Patent Publication Number: US-2020284267-A1

Title: Sirocco fan, blowing device, and air conditioner

Description:
TECHNICAL FIELD 
     The present invention relates to a sirocco fan and an air conditioner including the sirocco fan as a blowing device. 
     TECHNICAL FIELD 
     A conventional indoor unit for an air conditioner includes inside: an air blower; and a heat exchanger surrounding an upper portion and a front portion of the air blower, as disclosed, for example, in Patent Document 1. In such an indoor unit, the air blower rotates to suck air from an inlet in an upper portion of the indoor unit. The sucked air passes through the heat exchanger, and then blows out from an outlet in a front-lower portion of the indoor unit. 
     An air conditioner recently developed is capable of purifying air in addition to conditioning air. For example, a high efficiency particulate air filter (HEPA filter) has a large air-flow resistance. Hence, the use of the HEPA filter for air purification inevitably reduces a volume of air blowing from the outlet. When the HEPA filter is used for air purification, it is necessary to secure a sufficient volume of the air (a sufficient volume of the air to be sucked). 
     A typical air conditioner includes a cross-flow fan as a blowing device. In order to obtain a sufficient volume of air, use of a sirocco fan is preferable. As illustrated in  FIG. 8 , for example, multiple sirocco fans  113  (two in  FIG. 8 ) each including two impellers  113   a  and  113   b  are connected in series to be used as a blowing device. 
     To rotate the sirocco fan  113 , the two impellers  113   a  and  113   b  need to be mounted on a rotation shaft  132  which transmits rotational force of a not-shown motor. In mounting the rotation shaft  132 , for example, the rotation shaft  132  is passed through a boss  131  formed inside the impeller  113   a , and is fastened with a screw inserted into a screw hole  131   a  opened on the boss  131 . 
     CITATION LIST 
     Patent Literature 
     [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2005-147508 (published on Jun. 9, 2005). 
     SUMMARY OF INVENTION 
     Technical Problem 
     As illustrated in  FIG. 8 , for example, the conventional sirocco fan has the boss  131  formed inside the impeller  113 . Hence, the screw hole  131   a  for fastening the rotation shaft  132  is also formed inside the boss  131 . Hence, when the screw is inserted in the screw hole  131   a  on the boss  131 , a notch  113   a  has to be provided to a portion of a blade of the impeller  113   a . Alternatively, the blade of the impeller  113   a  has to be partially removed for the screw to pass through the removed portion. Accordingly, when the blade of the impeller  113   a  is partially notched or removed, the impeller  113   a  fails to obtain a sufficient volume of air. 
     An aspect of the present invention intends to provide a sirocco fan in which a boss of an impeller and a rotation shaft can be fastened together without partially notching or removing a blade of the impeller. 
     Solution to Problem 
     In order to solve the above problem, a sirocco fan according to an aspect of the present invention includes: an impeller including a boss for securing a rotation shaft transmitting rotational force of a motor, the impeller being configured to rotate to suck air from a direction in parallel with the rotation shaft, and to eject the air from a rotation face of the impeller, wherein the boss is formed to protrude outward from an end face of the impeller sucking the air, and is provided with a screw hole opening, on a side face of a protruding portion of the boss, for fastening the rotation shaft with a screw. 
     Advantageous Effects of Invention 
     An aspect of the present invention makes it possible to fasten a boss of an impeller and a rotation shaft together without partially notching or removing a blade of the impeller. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating an appearance of an indoor unit for an air conditioner according to an embodiment of the present invention. 
         FIG. 2  is a vertical cross-sectional view of the indoor unit illustrated in  FIG. 1 . 
         FIG. 3 ( a )  is a schematic side view of the indoor unit, illustrating conditions of an open-close lid and an air guiding plate when the air conditioner of the embodiment is OFF.  FIG. 3 ( b )  is a schematic side view of the indoor unit, illustrating conditions of the open-close lid and the air guiding plate when the air conditioner is in an air-conditioning mode and set cooling.  FIG. 3 ( c )  is a schematic side view of the indoor unit, illustrating conditions of the open-close lid and the air guiding plate when the air conditioner is in an air purification mode and set cooling. 
         FIG. 4  is a perspective view schematically illustrating a configuration of a blowing device according to this embodiment. 
