JP2010058659A - Crawler type traveling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly suppress vibration of a crawler belt and to attain simplification of a structure of a vibration suppression mechanism in a crawler type traveling device for supporting idlers at front and rear sides of a truck frame pivotally supported on a support fixed to a traveling machine body through a pivot support shaft, provided with a drive wheel mounted to the support side above a middle part between the front and rear idlers and at an upper side of the pivot support shaft and provided with a vibration suppression mechanism for suppressing vibration of a crawler belt wound over the drive wheel and the front and rear idlers. <P>SOLUTION: The crawler type traveling device is constituted by a first link 46 for supporting the vibration suppression mechanism 41 in the rear-up inclined form and having a lower end pivotally supported on a front part of the truck frame 12; a guide wheel 42 mounted to the first link 46 and abutted on the crawler belt 11 between the drive wheel 8 and the idler 9F at the front side; and a second link 49 having a front end pivotally supported on an upper end side of the first link 46 and a rear end pivotally supported on a support 14, adjustable in length and used at constant length after adjustment of the length. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a crawler type traveling device.

Conventionally, for example, there is a semi-crawler tractor in which a crawler type traveling device (semi-crawler) is attached instead of the rear wheel of a four-wheel drive or rear wheel drive tractor.
As the crawler type traveling device, a track frame that is swingably supported around the axis of the swing support shaft via a swing support shaft having a horizontal axis on a support fixed to the traveling machine body. And an idler is supported on the front and rear of the track frame, and a drive wheel attached to the support body is provided above the midway between the front and rear idlers and above the swing support shaft, and the drive wheel is driven to rotate. Thus, the crawler belt wound around the driving wheel and the front and rear idlers is configured to circulate in the circumferential direction, and the front idler is urged toward the crawler belt on the track frame to thereby apply the crawler belt to the crawler belt. Some have tension adjusting devices that apply tension.

In this crawler type traveling device, a tension adjusting device for tensioning the crawler belt is provided. However, when the crawler type traveling device is advanced at a high speed, the crawler belt is driven on the loose side. There is a problem that the belt tends to vibrate in the belt thickness direction between the wheel and the front idler.
Accordingly, there is a crawler type traveling device provided with a vibration suppressing mechanism in order to suppress vibration of the crawler belt during the high speed traveling (see Patent Document 1).
This vibration suppression mechanism has a rear-upward inclined shape and a lower end of the support arm pivotally supported on the front side of the track frame, and is attached to the support arm between the drive wheel and the front idler. A guide wheel that contacts the inner peripheral side of the crawler belt and an urging unit that urges the guide wheel toward the crawler belt are provided.

The biasing means includes a cylindrical body whose rear end is pivotally supported by a support body, a shaft body whose rear side is inserted into the front part side of the cylindrical body so as to be movable forward and backward, and a front side of the shaft body. A pivot member connected to the upper end side of the support arm, a spring receiver provided on the cylindrical body, a spring receiver provided on the shaft body, and a coil spring interposed between these spring receivers in a compressed manner, It has.
The front side of the shaft body is attached to the connecting member pivotally supported on the upper end side of the support arm so as to be movable forward and backward in the axial direction. The urging force that presses the guide wheel against the crawler belt can be changed by expanding and contracting in the axial direction between the spring receivers.
Japanese Patent No. 3863112

In the vibration suppression mechanism, since the guide wheel is pressed against the crawler belt by the urging force of the urging means, the crawler belt strongly presses the guide wheel when the crawler belt vibrates during high-speed traveling. When a strong force is applied, the guide wheels may be excited against the urging force of the urging means, and there is room for improvement in suppressing crawler belt vibration during high-speed traveling.
Another problem is that the biasing means for biasing the guide wheel has a complicated structure and is expensive.

  Therefore, in view of the above problems, an object of the present invention is to provide a crawler type traveling device including a vibration suppressing mechanism that can surely suppress vibration of a crawler belt and that has a simplified structure.

