JP5893388B2 - Semi-crawler tractor - Google Patents

Description

  The present invention relates to a semi-crawler tractor that supports a front side of a fuselage with wheels and supports a rear side of the fuselage with a crawler.

  A semi-crawler tractor is known in which the front side of the aircraft is supported by wheels and the rear side of the aircraft is supported by crawlers (see, for example, Patent Document 1). Normally, in this type of semi-crawler tractor, a track frame provided with idle wheels and wheels is supported so as to be swingable up and down in order to improve the followability of the crawler with respect to the ground. For example, in a semi-crawler tractor disclosed in Patent Document 1, a swing support shaft is pivotally supported at a position below a rear axle of a rear axle case, and a track frame is supported by the swing support shaft so as to be swingable up and down.

Japanese Patent No. 3410962

  By the way, in a semi-crawler tractor that supports the track frame so as to be able to swing up and down, it is necessary to limit the vertical swing of the track frame within a predetermined range. Since a member for restricting the movement is provided and the vertical swing range of the track frame is restricted between the two members, there is a problem that the number of parts increases and the cost increases. In addition, since the shape of the rear axle case and the track frame is complicated, there is a problem that the attached mud is difficult to drop and the maintainability such as cleaning and maintenance is deteriorated.

The present invention was created in view of the above-described circumstances in order to solve these problems. The invention of claim 1 includes left and right rear axles rotatably supported by a rear axle case. A driving wheel attached to the left and right rear axles, a swinging support shaft supported at a position below the rear axle of the rear axle case, and a swingable support shaft supported by the swinging support shaft via a holder. A semi-comprising track frame, front and rear idler wheels provided on the track frame, a wheel provided between the front and rear idler wheels, and a crawler wound around the drive wheel, the idler wheel and the wheel. in crawler tractor, the facing portion of the said rear axle case holder is provided with a contact portion that Setto from each other in the left-right across the swing shaft together respectively, by Setto between both contact portion Upon configured to limit the vertical movement range of the serial track frame, abutment between the abutment of the left and right rear axle case side is semi-crawler tractor, characterized in that has a straight line.
The invention according to claim 2 is characterized in that the rear accelerator case is provided with a surface corresponding to the left and right contact surfaces as a shape which is symmetrical with respect to a symmetry line passing through the rear axle. The semi-crawler tractor.

According to the first aspect of the present invention, the contact portions that come into contact with each other are integrally provided at the opposing portions of the rear axle case and the holder, and the vertical swing range of the track frame is limited by the contact between the contact portions. As a result, the number of parts can be reduced and the cost can be reduced as compared with the conventional one in which the rear axle case and the track frame are each provided with a swing restricting member. Further, since the shape of the rear axle case and the track frame can be simplified, not only the adhering mud easily falls, but also maintainability such as cleaning and maintenance can be improved.
According to the second aspect of the present invention, the shaft supporting tube portions of the left and right rear axles can be made common, and the surface corresponding to the contact portion can be used as a mounting portion for the safety frame or the cabin.

It is a side view of a semi crawler tractor concerning an embodiment of the present invention. It is a principal part rear view of the semi-crawler tractor which concerns on embodiment of this invention. It is a back sectional view of a rear axle case of a semi-crawler tractor and a crawler device concerning an embodiment of the present invention. It is a side view which shows the crawler apparatus of the semi-crawler tractor which concerns on embodiment of this invention. It is a side view which shows the crawler apparatus support part (drive wheel omission) of the semi-crawler tractor which concerns on embodiment of this invention. It is a perspective view which shows the crawler apparatus support part (driving wheel omission) of the semi-crawler tractor which concerns on embodiment of this invention. It is a disassembled perspective view which shows the crawler apparatus support part (driving wheel omission) of the semi-crawler tractor which concerns on embodiment of this invention. It is a side view which shows the crawler apparatus support part (a drive wheel and a holder abbreviate | omitted) of the semi-crawler tractor which concerns on embodiment of this invention. It is a principal part back sectional view side view showing the drive wheel of the semi crawler tractor concerning the embodiment of the present invention. (A) is a side view which shows the drive wheel (disk and wheel) of the semi-crawler tractor which concerns on embodiment of this invention, (B) is back sectional drawing. It is a figure which shows the crawler apparatus of the semi-crawler tractor which concerns on embodiment of this invention, and is a top view which shows the frame structure of a crawler apparatus. It is a figure which shows the crawler apparatus of the semi-crawler tractor which concerns on embodiment of this invention, and is the side view which added the scraper. It is a figure which shows the crawler apparatus of the semi-crawler tractor which concerns on embodiment of this invention, (A) is a top view of a track frame, (B) is a side view, (C) is a front view, (D) is a rear view. is there. It is a figure which shows the crawler apparatus of the semi-crawler tractor which concerns on embodiment of this invention, and is a partial cross section side view which shows the tension adjustment structure of a crawler apparatus. It is a figure which shows the differential lock structure of the semi-crawler tractor which concerns on embodiment of this invention, (A) is a principal part front view of a rear axle case, (B) is principal part sectional drawing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a semi-crawler tractor. The semi-crawler tractor 1 includes an engine mounting portion 2 on which an engine (not shown) is mounted, a transmission case 3 for shifting engine power, A front axle case (not shown) that supports the front axle (not shown) of the vehicle, a front wheel 4 attached to the front axle, a rear axle case 6 that supports the left and right rear axles 5, and a rear axle case 6 are attached. The crawler device 7 is configured to include a work machine connection unit 8 to which a work machine (not shown) is connected, and a control unit 9 on which an operator gets on.