         FIG. 5  is a view illustrating how to connect together a sirocco fan and motor included in the blowing device illustrated in  FIG. 4 . 
         FIG. 6  is a schematic view illustrating a configuration of a blowing device according to a second embodiment of the present invention. 
         FIG. 7  is a schematic view illustrating a configuration of a blowing device according to a third embodiment of the present invention. 
         FIG. 8  is a schematic view illustrating a configuration of a conventional sirocco fan. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     First Embodiment 
     Described below are embodiments of the present invention, with reference to the drawings.  FIG. 1  is a perspective view illustrating an appearance of an indoor unit  1  for an air conditioner according to this embodiment.  FIG. 2  is a vertical cross-sectional view of the indoor unit  1  for the air conditioner illustrated in  FIG. 1 . 
     (Outline of Indoor Unit  1 ) 
     As illustrated in  FIG. 1 , the indoor unit  1  of the air conditioner includes an air guiding plate  3  in front of an indoor-unit body  2 . As illustrated in  FIG. 2 , the indoor-unit body  2  includes: a first inlet  11  in an upper portion thereof; a second inlet  12  in a lower portion thereof; an air-blowing fan  13  and a heat exchanger  14  therein; and an outlet  17  in a front portion thereof. The air-blowing fan  13  and the heat exchanger  14  constitute a blowing device. 
     Moreover, the indoor unit  1  includes: a first filter  15  inside (below) the first inlet  11 ; and a second filter  16  inside (above) the second inlet  12 . For example, the first filter  15  is functionally equivalent to a prefilter, and lower in performance and smaller in air-flow resistance than the second filter  16 . For example, the second filter  16  is an HEPA filter, and higher in performance and greater in air-flow resistance than the first filter  15 . 
     In the indoor unit  1 , the air sucked from the first inlet  11  passes through the first filter  15 , the air-blowing fan  13 , and the heat exchanger  14 , and blows out from the outlet  17 . Furthermore, the air sucked from the second inlet  12  passes through the second filter  16 , the air-blowing fan  13 , and the heat exchanger  14 , and blows out from the outlet  17 . 
     The first inlet  11  is provided with an open-close lid  18  opening and closing the first inlet  11 .  FIG. 3 ( a )  is a schematic side view of the indoor unit  1 , illustrating conditions of the open-close lid  18  and the air guiding plate  3  when the air conditioner is OFF.  FIG. 3 ( b )  is a schematic side view of the indoor unit  1 , illustrating conditions of the open-close lid  18  and the air guiding plate  3  when the air conditioner is in an air-conditioning mode and set cooling.  FIG. 3 ( c )  is a schematic side view of the indoor unit, illustrating conditions of the open-close lid  18  and the air guiding plate  3  when the air conditioner is in an air purification mode and set cooling. 
     As illustrated in  FIG. 3 ( a ) , the open-close lid  18  is closed when the air conditioner is OFF. Moreover, as illustrated in  FIG. 3 ( b ) , the open-close lid  18  is open when the air conditioner operates, prioritizing air conditioning over air purification (in the air-conditioning mode). Furthermore, as illustrated in  FIG. 3 ( c ) , the open-close lid  18  is closed when the air conditioner operates, prioritizing air purification over air conditioning (in the air purification mode). 
     The air-blowing fan is a sirocco fan, and serves as a blowing device of the indoor unit  1  for the air conditioner. The blowing device will be described later in detail. 
     The heat exchanger  14  includes two heat exchangers vertically connected together with the connection of the two heat exchangers protruding forward (in a dogleg shape), and provided in front of the air-blowing fan  13  (closer to the front of the indoor unit  1  than the air-blowing fan  13  is). 
     (Structure of Blowing Device) 
       FIG. 4  is a perspective view schematically illustrating a blowing device according to this embodiment. 
     The illustration (a) in  FIG. 5  shows a side view of the blowing device. The illustration (b) shows a side cross-sectional view of the blowing device in the illustration (a). Note that, for the sake of the description,  FIG. 5  exemplifies a case where the air-blowing fan  13  is placed to one side of a driving motor (a motor)  33 . 
