JP2005075155A - Crawler cart - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make mounting of an engine E hard to be obstructed by crawlers 1, a drive sprocket 4 or the like by arranging an engine shaft 3 behind a sprocket shaft 5 of the crawlers 1, to lower the engine E to a part as low as possible, and to keep traveling stability of a vehicle by lowering the position of the center of gravity. <P>SOLUTION: A crawler cart is constituted so that the engine E is mounted on a rear end part of a carriage 2 having a pair of right and left crawlers 1 while the engine E shaft 3 is positioned behind the sprocket shaft 5 of the drive sprocket 4 of the crawlers 1, and a transmission case 6 is provided along a longitudinal direction between the right and left crawlers 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a crawler traveling vehicle that lowers the height of an engine mounted on the rear of a vehicle body.

The engine of the crawler transport vehicle is mounted with the engine shaft positioned in front of and above the crawler drive sprocket shaft, and the transmission case of the sprocket shaft transmitted from the engine shaft tilts from the front upper side to the rear lower side. Thus, the vehicle body and the engine and loading platform mounted on the vehicle body are shifted to the front side position relative to the crawler (see, for example, Patent Document 1).
JP 2002-160544 A (first page, FIG. 1).

  In the prior art as described above, the mounting position of the engine is closer to the front than the crawler, so the loading platform on the chassis is also shifted to the front side, the weight balance is closer to the front side, and the mounting load is limited, Also, the height of the center of gravity increases as the mounting height of the engine increases.

  The crawler transporter sets the protruding lengths of the front and rear ends of the chassis or the loading platform within the limit of the crawler separation angle while shortening the crawler length as much as possible. For this reason, the position of the engine mounted on the rear part, the front-rear length of the loading platform, and the like are easily limited. Here, the separation angle is determined by the amount of protrusion of the front and rear ends of the crawler, the loading platform and the like from the front and rear ends of the crawler due to the steep slope of the transport vehicle, the field ground, and the overpass of the fence. In order to increase the separation angle before and after these crawlers, the rear engine mounting position is set as high as possible and high as much as possible, and the protrusion at the front end of the loading platform is shortened. It becomes higher and the front and rear length of the loading platform becomes shorter.

  According to the first aspect of the present invention, the shaft 3 of the engine E is positioned rearward of the sprocket shaft 5 of the drive sprocket 4 of the crawler 1 at the rear end portion of the chassis 2 having the pair of left and right crawlers 1. E is mounted, and the configuration of the crawler transport vehicle is characterized in that a mission case 6 is provided between the left and right crawlers 1 along the front-rear direction. The engine E mounted on the rear end of the chassis 2 passes through a transmission mechanism in the transmission case 6 provided between the left and right crawlers 1, and the sprocket shaft 5 is driven from the rear end of the transmission case 6. 1 is transmitted and travels. Although such an engine E is mounted at the rear end portion of the chassis 2, the engine shaft 3 is set to the rear of the lower sprocket shaft 5 and can be installed as low as possible. In addition, on the chassis 2 located on the upper side of the crawler 1, a cargo bed portion can be formed in a wide area extending in the front and rear directions, and a cargo bed support area in the upper area of the crawler 1 can be widened.

  The invention described in claim 2 is characterized in that a hydraulic continuously variable transmission 7 is provided at the front end of the transmission case 6. The transmission of the left and right crawlers 1 is interlocked with the hydraulic continuously variable transmission 7 by driving the engine E, and then the left and right sprocket shafts 5 and the drive sprocket 4 are interlocked with each other via a transmission mechanism in the transmission case 6. 1 is driven. The hydraulic continuously variable transmission 7 can perform transmission transmission from the neutral position transmission stop position to the forward or reverse range, and can perform a main variable speed increase / decrease from the neutral position to the high speed position in each forward or reverse range. it can. As a transmission mechanism in the transmission case 6, for example, a side clutch or a brake mechanism is provided for steering.

