JP4330965B2 - Traveling vehicle - Google Patents

Description

  The present invention relates to a traveling vehicle having a crawler traveling device that circulates and rotates a crawler belt in a circumferential direction by rotationally driving drive wheels.

Conventionally, in this type of traveling vehicle, a mounting portion for a driver's seat protection device such as a cabin is provided on the left and right rear axle cases projecting from the rear portion of the traveling vehicle body, and the prop of the driver's seat protection device is supported. A track frame of a crawler traveling device is supported on a rear axle case so as to be able to swing back and forth via a swing shaft, and a crawler belt is circulated and rotated in the circumferential direction by driving a drive wheel provided on the rear axle. Yes (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-245859

In some traveling vehicles having this type of crawler traveling device, a rear axle and a drive shaft of a drive wheel (sprocket) are configured separately, and both shafts can transmit power via gear transmission means. The present applicant has already filed a patent application for this technology (for example, see Japanese Patent Application No. 2002-087365).
That is, in this technique, a transmission case that houses the gear transmission means is provided at the left and right end portions of the rear axle case, and the drive shaft of the drive wheel is disposed above the rear axle.
In this case, the transmission case and the mounting portion for the driver's seat protection device are arranged side by side on the rear axle case.

In the traveling vehicle as described above, for example, when it is intended to be used for narrow space in an orchard or the like, the height (ground height) of the traveling vehicle is reduced, or between the left and right crawler traveling devices of the traveling vehicle. It is necessary to shorten the distance.
In this case, in the above-described technique, the drive shaft of the drive wheel is disposed above the rear axle, so that the crawler traveling device can be disposed above the traveling vehicle body, thereby increasing the height of the traveling vehicle. However, if the distance between the left and right crawler travel devices is to be shortened, the mounting part of the driver's seat protection device provided on the rear axle case becomes an obstacle to the arrangement of the transmission case. Thus, there is a problem that it is difficult to shorten the distance between the left and right crawler traveling devices.

  Therefore, the present invention provides a traveling vehicle in which the distance between the left and right crawler traveling devices can be shortened by overlapping the transmission case provided in the rear axle case and the mounting portion of the driver's seat protection device in the left-right direction. The purpose is to do.

Specific means for solving the problems in the present invention will be described below.
First, the traveling device projects left and right rear axle cases 19 at the rear portion of the traveling vehicle body 3, and an attachment portion 36 is provided on the left and right rear axle cases 19 to support the columns of the driver's seat protection device 4. A transmission case 17 having transmission means 32 for transmitting power from the rear axle 25 to the drive shaft 26 is provided at the end of each of the left and right rear axle cases 19, and the track frame 16 of the crawler traveling device 2 is connected via the swing shaft 22. The driving wheel 11 of the crawler traveling device 2 is provided on the driving shaft 26 at the end of the transmission case 17, the transmission case 17 extends in the front-rear direction from the end of the rear axle case 19, and It is that it overlaps with the attachment part 36 in the left-right direction.

According to this, the crawler traveling device is more than the case where both of the transmission case 17 and the mounting portion 36 of the driver's seat protection device 4 are overlapped in the left-right direction on the rear axle case 19 side by side. The distance between them can be shortened.
Secondly, the mounting portion 36 is formed on the upper surface of the rear axle case 19, the transmission case 17 extends from the end of the rear axle case 19 so as to be inclined rearward and upward, and the rear lower portion of the mounting portion 36 is cut away. Thus, the front upper part of the transmission case 17 is inserted into the notch 41a.
According to this, the distance between the left and right crawler traveling devices 2 can be shortened by the amount that the transmission case 17 enters the rear lower portion of the attachment portion 36 of the driver seat protection device 4, and the drive shaft 26 is connected to the rear axle 25. The crawler traveling device 2 can be disposed above the traveling vehicle body 3 by this amount, so that the height of the traveling vehicle body 3 can be lowered, and the shaft between the front wheels It is possible to increase the distance.

Third, the swing shaft 22 of the track frame 16 is disposed below the rear axle 25 and the drive shaft 26 and at an intermediate position in the front-rear direction thereof.
According to this, the crawler traveling device 2 can be disposed further rearward, and the traveling vehicle body 3 can be stabilized.
Fourthly, the transmission case 17 is divided into left and right parts, and the divided transmission case 17a on the traveling vehicle body 3 side is integrally formed with the rear axle case 19.
According to this, it is not necessary to attach the divided transmission case 17a on the traveling vehicle body 3 side to the rear axle case 19, and maintenance of the transmission case 17 can be facilitated by simply attaching and detaching the divided transmission case 17b on the opposite side to the traveling vehicle body 3. .

