally made of steel, aluminum alloy, cast iron, brass and other materials, and their inner holes are round holes, D-shaped holes, tapered holes, etc. Synchronous pulley transmission consists of a closed ring belt with equally spaced teeth on the inner surface and a corresponding pulley.

[0003] After the synchronous pulley works for a long time, part of the mechanical energy is converted into heat energy, causing the pulley to heat up. The heating of the synchronous pulley will reduce the working efficiency of the machine, accelerate the aging of the synchronous pulley, and the synchronous pulley is easy to break, causing safety problems. The main heating areas are mainly concentrated in the meshing tooth surface and the connection of the rotating shaft. The former is the heat generated by friction during meshing, and the latter is the mechanical energy loss converted into heat energy and retained at the connection between the synchronous pulley and the rotating shaft. Due to these two heat sources, the thermal field of the synchronous pulley presents a concentric circle state, that is, the temperature at the axis and surface of the synchronous pulley is higher, and the temperature in the middle of the two positions is lower. The residual heat on the surface is easy to cause the synchronous belt to age and break, and the residual heat in the center is easy to cause the gap between the synchronous pulley and the rotating shaft to increase, further causing vibration and noise. In the case of vibration, the synchronous pulley and the rotating shaft will resonate, accelerating the loss of the synchronous pulley. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a self-heating synchronous pulley, which can solve at least one of the problems mentioned in the above background technology.

[0005] According to one aspect of the utility model, a self-heating synchronous pulley is provided, wherein a plurality of gear teeth are arranged on the surface of the synchronous pulley; a cavity is arranged inside the synchronous pulley, and first heat dissipation holes are arranged between the gear teeth and penetrate the cavity along a first direction; a plurality of second heat dissipation holes are arranged on the side of the synchronous pulley and penetrate the cavity along a second direction, and the second heat dissipation holes are arranged around the axis of the synchronous pulley; the mounting hole of the synchronous pulley is a square mounting hole.

[0006] In the above technical solution, the first heat dissipation hole, the second heat dissipation hole and the cavity are respectively set on the synchronous pulley to solve the problem of the edge position of the synchronous pulley being too high. When the traditional synchronous pulley is engaged with the synchronous belt, friction generates heat. This part of the heat cannot be quickly discharged, resulting in heat accumulation, and the first heat dissipation hole is used to use the airflow generated when the synchronous pulley is engaged with the synchronous belt to quickly bring the heat into the cavity inside the synchronous pulley, thereby alleviating the heat accumulation at the edge; the second heat dissipation hole and the cavity are used to solve the heat accumulation at the connection between the synchronous pulley and the rotating shaft. The heat at the meshing point of the synchronous pulley enters the cavity through the first heat dissipation hole, and the heat accumulated at the connection between the synchronous pulley and the rotating shaft will also flow into the cavity due to heat conduction. The heat at both positions is balanced through the cavity so that the overall temperature of the synchronous pulley is in a relatively balanced state. It can be seen from the air pressure formula that the temperature rises and the pressure decreases. Since the synchronous pulley will gradually heat up during operation, the air pressure inside the cavity will gradually decrease. In order to further solve the problem of heat dissipation, a second heat dissipation hole is set. According to the airflow conduction method, the airflow flows from high pressure to low pressure. Setting the second heat dissipation hole helps to draw the external low-temperature airflow into the cavity and reduce the temperature inside the cavity. If the second heat dissipation hole is not set, the airflow will be introduced into the cavity through the first heat dissipation hole, and the problem of internal heat accumulation cannot be solved. In order to further balance the cooling inside the cavity, the second heat dissipation hole is further set around the axis of the synchronous pulley, so that the whole is in a more balanced state. At the same time, if the second heat dissipation hole is opened at will, it will cause the center of gravity to shift when the synchronous pulley rotates, resulting in polarization.

[0007] In some embodiments, the synchronous pulley includes a first wheel group and a second wheel group, and a plurality of gear teeth are arranged on the surface of the first wheel group and the surface of the second wheel group; an annular groove is arranged between the first wheel group and the second wheel group; a first cavity is arranged inside the first wheel group, and a second cavity is arranged inside the second wheel group.

[0008] In the above technical solution, the synchronous pulleys are symmetrically arranged to increase the cavity volume and the number of heat dissipation holes. The heat dissipation holes and cavities of the first wheel group and the second wheel group form opposite heat flow conduction, accelerate the gas flow in the internal cavity, and further improve the heat dissipation efficiency.

[0009] In some embodiments, the cross-sectional shape of the first heat dissipation hole may be square or circular.

[0010] In the above technical solution, if the cross-section of the first heat dissipation hole is square, the area of ​​airflow can be increased. If it is circular, the speed of airflow can be increased by using the slit effect.

[0011] In some embodiments, the cross-sectional shape of the first heat dissipation hole is square, and a guide groove is respectively provided on the four walls of the first heat dissipation hole; the guide groove is sequentially provided with a first guide section, a second guide section and a third guide section along the direction from the surface of the synchronous pulley to the cavity, and the width ratio of the first guide section, the second guide section and the third guide section is 1:0.653:0.237.

