JP5375237B2 - Rotating arm with heat dissipation device and horizontal articulated robot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turning arm with a heat radiation device capable of efficiently radiating heat generated from a heating element such as a motor even if a thermal conduction path is elongated, and to provide a horizontal articulated robot with the turning arm. <P>SOLUTION: A second arm 15 that is horizontally turned around a support shaft 14 includes: a heat absorbing part 36 thermally coupled with a second motor M2 installed thereon; and a heat radiation part 31 that radiates absorbed heat to the outside of the second arm 15 through a heat pipe 35 thermally coupled with the heat absorbing part 36. The heat radiation part 31 is set farther apart than the second motor M2 from the support shaft 14 and radiates heat transmitted from the heat absorbing part 36 by a formed airflow while forming the airflow around it based on air received from the turning direction of the second arm 15. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a swivel arm with a heat radiating device that is employed in an industrial machine or the like including an arm that is swung and has a function of radiating heat transmitted from a heating element, and a horizontal articulated robot including the arm. .

  As the industrial machine, especially an industrial robot, a robot in which a plurality of arms are connected in a turnable manner such as a vertical articulated robot and a horizontal articulated robot (SCARA robot) is often used. These robots move their arms with respect to the base by turning movement based on changing the arm to an appropriate angle with respect to the support part such as another arm supported via the connecting part. Relative movement.

  On the other hand, in recent years, in order to meet the demand for productivity improvement by such robots, it has been demanded that the performance of the robot itself can be increased in speed and reduced in non-operating time. Therefore, the arm is moved frequently by increasing the motor rotation speed to increase the arm turning speed, or increasing the motor operation time per unit time to shorten the non-operation time. Ingenuity such as making it is being attempted.

  However, as a matter of fact, an increase in the rotational speed of the motor leads to an increase in the amount of heat generated by the motor, and an increase in the operating time of the motor causes an increase in the amount of heat generated per unit time and a shortening of the cooling time. It also causes inconvenience. That is, the motor temperature rises rapidly, and the temperature rise exceeds the natural cooling capacity, so that it exceeds the predetermined temperature range that is predetermined to maintain the performance and life of the motor. It becomes easy. And when it exceeds the predetermined temperature range in this way, it is not preferable to continue driving the motor as it is, so it is necessary to lower the temperature, eventually reducing the rotational speed or extending the stop time Thus, the operation performance of the motor, and thus the turning speed of the arm and the number of movements are restricted.

  Therefore, conventionally, various structures for efficiently radiating the heat generated by the motor in order to suppress the temperature rise of the motor have been proposed. As an example of such a structure, for example, in an industrial robot described in Patent Document 1 There are cooling methods for the drive motor. In the motor cooling method described in Patent Document 1, a motor is attached to a robot body having thermal conductivity through a flange, and a plate protruding from a cover separately attached to the robot body is provided on the outer surface of the motor. Is brought into contact with each other through heat conductive grease. As a result, the heat generated from the motor forms two heat transfer paths: a heat transfer path that reaches the robot body via the flange and a heat transfer path that reaches the robot body via the plate and cover. The heat dissipation capability, that is, the cooling capability is naturally increased.

JP-A-9-323286

By the way, the arm on which equipment such as a motor is usually installed includes an arm housing formed of a metal material having high thermal conductivity for the purpose of maintaining the rigidity of the arm, and the above equipment installed on the arm housing. In many cases, the arm cover is formed of a lightweight resin that covers the cover. In many cases, the arm has a configuration in which the motor projects from the surface of the arm housing via a flange. In such a configuration, the outer surface of the motor is separated from the arm housing. It becomes such a structure. Furthermore, when the arm cover covering the motor is made of a resin having low thermal conductivity, heat radiation through the cover cannot be expected.

  For this reason, even if a heat transfer path composed of a plate and a cover is provided separately from the heat transfer path by the flange as in the motor cooling method described in Patent Document 1, the cover itself has a thermal conductivity. When it is made of low resin or has a structure in which the outer surface of the motor is separated from the arm housing, it is difficult to efficiently secure the heat transfer path. In addition, in such a structure, even if another heat transfer path can be provided, in general, the connection of the heat transfer path is increased even if the distance is increased or the path is shortened. It is not easy to secure a heat transfer path with good heat dissipation efficiency, for example, the tip must be in the vicinity of a flange that tends to be hot.

  The present invention has been made to solve the above-described problems, and the purpose thereof is to efficiently dissipate heat generated from a heating element such as a motor even if the heat transfer path is extended. It is an object to provide a swivel arm with a heat dissipating device having a heat dissipating device and a horizontal articulated robot including the swivel arm.

A swivel arm with a heat dissipation device according to the present invention is installed on an arm that revolves horizontally around a rotation axis, and is thermally coupled to a heating element that pivots the arm through rotational driving of the rotation axis, and the heating element. A heat-absorbing part; and a heat-dissipating part that dissipates the heat absorbed by the heat-absorbing part to the outside of the arm via a heat transfer device thermally coupled to the heat-absorbing part. An airflow is formed around the arm based on the air received from the turning direction of the arm, which is disposed at a position farther from the heating element and swivels by the rotational drive of the rotary shaft by the heating element. The gist is to radiate the heat transmitted from the heat absorbing portion.

