Patent Publication Number: US-2010109336-A1

Title: Apparatus for wind power generation with a vertical axis

Description:
TECHNICAL FIELD 
     The present invention relates, in general, to an apparatus for wind power generation with a vertical axis, and more particularly, to an apparatus for wind power generation with a vertical axis, in which, even if opposing winds blow toward a plurality of wind rotors disposed in a matrix arrangement in opposite directions, one in which electricity is generated and the other in which electricity is not generated, electricity is generated using the wind blowing in the direction in which electricity is generated without any interference from the wind blowing in the direction in which electricity is not generated, thereby preventing rotational force from being decreased by the opposing winds, which blow in a special climate environment, for instance, in different directions, particularly, in Korea. 
     As is generally known in the art, a wind power generator converts natural wind into electric energy by rotating a wind rotor using the wind and then driving an electric generator using gears connected with the wind rotor. Such a wind power generator is a kind of nonpolluting natural energy source, and is spotlighted as the most economical one of the alternative energy sources to replace fossil fuels. 
     Wind power generators are classified as horizontal axis types and vertical axis types according to the orientation of a rotary shaft having blades. 
     BACKGROUND ART 
       FIG. 1  is a perspective view of an existing apparatus for wind power generation having a vertical axis (Korean Utility Model Registration No. 20-0019653).  FIG. 2  is a sectional view illustrating the state of the wind rotor blade having the construction of  FIG. 1  when in use. 
     As illustrated, the apparatus for wind power generation having a vertical axis comprises a plurality of rotary shafts  2  and  2 ′, which are rotatably installed on a base  1 , a plurality of wind rotors  3 , which are fixedly installed along the rotary shafts  2  and  2 ′ and each have four wind rotor blades  3   a  connected to each other in a crisscross form, support plates P and P′, which rotatably support the plurality of rotary shafts  2  and  2 ′, ropes  4  and  4 ′, which fixedly support the support plates P and P′, a rotary unit  5 , which is connected to the rotary shafts  2  and  2 ′ and is supplied with rotational force from the rotary shafts  2  and  2 ′, and an electric generator  6 , which converts the rotational force supplied from the rotary shafts  2  and  2 ′ into electricity as electric power. Among the faces constituting each wind rotor blade  3   a , one that mainly comes into contact with wind, i.e. a wind pressure plate  31   a , is hinged so as to be open in one direction. 
     For this reason, when a strong wind or a tempest is raging, the wind pressure plate  31   a  of each wind rotor blade  3   a  is open to minimize the damage to each wind rotor blade  3   a.    
     In spite of this advantage, the apparatus for wind power generation having a vertical axis has the following drawbacks. 
     In general, the wind power generation functions to generate electricity in the electric generator  6  using the rotational force generated by the wind, so that the wind rotor  3  must be able to maintain rotation in one direction (here, in a counterclockwise direction) for a long time. 
     However, unlike the climate environment in foreign countries, the climate environment in Korea is as follows. The wind frequently changes direction, and furthermore has a different direction at the upper and lower sides of the wind rotors  3 , which are vertically fixed along the rotary shafts  2  and  2 ′. Further, the intensity of wind corresponds to soft wind. 
     For this reason, in the case in which the wind, which blows toward the upper ones of the wind rotors  3 , which are vertically fixed along the rotary shafts  2  and  2 ′, is forward wind W 1 , blowing in the direction in which electricity is generated, and in the case in which the wind, which blows toward the lower ones of the wind rotors  3 , is reverse wind W 2 , blowing in a direction in which electricity is not generated, the rotary shafts  2  and  2 ′ are difficult to rotate from a mathematical standpoint because the wind rotors  3  are fixed to the rotary shafts  2  and  2 ′. 