[0012] In the above technical solution, the purpose of adding a guide groove is to reduce noise. At the moment when the synchronous pulley and the synchronous belt are engaged, vibration is caused by the impact force of the connection and the impact force of the engagement. At the same time, due to the first heat dissipation hole, the airflow at the engagement is relatively turbulent. The noise generated during the engagement will be transmitted around through the turbulent airflow, and the turbulent airflow will also cause the airflow to not flow well into the cavity. Therefore, a plurality of guide grooves are arranged on the inner wall of the first heat dissipation hole to guide the airflow into the cavity, thereby improving the heat dissipation efficiency and reducing the noise. Furthermore, in order to increase the guiding effect of the guide groove, the width of the guide groove at different positions is set to increase the guiding effect. At the same time, the design of a large opening and a small outlet can give the guide groove the advantage of a narrow tube effect and increase the airflow velocity. Furthermore, the above-mentioned width ratio is the optimal parameter obtained through the airflow simulation test, which can maximize the guiding effect.

[0013] In some embodiments, the cross-sectional shape of the first heat dissipation hole is circular, and a spiral groove is provided on the wall of the first heat dissipation hole; the spiral groove is provided with a first spiral segment, a second spiral segment and a third spiral segment in sequence along the surface of the synchronous pulley to the cavity, and the pitch ratio of the first spiral segment, the second spiral segment and the third spiral segment is 1:0.511:0.331.

[0014] In the above technical solution, the purpose of adding spiral grooves is to reduce noise and increase the airflow velocity. At the moment when the synchronous pulley and the synchronous belt are engaged, vibration is caused by the impact force of the connection and the impact force of the engagement. At the same time, due to the first heat dissipation hole, the airflow at the engagement is relatively turbulent. The noise generated during the engagement will be transmitted around through the turbulent airflow, and the turbulent airflow will also cause the airflow to be unable to flow into the cavity well. Therefore, a multi-section guide section is set on the inner wall of the first heat dissipation hole to guide the airflow into the cavity, improve the heat dissipation efficiency and reduce the noise. Furthermore, in order to increase the guiding effect of the guide section, the pitch of the guide section at different positions is set to increase the airflow velocity. Further, the above pitch ratio is the optimal parameter obtained through the airflow simulation test, which can maximize the guiding effect.

[0015] In some embodiments, the cavity includes a bottom surface, on which a plurality of guide ribs are arranged around the axis of the synchronous pulley, and the gaps formed between the guide ribs are opposite to the first heat dissipation holes; the guide ribs are distributed in three sections along the length direction, and the height ratio is 0.213:1:0.213.

[0016] In the above technical solution, due to the rotation of the cavity, the internal airflow will be spiral, but the sizes of the first heat dissipation hole and the second heat dissipation hole are different, so that the pressure surface of the first heat dissipation hole and the second heat dissipation hole are different, which makes it easy to destroy the spiral state when the airflow in the tooth flows into the suction surface, thereby generating noise. In view of this, a number of guide ribs are arranged around the axis of the synchronous pulley on the bottom surface of the surface of the cavity, and the interval formed between the guide ribs is directly opposite to the first heat dissipation hole; the advantage of such a setting is to stabilize the spiral airflow. When the airflow enters the cavity through the first heat dissipation hole, it immediately enters the guide rib. Since the synchronous pulley is in a rotating state, the guide rib will gradually guide the airflow to form a spiral state. Further, in order to better suppress noise, the guide rib is designed to be a three-stage distribution of low, high and low, and the height ratio is 0.213:1:0.213. The purpose of such a setting is that if the height of the guide ribs is the same, a blade tip vortex will be generated when the airflow enters the cavity, thereby generating noise. Therefore, the low, high and low design helps to suppress turbulence and blade tip vortex, and further reduce the generation of noise.

[0017] In some embodiments, a push rod mechanism is provided in the cavity;

[0018] The push rod mechanism includes a push rod, a rack is arranged at the root of the push rod, and the push rod extends into the cavity through the first heat dissipation hole; the push rod mechanism is also provided with a driving gear matched with the rack, and a driving device for driving the gear.

[0019] In the above technical solution, due to the design of the synchronous belt pulley in this case, when the synchronous belt is running at high speed, the middle area of ​​the synchronous belt will be easily stuck in the ring groove, and the two sides of the synchronous belt will be slightly tilted, which will not have any impact during normal operation. However, when the synchronous belt is disassembled, especially when the master and slave synchronous belt pulleys are not disassembled and the synchronous belt pulleys are easy to rotate, the synchronous belt is difficult to pull out from the synchronous belt pulley. In view of this, a mechanism that is easy to disassemble the synchronous belt is designed by utilizing the internal space of the cavity and the first heat dissipation hole. During disassembly, the mechanism can be used to use the cooperation of the gear and the push rod to push out the synchronous belt. After being pushed out, the push rod is stuck and the synchronous belt is pulled out using an auxiliary tool to achieve the disassembly of the synchronous belt.

[0020] In some embodiments, the synchronous pulley is disposed in a transmission mechanism, and the transmission mechanism includes: a synchronous belt, a driving synchronous pulley, a driven synchronous pulley, a driving shaft, and a driven shaft;

[0021] The driving synchronous pulley and the driven synchronous pulley are the self-heating synchronous pulleys mentioned above; one side of the synchronous belt having convex teeth is provided with a protrusion that fits with the annular groove.

[0022] In the above technical solution, a transmission mechanism is established based on a self-heat dissipating synchronous pulley. Thanks to the self-heat dissipating effect of the synchronous pulley, the synchronous pulley can withstand a faster transmission speed, thereby improving the transmission efficiency of the transmission mechanism. At the same time, due to the ring groove design of the self-heat dissipating synchronous pulley, a protrusion is further designed on the synchronous belt, so that the entire transmission mechanism will not cause the synchronous belt to deviate under the cooperation of the ring groove and the protrusion.