  According to such a structure, the heat of the heat generating element is absorbed by the heat absorbing portion of the heat radiating device and then moved to the heat radiating portion farther from the rotating shaft than the heat generating member by the heat transfer device, and the arm is swung. When the heat radiating part is exposed to the strong airflow formed, heat is radiated from the heat radiating part to the outside of the arm. As a result, the heat dissipating efficiency of the heating element provided on the arm is increased, and the temperature rise of the heating element is reduced, and the function of the heating element may be restricted by the temperature rise. Is reduced. For example, if the heating element is a motor that drives the arm to rotate, the motor will not easily exceed a predetermined temperature range that is set in advance to maintain the performance and life of the motor by reducing the temperature rise. Operation restrictions such as rotation speed and operating time restrictions that occur when the range is exceeded are less likely to occur. That is, by adopting such a heat radiating device for the motor, it is possible to speed up the operation of the swivel arm and shorten the non-operating time.

  In addition, since the heat radiating portion is provided at a position away from the rotating shaft, it receives a strong air flow during the turning movement, and the cooling capacity is improved as the amount of air in contact with the unit time is increased. . Furthermore, since the heat radiating part is also arranged at a position away from the heating element, it is also arranged at a position where the heat from the heating element is not transmitted so much, the larger the temperature difference around Efficient heat dissipation is also performed from the heat dissipating part in which the heat dissipation efficiency is improved. This also increases the cooling capacity (heat dissipation efficiency) of the heating element.

Furthermore, since the heat absorption part and the heat dissipation part are separated from each other, the degree of freedom of arrangement of the heat absorption part and the heat dissipation part in the arm is increased. It is possible to secure a space for disposing the heat dissipating device while maintaining the degree of freedom in disposing the devices.

  In this swivel-type arm with a heat dissipation device, the heat dissipating part is arranged in such a manner that a base part supporting the heat dissipating part is along the outer surface of the arm, and the base part is provided in the outward direction along the outer surface of the arm. The gist of the present invention is that a plurality of protrusions extending in a wall shape are provided.

  According to such a structure, the contact area of the heat dissipating part with the air is increased, the heat dissipating efficiency through the heat dissipating part is increased, and the temperature rise of the heating element such as the motor is reduced. It becomes like this.

  In this swivel arm with a heat dissipation device, a space formed between one of the plurality of protrusions and another protrusion adjacent to the one protrusion is in the swivel direction of the arm. The gist is that the heat dissipating part is arranged on the base part of the heat dissipating part.

  According to such a structure, when the arm is swung, the air flow generated around the arm along with the swiveling movement also flows into the spaces between the protrusions of the heat radiating section and the protrusions. It comes to circulate through space. As a result, a large amount of air flows through the side surfaces of the protrusions of the heat radiating part, and the amount of air that the side surfaces of the protrusions touch in a unit time increases, so that the heat dissipation efficiency of the heat radiating part is enhanced. Thus, the cooling performance of a heating element such as a motor that is dissipated from the heat radiating portion is improved, and the temperature rise of the heating element is more appropriately reduced.

The gist of this swivel arm with a heat radiating device is that a plurality of notches are formed in the plurality of protrusions in such a manner as to intersect the protrusions.
According to such a structure, a plurality of notches are formed in the protrusion of the heat radiating section so as to cross the protrusion, and air is circulated between them. This also increases the contact area between the protrusions of the heat dissipating part and the air on the side surfaces, and increases the amount of air flow, thereby more efficiently dissipating heat from the heat dissipating part. As a result, the temperature rise of a heating element such as a motor is more suitably reduced.

The gist of the swivel arm with a heat dissipation device is that the heat transfer device is a heat pipe.
According to such a structure, the heat accommodated in the heat absorbing part is quickly moved to the heat radiating part by the heat pipe having high heat transfer performance, and the heat radiating ability of the heat radiating part can be fully utilized. As this happens, the cooling capacity of the heat absorbing portion with respect to the heating element is further improved. As a result, the heat dissipation efficiency of the heating element such as a motor can be increased, the temperature rise of the heating element is reduced, and inconveniences such as operation restrictions caused by the temperature rise are avoided.

  In addition, the heat pipe can select the path between the heat absorbing part and the heat radiating part with a high degree of freedom while maintaining its high heat transfer performance, and the degree of freedom of the arrangement of the heat absorbing part and the heat radiating part in the arm is higher. Be able to.

  In this swivel type arm with a heat dissipation device, the heat dissipating part is provided above the heat absorbing part in the arm, and the heat pipe has a height difference between the heat dissipating part and the heat absorbing part. The gist is to be provided.