     Further, because the intensity of the reverse wind W 2 , striking the rear surface of each wind rotor blade  3   a , is weak, the wind pressure plate  31   a  hinged to each wind rotor blade  3   a  does not completely open. Hence, the space where the hinged wind pressure plate  31   a  is pivoted to be generated is also narrow, and thus the reverse wind W 2  striking the rear surface of each wind rotor blade  3   a  does not smoothly go through the space. As a result, the rotational speeds of the rotary shafts  2  and  2 ′ are reduced because the winds W 1  and W 2  blowing in different directions offset each other. In this manner, the apparatus for wind power generation with a vertical axis has an effective value of minimizing the damage to the equipment under specific climate conditions such as a strong wind or a tempest, but has a low power generation yield under everyday climate conditions. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     Accordingly, the present invention has been made in an effort to solve the problems occurring in the related art, and an object of the present invention is to provide an apparatus for wind power generation with a vertical axis, in which, even if opposing winds blow toward a plurality of vertically arranged wind rotors in opposite directions, one in which electricity is generated and the other in which electricity is not generated, electricity is generated using only the wind blowing in the direction in which electricity is generated without any interference from the wind blowing in the direction in which electricity is not generated, thereby preventing rotational force from being offset by the opposing winds (W 1  and W 2 ), which blow in a special climate environment, for instance, in different directions, particularly, in Korea. 
     Technical Solution 
     In order to achieve the above object, according to one aspect of the present invention, there is provided an apparatus for wind power generation with a vertical axis, which comprises: at least one independent energy transmission vertical joint group having at least two independent energy transmissions coupled vertically to each other, the independent energy transmissions comprising joint rotary shafts; one-way bearings, to inner circumferences of which outer circumferences of the joint rotary shafts are fixed, and which cause the joint rotary shafts to rotate when rotated in a forward direction, but run idle without rotating the joint rotary shafts when rotated in a reverse direction; plain bearings, each of which has a through-hole formed in the center thereof; joint wind rotors, which are hollow so as to mount the joint rotary shafts, on inner circumferences of which seats are formed so as to seat the one-way bearings, to outer circumferences of which cup-like blades are coupled, and at lower portions of which contact bases are formed so as to be inserted into the through-holes of the plain bearings; cradle tubes, which are hollow, on inner circumferences of which seats are formed so as to seat the plain bearings, and upper surfaces of which are not in contact with the joint wind rotors when assembled; fixture joint members, fixing the independent energy transmission vertical joint groups in a transverse direction; a first bevel gear, coupled to the joint rotary shaft of the lowermost one of the independent energy transmissions constituting each independent energy transmission vertical joint group; a second bevel gear, engaged with the first bevel gear; a power relay shaft passing through and fixed to the second bevel gear; a gear box coupled to one end of the power relay shaft; and a power generator coupled to the gear box and generating electricity using a transmitted rotational force as power. 
     According to another aspect of the present invention, in order to vertically couple the independent energy transmissions, the joint rotary shafts are integrally formed, at opposite ends thereof, with joint studs, on outer circumferences of which male splines are formed; joint journals have female splines formed on inner circumferences thereof; and the joint studs of the joint rotary shafts, which are disposed in a row, are inserted into the joint journals in opposite directions. 
     According to another aspect of the present invention, the fixture joint members include joint fixture tubes and struts; the cradle tubes are provided with flanges at ends thereof; the flanges of the cradle tubes of two adjacent independent energy transmissions constituting each independent energy transmission vertical joint group are brought into contact with the joint fixture tube and then are fixed by a fastener; and the joint fixture tubes, which are vertically disposed, are coupled between the struts. 
     According to another aspect of the present invention, the apparatus further comprises additional supports disposed under the joint fixture tubes such that the flanges of the cradle tubes can be firmly fixed to the joint fixture tubes of the fixture joint members and are fixed by a fastener and then nuts, wherein the supports are provided with through-holes through which the joint rotary shafts pass. 