[0023] In some embodiments, the transmission mechanism further comprises: a tensioning mechanism;

[0024] The tensioning mechanism includes: a driving gear, a rack plate and a driven gear; the two sides of the rack plate are respectively meshed with the driving gear and the driven gear; a rotating shaft is connected to the rack plate, and the rotating shaft is rotatably connected to a tensioning wheel, and a connecting groove that matches the protrusion is provided on the surface of the tensioning wheel, and abuts against the protrusion of the synchronous belt.

[0025] In the above technical solution, a tensioning mechanism is established based on a self-heat dissipating synchronous belt pulley. Thanks to the annular groove of the synchronous belt pulley, a protruding part is designed on the synchronous belt so that the entire transmission mechanism will not cause the synchronous belt to deviate under the cooperation of the annular groove and the protruding part. On this basis, the tensioning mechanism is designed using the protruding part of the synchronous belt. Traditional tensioning mechanisms mostly adopt an additional synchronous belt pulley as a tensioning wheel set in the mechanism. The disadvantage of such a setting is that an additional synchronous belt pulley and an additional heat accumulation will affect the life of the synchronous belt, and will also generate noise and vibration accordingly. In this case, thanks to the annular groove design of the self-heat dissipating synchronous belt pulley and the protruding part of the synchronous belt, only a tensioning wheel that matches the protruding part needs to be designed to press the main synchronous belt to achieve the tensioning effect. At the same time, since the tensioning wheel does not need to mesh with the synchronous belt, it will not generate heat accumulation and vibration. Furthermore, although such a setting will increase the stress in the center of the synchronous belt, due to the setting of the protruding part, the synchronous belt will not cause excessive loss. During use, the rack plate is adjusted to move up and down by rotating the active gear, thereby controlling the size of the tensioning force.

[0026] According to another aspect of the utility model, a method for using a self-heating synchronous pulley is provided, based on the above-mentioned self-heating synchronous pulley, comprising:

[0027] The driving shaft is installed in the square mounting hole of the driving synchronous pulley, and the driven shaft is installed in the square mounting hole of the driven synchronous pulley;

[0028] The protruding part of the synchronous belt is clamped into the annular grooves of the driving synchronous belt pulley and the driven synchronous belt pulley, and the teeth of the synchronous belt are meshed with the driving synchronous belt pulley and the driven synchronous belt pulley;

[0029] The groove of the tension wheel is brought into contact with the protrusion of the synchronous belt, and the driving gear is rotated to drive the rack plate and the driven gear to rotate to adjust the tension of the synchronous belt;

[0030] When removing the synchronous belt, first release the tension, adjust the driving gear to push the push rod out of the first heat dissipation hole, and rotate the active synchronous belt wheel to drive the meshing teeth and the protrusion to gradually come out of the synchronous belt wheel.

[0031] In the above technical solution, the first heat dissipation hole, the second heat dissipation hole and the cavity are respectively set on the synchronous pulley to solve the problem of the edge position of the synchronous pulley being too high. When the traditional synchronous pulley is engaged with the synchronous belt, friction generates heat. This part of the heat cannot be quickly discharged, resulting in heat accumulation, and the first heat dissipation hole is used to use the airflow generated when the synchronous pulley is engaged with the synchronous belt to quickly bring the heat into the cavity inside the synchronous pulley, thereby alleviating the heat accumulation at the edge; the second heat dissipation hole and the cavity are used to solve the heat accumulation at the connection between the synchronous pulley and the rotating shaft. The heat at the meshing point of the synchronous pulley enters the cavity through the first heat dissipation hole, and the heat accumulated at the connection between the synchronous pulley and the rotating shaft will also flow into the cavity due to heat conduction. The heat at both positions is balanced through the cavity so that the overall temperature of the synchronous pulley is in a relatively balanced state. It can be seen from the air pressure formula that the temperature rises and the pressure decreases. Since the synchronous pulley will gradually heat up during operation, the air pressure inside the cavity will gradually decrease. In order to further solve the problem of heat dissipation, a second heat dissipation hole is set. According to the airflow conduction method, the airflow flows from high pressure to low pressure. Setting the second heat dissipation hole helps to draw the external low-temperature airflow into the cavity and reduce the temperature inside the cavity. If the second heat dissipation hole is not set, the airflow will be introduced into the cavity through the first heat dissipation hole, and the problem of internal heat accumulation cannot be solved. In order to further balance the cooling inside the cavity, the second heat dissipation hole is further set around the axis of the synchronous pulley, so that the whole is in a more balanced state. At the same time, if the second heat dissipation hole is opened at will, it will cause the center of gravity to shift when the synchronous pulley rotates, resulting in polarization.

[0032] The transmission mechanism is established based on the self-heating synchronous pulley. Thanks to the self-heating effect of the synchronous pulley, the synchronous pulley can withstand a faster transmission speed, thereby improving the transmission efficiency of the transmission mechanism. At the same time, due to the ring groove design of the self-heating synchronous pulley, a protrusion is further designed on the synchronous belt, so that the entire transmission mechanism will not cause the synchronous belt to deviate under the cooperation of the ring groove and the protrusion.