  The technical means taken by the present invention in order to solve the technical problem is that the axis of the swing support shaft is provided via a swing support shaft having a left and right axial center on a support fixed to the traveling machine body. A track frame that is swingably supported around the track frame, supports an idler on the front and rear sides of the track frame, and is attached to the support body above a midway between the front and rear idlers and above the swing support shaft. A drive wheel is provided, and the crawler belt wound around the drive wheel and the front and rear idlers is circulated in a circumferential direction by rotating the drive wheel, with the front idler facing the track frame toward the crawler belt. A tension adjusting device for tensioning the crawler belt by urging the crawler belt, and a vibration suppressing mechanism for suppressing the vibration of the crawler belt. A first link whose lower end side is inclined upward and pivotally supported on the front side of the track frame, and a crawler belt attached to the first link between the drive wheel and the front idler. A guide wheel that contacts the inner peripheral side, and a second link whose front end side is pivotally supported on the upper end side of the first link and whose rear end side is pivotally supported on the support side, and the second link has a length. The guide ring is configured to be adjustable, and the guide ring is pressed against the crawler belt by extending the second link, and is used with a fixed length after the length adjustment.

Further, the length of the second link is set so that the guide wheel is pressed against the crawler belt at the time of horizontal road surface contact.
The second link is screwed into a front screw rod whose front end is pivotally supported on the upper end side of the first link, a rear screw rod whose rear end is pivotally supported on the support side, and the front and rear screw rods. And one of the screw part of the front screw thread or the screw thread of the rear screw thread is a right screw and the other is a left thread, and the connection member is arranged around the axis of the screw thread. The length is adjustable by turning.

  According to the present invention, the vibration suppressing mechanism that suppresses the vibration of the crawler belt is inclined rearward and has a first link whose lower end is pivotally supported on the front side of the track frame, and the first link. A guide wheel that is attached and is in contact with the inner peripheral side of the crawler belt between the drive wheel and the front idler, the front end side is pivotally supported on the upper end side of the first link, and the rear end side pivots on the support side. The second link is configured to be adjustable in length, and the guide ring is pressed against the crawler belt by extending the second link, and the length of the second link is fixed after the length adjustment. Since the guide wheel is supported by the second link that is used at a fixed length after the length adjustment, vibration of the crawler belt can be reliably suppressed, and the vibration suppression mechanism Structural It is possible to achieve the iodinated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 4, 1 is a semi-crawler tractor (vehicle) equipped with a semi-crawler type crawler traveling device 2 instead of the rear wheel of a four-wheel drive or rear wheel drive tractor.
The tractor 1 is exemplified by a tractor with a cabin in which a cabin 4 is mounted on the rear part of a vehicle body 3 (running vehicle body), and a driver's seat 5 is provided in the rear part of the cabin 4. Is provided with a traveling handle 6.
The vehicle body 3 is configured by attaching a power transmission case to the rear part of the engine via a flywheel housing, and the power transmission case includes a clutch housing and a transmission case.

The front wheel 7 is a steered wheel and is provided on both the left and right sides of the front axle case. The front axle case is mounted around a front axle frame that is fixedly attached to the engine so as to protrude forward from the engine. It is swingably supported.
As shown in FIG. 1, the crawler type traveling device 2 includes one sprocket 8 (drive wheel), a pair of front and rear idlers 9F and 9R, a plurality of (four wheels in this embodiment) rolling wheels 10, and these sprockets. 8, endless belt-like crawler belt 11 wound around front and rear idlers 9F and 9R and wheel 10, track frame 12 to which front and rear idlers 9F and 9R and wheel 10 are attached, and axle 36 (rear axle) of tractor 1 A transmission case 13 having a power transmission mechanism for transmitting power to the sprocket 8 and a support body 14 for supporting the track frame 12 are provided, and the sprocket 8 is driven to rotate around a left and right axis. A driving force is transmitted from the sprocket 8 to the crawler belt 11, and the crawler belt 11 is circulated in the circumferential direction. It is configured to row.

As shown in FIGS. 1 and 2, the track frame 12 is formed to be long in the front-rear direction, and a front idler 9F is provided on the front side of the track frame 12 so as to be rotatable about the left-right axis. A rear idler 9R is rotatably provided on the rear side.
A tension adjusting device 16 that adjusts the tension of the crawler belt 11 is provided on the upper portion of the front side of the track frame 12.
The tension adjusting device 16 includes a cylindrical guide member 17 that is fixed to the track frame 12 in a downwardly inclined manner, a cylindrical guided member 18 that is inserted into the guide member 17 so as to be retractable from the front side, A grease cylinder 19 housed in the guided member 18 and a compression coil spring 20 (biasing member) that biases the guided member 18 diagonally forward and downward via the grease cylinder 19 are provided.