     According to another aspect of the present invention, in order to couple the first bevel gear to the joint rotary shaft of the lowermost one of the independent energy transmissions constituting each independent energy transmission vertical joint group, the apparatus further comprises: a rotational force transmission shaft, which is inserted into the female spline of the joint journal coupled to the joint rotary shaft; a one-way bearing for the transmission shaft, which is press-fitted around the joint rotary shaft, is engaged when the joint rotary shaft is rotated in a forward direction, and runs idle when the joint rotary shaft is rotated in a reverse direction; an idle induction tube, which is fitted around the one-way bearing, is coupled to the first bevel gear on one side thereof, is rotated together with the first bevel gear when the joint rotary shaft is rotated in a forward direction, and runs idle when the joint rotary shaft is stopped and when the second bevel gear is rotated in a forward direction. 
     ADVANTAGEOUS EFFECTS 
     According to the inventive apparatus for wind power generation with a vertical axis as described above, even if the opposing winds blow toward the plurality of vertically arranged wind rotors in opposite directions, one in which electricity is generated and the other in which electricity is not generated, electricity is generated using only the wind blowing in the direction in which electricity is generated without any interference from the wind blowing in the direction in which electricity is not generated, so that the efficiency of power generation can be improved. 
     Further, even if the forward wind and the reverse wind blow toward the wind rotors coupled to joint rotary shafts, the rotational force transmitted from the reverse wind is dissipated by the idling of the wind rotors without being transmitted to the joint rotary shafts, so that the occurrence of fatigue failure is minimized. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating an existing apparatus for wind power generation with a vertical axis; 
         FIG. 2  is a sectional view illustrating the state of a wind rotor blade having the construction of  FIG. 1  when in use; 
         FIG. 3  is a perspective view illustrating an apparatus for wind power generation with a vertical axis of the present invention; 
         FIG. 4  is a sectional view illustrating important parts of an apparatus for wind power generation with a vertical axis of the present invention; 
         FIG. 5  is a disassembled sectional view illustrating one of the independent energy transmissions of  FIG. 4 ; and 
         FIG. 6  is an assembled sectional view illustrating fixture joint members coupling a group of independent energy transmission vertical joints. 
     
    
    
     DESCRIPTION OF SYMBOLS OF THE MAIN PARTS IN THE DRAWINGS 
     
         
         
           
               10   a ,  10   b : joint rotary shaft  11   a ,  11   b : joint stud 
               12   a ,  12   b : joint journal 
               20   a ,  20   b : one-way bearing for joint rotary shaft 
               30   a ,  30   b : plain bearing  40   a ,  40   b : joint wind rotor 
               41   a ,  41   b ,  51   a ,  51   b : seat  42   a ,  42   b : cup-like blade 
               43   a ,  43   b : contact base  50   a ,  50   b : cradle tube 
               52   a ,  52   b : flange  61   a ,  61   b ,  360 : ball bearing 
               70   a ,  70   b : protective cover  80   a ,  80   b : support ring 
               100   a ,  100   b : independent energy transmission 
               200 : fixture joint member  10 : joint fixture tube 
               220 : fastener  221 : bolt 
               222 ,  223 : nut  230 : strut 
               240 : support  310 ,  320 : bevel gear 
               330 : rotational force transmission shaft 
               340 : one-way bearing for transmission shaft 
               350 : idle induction tube  400 : power relay shaft 
               500 : gear box  600 : power generator 
             A: independent energy transmission vertical joint group 
           
         
       
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     Reference will now be made in greater detail to an exemplary embodiment of the invention, an example of which is illustrated in the accompanying drawings. 
       FIG. 3  is a perspective view illustrating an apparatus for wind power generation with a vertical axis of the present invention.  FIG. 4  is a sectional view illustrating important parts of an apparatus for wind power generation with a vertical axis of the present invention.  FIG. 5  is a disassembled sectional view illustrating one independent energy transmission of  FIG. 4 .  FIG. 6  is an assembled sectional view illustrating a fixture for connecting a set of vertical joints in each independent energy transmission. 
     As illustrated, the apparatus for wind power generation with a vertical axis of the present invention comprises a plurality of independent energy transmissions, which are assembled with each other. 