[0033] Based on the self-heat dissipation synchronous belt pulley, a tensioning mechanism is established. Thanks to the annular groove of the synchronous belt pulley, the protrusion of the synchronous belt is designed so that the entire transmission mechanism will not cause the synchronous belt to deviate under the cooperation of the annular groove and the protrusion. On this basis, the tensioning mechanism is designed using the protrusion of the synchronous belt. Traditional tensioning mechanisms are mostly set up by adding a synchronous belt pulley as a tensioning wheel in the mechanism. The disadvantage of such a setting is that one more synchronous belt pulley and one more part of accumulated heat will affect the life of the synchronous belt, and will also generate noise and vibration accordingly. In this case, thanks to the annular groove design of the self-heat dissipation synchronous belt pulley and the protrusion of the synchronous belt, only a tensioning wheel that matches the protrusion needs to be designed to press the main synchronous belt to achieve the tensioning effect. At the same time, since the tensioning wheel does not need to mesh with the synchronous belt, it will not generate heat accumulation and vibration. Furthermore, although such a setting will increase the stress in the center of the synchronous belt, due to the setting of the protrusion, the synchronous belt will not cause excessive loss.

[0034] Due to the design of the synchronous belt pulley in this case, when the synchronous belt is running at high speed, the middle area of ​​the synchronous belt will be easily stuck in the ring groove, and the two sides of the synchronous belt will be slightly tilted, which will not have an impact during normal operation. However, when the synchronous belt is disassembled, especially when the master and slave synchronous belt pulleys are not disassembled and the synchronous belt pulleys are easy to rotate, the synchronous belt is difficult to pull out from the synchronous belt pulley. In view of this, a mechanism that is easy to disassemble the synchronous belt is designed by utilizing the internal space of the cavity and the first heat dissipation hole. During disassembly, the mechanism can use the cooperation of the gear and the ejector rod to eject the synchronous belt. After ejection, the ejector rod is stuck and the synchronous belt is pulled out using an auxiliary tool to achieve the disassembly of the synchronous belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 This is a three-dimensional structural diagram of a synchronous pulley of one embodiment of a self-heat dissipating synchronous pulley of the utility model;

[0037] Figure 2 It is a schematic cross-sectional view of the interior of a cavity of one embodiment of a self-heat dissipating synchronous pulley of the utility model;

[0038] Figure 3 This is a schematic diagram of the size and structure of the guide groove of one embodiment of a self-heat dissipating synchronous pulley of the utility model;

[0039] Figure 4It is a schematic diagram of the spiral groove size structure of one embodiment of a self-heat dissipating synchronous pulley of the utility model;

[0040] Figure 5 This is a schematic diagram of the guide rib structure of one embodiment of a self-heat dissipating synchronous pulley of the utility model;

[0041] Figure 6 It is a schematic diagram of the height ratio of the guide ribs of one embodiment of a self-heat dissipating synchronous pulley of the utility model;

[0042] Figure 7 This is a three-dimensional structural diagram of a synchronous pulley of a second embodiment of a self-heat dissipating synchronous pulley of the utility model;

[0043] Figure 8 This is a schematic diagram of the cross-sectional structure of a synchronous pulley of the second embodiment of a self-heating synchronous pulley of the utility model.

[0044] Fig. 9 This is one of the schematic diagrams of the structure of the ejector mechanism in the cross section of the synchronous pulley cavity of the third embodiment of the self-heat dissipating synchronous pulley of the utility model;

[0045] Fig.10 This is the second schematic diagram of the structure of the ejector mechanism in the cross section of the synchronous pulley cavity of the third embodiment of the self-heat dissipating synchronous pulley of the utility model;

[0046] Fig.11 This is one of the schematic diagrams of the transmission mechanism structure of the synchronous pulley of the fourth embodiment of the self-heat dissipating synchronous pulley of the utility model;

[0047] Fig.12 This is the second schematic diagram of the transmission mechanism structure of the synchronous pulley of the fourth embodiment of the self-heat dissipating synchronous pulley of the utility model;

[0048] Fig.13 This is one of the structural schematic diagrams of the tensioning mechanism of the synchronous pulley of the fifth embodiment of the self-heat dissipating synchronous pulley of the utility model;

[0049] Fig.14 This is one of the structural schematic diagrams of the tensioning mechanism of the synchronous pulley of the fifth embodiment of the self-heat dissipating synchronous pulley of the utility model. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is particularly noted that the following embodiments are only used to illustrate the present invention, but do not limit the scope of the present invention. Similarly, the following embodiments are only partial embodiments of the present invention rather than all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] The utility model provides a self-heat dissipating synchronous pulley, which can solve at least one problem mentioned in the above background technology.

[0052] Embodiment 1

[0053] See also Figure 1 , Figure 2 A self-heating synchronous pulley, a plurality of gear teeth are arranged on the surface of the synchronous pulley 1; a cavity 11 is arranged inside the synchronous pulley 1, and a first heat dissipation hole 12 is arranged between the gear teeth along a first direction A and penetrates the cavity 11; a plurality of second heat dissipation holes 13 are arranged on the side of the synchronous pulley along a second direction B and penetrate the cavity, and the second heat dissipation holes 13 are arranged around the axis of the synchronous pulley; the mounting hole 14 of the synchronous pulley is a square mounting hole.

[0054] In this embodiment, the cross-sectional shape of the first heat dissipation hole 12 can be square or circular. If the cross-sectional shape of the first heat dissipation hole is square, the area of ​​airflow can be increased. If the cross-sectional shape of the first heat dissipation hole is circular, the speed of airflow can be increased by using the slit effect. The drawings of this specification take a square as an example for illustration, and a circular example is not drawn.

