JPH0740852A - Both driven wheel installing structure for farm dolly - Google Patents

Abstract

PURPOSE:To install both driven wheels effectively in both side rear parts of a car body lower part so that rectilinearity of a car body can be improved much better while rotating them similarly with both king pins as their center by being driven by both driving wheels. CONSTITUTION:A farm dolly is constituted by arranging both driving wheels 4 and 4 and caster type both driven wheels 5 and 5 respectively so as to be situated in front and in rear on both sides in the advancing direction of a car body lower part. Vertically erected both king pins 9 and 9 are arranged on both sides of a car body, and both support arms 11 and 11 are arranged so as to be pivoted/suspended directly or indirectly by/from both king pins 9 and 9, and both support arms 11 and 11 are interlocked with/connected by a connecting member 15 so as to be rotatable similarly, and in the lower end parts of both support arms 11 and 11, both driven wheels 5 and 5 are supported pivotally respectively so that wheel axes 5a and 5a are situated inside of the axes 9a and 9a of both king pins 9 and 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting both driven wheels of an agricultural vehicle on which both driving wheels and caster-type driven wheels are mounted so as to be located on both front and rear sides of a lower portion of a vehicle body.

[0002]

2. Description of the Related Art Conventionally, an agricultural transport vehicle having two drive wheels and two caster-type driven wheels respectively located at the front and rear of the lower part of the vehicle body has been disclosed.
As can be seen in Japanese Patent No. 26591, both driven wheels are usually mounted so as to be positioned outside the axial center of both kingpins.

[0003]

However, since both driven wheels are mounted so axially, when one of the driven wheels rides on the slope of the ridge when traveling through the ridge in a field, the slope of the ridge is further increased. Since the force to ride on the ridge acts, the rider rides a large amount on the ridge, and the straightness of the vehicle body is poor, making it difficult to drive and steer.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised so as to solve such a problem and further improve the straightness of the vehicle body. In an agricultural transport vehicle that is configured by deploying both drive wheels and caster-type driven wheels respectively, both kingpins that are vertically installed are provided on both sides of the vehicle body, and the kingpins are directly or indirectly supported by the two kingpins. Both supporting arms are provided vertically, and the supporting arms are interlockingly linked by a connecting member so that the supporting arms can be similarly rotated, and the wheel shafts are provided at the lower ends of the supporting arms on the inner side of the axial centers of the king pins. Both driven wheels are axially mounted so as to be positioned.

[0005]

Therefore, in a state where both driven wheels are driven while traveling by both driving wheels, the wheel shafts of both driven wheels are positioned inside the shaft centers of both kingpins and are mounted so as to rotate similarly. Therefore, for example, when traveling on a ridge in a field, if one of both driven wheels tries to ride on the ridge, the driven wheel acts as a force to descend the inclined surface of the ridge, and at this time, the other driven wheel. Since it is floating above the ground, both driven wheels similarly rotate around the center of the axes of both kingpins and go down the inclined surface of the ridge, maintaining straightness without impairing the straightness of the vehicle body. Can effectively drive in the furrow.

[0006]

FIG. 2 is a side view schematically showing an agricultural transport vehicle, in which a fuel tank 7 is installed between the intermediate portions of both handle rods 6 and 6 standing upright behind the loading platform 22 in the traveling direction.
Both drive wheels 4 and 4 which can be transmitted from the engine 2 on the frame 1 by a transmission member in the transmission cover 3 are mounted on both sides of the front lower part of the right side of the right handlebar 6 shown in FIG. Is equipped with a change lever 23, and the vehicle body is composed of the frame 1 and the bed 22.

On both sides of the lower rear part of the loading platform 22, which is behind the two drive wheels 4 and 4, two upstanding support cylinders 8 and 8 are fixedly installed on the frame 1, and the support cylinders 8 and 8 are attached to the support cylinders 8 and 8. Upper ends of L-shaped support plates 10 and 10 extending outwardly opposite to each other are fixedly attached to the lower ends of the king pins 9 and 9 which are freely rotatably fitted to each other. Both knuckle arms 2 fixed to the lower end and extending forward in parallel
A connecting member 15 serving as a tie rod is provided between the tip portions of 4 and 24.
, The king pins 9 and 9 are fixed to the support cylinders 8 and 8, and the L-shaped support plates 10 and 10 and the knuckle arms 24 and 24 that are integrally formed are connected to the king pins 9 and 9. It may be loosely fitted to the shaft tube 2 and may be inserted into and fixed to the upright portions at both ends of both L-shaped support plates 10 and 10.
The horizontal pins 13 and 13 are fitted to the long pins 27 and 5 respectively so that the locking pin 26 fits in the long groove 27 and can be rotated by a predetermined angle. Both ends of the connecting shaft 16 are connected to the inner ends of both the horizontal shafts 13, 13 via the universal joints 14, 14 located at, respectively. The upper ends of the two support arms 11 and 11 thus fixed are fixed respectively, and when the support arms 11 and 11 are tilted forward and backward, the pin 28 on the arm side causes the engagement springs 29a and 29b on the support plates 10 and 10 side. Wheel shafts 5a and 5a of the driven wheels 5 and 5 which are provided so as to be engaged with the support arms 11 and are axially mounted inwardly of the lower portions of the support arms 11 and 11 have shaft centers 9a and 9a of the king pins 9 and 9, respectively.
Both support arms 11, 11 are configured by being bent toward the inner side of the vehicle so as to be closer to the inner side of the vehicle.