  The invention described in claim 3 is characterized in that a belt 10 having a tension clutch 9 is transmitted between the input shaft 8 and the engine shaft 3 of the hydraulic continuously variable transmission 7. Transmission from the engine E to the left and right crawlers 1 is performed by being transmitted from the engine shaft 3 to the input shaft 8 of the hydraulic continuously variable transmission 7 via the belt 10. The belt 10 is provided with a tension clutch 9, and the hydraulic continuously variable transmission 7 is transmitted by the engagement and disengagement of the tension clutch 9. Since the engine shaft 3 is disposed rearward and higher than the sprocket shaft 5 of the crawler 1, and the input shaft 8 of the hydraulic continuously variable transmission 7 is disposed at the front end portion of the transmission case 6 between the left and right crawlers 1, Even if the arrangement position is low, it is long apart in the front-rear direction. Therefore, the transmission interval by the belt 10 can be increased, and the impact force and the like due to a sudden change in the transmission driving force by the belt 10 and the tension clutch 9 can be reduced. . Smooth transmission is performed by the transmission by the belt 10 and the continuously variable transmission by the hydraulic continuously variable transmission 7.

  The invention according to claim 4 is characterized in that the transmission case 6 is formed such that the vertical height is substantially the same as the diameter of the drive sprocket 4. Since the height of the transmission case 6 in the vertical direction is substantially the same as or smaller than the rotational diameter of the drive sprocket 4, the crawler 1 can rotate even if it is provided in the space between the left and right crawlers 1. The protrusion to the upper side surface can be reduced, the protrusion to the lower grounding surface side is also reduced, and the upper surface of the chassis 2 is lowered in the configuration in which the crawler 1 interval portion extends in the front-rear direction. Keep the height high. For this reason, the height of the engine E, the loading platform or the like can be lowered, and the position of the center of gravity can be lowered. Although the transmission case 6 is sunk in the space between the left and right crawlers 1, it can be brought close to the rotation area of these crawlers 1 and the distance between the left and right crawlers 1 may be greatly expanded. .

  In the first aspect of the present invention, the engine shaft 3 is disposed behind the sprocket shaft 5 of the crawler 1, and therefore, when the engine E is mounted, the engine shaft 3 is not easily disturbed by the crawler 1, the drive sprocket 4 and the like. The mounting form can be lowered, and the position of the center of gravity can be lowered to maintain the stability of the vehicle running. In particular, the larger the engine E, the more effective. Further, since the engine E is arranged at the rear position with respect to the crawler 1, the length of the loading platform installed on the chassis 2 in the upper area of the crawler 1 becomes wider on the rear side, and the center of gravity shifts to the rear side. Thus, it is possible to achieve a front / rear weight balance when carrying and carrying the body.

  According to the second aspect of the present invention, the mounting position of the engine E is provided as a form in which the hydraulic continuously variable transmission 7 is provided on the front side and the transmission case 6 is disposed on the rear side by effectively utilizing the space between the left and right crawlers 1 Is shifted to the rear of the crawler 1, the mounting height is lowered, the chassis 2 area corresponding to the upper side of the crawler 1 formed on the front side of the engine E is lengthened, and the loading platform area mounted on this part Can be widened to the rear side. For this reason, the front and rear weight balance of the vehicle body can be achieved while miniaturizing and simplifying the transmission mechanism, maintaining the loading height of the loading platform and the engine E low, and reducing the center of gravity of the vehicle body for a stable running posture. Can keep.

  Since the engine shaft 3 is mounted at a position behind the sprocket shaft 5 of the crawler 1, the input shaft of the hydraulic continuously variable transmission 7 at the front end portion of the transmission case 6 between the left and right crawlers 1 is provided. 8 and the rear engine shaft 3 can be set low, but the transmission interval of the belt 10 in the front-rear direction is increased to facilitate the belt 10 between them, and the belt 10 The impact force mitigating effect due to this transmission can be maintained satisfactorily, and smooth traveling transmission can be performed by the transmission transmission by the hydraulic continuously variable transmission 7.