Fifth, the attachment portion 21 of the support 24 that supports the swing shaft 22 is formed in the divided transmission case 17b and the rear axle case 19 on the opposite side of the traveling vehicle body 3.
According to this, the divided transmission case 17b on the opposite side to the traveling vehicle body 3 and the divided transmission case 17a on the rear axle case 19 side can be connected by the support 24 of the swing shaft 22, thereby dividing the divided transmission case 17a. , 17b can be strengthened.

  According to the present invention, the left and right crawler travel devices between the left and right crawler traveling devices can be provided even if the driver seat protection device is provided by the left and right overlap arrangement between the transmission case provided on the rear axle case and the driver seat protection device attachment. The distance can be shortened.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 5, 1 is a semi-crawler tractor (vehicle) in which a crawler type traveling device 2 (semi-crawler) is provided independently on the left and right instead of the rear wheel of the four-wheel drive tractor, and the front wheel 7 is a steered wheel. .
This tractor 1 has illustrated that the cabin is mounted in the rear part of the traveling vehicle body 3 as the driver seat protection device 4 that protects the driver seat 5. The driver's seat protection device 4 is not limited to the cabin, and includes a device equipped with various instruments and devices for protecting the driver's seat 5, such as a canopy and a lops device.

The driver's seat protection device 4 includes an upper structure 4a that constitutes a driver's cab and a support column 4b that supports the upper structure 4a. A fender 20 is provided at the left and right lower portions of the upper structure 4a, a driver's seat 5 is provided at the rear of the driver's cab, and a steering handle 6 is disposed in front of the driver's seat 5.
The support columns 4b are provided at two places in the left and right direction in the front lower part of the upper structure 4a and two places in the left and right direction in the rear lower part. A plate-like support seat 4c is provided at the lower portion of the column 4b.
The traveling vehicle body 3 has an engine 8 mounted between the front and rear axles, a transmission case 9 is attached to the rear part of the engine 8 via a flywheel housing, a front axle frame 10 projects forward from the engine 8, and the transmission case 9 The rear axle case 19 (axle case) is provided at the rear part of the left and right side parts of the left and right side parts so as to protrude leftward and rightward. A brake housing part 19 a for accommodating a brake device for braking the rear axle 25 is formed at the inner end (base part) in the left-right direction of the rear axle case 19. The rear axle case 19 is integrated with the transmission case 9 by fixing the brake housing portion 19 a to the side surface of the transmission case 9.

The pair of left and right crawler type traveling devices 2 have a bilaterally symmetric structure, and are assembled to the left and right outer ends of the rear axle case 19 as shown in FIG.
1 to 4, each of the left and right crawler type traveling devices 2 includes one drive wheel 11, a pair of front and rear driven wheels 12 and 13, a plurality (two in the embodiment) of rolling wheels 14, and these drive wheels 11. The crawler belt 15 wound around the driven wheels 12 and 13 and the wheel 14, the track frame 16, and the transmission case 17 (gear case) are provided, and the drive wheel 11 is arranged around the axis in the left-right direction. By being rotationally driven, the crawler belt 15 is circulated in the circumferential direction, and is thus configured to run.

The track frame 16 is mainly composed of a rectangular cylinder and is disposed along the front-rear direction. The front and rear driven wheels 12 and 13 are disposed at the front and rear ends of the track frame 16 and the front and rear are disposed in the middle. Two rolling wheels 14 are detachably mounted from below at intervals.
In FIGS. 1 and 2, the drive wheel 11 is disposed above the track frame 16 and above the middle part between the front and rear driven wheels 12 and 13, and the drive shaft 26 on which the drive wheel 11 is mounted is connected to the transmission case 17. It is supported by. The drive wheel 11 has a plurality of meshing members 40 on its outer periphery for engaging with the crawler belt 15 and circulating.

In FIG. 1, the meshing member 40 is constituted by a pin, and has a cylindrical large-diameter engaging portion 51 at the center in the axial direction, and a small-diameter shaft that protrudes outward in the left-right direction from the left and right sides of the engaging portion 51. The left and right shaft portions 52 are removably inserted into the shaft support holes of the side wheels 39.
The crawler belt 15 is made of an elastic material such as rubber, and the main body portion is formed into an endless belt shape, a circumferential tensile body is embedded therein, and a width direction tensile body (core metal, etc.) may be embedded therein. Drive protrusions 23 are integrally formed with the main body portion at equal intervals in the circumferential direction on the inner peripheral side.