A lower portion of a passive member 17 having an adjuster 17a and a roller 17b on the upper and lower sides is fitted and fixed to an intermediate portion of the connecting shaft 16, and a pedal is provided at a rear end on both sides of the passive member 17. Left and right pedal members 19, 21 having
The pedal member 1 on the left side in FIG.
A lower boss 31 of a support plate 30 suspended from the front part of 9 is loosely fitted to the connecting shaft 16, and a pressing member 18 capable of abutting the adjuster 17a of the passive member 17 is fixed to the upper end of the pedal member 19. A tension spring 37, which is provided and is capable of pulling and urging the middle portion of the pedal member 19 until it abuts against the lower surface of the upper support cylinder 32 fixed to the frame 1, is provided on the upper end portion of the pedal member 19 and the bed. The upper portion of the pedal member 21 on the right side in FIG. 1 is fixed to the lower portion of the rotating arm 33 which is connected to the frame 1 on the side of 22 and pivotally supports the intermediate portion of the supporting cylinder 32. A pressing member 20, which can abut against the roller 17b of the passive member 17 from below, is provided on the upper portion of the frame 34 protruding from the lower portion, and the load carrier 2 of the tension spring 35 is provided on the L portion of the rotating arm 33.
The stopper 36 is provided so that it can abut against the upper frame 1 by pulling to the 2 side.

Therefore, while both driven wheels 5 and 5 are driven while traveling by both drive wheels 4 and 4, both driven wheels 5 and
The wheel shafts 5a and 5a of the shaft 5 are shaft centers 9 of both kingpins 9 and 9.
Since they are located inside the a and 9a, respectively, and are pivoted to rotate in the same manner, for example, when traveling on a ridge in a field, when one of the driven wheels 5 and 5 tries to ride on the ridge, The driving wheel 5 exerts a force to get down the inclined surface of the ridge,
At this time, the other driven wheel 5 floats above the ground,
Both driven wheels 5 and 5 are shaft centers 9a and 9a of both kingpins 9 and 9.
Since the vehicle turns around the center in the same manner and tries to get off the inclined surface of the ridge, the straightness of the vehicle body can be maintained and the ridge can be effectively traveled without impairing the straightness of the vehicle body.

Further, both driven wheels 5 and 5 are driven while rotating around the center axes 9a and 9a of the king pins 9 and 9, respectively, but the machine body is switched from forward to reverse as shown by arrow a. In this case, as shown in FIG.
When the roller 17b is depressed as shown by the arrow B until the roller 17b hits the pressing member 20, the pressing member 18 moves the adjuster 17
While pressing a, the connecting pin 16 engages the engaging pin 26 with the long groove 27.
By rotating the support arms 11 and 11 to the backward tilted state as shown in FIG. 9, the support arms 11 and 11 can be rotated until they hit the other end, and when the aircraft is switched from the backward traveling state to the forward traveling state. , The pedal member 2 as shown in FIG.
When 1 is stepped on as indicated by arrow C, the pressing member 20 hits the roller 17b to rotate the connecting shaft 16, and the two supporting arms 11, 11 can be transferred to the rearward tilted state.

In implementing the present invention, the L-shaped support plate 10 and the support arm 11 may be indirectly formed as separate members as in the embodiment, or may be directly formed integrally with each other. You can

[0012]

As described above, according to the present invention, both drive wheels (4),
While both driven wheels (5) and (5) are driven while traveling by (4), the wheel shaft (5) of both driven wheels (5) and (5) is driven.
Since a) and (5a) are respectively positioned on the inner sides of the axes (9a) and (9a) of both kingpins (9) and (9) and are pivoted so as to rotate similarly, for example, in a field. When driving in the ridge, when both drive wheels (5) and (5) try to ride on the ridge, the driven wheel (5) is acted on by the force to get down the inclined surface of the ridge, so that both driven wheels ( 5) and (5) similarly rotate around the center axes of both kingpins and go down the inclined surface, so that the straightness of the vehicle body can be maintained and the straightness can be effectively traveled without impairing the straightness. As an agricultural transport vehicle having both caster-type driven wheels (5), (5), it has the feature that it can be suitably implemented with further improved runnability.

[Brief description of drawings]

FIG. 1 is a rear view schematically showing an agricultural transport vehicle according to an embodiment of the present invention.

FIG. 2 is a side view schematically showing the side surface of FIG.

FIG. 3 is a plan view schematically showing FIG.

FIG. 4 is a side sectional view showing a part of FIG. 2 in an enlarged sectional view.

FIG. 5 is a plan view showing a part of FIG. 1 in an enlarged manner.

FIG. 6 is a vertical sectional view showing a part of FIG. 5 in section.

FIG. 7 is a side view showing a part of FIG.

FIG. 8 is a side view showing the operating state of FIG.

9 is a side view showing the operating state of FIG. 7. FIG.

[Explanation of symbols]

 4 Drive Wheel 5 Driven Wheel 9 King Pin 9a Shaft Center 5a Wheel Shaft 11 Support Arm 15 Connecting Member

Claims (1)

[Claims] 1. An agricultural transport vehicle comprising drive wheels (4), (4) and caster-type driven wheels (5), (5) respectively located at the front and rear of the lower part of the vehicle body in the traveling direction. At both sides of the vehicle body, both kingpins (9), (9) are installed upright on both sides, and the both kingpins (9), (9) are provided.
Both support arms (11), (11) vertically and directly or indirectly rotatably supported by the two support arms (11),
(11) is linked and linked by a connecting member (15) so that the support arm (11) can be similarly rotated,
At the lower end of (11), the king pins (9), the shaft centers (9a) of (9), and the wheel shafts (5a), (5) on the inner side of (9a).
A structure for mounting both driven wheels, characterized in that both driven wheels (5), (5) are axially mounted so that a) is positioned.