     As illustrated in  FIG. 4 , the blowing device according to this embodiment includes: a cabinet  30 ; two air-blowing fans  13 ; and a driving motor  33 . The air-blowing fans  13  and the driving motor  33  are longitudinally arranged inside the cabinet  30 . The driving motor  33  is placed between the two air-blowing fans  13 , and transmits rotational force to the both air-blowing fans  13 . That is, the driving motor  33  here is a dual-shaft motor having rotation shafts  32  longitudinally aligned. 
     Each of the rotation shafts  32  for transmitting the rotational force from the driving motor  33  is inserted in a boss  31  for one of the air-blowing fans  13 . The rotation shaft  32  is then screwed and fastened. Across the driving motor  33  from the air-blowing fan  13 , the rotation shaft  32  is supported by a bearing  34 , and inserted in the boss  31  for the air-blowing fan  13 . The rotation shaft  32  is then screwed and fastened. 
     The air-blowing fan  13  shown in the illustration (b) of  FIG. 5  is a sirocco fan including two impellers  13   a  connected together through their respective disc faces  13   b . That is, in the air-blowing fan  13 , each of the impellers  13   a  rotates in a predetermined direction to suck air from an end face  13   c , of the impeller  13   a , in parallel with the rotation shaft  32 , and ejects the air from a rotation face  13   d  of the impeller  13   a.    
     The boss  31  of the impeller  13   a  is a hollow tube made of aluminum. The boss  31  is formed to penetrate the disc face  13   b  of the impeller  13   a , and partially protrudes out of the end face  13   c  across from the disc face  13   b . That is, the boss  31  is formed to protrude outward from the end face  13   c  (the end face across from the disc face  13   b ) sucking the air when the impeller  13   a  rotates. The boss  31  is provided with a screw hole  31   a  opening, on a side face of a portion of the boss  31  partially protruding from the impeller  13   a , for fastening the rotation shaft  32  with a screw. The rotation shaft  32  is made of stainless, and transmits driving force of the driving motor  33 . 
     Hence, the screw hole  31   a  is open on the side face of the boss  31  protruding from the impeller  13   a . Such a feature eliminates the need of a conventional notch to be provided to the impeller  13   a  for tightening a screw, facilitating the tightening with a screwdriver. 
     As to the position of each screw hole  31   a , as shown in the illustration (b) in  FIG. 5 , the screw holes  31   a  are open, on their respective bosses  31  for the horizontally arranged impellers  13   a , to face completely opposite from each other (i.e., one of the screw holes  31   a  faces up and the other screw hole  31  faces down); that is, the screw holes  31   a  shift 180° from each other in a rotation direction of the rotation shaft  32 . Such a feature makes it possible to attain a weight-distribution balance when a screw is tightened in the screw hole  31 , contributing to stable rotation of the air-blowing fan  13 . 
     Note that the screw holes  31   a  may be open on different positions of the bosses  31  of the two impellers  13   a . The screw holes  31   a  do not have to shift 180° from each other in the rotation direction of the rotation shaft  32 . 
     In other words, preferably, the two impellers  13   a  may be connected through the disc faces  13   b  across from the end faces  13   c  sucking air, and the screw hole  31   a  opening on the boss  31  of one of the two impellers  13   a  and the screw hole  31   a  opening on the boss  31  of another one of the two impellers  13   a  may be provided not in a single plane. 
     Moreover, when the air-blowing fan  13  includes multiple air-blowing fans  13 , the screw holes  31  opening on the bosses  31  of the impellers  13   a  may sequentially shift 90° from each other in the rotation direction of the rotation shaft  32 . 
     Furthermore, the screw hole  31   a  may be open on the side face of the boss  31  protruding completely outward from the end face  13   c  sucking the air when the impeller  13   a  rotates. Alternatively, the screw hole  31   a  may be open on a side face of the boss  31  slightly inward in relation to the end face  13   c . At least, the screw hole  31   a  may be positioned to allow for an easy access of a screwdriver when the screw is tightened in the screw hole  31   a.    
     Advantageous Effects 
     In the above blowing device, a blade of the impeller  13   a  does not have to be partially notched or removed in order to pass a screw through the screw hole  31   a , opening on the boss  31 , when the boss  31  is fastened to the rotation shaft  32 , unlike the case illustrated in  FIG. 8  of the conventional art when the boss  31  is formed inward in relation to the air-sucking end face  13   c  of the impeller  13   a.    