The driving protrusion 23 of the crawler belt 15 is engaged with the driving wheel 11 in the circumferential direction and receives a driving force from the driving wheel 11, and is engaged with the wheel 14, the driving wheel 11, and the driven wheels 12, 13 in the left-right direction. And the function of preventing the wheel from being removed (preventing the crawler belt 15 from coming off).
The driven wheel 12 is supported by a bracket provided on a tension adjusting device 18 that adjusts the tension of the crawler belt 15 so as to be rotatable about a horizontal axis, and the tension adjusting device 18 is fixed to the front portion of the track frame 16. Has been.
The shaft center of the drive wheel 11 is located above the shaft center of the rear axle 25, and the contact angle (contact range) of the crawler belt 15 with respect to the drive wheel 11 is larger than that provided in the rear axle 25. The engagement ratio between the drive wheels 11 and the drive projections 23 of the crawler belt 15 is increased and the number of meshing teeth is increased. That is, the number of meshing members 40 (meshing portions) that are engaged with the drive protrusions 23 of the drive wheels 11 at the portion where the crawler belt 15 is wound around the drive wheels 11 is increased. The crawler traveling device 2 unit can be disposed relatively upward with respect to the traveling vehicle body 3 by disposing the shaft center of the drive wheel 11 above the shaft center of the rear axle 25. The height of the traveling vehicle (the ground height) can be set low.

The transmission case 17 is provided on the left and right outer ends of the rear axle case 19 and has a shape extending in the front-rear direction with respect to the rear axle case 19. The transmission case 17 is extended so that a rear portion thereof is inclined rearward and upward from an end portion of the rear axle case 19. The outer end of the rear axle 25 is inserted into the lower part of the transmission case 17, and the drive shaft 26 of the drive wheel 11 is rotatably supported at the rear upper part of the transmission case 17 so as to be spaced rearward and upward from the rear axle 25. Yes.
An end portion of the drive shaft 26 is disposed at the upper rear portion of the transmission case 17 and protrudes outward. The drive wheel 11 is detachably fixed to a flange portion 28 provided at the protruding end portion.

2 to 4, in the transmission case 17, a first gear 29 is provided at the end of the rear axle 25, a second gear 30 is provided at the end of the drive shaft 26, and an idler gear 31 is provided via an intermediate shaft. These components constitute a gear transmission means (power transmission mechanism) 32 for transmitting power from the rear axle 25 to the drive shaft 26.
The transmission case 17 is divided into left and right parts. Hereinafter, among the divided transmission cases 17, the one on the traveling vehicle body 3 side is referred to as a first divided transmission case 17a, and the one on the opposite side of the traveling vehicle body 3 that faces the first divided transmission case 17a. This is referred to as a two-part transmission case 17b.

Each of the divided transmission cases 17a and 17b is shaped to be recessed outward in the facing direction so that a space for housing the gear transmission means 32 can be formed in a state of being joined to face each other.
Each of the divided transmission cases 17a and 17b has a flange portion 33 on the periphery of the joint portion to be joined to each other. A bolt insertion hole is formed in the flange portion 33 and is connected via a fixing means such as a bolt fastening means. Yes.
The first divided transmission case 17a is integrally formed by casting at the left and right outer ends of the rear axle case 19. In this way, by forming the first split transmission case 17a on the traveling vehicle body 3 side integrally with the rear axle case 19, the first transmission case 17 does not get in the way when the gear transmission means 32 is assembled, and the assembly is easy. It is also easy to maintain.

The split transmission case 17 provided on the rear axle case 19 side may be configured separately from the rear axle case 19 and attached to the rear axle case 19 to be integrated.
In FIGS. 1 and 2, a swing shaft 22 that swingably supports the track frame 16 is provided below the rear axle 25 and the drive shaft 26. The swing shaft 22 is disposed at an intermediate position between the rear axle 25 and the drive shaft 26 in the front-rear direction. Accordingly, both the swing shaft 22 and the drive shaft 26 are disposed behind the rear axle 25, whereby the traveling device is disposed as far back as possible with respect to the traveling vehicle body 3. Accordingly, the distance between the front wheel and the traveling device can be increased, whereby the traveling vehicle body 3 can be supported more stably. The swing shaft 22 supports a track frame 16 including front and rear driven wheels 12 and 13 and a wheel 14 so as to be swingable about its axis.