[0055] As a preferred embodiment, the cross-sectional shape of the first heat dissipation hole 12 is square, and the four walls of the first heat dissipation hole 12 are respectively provided with a guide groove 121; Figure 3 , the guide groove is provided with a first guide section S1, a second guide section S2 and a third guide section S3 in sequence along the surface of the synchronous pulley to the direction of the cavity, and the width ratio of the first guide section S1, the second guide section S2 and the third guide section S3 is 1:0.653:0.237. The purpose of adding the guide groove is to reduce noise. At the moment of meshing of the synchronous pulley and the synchronous belt, vibration is caused by the impact force of the connection and the impact force of the meshing. At the same time, due to the first heat dissipation hole, the airflow at the meshing point is relatively turbulent. The noise generated during the meshing will be transmitted around through the turbulent airflow, and the turbulent airflow will also cause the airflow to be unable to flow into the cavity well. Therefore, a plurality of guide grooves are arranged on the inner wall of the first heat dissipation hole to guide the airflow to flow into the cavity, improve the heat dissipation efficiency and reduce the noise. Furthermore, in order to increase the guiding effect of the guide groove, the width of the guide groove at different positions is set to increase the guiding effect. At the same time, the design of large opening and small outlet can give the guide groove the advantage of narrow tube effect and increase the airflow velocity. Furthermore, the above width ratio is the optimal parameter obtained through airflow simulation test, which can maximize the guide effect. It should be noted that in order to better highlight the effect of proportion, the aspect ratio of the figure has been processed to facilitate intuitively seeing the difference.

[0056] As an optional embodiment, the cross-sectional shape of the first heat dissipation hole 12 is circular, and the wall surface of the first heat dissipation hole is provided with a spiral groove 122; see Figure 4, the spiral groove 122 is provided with a first spiral segment P1, a second spiral segment P2 and a third spiral segment P3 in sequence along the surface of the synchronous pulley to the cavity. The pitch ratio of the first spiral segment P1, the second spiral segment P2 and the third spiral segment P3 is 1:0.511:0.331. It should be noted that only the pitch line is drawn in the figure, which is to better reflect the proportional relationship. The purpose of adding a spiral groove is to reduce noise and increase the airflow velocity. At the moment of meshing of the synchronous pulley and the synchronous belt, vibration is caused by the impact force of the connection and the impact force of the meshing. At the same time, due to the first heat dissipation hole, the airflow at the meshing point is relatively turbulent. The noise generated during meshing will be transmitted everywhere through the turbulent airflow, and the turbulent airflow will also cause the airflow to not flow into the cavity well. Therefore, a multi-section guide section is set on the inner wall of the first heat dissipation hole to guide the airflow into the cavity, thereby improving the heat dissipation efficiency and reducing the noise. Furthermore, in order to increase the guiding effect of the guide section, the pitch of the guide section at different positions is set to increase the airflow velocity. The above pitch ratio is the optimal parameter obtained through airflow simulation test, which can maximize the guiding effect. It should be noted that in order to better highlight the effect of proportion, the aspect ratio of the figure has been processed to facilitate intuitively seeing the difference.

[0057] As a preferred embodiment, please refer to Figure 5 The cavity includes a bottom surface 111, and a plurality of guide ribs 112 are arranged around the axis of the synchronous pulley on the bottom surface. The intervals formed between the guide ribs 112 face the first heat dissipation hole 12; please refer to Figure 6 , the guide ribs 112 are distributed in three sections, with the height ratio of H1:H2:H3 being 0.213:1:0.213. It should be noted that in order to maximize the effect of the guide ribs 112, the second heat dissipation holes 13 are preferably arranged in the gap formed between the two guide ribs 112, which also helps to improve the heat dissipation effect. In the figure, for the consistency of all the drawings of the embodiments, the second heat dissipation holes are not modified or scaled. At the same time, in order to more intuitively see the proportional relationship, Figure 6Modification is made to see the specific proportional relationship. As the cavity rotates, the internal airflow will be spiral, but the sizes of the first heat dissipation hole and the second heat dissipation hole are different, so that the pressure surface of the first heat dissipation hole and the second heat dissipation hole are different, which makes it easy to destroy the spiral state when the airflow inside the tooth flows into the suction surface, thereby generating noise. In view of this, a number of guide ribs are arranged around the axis of the synchronous pulley on the bottom surface of the surface of the cavity, and the interval formed between the guide ribs is directly opposite to the first heat dissipation hole; the advantage of this arrangement is to stabilize the spiral airflow. When the airflow enters the cavity through the first heat dissipation hole, it immediately enters the guide rib. Since the synchronous pulley is in a rotating state, the guide rib will gradually guide the airflow to form a spiral state. Further, in order to better suppress noise, the guide rib is designed to be a three-stage distribution of low, high and low, and the height ratio is 0.213:1:0.213. The purpose of this setting is that if the height of the guide ribs is the same, a blade tip vortex will be generated when the airflow enters the cavity, thereby generating noise. Therefore, the low, high and low design helps to suppress turbulence and blade tip vortex, and further reduce the generation of noise. It should be noted that in order to better highlight the effect of proportion, the aspect ratio of the image has been processed to make it easier to see the difference intuitively.