According to such a structure, the heat transfer material radiated and liquefied at the end portion of the heat pipe on the heat radiating portion side is returned to the heat absorbing portion by gravity. Generally, in a heat pipe, a capillary tube is connected to a heat absorbing end (an end on the heat absorbing portion side) where a working fluid radiated and liquefied at a heat radiating end (an end on the heat radiating portion side) is provided at a position lower than the heat radiating end. Although it is recirculated by the phenomenon, in addition to that, by ensuring the flow by gravity, the recirculation is performed more rapidly to the endothermic end of the hydraulic fluid. The rapid recirculation of the hydraulic fluid to the heat absorbing portion improves the heat transfer capability of the heat pipe, so that the cooling capability of the heating element is further improved and the temperature rise of the heating element is suitably suppressed.

  The horizontal articulated robot of the present invention is a horizontal articulated robot in which a plurality of arms are horizontally connected via a rotation axis, and at least one of the plurality of arms is connected to the heat dissipation device described above. The gist is that it is a swivel-type arm.

  According to such a structure, the heat of the heating element is absorbed by the heat absorbing portion of the heat dissipation device and then moved to the heat dissipation portion that is farther from the rotating shaft than the heating element by the heat transfer device, and the robot arm turns. When the heat radiating part is exposed to a strong airflow formed with the movement, heat is radiated from the heat radiating part to the outside of the arm. As a result, the heat dissipating efficiency of the heating element provided on the arm is increased, and the temperature rise of the heating element is reduced, and the function of the heating element may be restricted by the temperature rise. Is reduced. For example, if the heating element is a motor that drives the arm to rotate, the motor will not easily exceed a predetermined temperature range that is set in advance to maintain the performance and life of the motor by reducing the temperature rise. Operation restrictions such as rotation speed and operating time restrictions that occur when the range is exceeded are less likely to occur. In other words, a robot that employs a swivel arm having such a heat dissipation device in the motor can increase the speed of its operation and shorten the non-operating time.

  In addition, since the heat radiating portion is provided at a position away from the rotating shaft, it receives a strong air flow during the turning movement, and the cooling capacity is improved as the amount of air in contact with the unit time is increased. . Furthermore, since the heat radiating part is also arranged at a position away from the heating element, it is also arranged at a position where the heat from the heating element is not transmitted so much, the larger the temperature difference around Efficient heat dissipation is also performed from the heat dissipating part in which the heat dissipation efficiency is improved. This also increases the cooling capacity (heat dissipation efficiency) of the heating element.

  Furthermore, since the heat absorption part and the heat dissipation part are separated from each other, the degree of freedom of arrangement of the heat absorption part and the heat dissipation part in the robot arm is increased, and an arm whose arrangement of various devices is densified by downsizing is adopted. Even if the robot is a robot, it is possible to secure a space for disposing the heat dissipation device while maintaining the degree of freedom of arrangement of the devices in the robot arm.

The front view which shows the front structure of the one embodiment about the horizontal articulated robot with which the turning type arm with a heat radiating device concerning this invention is employ | adopted. The top view which shows the one part upper surface structure of the thermal radiation apparatus used in the embodiment. The front view which shows the front structure of the thermal radiation apparatus used in the embodiment. Sectional drawing which shows the cross-section in the 4-4 line | wire of FIG. 3 about the heat absorption part of the thermal radiation apparatus used in the embodiment. The graph which shows the time change of the temperature of the arm drive motor used in the embodiment. (A) (b) is a schematic diagram which shows a different aspect about the thermal radiation apparatus used for other embodiment. Moreover, the schematic diagram which shows the aspect about the thermal radiation part of the thermal radiation apparatus used for other embodiment. Furthermore, the front view which shows the front structure of the thermal radiation apparatus used for other embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a horizontal articulated robot using a swivel arm with a heat dissipation device according to the present invention is described below with reference to the drawings.
As shown in FIG. 1, the robot has a base 11 installed on a floor surface or the like, and a base end of a first arm 13 on a base shaft 12 rotatably provided at an upper end thereof. Is fixedly connected. The base shaft 12 is rotated forward and backward by a first motor M1 provided in the base 11 so that the base shaft 12 rotates about the axis C1 with respect to the base 11. It has become. Accordingly, the first arm 13 rotates in the horizontal direction with respect to the base 11 around the axis C <b> 1 of the base shaft 12, that is, horizontally swings.

  The support shaft 14 provided at the distal end portion of the first arm 13 supports the second arm 15 in a rotatable manner by disposing the distal end thereof within the proximal end portion of the second arm 15. The second arm 15 includes an arm housing 20 formed of a metal material or the like in a horizontally long arm shape having high rigidity, and a second motor M2 or the like extending from the base end portion to the distal end portion of the upper side of the arm housing 20. It is comprised from the lightweight arm cover 21 formed from a resin material as a cover to include.