     First, in order to assemble a first one  100   a  of the independent energy transmissions, a one-way bearing  20   a  for a first joint rotary shaft is press-fitted into the seat  41   a  of a joint wind rotor  40   a.    
     Here, the joint wind rotor  40   a , in which the one-way bearing  20   a  is fixed, is covered with a protective cover  70   a  over an upper portion thereof so as to prevent foreign materials such as rainwater from being introduced from the outside. 
     Further, the joint wind rotor  40   a  has four cup-like blades  42   a  fixed on the outer circumference thereof in a radial direction. Alternatively, the number of cup-like blades  42   a  can be set to three or five depending on the size of the independent energy transmission. 
     Then, a plain bearing  30   a  is placed in the seat  51   a  of a cradle tube  50   a , and then a ball bearing  61   a  is press-fitted into the plain bearing  30   a.    
     Next, a contact base  43   a  of the joint wind rotor  40   a  is fitted into the cradle tube  50   a  in which the plain bearing  30   a  is placed. Thereby, the plain bearing  30   a  is closely connected between the placed joint wind rotor  40   a  and the cradle tube  50   a . Thus, the joint wind rotor  40   a  is not in direct contact with the cradle tube  50   a , so that the joint wind rotor  40   a  can be independently rotated without interference from the cradle tube  50   a.    
     Subsequently, the joint rotary shaft  10   a  is inserted so as to pass through the placed one-way bearing  20   a  and the ball bearing  61   a  inside the plain bearing  30   a . Thereby, the assembly of the independent energy transmission is completed. Here, the joint rotary shaft  10   a  is also press-fitted into the one-way bearing  20   a.    
     The protective cover  70   a , which is covered over the upper portion of the joint wind rotor  40   a , is preferably fixed to the joint rotary shaft  10   a , passing therethrough, using a pin. 
     Further, the joint rotary shaft  10   a  passing through the ball bearing  61   a  is preferably fixed to a support ring  80   a  at a lower end thereof such that the ball bearing  61   a , fitted around the outer circumference of the joint rotary shaft  10   a , can firmly withstand external impacts. 
     In this manner, even if forward wind (counterclockwise wind), in the direction of which power generation force is provided, and reverse wind (clockwise wind), in the direction of which power generation force is not provided, blow at the same time, the assembled independent energy transmission  100   a  can generate electricity using only the forward wind, without interference from the reverse wind. 
     In other words, in the case in which the wind blows in a forward direction, the joint wind rotor  40   a  is rotated in a counterclockwise direction. At this time, the one-way bearing  20   a  is installed on the seat  41   a  of the rotating joint wind rotor  40   a , and thus is rotated therewith in a counterclockwise direction. 
     In this manner, when rotated in a counterclockwise direction, the one-way bearing  20   a  causes the joint rotary shaft  10   a  to rotate in a forward direction, which is the direction in which electricity is generated, because the joint rotary shaft  10   a , which is fixed to the inner circumference of the one-way bearing  20   a , is rotated in engagement with the one-way bearing  20   a.    
     In contrast, in the case in which the wind blows in a reverse direction, the joint wind rotor  40   a  is rotated in a clockwise direction. Thus, the one-way bearing  20   a , fixed to the rotating joint wind rotor  40   a , is rotated therewith in a clockwise direction. At this time, the one-way bearing  20   a  is not engaged with the joint rotary shaft  10   a , which is fixed to the inner circumference of the one-way bearing  20   a , because rotational force is transmitted in a counterclockwise direction. Hence, the one-way bearing  20   a  runs idle, so that it does not transmit rotational force to the joint rotary shaft  10   a . As a result, the efficiency of power generation is improved. 