A bracket 21 is provided on the front end side of the guided member 18, and a front idler 9 </ b> F is supported by the bracket 21 so as to be rotatable around a horizontal axis, and the front idler 9 </ b> F is attached to the coil spring 20. The crawler belt 11 is pressed against the inner peripheral surface of the crawler belt 11 by a force, and tension is applied to the crawler belt 11, and the tension of the crawler belt 11 is adjusted by injecting grease into the cylinder body of the grease cylinder 19. can do.
Further, the rear idler 9R is supported by a bracket 22 fixed to the rear end side of the track frame 12 so as to be rotatable about a left and right axis.

The plurality of wheels 10 are disposed below the track frame 12 and in the front-rear direction between the front and rear idlers 9F, 9R, and swing around the axis in the left-right direction via the pivot 23 on the lower surface side of the track frame 12. A pair of front and rear swing frames 24 that are freely supported are provided, and the wheels 10 are supported on the front and rear sides of the pivot shaft 23 of each swing frame 24 so as to be rotatable about the axis in the left-right direction. Yes.
The sprocket 8 is disposed above the track frame 12 and above the middle part between the front and rear idlers 9F and 9R and is supported by a transmission case 13, which is the rear axle of the rear part of the vehicle body 3 of the tractor 1. The case 25 is fixedly attached to the outer end side in the left-right direction.

In this crawler type traveling device 2, the distance in the front-rear direction from the rotation axis of the sprocket 8 to the rotation axis of the front idler 9F is the rotation axis of the rear idler 9R from the rotation axis of the sprocket 8. The length of the portion between the sprocket 8 of the crawler belt 11 and the front idler 9F in the horizontal road surface ground state is set to be longer than the distance in the front-rear direction. And the length of the portion between the rear idler 9R.
The support body 14 is attached and fixed to the lower surface of the transmission case 13 and the lower surface of the rear axle case 25, and the outer end side in the left-right direction is located substantially directly below the sprocket 8.

The supports 14 of the left and right crawler type traveling devices 2 are connected to each other by a connecting frame 26, and the connecting frame 26 is attached to the lower surface of the rear portion of the vehicle body 3 of the tractor 1.
A swing support shaft 27 having a left and right axial core is provided on the lower side of the support body 14 on the outer end side in the left and right direction, and the track frame 12 is supported by the support body 14 via the swing support shaft 27. Are supported so as to be vertically swingable (suspended) around the axis of the swing support shaft 27.
The support 14 includes a main frame 28 mainly composed of a thick plate material, and a support cylinder 29 that supports the swing support shaft 27 by being fitted therein.

The main frame 28 includes an upper wall 28a attached and fixed to the lower surface of the transmission case 13 and the lower surface of the rear axle case 25 by bolts, etc., and a front wall extending obliquely downward from the front edge of the upper wall 28a. 28b and a rear wall 28c extending downward from the rear edge of the upper wall 28a.
A pair of left and right support cylinders 29 are provided. The support cylinders 29 have left and right axial centers and are arranged opposite to each other in the left and right direction. Each of the support cylinders 29 is fixed to a support plate 30 fixed to the lower surface side of the main frame 28. ing.
On the other hand, the track frame 12 is provided with a supported cylinder 31 arranged concentrically between the left and right support cylinders 29, and the swinging support shaft 27 extends outward in the left-right direction across the support cylinder 29 and the supported cylinder 31. The swing support shaft 27 is fixed to a support plate and is prevented from coming off, so that the track frame 12 is swingably supported by the support body 14.

The crawler belt 11 is formed in an endless belt shape with rubber, and the rubber driving projections 32 are appropriately spaced in the circumferential direction on the inner peripheral side in the left-right direction central side and extend in the circumferential direction. Is provided.
The driving protrusion 32 engages with the sprocket 8 in the circumferential direction and receives torque (driving force) from the sprocket 8, and engages with the wheel 10, the sprocket 8, and the idlers 9F and 9R in the left-right direction to remove the wheel. (Preventing the crawler belt 11 from coming off).
A lug is provided on the outer peripheral side of the crawler belt 11.

A transmission shaft 33 having a left and right axial core is disposed in the lower portion of the transmission case 13, and a drive shaft 34 is disposed in parallel with the transmission shaft 33 in the upper portion of the transmission case 13. An intermediate shaft 35 is arranged in parallel with the drive shaft 34.
The transmission shaft 33 protrudes inward in the left-right direction from the transmission case 13 and is coupled to the axle 36 in the rear axle case 25 via a coupling.
On the other hand, power from the engine passes through a clutch through a speed change mechanism in the power transmission case, and is then transmitted to the rear wheel differential device, from which power is branched to the axle 36 in the left and right rear axle case 25, Power is transmitted from each axle 36 to the transmission shaft 33 of the left and right crawler type traveling devices 2.