  According to a fourth aspect of the present invention, the height of the transmission case 6 provided in the space between the pair of left and right crawlers 1 is substantially the same as or larger than the diameter of the drive sprocket 4 rotated by the rear sprocket shaft 5. Since the height of the upper and lower surfaces of the transmission case 6 formed along the front-rear direction on the front side of the sprocket shaft 5 is restricted, the upper side portion of the crawler 1 that is wound around the drive sprocket 4 is regulated. The protrusion to the upper part of the chassis 2 can be eliminated or reduced, and the height of the chassis 2 and the loading platform can be kept low. Further, in the rotating grounding portion of the crawler 1, the ground surface of the bottom surface of the mission case 6 can be maintained as high as possible. Further, the hydraulic continuously variable transmission 7 on the front side of the transmission case 6 can be formed in the same manner, but this makes it possible to achieve a more effective configuration.

  An embodiment of the present invention will be described with reference to the drawings. The chassis 2 wraps a pair of crawlers 1 on both the left and right sides of the lower part between a drive sprocket 4 at the rear end, an end roller 11 at the front end, a bottom wheel 12 arranged along the grounding surface, etc. Driving can be performed by the rotation of the driving sprocket 4. On the upper side of the chassis 2, an engine E is mounted at the rear, and a handle 13 that is formed in a left and right loop shape above the rear of the engine E, and a side projecting rearward from the loading platform 15 on the side of the engine E A handle 14 is provided, and a loading platform 15 on which loads are loaded is mounted on the front side of these engines E. This chassis 2 is provided with the upper part of the space between the left and right crawlers 1 along the front-rear direction, and is supported by a crawler frame 16 that rotatably mounts each end roller 11, bottom roller 12, etc. Composed. A front portion of the loading platform 15 is supported so as to be rotatable up and down with respect to the crawler frame 16 and can be dumped up and down by a side handle 14.

  A front hydraulic continuously variable transmission (HST) 7 and a rear transmission case 6 are integrally arranged in a rear space between the left and right crawlers 1 and project from the rear end of the transmission case 6 to the left and right sides. The sprocket shaft 5 is provided with a drive sprocket 4 that can rotate by meshing each crawler 1. An engine E is mounted on the rear end upper part of the chassis 2 with the engine shaft 3 directed laterally. The engine shaft 3 is installed at an appropriate distance A behind the sprocket shaft 5 at the lower front side. The belt 10 is stretched between the engine pulley 17 fixed to one end of the engine shaft 3 and the input pulley 18 at the side end of the input shaft 8 located at the front end of the hydraulic continuously variable transmission 7. it can.

  The transmission case 6 is formed so that the case width is narrower than the gap B between the left and right crawlers 1, but the vertical height C of the case is substantially the same as or smaller than the diameter of the drive sprocket 4. It is formed to become. The transmission case 6 is operated by an output shaft 19 of a hydraulic continuously variable transmission 7 connected to the front end of the transmission case 6 by a reduction transmission gear mechanism linked to the sprocket shaft 5 and a pair of left and right side clutch arms 20. It is equipped with a side clutch and a brake mechanism. The hydraulic continuously variable transmission 7 drives the hydraulic pump by the rotation of the input shaft 8 and hydraulically drives the hydraulic motor from the neutral position to the normal rotation direction or the reverse rotation direction to rotate the output shaft 19 forward and backward. By operating the swash plate angle of the hydraulic pump according to the rotation angle of the operation arm 21, it is possible to drive forward / backward from the neutral position to the forward / backward position. The height of the outer portion of the hydraulic continuously variable transmission 7 is also set to the same height C as the transmission case 6. The input shaft 8 of the hydraulic continuously variable transmission 7 is located at a distance D in front of the sprocket shaft 5 and directly connects the sprocket shaft 5 and the wheel shaft 23 of the front end roller 11. The crawler 1 is attached so as to be substantially parallel to the front-rear extending direction. A fan 22 is provided on the input shaft 8 to cool the hydraulic continuously variable transmission 7. The hydraulic continuously variable transmission 7 fixes the outer peripheral part to a part of the chassis 2 and maintains the integrity with the chassis 2. Reference numeral 24 denotes a tension spring of the end roller 23.