     Afterwards, components constituting a second one  100   b  of the independent energy transmissions, i.e. a joint rotary shaft  10   b , a one-way bearing  20   b  for a second joint rotary shaft, a plain bearing  30   b , a joint wind rotor  40   b , a cradle tube  50   b , a ball bearing  61   b , a protective cover  70   b , and a support ring  80   b , are assembled with each other, as in the first independent energy transmission  100   a . Here, among the reference numerals that have not yet been described,  11   b  indicates a joint stud,  12   b  indicates a joint journal,  41   b  and  51   b  indicate seats,  42   b  indicates a cup-like blade, and  43   b  indicates a contact base. 
     Afterwards, a joint journal  12   a  is interposed between the joint rotary shaft  10   a  of the assembled first independent energy transmission  100   a  and the joint rotary shaft  10   b  of the assembled second independent energy transmission  100   b , and then the joint studs  11   a  and  11   b  of the joint rotary shafts  10   a  and  10   b  are inserted into opposite sides of the joint journal  12   a . At this time, each of the joint studs  11   a  and  11   b  is provided with a male spline on the outer circumference thereof, and the joint journal  12   a  is provided with a female spline on the inner circumference thereof. Thus, the joint studs  11   a  and  11   b  are journaled in the joint journal  12   a.    
     Here, in the case of the upper and lower joint studs  11   a , protruding from opposite ends of each joint rotary shaft  10   a , the lower joint stud  11   a  is longer than the upper joint stud  11   a . The lower joint stud  11   a  is so long that the upper joint stud  11   b  of the joint rotary shaft  10   b , disposed below the joint rotary shaft  10   a , is exposed to the outside when the joint journal  12   a  moves upwards in the state where the joint journal  12   a  is inserted into the joint rotary shafts  10   a  and  10   b . This enables easy maintenance and repair of the respective joint wind rotors  40   a  and  40   b.    
     Thereafter, as many independent energy transmissions as are needed are vertically joined through the above-described process. Thereby, a plurality of vertical joint groups A of independent energy transmissions is prepared. 
     At this time, fixture joint members  200  are horizontally coupled between the independent energy transmission vertical joint groups A such that the independent energy transmission vertical joint groups A are firmly fixed to each other. 
     To this end, the cradle tube  50   a  or  50   b  of each independent energy transmission  100   a  or  100   b  is provided with a flange  52   a  or  52   b  at one end thereof, and each fixture joint member  200  is provided with a joint fixture tube  210 , and is couple to struts  230 . The flange  52   a  or  52   b  of the cradle tube  50   a  or  50   b  of each independent energy transmission, constituting an independent energy transmission vertical joint group A, is brought into contact with a corresponding joint fixture tube  210 , and is then fixed by a fastener  220  having bolts  221  and nuts  222 . In this case, the number of joint fixture tubes  210  coupled between the independent energy transmission vertical joint groups A can be adjusted to correspond to the number of cradle tubes  50   a  and  50   b  of the independent energy transmissions constituting each independent energy transmission vertical joint group A. 
     Then, the joint fixture tubes  210 , which are coupled along the independent energy transmission vertical joint groups A, are fixedly coupled to struts  230  (for example, by fitting or screwing), so as to be more firmly supported to withstand impacts transmitted from the outside. Here, the number of struts  230  can be two, as illustrated in  FIG. 3 . In the case in which the number of independent energy transmission vertical joint groups A is high, the struts can be disposed between the independent energy transmission vertical joint groups A at predetermined intervals. 
     Further, a support  240  is additionally disposed under the joint fixture tube  210  of the fixture joint member  200  such that the flange  52   a  or  52   b  of the cradle tube  50   a  or  50   b  can be firmly fixed to the joint fixture tube  210  of the fixture joint member  200 , and is fixed by a fastener  220  having bolts  221  and nuts  222 . In this case, the support  240  is provided with a through-hole, through which the joint rotary shaft  10   a  or  10   b  passes. 
     Afterwards, the joint rotary shaft  10   b  of the lowermost one  100   b  among the independent energy transmissions  100   a  and  100   b  constituting each independent energy transmission vertical joint group A is connected with a rotational force transmission shaft  330  using the joint journal  12   b.    