  A second motor M2 is fixed to the base end of the arm housing 20 of the second arm 15, and the output shaft of the second motor M2 is connected to the tip of the support shaft 14 via a gear or the like. ing. As a result, the arm housing 20 is centered on the axis C2 by the reaction force received by the second motor M2 from the support shaft 14 when the support shaft 14 rotates forward and backward by the rotation of the second motor M2. It rotates in the horizontal direction with respect to the first arm 13. That is, the second arm 15 having the arm housing 20 is turned horizontally.

  At the distal end of the second arm 15, a vertical rotation shaft 16 that penetrates the arm housing 20 and the arm cover 21 of the second arm 15 is provided. The vertical rotation shaft 16 is a cylindrical shaft body, and a ball screw groove and a spline groove (not shown) are formed on the circumferential surface thereof. The vertical rotation shaft 16 is inserted so that the spline groove is fitted to the center of the spline nut 16 </ b> S disposed at the tip of the second arm 15, and the ball screw groove is also inserted into the tip of the second arm 15. It is inserted so as to be screwed into the center of the ball screw nut 16B disposed in the section. Thus, the vertical rotation shaft 16 is supported so as to be rotatable with respect to the second arm 15 and movable in the vertical direction. That is, the vertical rotation shaft 16 is rotated forward and backward about its own axis C3 by forward and reverse rotation of the rotation motor M3 provided in the second arm 15 by rotating the spline nut 16S forward and backward. The vertical rotation shaft 16 is moved up and down in the vertical direction by forward / reverse rotation of the lifting / lowering motor M4 provided in the second arm 15 by rotating the ball screw nut 16B forward and backward. 17 is moved up and down. A tool, for example, a hand for gripping a workpiece or a hand for processing a workpiece can be attached to the lower end portion 17 of the vertical rotation shaft 16. The robot transports parts and processes parts by using each tool attached to the lower end portion 17.

  The signal lines for the control signals or monitor signals of the motors M2 to M4 provided in the second arm 15 are gathered in the base 11 via the flexible wiring duct 19, and the first motor Along with the signal line M1, it is connected to each corresponding terminal of a control device (not shown).

  Further, the second arm 15 is provided with a heat radiating device 30, and an arm cover in which the heat radiating portion 31 constituting the heat radiating device 30 is separated from the axis C2 by the distance L2 from the axis C2 in the second arm 15. 21 is provided on the upper surface of the outer surfaces.

  Next, the heat dissipation device 30 provided on the second arm 15 will be described with reference to FIGS. 2 is a diagram showing a structure of a part of the heat radiating device 30 viewed from above the robot, and FIG. 3 is a diagram showing a structure of the entire heat radiating device 30 viewed from the front of the robot. These are figures which show the structure of the cross section in the 4-4 line | wire of FIG.

  As shown in FIGS. 2 and 3, the heat dissipation device 30 is mechanically and thermally coupled to the heat dissipation portion 31 disposed on the top surface of the distal end portion of the arm cover 21 of the second arm 15 and the second motor M2. And a heat pipe 35 serving as a heat transfer device coupled to the heat radiating unit 31 and the heat absorbing unit 36 to transmit the heat of the heat absorbing unit 36 to the heat radiating unit 31.

  As shown in FIGS. 3 and 4, the heat pipe 35 is formed in a tube shape sealed at both ends, and a plurality of pleats continuous in the length direction of the tube are formed on the tube-shaped inner wall 35i. ing. The heat pipe 35 has a predetermined plasticity, and can be disposed in the second arm 15 with an arbitrary curvature if the curvature is larger than a predetermined curvature. Inside the heat pipe 35, a working fluid (not shown) that is liquefied by cooling and vaporized by heating is enclosed. When the hydraulic fluid is liquid, it accumulates at the heat absorbing end located relatively below the heat pipe 35, and when the heat absorbing end is vaporized by heating and becomes a gas, it moves to the heat radiating end positioned relatively above. Then, the gas is cooled again at the heat radiating end to be liquefied again to become liquid, and is returned to the heat absorbing end by capillary action due to gravity and pleats. That is, the heat pipe 35 takes away the heat around the heat absorption end by the heat of vaporization when the working fluid is vaporized, and supplies the heat around the heat dissipation end by the heat of liquefaction when the hydraulic fluid is liquefied. Then, it is continuously performed by repeating the vaporization and liquefaction of the hydraulic fluid as described above, and the heat at the end of heat absorption is transferred to the heat dissipation end with high efficiency.

  The heat absorbing portion 36 is formed in a block shape from a metal material having high thermal conductivity such as aluminum, and one side surface thereof is mechanically and thermally connected to the side surface of the second motor M2 via the thermal conductive sheet 37. Are combined. That is, the heat absorption part 36 is supported on the side surface of the second motor M2, and heat generated by the second motor M2 is efficiently and smoothly transmitted. A pipe attachment groove 36g is recessed in one side of the heat absorption part 36, and the heat absorption end of the heat pipe 35 is inserted into the pipe attachment groove 36g via a heat conductive sheet (not shown). And are connected so that high thermal conductivity is maintained. As a result, the endothermic part 36 heated by the heat of the second motor M2 heats the endothermic end of the heat pipe 35, and by this heating, heat of vaporization due to vaporization of the working fluid is generated at the endothermic end, and the same heat of vaporization is absorbed by the endothermic part. The heat of the heat absorption part 36 is reduced by taking the heat of 36, and the movement of the heat of the second motor M2 to the heat absorption part 36 is promoted.