The drive shaft 34 protrudes outward in the left-right direction from the transmission case 13, and a flange portion 37 is provided at the protruding end portion, and the sprocket 8 is attached and fixed to the flange portion 37.
The transmission shaft 33 is provided with a first gear 38, the drive shaft 34 is provided with a second gear 39, and the intermediate shaft 35 is provided with an idler gear 40 that meshes with the first and second gears 38, 39. Power transmission is performed from the transmission shaft 33 to the drive shaft 34 by the gear transmission mechanism (power transmission mechanism) including the first gear 38, the second gear 39, and the idler gear 40, so that the sprocket 8 is the axis of the drive shaft 34. It is driven to rotate around.

The drive shaft 34 is positioned above the transmission shaft 33 in the vertical direction, and the swing support shaft 27 is positioned slightly above the transmission shaft 33 from below in the vertical direction.
A vibration suppression mechanism 41 that suppresses vibration of the crawler belt 11 (suppresses fluttering of the crawler belt 11 by guiding the crawler belt 11) is provided on the front side of the crawler traveling device 2.
As shown in FIGS. 1 and 3, the vibration suppression mechanism 41 includes a guide wheel 42 that contacts the inner peripheral side of the crawler belt 11 and a link mechanism 43 that supports the guide wheel 42.

The link mechanism 43 is pivotally supported by a bracket 44 provided at the front upper portion of the guide member 17 of the tension adjusting device 16 so that one end side (lower end side) can swing around a horizontal axis through a pivot 45. The first link 46, which is inclined upward and rearward, and the bracket 47 fixed to the front wall 28b of the main frame 28 of the support 14 have one end (rear end) on the left and right axis via the pivot 48. And a second link 49 pivotably supported around the center.
The other end sides of the first link 46 and the second link 49 (the upper end side of the first link 46 and the front end side of the second link 49) are rotatable around the axis in the left-right direction via the pivot 50. It is pivotally connected.

The guide wheel 42 is pivotally supported at a midway portion in the length direction of the first link 46 so as to be rotatable about an axis in the left-right direction.
Further, a pair of left and right guide wheels 42 are provided, which are in contact with the left and right sides of the drive protrusion 32 on the inner peripheral surface of the crawler belt 11 at a portion between the sprocket 8 of the crawler belt 11 and the front idler 9F. Yes.
The guide wheel 42 includes a node connecting the one end side pivot portion of the first link 46 and the swinging support shaft 27, a node connecting the one end side pivot portion and the other end side pivot portion of the first link 46, and a second The link 49 is supported by a four-joint link mechanism 43 including a node connecting the one end side pivot support portion and the other end side pivot support portion of the link 49 and a node connecting the one end side pivot support portion of the second link 49 and the swing support shaft 27. Yes.

The second link 49 includes a front screw rod 51 whose front end is pivotally supported on the upper end side of the first link 46, a rear screw rod 52 pivotally supported on the support 14 side, and front and rear thereof. And a connecting member 53 for connecting the screw rods 51 and 52.
A joint member 54 is provided on the front end side of the front screw rod 51, the joint member 54 is pivotally connected to the upper end side of the first link 46 via the pivot 50, and the rear screw rod 52 is rear-mounted. A boss 55 having a horizontal axis is provided on the end side, and this boss 55 is pivotally connected to a bracket 47 on the main frame 28 side via a pivot 48.

  The front portion of the connecting member 53 is screwed into a screw portion 51a provided on the front screw rod 51, and the rear portion of the connecting member 53 is screwed into a screw portion 52a provided on the rear screw rod 52. The screw portions 51a and 52a provided on the screw rods 51 and 52 are right screws, and the screw portions 51a and 52a provided on the other screw rods 51 and 52 are left screws (reverse screws). By rotating 53 around the axis of the screw rods 51 and 52, the screw rods 51 and 52 move in the direction of approaching and separating from each other, whereby the length of the second link 49 is changed. Yes (length is adjustable).