     A one-way bearing  340  for the transmission shaft is press-fitted around the joint rotary shaft  10   b , and then the press-fitted one-way bearing  340  is again fitted into an idle induction tube  350 . Then, the idle induction tube  350  is coupled to a first bevel gear  310  on one side thereof. 
     Here, the reason that the one-way bearing  340  and the idle induction tube  350  are interposed between the joint rotary shaft  10   b  and the first bevel gear  310  is to maximize the efficiency of power generation by, in the case in which at least one of the independent energy transmission vertical joint groups A is stopped because there is no forward wind, and in which the others are rotated in a forward direction because there is forward wind, preventing rotational force transmitted from the other independent energy transmission vertical joint groups A from being used to rotate the stopped independent energy transmission vertical joint group A. 
     In other words, the outer circumference of the one-way bearing  340  is fitted into the inner circumference of the idle induction tube  350 , and the first bevel gear  310  is coupled to one side of the idle induction tube  350 . Thereby, when the rotational force transmission shaft  330 , connected with the joint rotary shaft  10   b , is rotated in a forward direction by the forward rotational force transmitted from the independent energy transmission vertical joint groups A, the one-way bearing  340  fitted around the rotational force transmission shaft  330  is engaged and rotated together, and thus the first bevel gear  310  is rotated. 
     In contrast, when the rotational force transmission shaft  330 , connected with the joint rotary shaft  10   b  of any independent energy transmission vertical joint group A, is stopped, the idle induction tube  350 , coupled with the first bevel gear  310 , is rotated in a forward direction by the rotational force transmitted from the other independent energy transmission vertical joint groups A. At this time, the one-way bearing  340  fixed to the inner circumference of the idle induction tube  350  runs approximately idle relative to the idle induction tube  350 , so that no rotational force is transmitted from the idle induction tube  350  to the joint rotary shaft  10   b . In this manner, because the transmitted rotational force is used to rotate the idle induction tube  350 , the efficiency of power generation can be improved. 
     A ball bearing  360  is fitted around one end of the rotational force transmission shaft  330 , so that the rotational force transmission shaft  330  can be more smoothly rotated. Thereafter, the rotational force transmission shaft  330 , the one-way bearing  340  for the transmission shaft, the idle induction tube  350 , and the first bevel gear  310  are installed on the other independent energy transmission vertical joint groups A. 
     Afterwards, a power relay shaft  400  passes through each second bevel gear  320 , which is engaged with each first bevel gear  310 . The power relay shaft  400  is coupled to a gear box  500  at one end thereof, and the gear box  500  is coupled to a power generator  600 . 
     Here, the power generator  600  is electrically connected with a storage battery (not shown), so that the electricity generated from the power generator can be accumulated. Further, the gear box  500  can use various gears, for instance, spur gears. Alternatively, a plurality of power generators  600  may be installed. In this case, the number of power generators can be increased in proportion to the number of independent energy transmission vertical joint groups A. Further, each pair of bevel gears  310  and  320  and the gear box  500  are mounted in corresponding housings, to protect them from external impacts as well as the introduction of foreign materials. Furthermore, each housing is preferably provided therein with ball bearings such that the coupled gear and shaft can be smoothly rotated. 
     In this manner, the independent energy transmission vertical joint groups A, each of which has the independent energy transmissions  100   a  and  100   b  coupled vertically to each other, are arranged in a horizontal direction. Thereby, the joint wind rotors  40   a  and  40   b  are regularly disposed longitudinally and transversely, that is, in a matrix arrangement. 