     Such features make it possible to reduce a decrease in a volume of the air when a blade of the impeller  13   a  is partially notched or removed. 
     In addition, a mold for forming the impeller does not have to be shaped into a complex shape, unlike the case where a blade of the impeller is to be partially notched or removed. Such a mold contributes to reduction in manufacturing costs. 
     Moreover, as shown in the illustration (b) of  FIG. 5 , the boss  31  is formed to protrude from the impeller  13   a , and the protruding portion has the screw hole  31   a . Hence, the rotation shaft  32  does not have to pass through the boss  31 . Such a feature makes it possible to make the weight of the blowing device lighter, compared with a conventional case where the rotation shaft passes through the boss. 
     Second Embodiment 
     Described below is still another embodiment of the present invention, with reference to the drawings. Note that, for the sake of explanation, identical reference signs are used to denote components with identical functions between the preceding embodiment and this embodiment. Such components will not be elaborated upon here. 
     Exemplified in the first embodiment is a blowing device including a dual-shaft motor serving as the driving motor  33 . Alternatively, exemplified in this embodiment is a blowing device including a single-shaft motor serving as the driving motor  33 . The single-shaft motor is provided with the rotation shaft  32  on one side alone. 
       FIG. 6  is a perspective view schematically illustrating the blowing device according to this embodiment. 
     As illustrated in  FIG. 6 , the blowing device according to this embodiment is similar in including the two air-blowing fans  13  and the one driving motor  33  to the blowing device (in  FIG. 4 ) according to the first embodiment. The blowing device according to this embodiment is different in placement of the driving motor  33  from the blowing device according to the first embodiment. The two air-blowing fans  13  are connected together in series with a joint  35  connecting the bosses  31  facing each other. The rotation shaft  32  of the driving motor  33  is connected to the boss  31 , of one of the air-blowing fans  13  (the air-blowing fan  13  on the observer&#39;s right in  FIG. 6 ), across from the joint  35 . Thus, the rotational force of the driving motor  33  is transmitted to the boss  31  connected to the rotation shaft  32  of the driving motor  33 , and to the other boss  31  of the air-blowing fan  13  on the left connected through the joint  35  to the air-blowing fan  13  on the right provided with the boss  31 . Hence, the two air-blowing fans  13  are rotated by the driving motor  33 . 
     Note that, in  FIG. 6 , the rotation shaft  32  secured to the left boss  31  of the air-blowing fan  13  on the left is supported by a not-shown bearing. 
     In the above blowing device, the air-blowing fans  13  are connected together by the joint  35 . By simply changing the length of the joint  35 , the longitudinal length of the blowing device can be easily adjusted. 
     Moreover, when the joint  35  is made of stainless instead of steel, the blowing device can be made lighter. 
     Third Embodiment 
     Described below is still another embodiment of the present invention, with reference to the drawings. Note that, for the sake of explanation, identical reference signs are used to denote components with identical functions between the preceding embodiments and this embodiment. Such components will not be elaborated upon here. 
       FIG. 7  is a perspective view schematically illustrating the air-blowing fan  13  of a blowing device according to this embodiment. 
     In the air-blowing fan  13  as illustrated in  FIG. 7 , the disc face  13   b  is inscribed with a marking  41  to distinguish between the left and the right of the disc face  13   b . An example in  FIG. 7  shows that the sign “ ” is inscribed as the marking  41  indicating left and the sign “ ” is inscribed on the not-shown other side of the disc face  13   b  as the marking  41  indicating right. 
     In this embodiment, the air-blowing fan  13  includes the two impellers  13   a  connected together through their respective disc faces  13   b . If the impellers  13   a  are mounted on the rotation shaft  32  in a wrong direction, the air is blown in the opposite direction. That is, if the impellers  13   a  are mounted on the rotation shaft  32  in a wrong direction, the impellers  13   a  rotate in the opposite direction to the intended rotation direction. Hence, the air is not sucked in a face perpendicular to the rotation direction of the impellers  13   a . On the contrary, the air is blown out of the face. In order to avoid such a problem, the marking  41  is inscribed on the disc face  13   b  to distinguish between the right and the left. In this embodiment, a part of a mold for the impeller  13   a  serves as an insert for inscribing the marking  41 , so that the marking  41  is inscribed simultaneously when the impeller  13   a  is molded. 