  The crawler device 7 includes a drive wheel 10 attached to the left and right rear axles 5, a swinging support shaft 11 that is pivotally supported at a position below the rear axle of the rear axle case 6, and a vertical movement of the swinging support shaft 11 via a holder 12 A track frame 13 supported in a swingable manner, front and rear idle wheels 14 and 15 provided on the track frame 13, a rolling wheel 16 provided between the front and rear idle wheels 14 and 15, a drive wheel 10 and idle wheels 14 15 and a crawler 17 wound around the roller wheel 16, and the crawler 17 is driven in accordance with forward and reverse rotation of the drive wheel 10 to advance the semi-crawler tractor 1 forward and backward.

  Next, the support part of the crawler device 7 will be described with reference to FIGS. As shown in these drawings, an outer end portion of the rear axle case 6 is provided with a shaft support tube portion 6a for supporting the rear axle 5. The swing support shaft 11 is pivotally supported by an outer bracket 18 and an inner bracket 19 attached to the rear axle case 6, and supports the holder 12 at an intermediate portion thereof so as to be rotatable. Here, the outer bracket 18 is a shaft support member attached to the lower surface of the distal end portion of the shaft support tube portion 6 a of the rear axle case 6, and the inner bracket 19 is disposed below the base end portion of the shaft support tube portion 6 a of the rear axle case 6. A shaft support member to be attached.

In the semi-crawler tractor 1 that supports the track frame 13 so as to be swingable up and down as described above, it is necessary to limit the vertical swing of the track frame 13 within a predetermined range. Therefore, in the semi-crawler tractor 1 according to the embodiment of the present invention, as shown in FIG. 5 and the like, the facing portions 6b, 6c, 12a, and 12b that are in contact with each other are opposed to the opposing portions of the rear axle case 6 and the holder 12, respectively. The track frame 13 is configured so as to limit the vertical swing range of the track frame 13 by the contact between the contact portions 6b, 6c, 12a, and 12b. As apparent from FIG. 5, the contact portions 6 b, 6 c, 12 a, and 12 b of the rear axle case 6 and the holder 12 are formed on the left and right sides of the swing support shaft 11.

  For example, the contact portion 6b formed on the front side of the lower surface of the shaft supporting tube portion 6a of the rear axle case 6 and the contact portion 12a formed on the front side of the upper surface of the holder 12 are moved upward in the front side of the track frame 13. The track frame is limited by the contact between the contact portion 6c formed on the rear side of the lower surface of the shaft supporting tube portion 6a of the rear axle case 6 and the contact portion 12b formed on the rear side of the upper surface of the holder 12 while restricting the swing. 13 swings upward on the rear side.

  In this case, the number of parts can be reduced and the cost can be reduced as compared with the conventional one in which the rear axle case 6 and the track frame 13 are each provided with the swing restricting member. Further, since the shapes of the rear axle case 6 and the track frame 13 can be simplified, not only the adhering mud easily drops, but also maintainability such as cleaning and maintenance can be improved.

