Patent Publication Number: US-2022212735-A1

Title: Crawler driving device

Description:
BACKGROUND OF THE INVENTION 
     The invention belongs to the technology field of agriculture machinery equipment, in particular to a crawler driving device. 
     Track is a kind of traditional driving device, with history of more than 200 years since its invention. As excellent traction ability, mobility and stability, it is still a basic form of driving device. At present, the crawler driving device is not only used in agriculture tractor, but also mainly used in rice harvester, military vehicles, construction machinery, etc. 
     The traditional crawler driving device has the following drawbacks: the roller set is a two-row structure, with a high pressure on each roller wheel and poor stability of the overall structure; The rubber track structure is relatively simple, single-tooth structure located in the middle of the rubber track, easy to cause uneven force on the both sides, thus causing damage to the track; the roller wheels are fixed on the track bracket, where there is an obstacle on the ground, the roller wheels bump transmit the impact force received to the machine body, thus causing the machine shake and uncomfortable to driver. 
     BRIEF SUMMARY OF THE INVENTION 
     The invention provides a crawler driving device, to solve these problems that mentioned in the above background technology, these problems respectively are the high pressure on roller wheel, uneven pressure on rubber track, and causes the machine body&#39;s shake. 
     The technical problems solved by the invention are realized by the following technical solutions: 
     A crawler driving device, includes the main frame, the driving wheel that rotationally set over the main frame, the idler wheels that set at the both ends of the main frame, couple of roller wheels under the main frame at intervals along the driving direction of the crawler driving device, and the track that set at the outside of the driving wheel, the idler wheels and the roller wheels. wherein, the described main frame ( 10 ) includes beam ( 11 ), V-shaped brackets ( 12 ) that linked with the both sides of the beam ( 11 ) respectively, connecting rod ( 13 ) that connected the both V-shaped brackets ( 12 ), the space that is formed by V-shaped brackets ( 12 ) is used to accommodate the driving wheel ( 20 ); Described idler wheels include the guide rods that set at the both ends of the frame body, the rotating shafts that set at the end of the guide rod, and idler wheels that mounted on the both sides of the rotating shaft. Described each roller set includes the mechanical balancer, the roller wheels that rotationally connected with the both ends of mechanical balancer, The center position of the mechanical balancer rotating connected with the bottom of the main frame body. The teeth that set on the inner wall of the track engage with the driving wheel, roller wheels enable rubber track to move. 
     Preferably, using pin ( 70 ) to link the middle position of the both sides of the beam ( 11 ) with the bottom of V-shaped brackets ( 12 ). 
     Further preferably, setting restriction plates ( 14 ) in the middle position of the both sides of the beam ( 11 ) to limit the swing angle of the V-shaped brackets ( 12 ) 
     Preferably, the idler wheels rotationally set at the two ends of the main frame body and thus support the track, the idler wheels include the front guide idler wheel and the rear idler wheel. 
     Preferably, the mechanical balancer rotationally install at the bottom of the both sides of the main frame by pin. 
     Further preferably, The mechanical balancer includes the plate, the upper bearing seat that assembled at the bottom of the both end of the plates, the lower bearing seat which using with the upper bearing seat together and form a through-hole between the upper and the lower bearing seat, The through-hole used for inserting the rotating shaft, and the roller wheels assembled at the both sides of the rotating shaft. 
     Preferably, the 3 rows teeth on the inner wall of the rubber track, respectively are the first row teeth ( 511 ) the second row teeth ( 512 ) the third row teeth ( 513 ). 
     Further preferably, setting some teeth that used for mud cleaning at the both side of the inner wall of rubber track 
     Preferably, Including the tension mechanism, described tension mechanism includes the hydro-cylinder mounted on the connecting rod ( 13 ) over the upper idler wheels, and the tension idler that rotationally linked with hydro-cylinder. 
     The beneficial effect of the invention are: 
     1. The invention is mainly applied to the ground with poor operating condition, which increasing ground contact area, not only effectively prevent machine&#39;s subsidence, but also protect the field from damage. 
     2. The three-row teeth track structure in the invention deliver uniformly force on track and thus prolong the rubber track&#39;s life. 
     3. The roller wheels, idler wheels and tensioners in the invention all adopt four-row wheels structure, lowering the pressure on the each wheel and greatly improve the overall stability of the equipment. 
     4. The balancing structure of the roller wheels in the invention, absorbing vibration when the crawler driving device run into the obstacles, and thus ensuring the machine&#39;s smoothly driving. 
     5. The track in the invention is made of rubber, and has the advantages of stable moving, low noise and economic fuel consumption. 
     6. The double tensioning structure in the invention take advantage of even force distribution and more reliable. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  the layout drawing of the overall structure of the invention 
         FIG. 2  the structural layout drawing without rubber track of the invention 
         FIG. 3  the top view of the connection between the main frame and the roller wheels 
         FIG. 4  the 3D of the main frame in the invention 
         FIG. 5  the structural drawing of the roller wheels in the invention 
         FIG. 6  the structural drawing of the mechanical balancer in the invention 
         FIG. 7  the drawing of the inside of rubber track in the invention 
         FIG. 8  the structural drawing of the tensioning mechanism in the invention 
     