     According to the apparatus for wind power generation with a vertical axis, having this structure, of the present invention, due to the special climate environment in Korea, when a forward wind W 1  blows in the direction in which electricity is generated (herein, a counterclockwise direction from the front to the rear of each independent energy transmission vertical joint group A) at a right lower portion of the cuboid in which the joint wind rotors  40   a  and  40   b  are regularly disposed in a matrix arrangement and simultaneously, when a reverse wind W 2  blows in a direction in which no electricity is generated (herein, a counterclockwise direction from the rear to the front of each independent energy transmission vertical joint group A) at a left upper portion of the cuboid, each joint wind rotor  40   a  is rotated in the counterclockwise direction at the portion where the forward wind W 1  blows. 
     At this time, each one-way bearing  20   a , fixed to the inner circumference of each joint wind rotor  40   a , is rotated in the counterclockwise direction, so that each joint rotary shaft  10   a , engaged when each joint wind rotor is rotated in the forward direction, is also rotated in the forward direction. 
     Further, the rotational force transmission shaft  330  is fixedly coupled to the lowermost one  10   b  of the joint rotary shafts, and is sequentially coupled with the one-way bearing  340 , the idle induction tube  350 , into which the one-way bearing  340  is press-fitted, and the first bevel gear  310 . Thus, the one-way bearing  340  coupled to the rotational force transmission shaft  330  is rotated in engagement with the rotational force transmission shaft  330  when it is rotated in the forward direction, so that the idle induction tube  350 , into which the one-way bearing  340  is press-fitted, and the first bevel gear  310  are also rotated in the forward direction. 
     The first bevel gear  310  is engaged with the second bevel gear  320 , through which the power relay shaft  400  is fixed, and one end of the power relay shaft  400  is coupled to the gear box  500 . Thereby, the transmitted rotational force causes the power relay shaft  400  to be rotated together with the gear box  500 , so that the power generator  600  coupled with the gear box  500  can generate the electricity. The generated electricity can be accumulated in the storage battery through conductive wires. 
     The other joint wind rotors  40   b  are rotated in a clockwise direction by the reverse wind W 2 . At this time, the one-way bearing  20   b , fixed to the inner circumference of each of the other joint wind rotors  40   b , is also rotated in a clockwise direction. In this case, when rotated in a reverse direction, each one-way bearing  20   b  runs idle without engaging any of the other joint rotary shafts  10   b . Thus, none of the other joint wind rotors  40   b  transmit any rotational force to any of the other joint rotary shafts  10   b , thereby providing no interference to any of the joint rotary shafts  10   a , which rotate in the forward direction. 
     Meanwhile, as described above, in the case of the existing vertical axial wind generator, when the winds W 1  and W 2  blow at the same time, it is impossible for the wind rotors thereof to rotate from a mathematical standpoint. However, in the case of the inventive vertical axial wind generator, if the maximum efficiency of rotation is 100%, the wind rotors can rotate at least 50% efficiency from a mathematical standpoint. In this manner, it can be found that the efficiency of power generation of the inventive vertical axial wind generator is improved over that of the existing vertical axial wind generator. 
     Moreover, in the case of the existing apparatus for wind power generation having a vertical axis, when the forward wind W 1  and the reverse wind W 2  blow at the same time, each wind rotor is not rotated due to the intensity (or the external force) of the concurrent winds, and is twisted by the external force. 
     In the case in which this situation persists, the joint that connects the rotary shaft, which is unstable from the standpoint of the energy level, with the wind rotors has a high probability of fatigue failure. In contrast, in the case of the inventive apparatus for wind power generation with a vertical axis, the rotational force transmitted by the reverse wind is not transmitted to the joint rotary shaft  10   b , and is dissipated by the idling of the wind rotor  40   b , so that the occurrence of fatigue failure is minimized, unlike the existing apparatus for wind power generation with a vertical axis. 
     Even when any one of the independent energy transmission vertical joint groups A is stopped, only the idle induction tube  350  having the one-way bearing  340  relaying the rotational force between the independent energy transmission vertical joint groups A and the power generator  600  runs idle, so that the rotational force transmitted from the other independent energy transmission vertical joint groups A is prevented from rotating the stopped independent energy transmission vertical joint group A, and thus the efficiency of power generation is kept optimal.