     As described above, the marking  41  is inscribed on the disc face  13   b  of the impeller  13   a . Thus, when mounting the air-blowing fan  13  on the rotation shaft  32 , a manufacturing worker can identify the left or the light of the impeller  13   a  by simply looking at the marking  41 . Such a feature can reduce the risk that the manufacturing worker would inadvertently switch the right and the left when mounting the impeller  13   a.    
     Moreover, the feature can reduce such a risk of inadvertently switching the right and the left in the mounting not only in the manufacturing but also in re-assembling the impeller  13   a  and the rotation shaft  32  dismounted for repair and inspection after the manufacturing of the blowing device. 
     Hence, the feature makes it possible to clearly distinguish the difference between the right and the left of the impeller  13   a  when the impeller  13   a  is mounted on the rotation shaft  32  in manufacturing or repair and inspection of the blowing device, compared with a case of identifying whether the right and the left are inadvertently switched once the rotation shaft  32  and driven. Thus, the feature saves the trouble of mounting the impeller  13   a  on the rotation shaft  32  again after they have already been assembled together. 
     Note that, in the example illustrated in  FIG. 7 , the marking  41  is represented in, but is not limited to, Chinese characters “ ” and “ ” respectively equivalent to the left and the right in English words. Alternatively, English words “Right” and “Left” may be respectively inscribed on the right and the left of the disc face  13   b . Moreover pairs “  (Right)” and “  (Left)” may be respectively inscribed on the right and the left of the disc face  13   b.    
     Furthermore, depending on an assembly process, the impellers can be mounted not in the horizontal right-left direction but in the vertical up-down direction. Hence, the marking  41  may identify the vertical direction. 
     That is, the marking  41  may be any given marking as long as the worker does not inadvertently switch the right and the left (up and down) when securing the impellers  13   a  to the rotation shaft  32 . Other than the above inscription visually recognizable, the marking  41  may be embossed (not shown) on a portion of the disc face  13   b  or the impeller  13   a , so that the user can feel the embossed marking  41  to identify the right and the left (up and down). 
     Furthermore, in the above example, two markings are inscribed or formed to identify the right and the left (up and down) of the two impellers  13   a . Alternatively, the marking  41  may be inscribed or formed on at least one of the two impellers  13   a  because if the right and the left (up and down) are identified for one of the impellers  13   a , the right and the left (up and down) for the other impeller  13   a  are also identified. 
     As can be seen, the marking  41  is provided to at least one of the two impellers  13   a  to identify the direction in which the impellers  13   a  are mounted on the rotation shaft  32 . Such a feature makes it possible to reduce the risk of mounting the impellers  13   a  on the rotation shaft  32  in the wrong rotation direction. 
     Note that the marking  41  is formed using, but not limited to, an insert with a mold for manufacturing the impellers  13   a . The marking  41  may be either stamped or attached in the form of a sticker on the disc face  13   b  after the impellers  13   a  are manufactured. 
     In addition, the two impellers  13   a  of the air-blowing fan  13  are formed horizontally symmetrically, contributing to component sharing. Such a feature makes it possible to reduce manufacturing costs. 
     SUMMARY 
     A sirocco fan according to a first aspect of the present invention includes the impeller  13   a  including the boss  31  for securing the rotation shaft  32  transmitting rotational force of a motor (the driving motor  33 ), the impeller  13   a  rotating to suck air from a direction in parallel with the rotation shaft  32 , and to eject the air from the rotation face  13   d  of the impeller  13   a , wherein the boss  31  is formed to protrude outward from the end face  13   c  of the impeller  13   a  sucking the air, and is provided with the screw hole  31   a  opening, on a side face of a protruding portion of the boss  31 , for fastening the rotation shaft  32  with a screw. 
     In the above configuration, the boss for securing the rotation shaft transmitting rotational force of the motor is formed to protrude outward from the end face of the impeller sucking the air. The boss is provided with the screw hole opening, on the side face of a protruding portion of the boss, for fastening the rotation shaft with a screw. Thanks to the features, a blade of the impeller does not have to be partially notched or removed in order to pass a screw through the screw hole, opening on a side face of the boss, when the rotation shaft is fastened with the screw, unlike the case when the boss is formed inward in relation to the air-sucking end face of the impeller. 