  In the present embodiment, the heat pipe 35 disposed in the pipe mounting groove 36g has a part of the outer peripheral surface 35f thermally coupled to the pipe mounting groove 36g, and the outer periphery facing the open portion of the pipe mounting groove 36g. The surface 35f is thermally coupled to the second motor M2 via a thermally conductive sheet 37 disposed between the surface 35f and the second motor M2. This facilitates the arrangement of the heat pipe 35 in the pipe mounting groove 36g, ensures the adhesion with the pipe mounting groove 36g by the elasticity of the heat conductive sheet 37, the heat absorbing portion 36 and the heat conductive sheet. The outer peripheral surface 35f that is not in thermal contact with 37 is reduced so that efficient heat conduction to the heat absorbing portion of the heat pipe 35 is performed.

The heat dissipating part 31 is a so-called heat sink formed from a metal material having high heat conductivity such as aluminum in order to improve heat dissipating efficiency. The heat dissipating part 31 protrudes from the plate-like base part 32 and the surface of the base part 32. And a plurality of radiating fins 33 as protrusions. The base portion 32 is fitted into the through hole of the arm cover 21 so that the entire heat radiating portion 31 is supported by the arm cover 21, and the lower portion thereof passes through the through hole and enters the arm cover 21. It is designed to protrude. A pipe mounting groove 32a is horizontally formed in the lower part of the base part 32, and a heat radiating part of the heat pipe 35 is provided in the pipe mounting groove 32a through a heat conductive sheet (not shown). The base part 32 is coupled so as to maintain high thermal conductivity. As a result, the heat radiating section 31 cools the heat radiating end of the heat pipe 35, and by the cooling, the hydraulic fluid is liquefied at the heat radiating end to generate liquefaction heat, and the liquefied heat is transmitted to the heat radiating section 31, The heat is radiated through the radiating fins 33. In addition, since the heat pipe 35 has a relatively high portion as a heat radiating end and a relatively low portion as a heat absorbing end, the pipe mounting groove 32a of the heat radiating portion 31 is relatively more than the pipe mounting groove 36g of the heat absorbing portion 36. It is arranged at a high position.

  The heat radiating fins 33 are for increasing the surface area of the heat radiating portion 31 and improving the heat radiating efficiency into the air, and the turning direction of the second arm 15 (arrow A and arrow on the upper surface of the base portion 32). It is formed to project in a wall shape extending in the direction B). The plurality of radiating fins 33 each have a space 34 through which air flows between each of the radiating fins 33, and the air circulated through the space 34 and the radiating fins 33 disposed on both sides thereof. The heat exchange between them is promoted, and the heat radiation from the radiation fins 33 is promoted. Thereby, the thermal radiation part 31 can thermally radiate the heat | fever accumulate | stored there there in the air efficiently.

  From this, as shown in FIG. 2, for example, when the tip of the second arm 15 is turned in the right direction (the direction of the arrow A), the heat dissipating section 31 moves left (white) An air flow in the direction of the hollow arrow a) is generated, and the air from the right to the left (the direction of the hollow arrow a) is forced to flow in each space 34. On the other hand, for example, when the tip of the second arm 15 is turned leftward (in the direction of arrow B), the heat radiating portion 31 moves to the respective radiating fin 33 in the right direction (in the direction of the white arrow b). By generating an air flow, air is forced to flow through each space 34 from the left to the right (in the direction of the white arrow b).

  Usually, the heat radiation amount of the radiation fins 33 is increased as the amount of air flowing on the surface, that is, the space 34 is increased. In addition, the second arm 15 that is swung is moved so that the moving speed in the swiveling direction increases as the distance from the axis C2 increases, and the moving speed of the tip of the second arm 15 is faster than that of the base end. The amount of air received per unit time increases. Therefore, in this embodiment, by disposing the heat radiating portion 31 at a position separated from the axis C2 of the support shaft 14 by the distance L2, the heat radiating efficiency of the heat radiating portion 31 is improved by the turning movement of the second arm 15 itself. I try to do it. That is, in the heat radiating part 31 that is separated from the axis C2 by the distance L2, the moving speed in the turning direction based on the rotation speed of the axis C2 that turns the second arm 15 and the distance L2 from the axis C2. An airflow corresponding to the airflow is generated, and a lot of air based on the airflow is circulated through the heat radiating fins 33 (spaces 34) of the heat radiating portion 31.

  Thus, even when heat from the heat absorbing portion 36 is transmitted to the heat radiating portion 31, the transmitted heat is radiated from the heat radiating portion 31 with high heat radiating efficiency due to the turning movement of the second arm 15 itself. become.