[0058] In this embodiment, in response to the two problems mentioned in the background technology, a first heat dissipation hole, a second heat dissipation hole and a cavity are respectively set on the synchronous pulley; the purpose of the first heat dissipation hole is to solve the problem that the edge position of the synchronous pulley is too high. When the traditional synchronous pulley is engaged with the synchronous belt, friction generates heat. This part of the heat cannot be quickly discharged, resulting in heat accumulation, and the purpose of the first heat dissipation hole is to use the airflow generated when the synchronous pulley is engaged with the synchronous belt to quickly bring the heat into the cavity inside the synchronous pulley, thereby alleviating the heat accumulation at the edge; the purpose of the second heat dissipation hole and the cavity is to solve the heat accumulation at the connection between the synchronous pulley and the rotating shaft. The heat at the meshing point of the synchronous pulley enters the cavity through the first heat dissipation hole, and the heat accumulated at the connection between the synchronous pulley and the rotating shaft will also flow into the cavity due to heat conduction. The heat at both positions is balanced through the cavity so that the overall temperature of the synchronous pulley is in a relatively balanced state. It can be seen from the air pressure formula that the temperature rises and the pressure decreases. Since the synchronous pulley will gradually heat up during operation, the air pressure inside the cavity will gradually decrease. In order to further solve the problem of heat dissipation, a second heat dissipation hole is set. According to the airflow conduction method, the airflow flows from high pressure to low pressure. Setting the second heat dissipation hole helps to draw the external low-temperature airflow into the cavity and reduce the temperature inside the cavity. If the second heat dissipation hole is not set, the airflow will be introduced into the cavity through the first heat dissipation hole, and the problem of internal heat accumulation cannot be solved. In order to further balance the cooling inside the cavity, the second heat dissipation hole is further set around the axis of the synchronous pulley, so that the whole is in a more balanced state. At the same time, if the second heat dissipation hole is opened at will, it will cause the center of gravity to shift when the synchronous pulley rotates, resulting in polarization.

[0059] Embodiment 2

[0060] See also Figure 7 , Figure 8 On the basis of one of the embodiments, the synchronous pulley includes a first wheel set 15 and a second wheel set 16, and a plurality of gear teeth are arranged on the surface of the first wheel set 15 and the surface of the second wheel set 16; an annular groove 17 is arranged between the first wheel set 15 and the second wheel set 16; a first cavity 151 is arranged inside the first wheel set 15, and a second cavity 161 is arranged inside the second wheel set.

[0061] In this embodiment, the synchronous pulleys are symmetrically arranged to increase the cavity volume and the number of heat dissipation holes. The heat dissipation holes and cavities of the first wheel group and the second wheel group form opposite heat flow conduction, accelerate the gas flow in the internal cavity, and further improve the heat dissipation efficiency.

[0062] Embodiment 3

[0063] On the basis of the second embodiment, a push rod mechanism 2 is arranged in the cavity, see Fig. 9 , Fig.10 The push rod mechanism includes a push rod 21, a rack is provided at the root of the push rod, and the push rod 21 extends into the cavity 11 through the first heat dissipation hole 12; the push rod mechanism is also provided with a driving gear 22 that cooperates with the rack, and a driving device 23 that drives the gear.

[0064] In this embodiment, due to the design of the synchronous belt pulley, when the synchronous belt is running at high speed, the middle area of ​​the synchronous belt will be easily stuck in the ring groove, and the two sides of the synchronous belt will be slightly tilted, which will not have an impact during normal operation. However, when the synchronous belt is disassembled, especially when the master and slave synchronous belt pulleys are not disassembled and the synchronous belt pulleys are easy to rotate, the synchronous belt is difficult to pull out from the synchronous belt pulley. In view of this, a mechanism that is easy to disassemble the synchronous belt is designed by utilizing the internal space of the cavity and the first heat dissipation hole. During disassembly, the mechanism can be used to use the cooperation of the gear and the ejector rod to eject the synchronous belt. After ejection, the ejector rod is stuck and the synchronous belt is pulled out using an auxiliary tool to achieve the disassembly of the synchronous belt.

[0065] It should be noted that the driving device 23 in the figure of this case can be a combination of a micro-drive motor and a micro-control board to realize the above-mentioned driving function. However, the inner cavity 11 still needs to have a certain amount of surplus space to assemble the above-mentioned structure; it should be noted that the ejector mechanism proposed in this case is to facilitate the ejection of the synchronous belt, and the size of the synchronous pulley is not limited. It can be understood that if the synchronous pulley is small, it means that the synchronous pulley is easy to pull out, so this embodiment actually deals with large synchronous pulleys. At the same time, it should be noted that for the convenience of explanation, this embodiment only draws one ejector mechanism in the figure, and in order to adapt to different scenarios, multiple ejector mechanisms can be set in the cavity, and this embodiment does not limit it.

[0066] Embodiment 4

[0067] On the basis of the second embodiment, the synchronous pulley is arranged in the transmission mechanism, see Fig.11 , Fig.12 The transmission mechanism includes: a synchronous belt 32, a driving synchronous pulley 31, a driven synchronous pulley 33, a driving shaft 34 and a driven shaft 35;

[0068] The driving synchronous pulley 31 and the driven synchronous pulley 33 are a self-heat dissipating synchronous pulley 1 in one embodiment; the synchronous belt 32 is provided with convex teeth and one side thereof is provided with a protrusion 321 which fits with the annular groove 17 .

[0069] In the above technical solution, a transmission mechanism is established based on a self-heat dissipating synchronous pulley. Thanks to the self-heat dissipating effect of the synchronous pulley, the synchronous pulley can withstand a faster transmission speed, thereby improving the transmission efficiency of the transmission mechanism. At the same time, due to the ring groove design of the self-heat dissipating synchronous pulley, a protrusion is further designed on the synchronous belt, so that the entire transmission mechanism will not cause the synchronous belt to deviate under the cooperation of the ring groove and the protrusion.