     Such features make it possible to reduce a decrease in a volume of the air when a blade of the impeller is partially notched or removed. 
     In addition, a mold for forming the impeller does not have to be shaped into a complex shape, unlike the case where a blade of the impeller is to be partially notched or removed. 
     In the sirocco fan, of a second aspect of the present invention, according to the first aspect, the impeller  13   a  may include two impellers  13   a  each having a face (the disc face  13   b ) across from the end face  13   c  sucking the air, and connected together through the face, and the screw hole  31   a  opening on the boss  31  of one of the two impellers  13   a  and the screw hole  31   a  opening on the boss  31  of another one of the two impellers  13   a  may be provided not in a single plane. 
     In the above configuration, when two impellers are connected together, the screws tightening the rotation shaft on the bosses for the two impellers are provided not in a single plane, thereby reducing an imbalance of weight distribution due the weight of the screws. Such a feature contributes to stable rotation of the two impeller. 
     In the sirocco fan, of a third aspect of the present invention, according to the second aspect, the screw hole  31   a  opening on the boss  31  of one of the two impellers  13   a  and the screw hole  31   a  opening on the boss  31  of the other one of the two impellers  13   a  may shift 180° from each other in a rotation direction of the rotation shaft  32 . 
     In the above configuration, the screw hole opening on the boss of one of the two impellers and the screw hole opening on the boss of the other one of the two impellers shift 180° from each other in the rotation direction of the rotation shaft. Accordingly, the screws tightening the rotation shaft on the bosses for the two impellers are provided not in a single plane, and are positioned to shift 180° from each other in the rotation direction of the rotation shaft, thereby reducing an imbalance of weight distribution due the weight of the screws. Such a feature contributes to stable rotation of the two impeller. 
     In the sirocco fan, of a fourth aspect of the present invention, according to the second or third aspect, at least one of the two impellers  13   a  may include the marking  41  identifying a direction in which the rotation shaft  32  is mounted. 
     When a typical sirocco fan rotates in a wrong direction, the air is not sucked in a face perpendicular to the rotation direction of the impellers. On the contrary, the air is blown out of the face. In order to avoid such a problem, the impellers need to be secured to the rotation shaft not to rotate in the wrong direction. 
     As can be seen, the marking is provided to at least one of the impellers to identify the direction in which the impellers are mounted on the rotation shaft. Such a feature makes it possible to reduce the risk of mounting the impellers on the rotation shaft in the wrong rotation direction. 
     In the sirocco fan, of a fifth aspect of the present invention, according to any one of the first to fourth aspects, the boss may be made of aluminum. 
     In the above configuration, the bosses are made of aluminum, contributing to reducing the weight of the sirocco fan as a whole. 
     A blowing device of a sixth aspect of the present invention includes the sirocco fan (the air-blowing fan  13 ) according to any one of the second to fifth aspects, the sirocco fan (the air-blowing fan  13 ) including a plurality of sirocco fans (the air-blowing fans  13 ) rotatably connected together in series. 
     Such a configuration allows the blowing device to supply a sufficient volume of air. 
     An air conditioner of a seventh aspect of the present invention includes the sirocco fan (the air-blowing fan  13 ), according to any one of the first to fifth aspects, serving as a blowing device. 
     In the above configuration, the air to be obtained is larger in volume and higher in pressure compared with a case of using a cross-flow fan as the air-blowing fan. In the use of an HEPA filter for air purification, such a feature makes it possible to ensure a sufficient volume of the air (a sufficient volume of the air to be sucked). 
     The present invention shall not be limited to the embodiments described above, and can be modified in various manners within the scope of claims. The technical aspects disclosed in different embodiments are to be appropriately combined together to implement an embodiment. Such an embodiment shall be included within the technical scope of the present invention. Moreover, the technical aspects disclosed in each embodiment are combined to achieve a new technical feature. 
     REFERENCE SIGNS LIST 
     
         
           13  Air-Blowing Fan (Sirocco Fan) 
           13   a  Impeller 
           13   b  Disc Face 
           13   c  End Face 
           13   d  Rotation Face 
           31  Boss 
           31   a  Screw Hole 
           32  Rotation Shaft 
           33  Driving Motor (Motor) 
           35  Joint 
           41  Marking