  Next, the heat dissipation effect of the second arm 15 by the heat dissipation device 30 will be described with reference to FIG. FIG. 5 is a graph showing the time change of the temperature of the base end portion of the second arm 15 when the second motor M2 is driven in a predetermined pattern.

The second motor M2 driven in a predetermined pattern generates heat every time it is driven, and the heat is applied to the base end of the arm housing 20 of the second arm 15 and the surrounding air as shown in FIG. Transmitted to raise their temperature. The arm housing 20 made of a metal member has a thermal conductivity and is rarely designed in consideration of the heat radiation efficiency, and usually the heat naturally radiated from there is little. The second motor M2 has an arm cover 2 made of a resin material having a low thermal conductivity.
Since it is covered with 1, heat release to the air cannot be expected so much. Usually, in such a case, the temperature of the base end portion of the second arm 15 (arm housing 20) increases with time as shown in the graph T1.

  Therefore, when the heat radiating device 30 is provided on the second arm 15 as in this embodiment, the heat of the second motor M2 is directly radiated from the heat radiating device 30 without passing through the arm housing 20 or the like. Therefore, the temperature rise of the second arm 15 is reduced, and for example, as shown in the graph T2, the temperature is maintained lower than that shown in the graph T1 even if time elapses.

  As described above, the heat dissipating part 31 is installed at a position where the heat dissipating efficiency is high, the heat of the second motor M2 is moved to the heat absorbing part 36 with high efficiency, and the heat of the heat absorbing part 36 by the heat pipe 35 is efficiently transferred to the heat dissipating part 31. The heat dissipating device 30 that can perform high transmission is provided on the second arm 15. Thereby, the 2nd arm 15 (arm housing | casing 20) comes to reduce each temperature rise of 2nd motor M2 connected with 2nd arm 15 itself and there.

As described above, according to the horizontal articulated robot using the swivel arm with a heat radiation function of the present embodiment, the following effects can be obtained.
(1) After the heat of the second motor M2 is absorbed by the heat absorbing portion 36 of the heat radiating device 30, it is moved by the heat pipe 35 to the heat radiating portion 31 that is farther from the support shaft 14 than the second motor M2. The heat radiating portion 31 is exposed to a strong air flow formed with the pivoting movement of the arm 15 so that heat is radiated from the heat radiating portion 31 to the outside. As a result, the heat radiation efficiency of the second motor M2 provided in the second arm 15 can be increased, and the temperature rise of the second motor M2 is reduced, and the second motor M2 has its function. Is less likely to be regulated by temperature rise. That is, the second motor M2 that rotates the second arm 15 is less likely to exceed a predetermined temperature range that is predetermined in order to maintain its performance and life by reducing the temperature rise. It is difficult to limit operation such as rotation speed and operating time. That is, by adopting such a heat dissipation device 30 for the second motor M2, it is possible to speed up the operation of the second arm 15 and shorten the non-operating time.

  (2) By providing the heat dissipating part 31 at a position away from the support shaft 14 by the distance L2, the cooling capacity is increased as the amount of air in contact with the unit time increases due to receiving a strong air current during turning movement. Will be improved. Furthermore, since the heat radiating part 31 is arranged at a position away from the second motor M2, the heat radiation part 31 is arranged at a position where heat from the second motor M2 is not transmitted so much. Efficient heat dissipation is also performed from the heat dissipating part whose heat dissipation efficiency is improved as the temperature difference increases. This also increases the cooling capacity (heat radiation efficiency) of the second motor M2.

  (3) Since the heat absorbing portion 36 and the heat radiating portion 31 are separated from each other, the degree of freedom of arrangement of the heat absorbing portion 36 and the heat radiating portion 31 in the second arm 15 is increased, and the arrangement of various devices is increased in density by downsizing. Even if it is the 2nd arm 15 currently provided, the space which arrange | positions the thermal radiation apparatus 30 can be ensured, maintaining the freedom degree of arrangement | positioning of those apparatuses in the 2nd arm 15. FIG.

  (4) The heat dissipating part 31 is provided with heat dissipating fins 33 so that the contact area with air is increased. As a result, the heat radiation efficiency through the heat radiating part 31 is increased, and the temperature rise of the second motor M2 is reduced.

(5) When the second arm 15 is swung and moved, airflow generated around the second arm 15 due to the swiveling movement is a space between each heat dissipating fin 33 and each heat dissipating fin 33 of the heat dissipating unit 31. 34 also flows into these spaces 34. As a result, a large amount of air flows through the side surfaces of the heat radiating fins 33 of the heat radiating unit 31, and the amount of air that the side surfaces of the heat radiating fins 33 are in contact with each unit time increases. Can be enhanced. As a result, the cooling performance of the second motor M2 radiated from the heat radiating unit 31 is improved, and the temperature rise of the second motor M2 is more suitably reduced.