    
    
     Wherein,  10 —the main frame  11 —beam  12 —V-shaped brackets  13 —connecting rod
       14 —restriction plate  15 —fixed plate  17 —connecting bracket  20 —driving wheel     21 —rotating fluted disc  22 —side plate  23 —rotating disc  24 —connecting bar     30 —Idler wheels  301 —front idler wheel  302 —rear idler wheel     31 —guide rod  32 —the first rotating shaft  33 —Idler wheel  40 —Roller set     41 —Mechanical balancer  411 —plate  412 —upper bearing seat  413 —lower bearing seat     414 —the third through hole  415 —the fourth through hole  42 —Roller wheel  50 —track  51 —teeth  511 —the first row teeth  512 —the second row teeth  513 —the third row teeth  52 —tooth that used for mud cleaning  60 —tension mechanism  61 —Hydro-cylinder  62 —Idler wheel  63 —supporting bracket  70 —pin   

     DETAILED DESCRIPTION OF THE INVENTION 
     In order to further explain the technical solutions of the invention, the following is a detailed elaboration of the invention through specific embodiments. 
     It should be noted that in the embodiments “both sides” is the left and right directions along the driving direction of the crawler driving device, “both ends” is the front and rear directions along the driving direction of the crawler driving device. 
     As shown in  FIG. 1-8 , the invention relates to a crawler driving device, includes the main frame  10 , driving wheel  20 , idler wheels  30 , roller wheels  40 , track  50  and tensioning mechanism  60   
     As shown in  FIG. 1 , the driving wheel  20  rotationally set over the main frame  10  and contact with track  50 , and the driving wheel  20  is over the middle position of the main frame along the front and rear directions of the crawler driving device, the idler wheels  30  mounted on the both ends of the main frame  10 , couple of roller wheels  40  installed under the both sides of frame body along the driving direction of the crawler driving device, rubber track  50  set at the outside of the driving wheel  20  idler wheels  30  roller wheels  40  and tensioning mechanism  60 , the teeth on the inner wall of the rubber track  50  engage with driving wheel  20 , enabling driving wheel drive rubber track to move. 
     As shown in  FIG. 2 , Described main frame ( 10 ) includes beam ( 11 ), V-shaped brackets ( 12 ) that linked with the both sides of the beam ( 11 ) respectively, connecting rod ( 13 ) that connected the top of the one V-shaped bracket ( 12 ) with the top of the other V-shaped bracket ( 12 ); the space that is formed by V-shaped brackets ( 12 ) is used to accommodate the driving wheel ( 20 ); linking the middle position of the both sides of the beam ( 11 ) with the bottom of V-shaped brackets ( 12 ) by pin ( 70 ). 
     Setting restriction plate ( 14 ) in the middle position of the both sides of beam ( 11 ) in order to limit the swing angle of the V-shaped brackets ( 12 ). 
     As shown in  FIG. 4 , the beam  11  is composed of three same supporting plates that set at intervals, the both ends of the three supporting plates respectively fixed with plate  15  into a whole, connecting bracket  17  that connect with the thrust wheel groups  40  is set at the bottom of supporting plates (As shown in  FIG. 3 ) 
     As shown in  FIG. 2 , the driving wheel  20  includes the rotating fluted disc  21 , the side plate  22 , the rotating disc  23  the connection bar  24 . 
     The side plate  22  uniformly distributed and inserted in the teeth of the rotating fluted disc  21 , the rectangular notch at the bottom of the side plate  22  stuck out the center of the teeth and perpendicular to the teeth, two rotating disc  23  separately insert in the symmetrical notch at top of the side plate  22 , the rotating disc  23  is perpendicular to the side plate  22  and parallel to the rotating fluted disc  21 , and the center of two rotating disc is coincident, some holes uniformly set on the two rotating discs  23  and the position of holes in the two rotating disc is same, the connection bar  24  respectively inserted in the corresponding holes of the two rotating discs  23 , when walking device works, the connection bar  24  drive the teeth  51  of the inner wall of track  50 , thus drive track  50  to walk. 