Therefore, the length of the second link 49 can be adjusted manually, and by extending the second link 49, the first link 46 swings forward and the guide wheel 42 is pressed against the crawler belt 11.
Further, the second link 49 does not naturally change in length after the length adjustment, and is used with a constant length.
In the crawler type traveling device 2 configured as described above, during traveling, the track frame 12 swings up and down around the axis of the swing support shaft 27 following the unevenness of the traveling road surface. When the front side largely swings forward, the crawler belt 11 is separated from the guide wheel 42 as shown in FIG.

However, when traveling at high speed, the vehicle travels on a substantially horizontal road surface, and the track frame 12 only slightly swings up and down. When the front side of the track frame 12 swings greatly upward, There is no problem because it is a case of not driving.
The guide wheel 42 is pressed against the crawler belt 11 when the horizontal road surface is in contact, and when the track frame 12 swings forwardly upward, the angle formed by the first link 46 and the second link 49 becomes small, and the guide wheel 42. Therefore, when the track frame 12 swings slightly upward, the guide wheel 42 is in contact with the crawler belt 11 and there is no problem in high-speed traveling on a substantially horizontal road surface. .

Conversely, when traveling on a substantially horizontal road surface, the length of the second link 49 is set so that the guide wheel 42 contacts the track frame 12 even if the track frame 12 swings slightly upward. The
Further, when the track frame 12 swings downward, the crawler belt 11 is pressed against the guide wheel 42. In this case, as shown in FIG. 6, the depression angle formed by the first link 46 and the second link 49 is formed. Becomes larger and the guide wheel 42 is displaced in the direction of escaping.

It is a side view in the horizontal road surface ground state of a crawler type traveling device. It is a rear view of a crawler type traveling device. It is a side view of a vibration suppression mechanism. It is a side view of a tractor. It is a side view which shows the state which the front part of the track frame rock | fluctuated upwards to the limit. It is a side view which shows the state which the front part of the track frame rock | fluctuated below to the limit.

Explanation of symbols

3 Driving body (car body)
8 Drive wheel (sprocket)
9F Front idler 9R Rear idler 11 Crawler belt 12 Track frame 14 Support body 16 Tension adjusting device 27 Oscillating support shaft 41 Vibration suppression mechanism 42 Guide wheel 46 First link 49 Second link 51 Front screw rod 52 Rear side Threaded portion 53 Connecting member 51a Threaded portion of the front side 杆 51b Threaded portion of the rear side 杆

Claims (3)

  A support (14) fixed to the traveling machine body (3) is supported by a support (14) so as to be swingable about the axis of the swing support shaft (27) via a swing support shaft (27) having a horizontal axis. The track frame (12) is provided, and idlers (9F, 9R) are supported on the front and rear sides of the track frame (12), above the midway between the front and rear idlers (9F, 9R) and on the swing support shaft (27 ) Is provided with a drive wheel (8) attached to the support (14) side, and the drive wheel (8) is rotated to drive the drive wheel (8) and the front and rear idlers (9F, 9R). A crawler belt (11) wound over the crawler belt (11) is configured to circulate and circulate in a circumferential direction. Belt (11) A tension adjusting device (16) for applying tension is provided, and a vibration suppression mechanism (41) for suppressing the vibration of the crawler belt (11) is provided. A first link (46) whose lower end side is pivotally supported on the front side of the track frame (12), and is attached to the first link (46) and includes a drive wheel (8) and a front idler (9F). A guide ring (42) contacting the inner peripheral side of the crawler belt (11) between the front end side is pivotally supported on the upper end side of the first link (46) and the rear end side is on the support body (14) side. A second link (49) that is pivotally supported. The second link (49) is configured to be adjustable in length, and the guide ring (42) is extended by extending the second link (49). Pressed against the crawler belt (11) and Is adjusted crawler type traveling apparatus characterized by being used with a constant length.   The crawler type traveling device according to claim 1, wherein the guide wheel (42) is pressed against the crawler belt (11) when the horizontal road surface is grounded.   The second link (49) has a front screw thread (51) pivotally supported on the upper end side of the first link (46) on the front end side and a rear thread pivot supported on the support body (14) side on the rear end side. A screw rod (52) and a connecting member (53) screwed to the front and rear screw rods (51, 52) are provided, and the screw portion (51a) of the front screw rod (51) or the rear screw rod. One of the screw portions (52a) of (52) is a right-hand thread and the other is a left-hand thread, and the length is adjusted by rotating the connecting member (53) around the axis of the screw rod (51, 52). The crawler type traveling device according to claim 1, wherein the crawler type traveling device is free.

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