In the present embodiment, the shaft support tube portion 6a of the rear axle case 6 is symmetric with respect to the line AA shown in FIG. 5, and the shaft support tube portions 6a of the left and right rear axles 5 are shared. As a result, surfaces 6d and 6e corresponding to the contact portions 6b and 6c are also provided on the rear surface of the shaft support tube portion 6a. The rear mounting member 20 is attached to these surfaces 6d and 6e, and safety is ensured. It can be used as a mounting portion for the frame 21 and a cabin (not shown). Incidentally, as is apparent from FIG. 5, a straight rear mounting member 20 is provided on the surfaces 6d and 6e which are symmetrical with respect to the contact portions 6b and 6c.

  As shown in FIGS. 2 and 3, the inner brackets 19 attached to the left and right sides of the rear axle case 6 are integrally connected via a connecting frame 22. The connection frame 22 of the present embodiment is a member provided with a lower link support shaft 23 that is a component of the work machine connection unit 8, and by connecting the left and right inner brackets 19 using this member, the number of parts can be increased. Reduction and simplification of the structure can be achieved.

  Further, as shown in FIG. 2, a grease plug 24 is attached to the outer peripheral surface of the holder 12 toward the rear side, and the outer peripheral surface of the swing support shaft 11 and the inner surface of the holder 12 are connected via the grease plug 24. Grease is performed between the peripheral surface. If it does in this way, it will become possible to perform the grease supply with respect to between the rocking | fluctuation spindle 11 and the holder 12 easily from the body rear side of the semi-crawler tractor 1. In particular, in the present embodiment, as shown in FIG. 2, the greasing plug 24 is disposed on the inner side of the inner width B of the crawler 17 of the left and right crawler devices 7, so that the crawler device 7 interferes with the greasing. Can also be prevented.

  Next, the configuration of the drive wheel 10 will be described with reference to FIGS. 9 and 10. As shown in these drawings, the drive wheel 10 is mounted between the disc 25 attached to the flange portion 5a of the rear axle 5, the left and right wheels 26 fixed to the outer periphery of the disc 25, and the left and right wheels 26. And a plurality of pins 27 that engage with the drive protrusions 17 a of the crawler 17.

  Since the disk 25 and the wheel 26 are manufactured by punching or cutting from a steel plate, there is a problem that the yield rate is low and the manufacturing cost increases. In particular, when manufacturing the wheel 26, all the remaining members on the inner peripheral side of the wheel caused by punching or cutting are wasted, which has been a factor in yield reduction.

  Therefore, the wheel 26 according to the embodiment of the present invention is formed in an annular shape by punching or cutting from a steel plate, and has a plurality of convex portions 26a arranged at predetermined intervals in the circumferential direction on the inner peripheral portion. The disk 25 is formed of a remaining member on the inner peripheral side of the wheel generated by punching or cutting of the wheel 26, and has a plurality of convex portions 25a arranged at predetermined intervals in the circumferential direction on the outer peripheral portion. is there. The wheel 26 and the disk 25 are configured integrally by superimposing the convex portions 26 a and 25 a in a side view and fixing them by welding via a connecting member 28.

  If it does in this way, since disk 25 is formed from the remaining member by the side of the wheel inner circumference produced by punching or cutting, a yield can be improved and manufacturing cost can be reduced. Moreover, since the wheel 26 and the disk 25 are integrally formed by superimposing and fixing the convex portions 26a, 25a in a side view, the strength required for the drive wheel 10 can be easily ensured. .

  Further, the disk 25 of the present embodiment is configured by overlapping two plates 25b obtained from the remaining members when the left and right wheels 26 are formed. In this way, not only the strength of the disk 25 can be increased, but also the yield can be further improved.

  Further, in the present embodiment, when the two plates 25b are overlapped to form the disk 25, the two plates 25b are slightly shifted in the circumferential direction, and the required step strength is obtained by welding the resulting stepped portion. Secured. In addition, although the fitting hole 25c fitted to the convex part 5b of the flange part 5a is formed in the center part of the plate 25b, the chamfered part 25d is formed in the edge part of the one side of the fitting hole 25c of each plate 25b. Then, by overlapping and joining the plates 25b so that the chamfered portions 25d face outward, the chamfered portions 25d are formed at the edges on both sides of the fitting holes 25c.

  A semicircular pin mounting portion 26b is formed on the outer peripheral portion of the left and right wheels 26 so as to project at a predetermined interval. The pin 27 of the present embodiment has a cylindrical shape, is fitted into a bolt 29 spanned between the pin mounting portions 26 b of the left and right wheels 26, and is fastened between the left and right wheels 26 by a nut 30. ing.