  The swing shaft 22 is supported by a support 24 provided at the lower part of the transmission case 17. The support 24 is fixed to the traveling vehicle body 3 via a mounting portion 21 formed in the second split transmission case 17b and the rear axle case 19. The attachment portion 21 is formed of a columnar projection protruding downward from the lower portion of the transmission case 17, and a plurality of projections are formed on the lower surface of the rear axle case 19 and the lower surface of the second split transmission case 17b. ing. A screw hole is formed in the front end surface (lower surface) of the projecting portion so that the support 24 can be fixed via fixing means such as a bolt.

The support 24 of the swing shaft 22 includes a holding member 34 that holds the swing shaft 22 and a support frame 35 that supports the holding member 34. The holding member 34 is formed in a cylindrical shape, and the support frame body 35 supports the holding member 34 along the left-right direction (axle direction).
The support frame 35 is connected and fixed to the second split transmission case 17b and the rear axle case 19 through bolts at the upper wall portion thereof.
Since the mounting portion 21 is provided in both the second split transmission case 17 b and the rear axle case 19, when the support frame 35 is attached to these, the support frame body 35 becomes the first split of the rear axle case 19. Both the transmission case 17a and the second divided transmission case 17b are held together. Therefore, by holding the first divided transmission case 17a and the second divided transmission case 17b by the support frame body 35 (supporting tool 24), it is possible to further strengthen the coupling state between the two, thereby increasing the assembly strength of each member. It becomes possible.

Further, the swing shaft 22 is housed in the holding member 34, and the outer end in the left-right direction protrudes outward. The swing shaft 22 supports the track frame 16 by fixing a plate-like attachment portion 16 a provided on the upper surface of the track frame 16 to the outer end thereof.
A mounting portion 36 for the driver's seat protection device 4 is provided on the left and right rear axle cases 19, and the support seat 4c of the support 4b of the driver's seat protection device 4 is attached to the mounting portion 36, thereby protecting the driver's seat. The device 4 is fixed to the traveling vehicle body 3. The attachment portion 36 is provided on the upper surface of the rear axle case 19 and the upper surface of the transmission case 17.

The attachment portion 36 includes a support base 37 of the driver's seat protection device 4 and a support portion 38 that supports the support base 37.
In FIG. 4, the support base 37 includes a bottom plate 41 and a support wall 42 erected on the bottom plate 41. The support wall 42 is formed by standing one end of an L-shaped plate material on the front portion of the upper surface of the bottom plate 41. On the support wall 42, a horizontal upper wall portion 43 is formed above the bottom plate 41, and a front wall portion 44 is formed along the vertical direction with respect to the bottom plate 41 at the front portion of the upper wall portion 43. A side wall 45 is erected on the inner side of the support wall 42 in the left-right direction. The side wall 45 is integrated with the support wall 42 to reinforce the support wall 42.

A vibration absorbing member 46 that absorbs vibration of the traveling vehicle body 3 is provided on the upper wall portion 43 of the support wall 42. The vibration absorbing member 46 is supported by the upper wall portion 43 of the support wall 42. Further, the vibration absorbing member 46 is provided so as to sandwich the upper wall portion 43 in the vertical direction, and a mounting bolt 46 a protruding upward from the upper surface of the upper wall portion 43 serves as a support column of the driver's seat protection device 4. The support seat 4c of 4b is supported.
On the other hand, a vertical through hole is formed in the support seat 4c, and the support seat 4c is attached by inserting a mounting bolt 46a into this hole and screwing a nut into the mounting bolt 46a and fastening it. It is connected to the portion 36.

The vibration absorbing member 46 is fixed to the upper surface of the support wall 42 via bolts via a square plate-like fixed plate portion 47.
The rear lower part of the mounting part 36 is cut out so that the front upper part of the transmission case 17 enters. The transmission case 17 and the mounting portion 36 are arranged to overlap in the left-right direction.
That is, the bottom plate 41 has a rear portion cut away to form a cutout portion 41a, and has an L-shaped plate shape in plan view. And the transmission case 17 and the attaching part 36 are made to overlap by making the front upper part of the transmission case 17 enter into this notch part 41a.