  The engine E is placed on the rear end portion of the chassis 2 with a damper interposed therebetween, and is installed close to a part so as not to contact the rear end rotation outer peripheral portion of the crawler 1. Thus, the mounting position of the engine E can be lowered and set to the rear position while maintaining the separation angle α (the angle at which the crawler 1 can be inclined rearward) as large as possible. The belt 10 spanned between the engine pulley 17 of the engine shaft 3 and the input shaft 8 pulley 18 of the hydraulic continuously variable transmission 7 at the lower front portion has an intermediate pulley 26 at an intermediate portion. Between the engine pulley 17 and the engine pulley 17, a tension pulley as the tension clutch 9 is provided on a tension arm 27 that can be turned up and down. The rear end bottom portion of the loading platform 15 on the chassis 2 is covered so as to approach the upper portion of the mission case 6, but the belt 10 is configured to rotate closer to the rear end bottom portion of the loading platform 15. Since the belt 10 is stretched over a relatively long front-rear distance (A + D) between the front and rear input pulleys 18 and the engine pulley 17, the middle part is likely to hang down. At this time, the intermediate pulley 26 is supported and guided to maintain smooth transmission. In particular, when the tension clutch 9 is engaged, the front and rear of the belt 10 pressed by the tension clutch 9 are supported and guided by the intermediate pulley 26 and the engine pulley 17 to accurately maintain the engagement of the clutch transmission.

  The hydraulic continuously variable transmission 7 and the transmission case 6 are provided along the front-rear direction of the crawler 1, but their height is substantially the same as the diameter of the drive sprocket 4. Is not projected upward from the outer peripheral surface of the crawler 1 rotating, and the bottom portion of the loading platform 15 can be made as close to the rotating upper circumferential surface of the crawler 1 as possible, and the support height of the loading platform 15 can be lowered. Further, the bottom side of the crawler 1 is supported and guided by the bottom wheel 12, but the lower surface position of the hydraulic continuously variable transmission 7 and the transmission case 6 is formed to be approximately the same height as the diameter of the drive sprocket 4. The height interval between the crawler 1 and the bottom surface of the crawler 1 can be maintained large, and the height interval between the upper side portion and the lower side portion of the crawler 1 can be minimized to reduce the height of the loading platform 15. it can.

  The engine E mounted on the rear end portion of the chassis 2 may be provided with a damper so as to be appropriately sunk downward from the upper surface of the chassis 2. In this case, the mounting surface of the engine E is set higher than the line of the separation angle α at the rear end so as not to be positioned below. In the loading platform 15, the protruding position of the front end portion with respect to the crawler 1 is limited by the separation angle β of the front end (an angle that can be inclined to the front side), but the engine E is mounted on the rear position with respect to the chassis 2 and the crawler 1. Thus, the rear end of the loading platform 15 can be extended to the rear side with respect to the crawler 1 and installed.

  The left and right sides of the handle 13 have side clutch levers 28 for operating the side clutch arms 20 of the transmission case 6, and the upper clutch is provided with a left and right loop-type travel clutch lever 29 so that the tension clutch 9 The tension arm 27 is interlocked. The base of the handle 13 has an operation panel 30 and is provided with a throttle lever 31 for adjusting the rotation of the engine E and a transmission lever 32 for operating the operation arm 21 of the hydraulic continuously variable transmission 7.

The side view of a crawler carrier. The top view of the mission case part. The top view of the conveyance vehicle.

Explanation of symbols

1 crawler 2 chassis 3 engine shaft 4 drive sprocket 5 sprocket shaft 6 transmission case 7 hydraulic continuously variable transmission 8 input shaft 9 tension clutch 10 belt

Claims (4)

  At the rear end of the chassis (2) having a pair of left and right crawlers (1), the shaft (3) of the engine (E) is located behind the sprocket shaft (5) of the drive sprocket (4) of the crawler (1). The crawler transporter is characterized in that the engine (E) is mounted and the transmission case (6) is provided between the left and right crawlers (1) along the front-rear direction.   The crawler transporter according to claim 1, wherein a hydraulic continuously variable transmission (7) is provided at a front end portion of the transmission case (6).   The belt (10) having a tension clutch (9) transmits power between the input shaft (8) of the hydraulic continuously variable transmission (7) and the engine shaft (3). Crawler transporter.   The crawler cart according to claim 1, 2 or 3, wherein the transmission case (6) has a vertical height that is substantially the same as the diameter of the drive sprocket (4).

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