  Further, between the head portion of the bolt 29 and the pin mounting portion 26b of the wheel 26 and between the nut 30 and the pin mounting portion 26b of the wheel 26, the outer side is rounded, and the outer periphery is the pin 27 and the pin. A washer 31 that is substantially flush with the outer periphery of the mounting portion 26b is interposed. In this way, the drive wheel 10 itself can be rounded at a portion of the drive wheel 10 that may come into contact with the crawler 17 without any special processing. The crawler can be prevented from being damaged, and as a result, the drive wheel 10 suitable for a rubber crawler without a core can be manufactured at low cost.

  Next, the frame structure of the crawler device 7 will be described with reference to FIGS. As shown in these drawings, the track frame 13 includes a holder fixing plate 33 fixed by a plurality of bolts 32 along the lower surface of the holder 12, and a parallel arrangement spaced apart in the front-rear direction on the lower surface of the holder fixing plate 33. The front and rear support plates 34 and 35 to be welded to each other, the wheel mounting frame 36 to be welded to the outer end portions of the front and rear support plates 34 and 35, and the front idler to be welded to the front upper surface of the wheel mounting frame 36. A wheel mounting pipe 37 and a rear idler wheel mounting bracket 38 welded to the rear rear surface of the wheel mounting frame 36 are provided.

  In the track frame 13 according to the embodiment of the present invention, the reinforcing plate 39 is welded between the front and rear support plates 34 and 35 in order to increase the strength. An oval-shaped mud removal hole 39a having a large area is formed. In this way, not only can the reinforcing plate 39 be attached between the front and rear support plates 34 and 35 attached to the lower surface of the holder 12 to increase the support strength of the track frame 13, but the mud holes 39 a of the reinforcing plate 39 can be used. Mud and water accumulation can also be prevented, and car washing after work can be facilitated.

  The outer ends of the front and rear support plates 34 and 35 are positioned between the wheels 16 in a side view, and mounting holes 34a and 35a for mounting the wheel scrapers 40 are provided. That is, since the front and rear support plates 34 and 35 are also used as mounting members for the wheel scraper 40, it is possible to reduce the number of parts and reduce the cost compared to the case where a dedicated mounting member is separately provided. .

  Further, in the present embodiment, the side plate 36a on the inner side of the wheel mounting frame 36 is raised so as to be close to the outer periphery of the driving wheel 10, and the rising portion 36b functions as a scraper that scrapes off mud adhering to the driving wheel 10. It is like that. In this way, mud adhering to the drive wheel 10 can be scraped off without providing a dedicated scraper member, so that the number of parts can be reduced and the cost can be reduced. Further, the mud scraped off by the rising portion 36b may fall on the reinforcing plate 39. However, since it falls to the ground via the mud hole 39a of the reinforcing plate 39, there is a disadvantage that mud pool is generated. Absent. In the present embodiment, the upper end shape of the rising portion 36b is an arc shape along the outer periphery of the drive wheel 10, but the upper end shape of the rising portion 36b can be changed as appropriate.

  In the present embodiment, the front support plate 34 faces the rear end of the mounting pipe 37, and one end of the tension bolt 41 that tensions the front idler wheel 14 is supported by the front support plate 34. If it does in this way, compared with the case where the end of tension bolt 41 is supported by a member for exclusive use, reduction of a number of parts and simplification of a structure can be aimed at.

  The front idler wheel 14 is attached to a mounting bracket 42, and a nested pipe 43 extending rearward from the mounting bracket 42 is fitted into the mounting pipe 37 so as to be slidable back and forth. A nut 44 is non-rotatably provided at the rear end portion of the nested pipe 43, and the front end side of the tension bolt 41 is screwed to the nut 44. The rear end side of the tension bolt 41 is pressed against the front support plate 34 via the washer 45 so as to receive the load of the crawler 17.

  Further, a nut 46 is attached to the rear end of the tension bolt 41 so as to pass through the front support plate 34 so as to be rotatable and to rotate integrally by fitting the two chamfered portions. When the nut 46 is turned with a tool, the front idler wheel 14 moves forward and backward with the rotation of the tension bolt 41, and the tension of the crawler 17 can be adjusted. A nut 47 functioning as a so-called double nut is provided at a position adjacent to the nut 46, and the rotation of the tension bolt 41 is locked by tightening the nut 47.