The support portion 38 includes a front portion of the upper surface of the second split transmission case 17b, two protrusions 48 provided at two locations in the front-rear direction, and two portions protruding from the upper surface of the rear axle case 19. It consists of a protrusion 50.
Accordingly, the support base 37 is placed on the two protrusions 48 of the support portion 38 provided on the second split transmission case 17b and the two support portions 38 (protrusion portions 50) provided on the rear axle case 19 side. And it is connected and fixed at four places by fixing means such as bolts. The support portion 38 that supports the support base 37 may be provided in the first split transmission case 17 a and the rear axle case 19.

As described above, the rear portion of the attachment portion 36 is cut out, the front upper portion of the transmission case 17 is inserted into the cutout portion 41a, and the attachment portion 36 and the transmission case 17 are overlapped in the left-right direction, thereby attaching the attachment portion. 36 and the transmission case 17 can reduce the distance (crawler distance) between the crawler traveling devices 2 without interfering with each other on the rear axle case 19, and this traveling vehicle travels in a narrow place in an orchard or the like. It is useful as possible.
Further, as described above, since the transmission case 17 extends rearward and upward, the upper end of the transmission case 17 can be disposed as far as possible from the driver's seat protection device 4. The space between the driver 17 and the driver's seat protection device 4 can be secured widely, and therefore the foot space of the driver's cab in the upper structure 4a of the driver's seat protection device 4 can be increased.

The present invention is not limited to the above-described embodiment, and various modifications can be made as follows.
As a vehicle employing the present invention, for example, a vehicle in which a crawler unit is attached instead of a front wheel, a vehicle in which four crawler units are independently attached in place of front and rear wheels, and the like may be used.
The transmission case 17 extends rearwardly and upwardly, but extends rearwardly, forwardly, or forwardly upwardly so that the drive shaft 26 is disposed rearwardly, forwardly, or forwardly upwardly of the rear axle 25. Also good.
The swing shaft 22 is disposed below an intermediate position between the rear axle 25 and the drive shaft 26. However, the swing shaft 22 may be disposed below or in front of the rear axle 25 and below or behind the drive shaft 26. Good.

  The mounting portion 36 of the driver's seat protection device 4 is formed integrally with the first divided transmission case 17a and the rear axle case 19, or the mounting portion 19 of the support 24 is formed only on the first divided transmission case 17a and the rear axle case 19 side. May be.

It is a rear view which shows the principal part of this invention. It is the same side view. It is a top view which shows a transmission case and an attaching part. It is the same side view. It is a side view which shows the whole traveling vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling vehicle 2 Crawler traveling device 3 Traveling vehicle body 4 Driver's seat protection device 11 Drive wheel 16 Track frame 17 Transmission case 19 Rear axle case 21 Mounting portion 22 Swing shaft 24 Supporting tool 25 Rear axle 26 Driving shaft 36 Mounting portion

Claims (4)

A left and right rear axle case (19) projects from the rear of the traveling vehicle body (3), and a mounting portion (36) is provided on the left and right rear axle case (19) to provide a support column (4b) for the driver's seat protection device (4 ). And a transmission case (17) having transmission means (32) for transmitting power from the rear axle (25) to the drive shaft (26) at the ends of the left and right rear axle cases (19). The track frame (16) of the travel device (2) is supported via the swing shaft (22), and the drive shaft (26) of the crawler travel device (2) is attached to the drive shaft (26) at the end of the transmission case (17). 11)
The transmission case (17) extends obliquely rearward and upward from the end of the rear axle case (19), and the drive shaft (26) is disposed rearwardly and upwardly of the rear axle (25). 36) is provided on the upper surface of the rear axle case (19) and the upper surface of the front portion of the transmission case (17) ,
The rear lower part of the attachment part (36) is cut out, and the front upper part of the transmission case (17) is inserted into the notch part (41a), and the rear upper part of the transmission case (17) is connected to the attachment part (36). A traveling vehicle characterized in that it is overlapped in the left-right direction and the up-down direction . The mounting portion (36) is provided on the support base (37) that supports the support column (4b) of the driver's seat protection device (4), the rear axle case (19), and the transmission case (17). The traveling vehicle according to claim 1, further comprising a support portion (38) for supporting the base (37) . The swing shaft (22) of the track frame (16) is disposed below the rear axle (25) and the drive shaft (26) and at an intermediate position in the front-rear direction thereof, and supports the swing shaft (22). The traveling vehicle according to claim 1 or 2, wherein the mounting portion (21) of the support (24) is formed in a transmission case (17) and a rear axle case (19) .   The transmission case (17) is divided into left and right parts, and the divided transmission case (17a) on the traveling vehicle body (3) side is integrally formed with the rear axle case (19). The traveling vehicle according to any one of 3.

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