     As shown in  FIG. 3 , the idler wheels  30  include guide rod  31  mounted on fixed plate  15 , the other end of guide rod  31  rotating connect with the first rotating shaft  32 , the both sides of the first rotating shaft  32  separately connect with two idler wheels  33 . 
     The idler wheels in the invention is composed of the front idler wheel  301  and the rear idler wheel  302 , separately assembled at the front and rear of the beam  11 . 
     As shown in  FIG. 2   FIG. 5   FIG. 6 , there are 4 roller wheel sets, separately rotationally assembled at the bottom of the both sides of the main frame by pin  70 , each roller wheel  40  includes mechanical balancer  41 , the roller wheel  42  rotating connect with the both ends of the mechanical balancer  41 . 
     As shown in  FIG. 6 , The mechanical balancer  41  includes the plate  411 , the upper bearing seat  412  that assembled at the bottom of the both ends of the plates  411 , the lower bearing seat  413  that using with upper bearing seat together and form a through-hole  414  between the upper bearing seat and the lower bearing seat, the through-hole  414  used for inserting the second rotating shaft (not show in picture), and the roller wheels  42  assembled at the both sides of the second rotating shaft, and the roller wheels  42  is at the both sides of the plates  411 . 
     Setting the fourth through hole  415  at the top of the middle of the plate  411 , which link with the connecting bracket  17  by pin  70 . 
     There are 4 roller wheels  42  for each roller set in the invention. 
     As shown in  FIG. 7 , the teeth  51  uniformly distributed on the inner wall of the track  50 , Set 3 rows teeth ( 51 ) on the inner wall of the rubber track ( 50 ), respectively are the first row teeth ( 511 ) the second row teeth ( 512 ) the third row teeth ( 513 ); the driving device works, the teeth  51  engage with the driving wheel  20 , the driving wheel  20  drive the 3 rows teeth  51  and then the track  50  to rotate, the design of 3 rows teeth  51  make more even force on the track, and effectively improve the force distribution on track  50 , and prolong the rubber track  50  life. 
     There are same interval space  53  during 3 rows teeth, the interval space  53  can accommodate the two middle wheels of the idler wheels  30  the roller wheels  40  and the tensioners  60   
     Setting some teeth  52  at the two ends of the inner wall of the rubber track  50 , and distributed at same interval, the shape of tooth  52  is similar to pyramid make the mud to easily drop from the track  50  and thus achieve the effect of cleaning. 
     As shown in  FIG. 2   FIG. 8 , the tension mechanism  60  includes hydro-cylinder  61 , tension wheel group  62 , the one end of the hydro-cylinder  61  fixed on the connection rod  13  by supporting bracket  63 , the other end link with tensioned  62  by pin. 
     The Implement Process of the Invention 
     The V-shaped bracket  12 , driving wheel  20  is installed on driving axle of the machine, when the driving axle turn, the driving wheel move as well, driving wheel  20  engage with the teeth of inner wall of the rubber track, thereby drive track  50  to move, the roller set swing up and down during moving, and also supporting frame for the crawler driving device. The roller wheel at the both sides of the main frame can swing up and down with taking the rotating shaft  416  in the middle of the oscillating deck as fulcrum. when the crawler driving device run into obstacles, the four roller wheel sets at the both ends of the mechanical balancer buffers force synchronously, thus ensure smoothly drive. the idler wheels mainly play guiding role, the tension mechanism achieves tensioning adjustment between track and wheel groups under the action of the hydro-cylinder. 
     The above embodiments of the invention are described in detail, but the contents are only the better embodiments of the invention and should not be considered as limiting the scope of implementation of the invention, any equal changes and improvement made in accordance with the scope of the invention remain within the scope of the invention patent.