  As shown in FIG. 4, the mounting brackets 38 and 42 are configured to be connected to the idle wheels 14 and 15 by two upper and lower bolts 48, respectively. Here, the idler wheels 14 and 15 side of this embodiment is provided with a plurality of upper bolt through holes 14a and 15a on an arc centered on a lower bolt through hole (not shown), thereby The height of the idle wheels 14 and 15 can be changed by selective replacement. For example, in wetlands, the idle wheels 14 and 15 are used in a raised state to reduce mud pushing, and in the fields, the traction force is increased, and in sloping areas, the idle wheels 14 and 15 are used in a lowered state. be able to.

  Further, in the present embodiment, as shown in FIG. 4, the height C from the contact surface to the center of the front idler wheel 14 and the height D from the contact surface to the center of the rear idler wheel 15 are the same. . In this way, it becomes easy to share the related parts of the front idler wheel 14 and the related parts of the rear idler wheel 15. For example, in this embodiment, the mounting brackets 38 and 42 are shared.

  As shown in FIG. 15, the rear axle case 6 of the present embodiment is provided with a diff lock operation shifter 49 that rotates according to an operation of a diff lock operating tool such as a diff lock pedal and operates a differential lock sleeve 48. . One end of the diff lock operation shifter 49 protrudes from the rear axle case 6 and is fixed to the operation plate 50 connected to the diff lock operation tool by a nut 51. A groove 49a is formed in an intermediate portion of the diff lock operation shifter 49 located inside the rear axle case 6, and a bolt 52 screwed from the outside of the rear axle case 6 is engaged with the groove 49a, whereby the diff lock operation shifter 49 is engaged. Is positioned. In this case, the positioning workability can be improved as compared with the case where the differential lock actuating shifter 49 is positioned by a member incorporated inside the rear axle case 6.

  According to the present embodiment configured as described, the left and right rear axles 5 rotatably supported on the rear axle case 6, the drive wheels 10 attached to the left and right rear axles 5, and the rear axle of the rear axle case 6. A swing support shaft 11 supported at a lower position, a track frame 13 supported by the swing support shaft 11 via a holder 12 so as to be swingable up and down, and front and rear idlers 14 provided on the track frame 13; In the semi-crawler tractor 1, the rear axle case includes a drive wheel 10, idle wheels 14, 15, and a crawler 17 wound around the roller wheels 16. 6 and the holder 12 are provided with contact portions 6b, 6c, 12a, and 12b that are in contact with each other so that the contact portions 6b, 6c, 12a, and 12b are in contact with each other. Thus, since the vertical swing range of the track frame 13 is limited, the number of parts can be reduced and the cost can be reduced compared to the conventional structure in which the rear axle case 6 and the track frame 13 are provided with swing limit members. You can go down. Further, since the shapes of the rear axle case 6 and the track frame 13 can be simplified, not only the adhering mud easily drops, but also maintainability such as cleaning and maintenance can be improved.

  Further, a greasing plug 24 is attached to the outer peripheral surface of the holder 12 toward the rear side, and the greasing is performed between the rocking support shaft 11 and the holder 12 via the greasing plug 24, so that the rocking support Grease between the shaft 11 and the holder 12 can be easily performed from the rear side of the machine body.

DESCRIPTION OF SYMBOLS 1 Semi-crawler tractor 5 Rear axle 6 Rear axle case 6b Contact part 6c Contact part 7 Crawler device 10 Drive wheel 11 Swing support shaft 12 Holder 12a Contact part 12b Contact part 13 Track frame 14 Front idler wheel 15 Rear idler Wheel 16 Roller 17 Crawler 24 Grease plug

Claims (2)

Left and right rear axles rotatably supported on the rear axle case;
Drive wheels attached to the left and right rear axles;
A swing support shaft supported at a position below the rear axle of the rear axle case;
A track frame that is supported by the swing support shaft so as to be swingable up and down via a holder;
Front and rear idler wheels provided on the track frame;
A wheel provided between the front and rear idler wheels;
In a semi-crawler tractor comprising the drive wheel, the idler wheel, and a crawler wound around the wheel,
The opposing portions of the rear axle case and the holder are integrally provided with contact portions that contact each other on both sides of the swing support shaft, and the vertical swing range of the track frame is determined by contact between the contact portions. In configuring to limit
A semi-crawler tractor characterized in that the contact surfaces of the left and right contact portions on the rear axle case side are in a straight line . 2. The semi-crawler tractor according to claim 1 , wherein the rear accelerator case is provided with a surface corresponding to the left and right contact surfaces as a symmetrical shape with respect to a symmetry line passing through the rear axle .

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