  (6) The heat accommodated in the heat absorbing portion 36 is quickly moved to the heat radiating portion 31 by the heat pipe 35 having high heat transfer performance. Thereby, as the heat dissipation capability of the heat dissipation unit 31 can be fully utilized, the cooling capability of the heat absorption unit 36 with respect to the second motor M2 is further improved. As a result, the heat dissipation efficiency of the second motor M2 is increased, the temperature rise of the second motor M2 is reduced, and inconveniences such as operation restrictions caused by the temperature rise are avoided.

  (7) By using the heat pipe 35, the path between the heat absorbing portion 36 and the heat radiating portion 31 can be selected with a high degree of freedom while maintaining its high heat transfer performance. The freedom degree of arrangement | positioning of the thermal absorption part 36 and the thermal radiation part 31 in the arm 15 comes to be raised more.

  (8) The heat pipe 35 is provided with a height difference between the heat radiating portion 31 and the heat absorbing portion 36. As a result, the return of the working fluid as a heat transfer material radiated and liquefied at the heat radiating end of the heat pipe 35 to the heat absorbing end is also performed by gravity. In general, in a heat pipe, hydraulic fluid that is liquefied by radiating at the heat radiating end is circulated to the heat absorbing end provided at a position lower than the heat radiating end by a capillary phenomenon, but in addition to that, a flow due to gravity is secured. As a result, the reflux to the endothermic end of the hydraulic fluid is performed more quickly. The rapid recirculation of the hydraulic fluid to the heat absorbing part 36 side improves the heat transfer capability of the heat pipe 35, so that the cooling capability of the second motor M2 is further improved and the temperature rise of the second motor M2 is suitably suppressed. Become so.

In addition, you may change the said embodiment as follows.
In the above embodiment, the heat radiating device 30 is composed of one heat radiating part 31, one heat absorbing part 36, and one heat pipe 35 that thermally couples the heat radiating part 31 and the heat absorbing part 36. . However, the present invention is not limited to this, and the heat dissipation device may have a plurality of at least one of the heat dissipation unit, the heat absorption unit, and the heat pipe as long as the heat of the heat absorption unit can be transmitted to the heat dissipation unit by the heat pipe.

  For example, as shown in FIG. 6A, one heat dissipating part 31A provided on the second arm 15 and one heat absorbing part 36A coupled to the second motor M2 are connected to two heat pipes 35A, 35B. May be thermally coupled. In this way, more heat is transmitted from the heat absorbing portion 36A to the heat radiating portion 31A. In addition, when it is difficult to dispose a heat pipe having a large diameter and sufficient heat transfer due to space limitations in the second arm 15, a plurality of heat pipes having a small distributable diameter and a small heat that can be transmitted can be provided. The amount of heat that can be provided and transferred can be maintained.

Further, for example, as shown in FIG. 6B, one heat radiating portion 31B provided on the second arm 15 and two heat absorbing portions 36 coupled to the second motor M2 are connected to one heat pipe 35C. May be thermally coupled. In general, the heat pipe functions as a heat absorbing end where the hydraulic fluid accumulates, while the heat pipe functions as a heat radiating end where the vaporized hydraulic fluid stays. Therefore, one end of the heat pipe 35C is coupled to one endothermic part 36, the other end different from the one end is coupled to another endothermic part 36 different from the endothermic part 36, and an intermediate part thereof is higher than both ends. Even if it is made to couple | bond with the heat radiation part 31B of a position, the heat | fever of each heat absorption part 36 comes to be efficiently moved to the heat radiation part 31B.

  In the above embodiment, the radiating fins 33 are wall-like protrusions extending in parallel to the turning direction. However, the radiating fins are not limited to this, and the radiating fins can increase the radiating amount of the radiating portions by increasing the surface area. If so, other structures may be used. For example, as shown in FIG. 7, the heat dissipating part 40 may be provided with a plurality of heat dissipating pins 41 as rod-shaped protrusions on the base part 40 </ b> B.

  In the space 42 parallel to the turning direction of the second arm 15 provided between the heat radiating pins 41 of the heat radiating portion 40, air based on the air flow formed by the heat radiating portion 40 as the second arm 15 turns. Thus, the heat dissipation efficiency when the second arm 15 is swung is increased. Further, in the space 43 parallel to the length direction of the second arm 15 provided between the heat radiation pins 41, an air flow due to the wraparound of the airflow flowing in the space 42 as the second arm 15 turns This also promotes heat dissipation from the heat dissipation pin 41.

  -In the said embodiment, although the thermal radiation part 31 was provided in the upper surface of the arm cover 21, not only this but a thermal radiation part is a place where much air distribute | circulates by the airflow produced by the turning movement of an arm, It can be placed anywhere on the outer surface of the arm.

  For example, as shown in FIG. 8, the heat radiating part 50 may be provided on one or both of the side surfaces of the arm cover 21. Accordingly, it is easy to secure a mounting space for the heat radiating unit 50, and if the heat pipe 35D has an upward inclination with respect to the heat radiating unit 50, the degree of freedom of the mounting position of the heat radiating unit 50 is also increased.