[0070] Embodiment 5

[0071] Based on the fourth embodiment, the transmission mechanism further comprises: a tensioning mechanism;

[0072] See also Fig.13 , Fig.14 The tensioning mechanism includes: a driving gear 41, a rack plate 42 and a driven gear 43; the two sides of the rack plate 42 are meshed with the driving gear 41 and the driven gear 43 respectively; the rack plate 42 is connected with a rotating shaft 45, and the rotating shaft 45 is rotatably connected with a tensioning wheel 44, and the surface of the tensioning wheel 44 is provided with a connecting groove that matches the protrusion 321 and abuts against the protrusion 321 of the synchronous belt. It should be noted that in order to better understand the tensioning mechanism and its tensioning principle, the corresponding tensioning mechanism frame, fixed seat, etc. are not drawn in the figure. These parts can be regarded as existing technologies and are set according to actual needs. This embodiment does not limit them.

[0073] In the above technical solution, a tensioning mechanism is established based on a self-heat dissipating synchronous belt pulley. Thanks to the annular groove of the synchronous belt pulley, a protruding part is designed on the synchronous belt so that the entire transmission mechanism will not cause the synchronous belt to deviate under the cooperation of the annular groove and the protruding part. On this basis, the tensioning mechanism is designed using the protruding part of the synchronous belt. Traditional tensioning mechanisms mostly adopt an additional synchronous belt pulley as a tensioning wheel set in the mechanism. The disadvantage of such a setting is that an additional synchronous belt pulley and an additional heat accumulation will affect the life of the synchronous belt, and will also generate noise and vibration accordingly. In this case, thanks to the annular groove design of the self-heat dissipating synchronous belt pulley and the protruding part of the synchronous belt, only a tensioning wheel that matches the protruding part needs to be designed to press the main synchronous belt to achieve the tensioning effect. At the same time, since the tensioning wheel does not need to mesh with the synchronous belt, it will not generate heat accumulation and vibration. Furthermore, although such a setting will increase the stress in the center of the synchronous belt, due to the setting of the protruding part, the synchronous belt will not cause excessive loss.

[0074] Embodiment 6

[0075] Based on the above embodiments, an embodiment of a method for using a self-heating synchronous pulley is provided. A self-heating synchronous pulley based on the second embodiment includes:

[0076] The driving shaft is installed in the square mounting hole of the driving synchronous pulley, and the driven shaft is installed in the square mounting hole of the driven synchronous pulley;

[0077] The protruding part of the synchronous belt is clamped into the annular grooves of the driving synchronous belt pulley and the driven synchronous belt pulley, and the teeth of the synchronous belt are meshed with the driving synchronous belt pulley and the driven synchronous belt pulley;

[0078] The groove of the tension wheel is brought into contact with the protrusion of the synchronous belt, and the driving gear is rotated to drive the rack plate and the driven gear to rotate to adjust the tension of the synchronous belt;

[0079] When removing the synchronous belt, first release the tension, adjust the driving gear to push the push rod out of the first heat dissipation hole, and rotate the active synchronous belt wheel to drive the meshing teeth and the protrusion to gradually come out of the synchronous belt wheel.

[0080] In the above technical solution, the first heat dissipation hole, the second heat dissipation hole and the cavity are respectively set on the synchronous pulley to solve the problem of the edge position of the synchronous pulley being too high. When the traditional synchronous pulley is engaged with the synchronous belt, friction generates heat. This part of the heat cannot be quickly discharged, resulting in heat accumulation, and the first heat dissipation hole is used to use the airflow generated when the synchronous pulley is engaged with the synchronous belt to quickly bring the heat into the cavity inside the synchronous pulley, thereby alleviating the heat accumulation at the edge; the second heat dissipation hole and the cavity are used to solve the heat accumulation at the connection between the synchronous pulley and the rotating shaft. The heat at the meshing point of the synchronous pulley enters the cavity through the first heat dissipation hole, and the heat accumulated at the connection between the synchronous pulley and the rotating shaft will also flow into the cavity due to heat conduction. The heat at both positions is balanced through the cavity so that the overall temperature of the synchronous pulley is in a relatively balanced state. It can be seen from the air pressure formula that the temperature rises and the pressure decreases. Since the synchronous pulley will gradually heat up during operation, the air pressure inside the cavity will gradually decrease. In order to further solve the problem of heat dissipation, a second heat dissipation hole is set. According to the airflow conduction method, the airflow flows from high pressure to low pressure. Setting the second heat dissipation hole helps to draw the external low-temperature airflow into the cavity and reduce the temperature inside the cavity. If the second heat dissipation hole is not set, the airflow will be introduced into the cavity through the first heat dissipation hole, and the problem of internal heat accumulation cannot be solved. In order to further balance the cooling inside the cavity, the second heat dissipation hole is further set around the axis of the synchronous pulley, so that the whole is in a more balanced state. At the same time, if the second heat dissipation hole is opened at will, it will cause the center of gravity to shift when the synchronous pulley rotates, resulting in polarization.

[0081] The transmission mechanism is established based on the self-heating synchronous pulley. Thanks to the self-heating effect of the synchronous pulley, the synchronous pulley can withstand a faster transmission speed, thereby improving the transmission efficiency of the transmission mechanism. At the same time, due to the ring groove design of the self-heating synchronous pulley, a protrusion is further designed on the synchronous belt, so that the entire transmission mechanism will not cause the synchronous belt to deviate under the cooperation of the ring groove and the protrusion.

[0082] Based on the self-heat dissipation synchronous belt pulley, a tensioning mechanism is established. Thanks to the annular groove of the synchronous belt pulley, the protrusion of the synchronous belt is designed so that the entire transmission mechanism will not cause the synchronous belt to deviate under the cooperation of the annular groove and the protrusion. On this basis, the tensioning mechanism is designed using the protrusion of the synchronous belt. Traditional tensioning mechanisms are mostly set up by adding a synchronous belt pulley as a tensioning wheel in the mechanism. The disadvantage of such a setting is that one more synchronous belt pulley and one more part of accumulated heat will affect the life of the synchronous belt, and will also generate noise and vibration accordingly. In this case, thanks to the annular groove design of the self-heat dissipation synchronous belt pulley and the protrusion of the synchronous belt, only a tensioning wheel that matches the protrusion needs to be designed to press the main synchronous belt to achieve the tensioning effect. At the same time, since the tensioning wheel does not need to mesh with the synchronous belt, it will not generate heat accumulation and vibration. Furthermore, although such a setting will increase the stress in the center of the synchronous belt, due to the setting of the protrusion, the synchronous belt will not cause excessive loss.

[0083] Due to the design of the synchronous belt pulley in this case, when the synchronous belt is running at high speed, the middle area of ​​the synchronous belt will be easily stuck in the ring groove, and the two sides of the synchronous belt will be slightly tilted, which will not have an impact during normal operation. However, when the synchronous belt is disassembled, especially when the master and slave synchronous belt pulleys are not disassembled and the synchronous belt pulleys are easy to rotate, the synchronous belt is difficult to pull out from the synchronous belt pulley. In view of this, a mechanism that is easy to disassemble the synchronous belt is designed by utilizing the internal space of the cavity and the first heat dissipation hole. During disassembly, the mechanism can use the cooperation of the gear and the ejector rod to eject the synchronous belt. After ejection, the ejector rod is stuck and the synchronous belt is pulled out using an auxiliary tool to achieve the disassembly of the synchronous belt.

[0084] The above descriptions are only some embodiments of the present invention, and do not limit the protection scope of the present invention. Any equivalent device or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A self-heating synchronous pulley, characterized in that: A plurality of gear teeth are arranged on the surface of the synchronous belt pulley; a cavity is arranged inside the synchronous belt pulley, and a first heat dissipation hole is arranged between the gear teeth and penetrates the cavity along a first direction; a plurality of second heat dissipation holes are arranged on the side of the synchronous belt pulley and penetrate the cavity along a second direction, and the second heat dissipation holes are arranged around the axis of the synchronous belt pulley; the mounting hole of the synchronous belt pulley is a square mounting hole.

2. A self-heating synchronous pulley according to claim 1, characterized in that: The synchronous pulley comprises a first wheel group and a second wheel group, wherein the surfaces of the first wheel group and the second wheel group are both provided with a plurality of gear teeth; an annular groove is provided between the first wheel group and the second wheel group; a first cavity is provided inside the first wheel group, and a second cavity is provided inside the second wheel group.

3. A self-heating synchronous pulley as claimed in claim 1, characterized in that: The cross-sectional shape of the first heat dissipation hole can be square or circular.

4. A self-heating synchronous pulley as claimed in claim 3, characterized in that: The cross-sectional shape of the first heat dissipation hole is square, and a guide groove is respectively provided on the four walls of the first heat dissipation hole; the guide groove is sequentially provided with a first guide section, a second guide section and a third guide section along the direction from the surface of the synchronous pulley to the cavity, and the width ratio of the first guide section, the second guide section and the third guide section is 1:0.653:0.

237.

5. A self-heating synchronous pulley as claimed in claim 3, characterized in that: The cross-sectional shape of the first heat dissipation hole is circular, and a spiral groove is provided on the wall of the first heat dissipation hole; the spiral groove is provided with a first spiral segment, a second spiral segment and a third spiral segment in sequence along the surface of the synchronous pulley to the cavity, and the pitch ratio of the first spiral segment, the second spiral segment and the third spiral segment is 1:0.511:0.

331.

6. A self-heating synchronous pulley as claimed in claim 1, characterized in that: The cavity includes a bottom surface, on which a plurality of guide ribs are arranged around the axis of the synchronous pulley, and the intervals formed between the guide ribs are directly opposite to the first heat dissipation holes; the guide ribs are distributed in three sections along the length direction, with a height ratio of 0.213:1:0.

213.

7. A self-heating synchronous pulley as claimed in claim 1, characterized in that: A push rod mechanism is arranged in the cavity; The push rod mechanism includes a push rod, a rack is arranged at the root of the push rod, and the push rod extends into the cavity through the first heat dissipation hole; the push rod mechanism is also provided with a driving gear matched with the rack, and a driving device for driving the gear.

8. A self-heating synchronous pulley as claimed in claim 2, characterized in that: The synchronous pulley is arranged on the transmission mechanism, and the transmission mechanism comprises: a synchronous belt, a driving synchronous pulley, a driven synchronous pulley, a driving shaft and a driven shaft; The driving synchronous pulley and the driven synchronous pulley are a self-heating synchronous pulley as described in claim 2; the synchronous belt is provided with a protrusion on one side of the convex teeth that fits with the annular groove.

9. A self-heating synchronous pulley as claimed in claim 8, characterized in that: The transmission mechanism further comprises: a tensioning mechanism; The tensioning mechanism includes: a driving gear, a rack plate and a driven gear; the two sides of the rack plate are respectively meshed with the driving gear and the driven gear; a rotating shaft is connected to the rack plate, and the rotating shaft is rotatably connected to a tensioning wheel, and a connecting groove that matches the protrusion is provided on the surface of the tensioning wheel, and abuts against the protrusion of the synchronous belt.

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