  Further, the heat radiating part 51 may be separated from the arm cover 21 such that a part of the heat radiating part 51 extends or protrudes from the arm cover 21. Thereby, the restrictions concerning the attachment of the heat dissipating part 51 to the arm cover 21 are eased and the degree of freedom in selecting the size is increased.

  Furthermore, the heat radiation part 52 may be provided at the forefront of the arm cover 21. When the second arm 15 pivots, the arm cover 21 moves fastest in the pivoting direction, so that a large amount of air is circulated through the heat dissipating part 52 provided there, and high heat dissipation. Efficiency can be obtained.

  In the above embodiment, the heat absorbing part 36 is thermally coupled to the second motor M2, but this is not a limitation, and the heat absorbing part may be thermally coupled to other heating elements installed on the arm. . For example, the heat absorption part may be thermally coupled to the rotary motor M3, the lifting motor M4, or the like as other heat generating elements, and the heat generated by these motors may be dissipated from the heat dissipation part.

  In the above-described embodiment and modification, each of the heat radiating portions 31 and 40 is provided with only one of the heat radiating fins 33 or the heat radiating pins 41. A pin may be provided in appropriate combination.

  In the above embodiment, the radiating fins 33 are formed in a wall shape. However, the present invention is not limited to this, and the radiating fins may be formed with a plurality of notches so as to cross the radiating fins. As a result, air similar to that of the heat radiation pin 41 is circulated through the portion where the notch is formed. Thereby, the contact area with the air of each protrusion of a heat radiating part will also increase, and the circulation of air will also increase.

In the above embodiment, the heat radiating device 30 is provided on the second arm 15, but the present invention is not limited thereto, and the heat radiating device may be provided on other arms. This further increases the possibility of adopting such a heat dissipation device.

  In the above embodiment, the heat radiating part 31 and the heat absorbing part 36 are thermally coupled from the heat pipe 35. However, the heat radiating part and the heat absorbing part are not limited to this, and a necessary amount of heat is transmitted between them. Other devices and members, for example, a metal member having high thermal conductivity may be used as long as it can be performed.

  DESCRIPTION OF SYMBOLS 11 ... Base, 12 ... Base axis | shaft, 13 ... 1st arm, 14 ... Support axis as a rotating shaft, 15 ... 2nd arm as a turning-type arm, 16 ... Vertical rotating shaft, 16B ... Ball screw nut , 16S ... spline nut, 17 ... lower end portion, 19 ... wiring duct, 20 ... arm housing, 21 ... arm cover, 30 ... heat dissipation device, 31, 31A, 31B ... heat dissipation portion, 32 ... base portion, 32a ... pipe Mounting groove, 33 ... radiating fin, 34 ... space, 35, 35A, 35B, 35C, 35D ... heat pipe, 35f ... outer peripheral surface, 35i ... inner wall, 36,36A ... heat absorbing portion, 36g ... pipe mounting groove, 37 ... sheet , 40 ... heat radiation part, 40B ... base part, 41 ... heat radiation pin, 42, 43 ... space, 50, 51, 52 ... heat radiation part, C1, C2, C3 ... axis, M1 ... first motor, M2 ... first 2 motors, M ... rotary motor, M4 ... elevating motor.

Claims (7)

A heating element that is installed on an arm that revolves horizontally around the rotation axis and that rotates the arm through rotation of the rotation axis, a heat absorption part that is thermally coupled to the heat generation element, and a heat absorption part that is thermally coupled to the heat absorption part. A heat dissipating part that dissipates the heat absorbed through the combined heat transfer device to the outside of the arm;
The heat dissipating part is disposed at a position farther from the heat generating element than the rotating shaft, and an air current is generated around the air based on the air received from the turning direction of the arm that is turned by the rotational driving of the rotating shaft by the heat generating element. The swivel type arm with a heat radiating device is characterized in that the heat transmitted from the heat absorbing portion is radiated by the formed air flow. The heat dissipating part has a base part supporting the heat dissipating part disposed along the outer surface of the arm, and the base part includes a plurality of protrusions extending in a wall shape along the outer surface of the arm. The swivel type arm with a heat dissipating device according to claim 1. A space formed between one protrusion of the plurality of protrusions and another protrusion adjacent to the one protrusion is opened in the turning direction of the arm. The swivel type arm with a heat dissipating device according to claim 2, wherein the swivel type arm is disposed on a base part. The swivel arm with a heat radiating device according to claim 2 or 3, wherein the plurality of protrusions are formed with a plurality of cutout portions so as to intersect with the protrusions. The revolving arm with a heat dissipation device according to any one of claims 1 to 4, wherein the heat transfer device is a heat pipe. The heat dissipation part according to claim 5, wherein the heat dissipating part is provided above the heat absorbing part in the arm, and the heat pipe is provided with a height difference between the heat dissipating part and the heat absorbing part. Swivel arm with device. A horizontal articulated robot in which a plurality of arms are connected horizontally via a rotation axis,
The horizontal articulated robot according to claim 1, wherein at least one of the plurality of arms is the turning arm with a heat dissipation device according to claim 1.

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