JPH11127625A - Traveling vehicle for working use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traveling vehicle for working use, so designed that the left and right of a front accelerator case are connected, via respective left and right main frames, to a rear accelerator case so as to not only afford expansion of the space between the left and right main frames but also reduce the overhung load of the front accelerator case. SOLUTION: This traveling vehicle 1 for working use, which is equipped with a front accelerator case 6 axially supporting front wheels, a transmission case 4, a rear accelerator case 8 axially supporting rear wheels, and a pair of left and right main frames 11 turning longitudinally, is so designed that the left and right of the front accelerator case 6 are connected, via the respective left and right main frames 11, to the rear accelerator case 8 so as to afford expansion of the space between the left and right main frames 11 as well as construct a robust frame through making use of the respective mechanical strengths of the front accelerator case 6 and the rear accelerator case 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of working vehicles such as riding rice transplanters.

[0002]

2. Description of the Related Art Generally, a working vehicle such as a rice transplanter of this type is provided with a pair of left and right main frames facing in a front-rear direction, and a transmission case and a front axle case are supported at the front of the main frames. Some are configured to support the rear axle case at the rear of the main frame.

[0003]

Conventionally, however, the rear axle case and the transmission case are connected via the main frame, and the front axle case is projected from the transmission case.
It was difficult to ensure a wide left-right spacing of the main frame, and there was a disadvantage that a large cantilever load was applied to the connection between the front axle case and the transmission case. Therefore, in the related art, the above-described disadvantage has been solved by increasing the width of the transmission case left and right, but as a result, a new disadvantage has arisen in that the transmission case becomes large.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made to solve these problems, and comprises a front axle case for supporting left and right front wheels, and a front axle case. In a working vehicle equipped with a transmission case attached to an axle case, a rear axle case supporting the left and right rear wheels, and a pair of left and right main frames facing the front-rear direction, the left and right sides of the front axle case are respectively left and right. It is connected to the rear axle case via the main frame. In other words, since the front axle case is directly supported by the main frame, the left and right spacing of the main frame cannot be increased, but the cantilever load of the front axle case can be reduced, and as a result, the transmission case The width of the transmission case can be reduced by making the left and right width as narrow as possible. In addition, since the transmission case can be removed without disconnecting the main frame, the detachability of the transmission case can be improved.

[0005]

Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling body of a riding rice transplanter. The traveling body 1 receives an engine 2 mounted on a front part of the body and power of the engine 2 via a belt-type continuously variable transmission mechanism 3. A transmission case 4, a front axle case 6 for driving left and right front wheels 5 with front wheel power input from the transmission case 4, a rear axle case 8 for driving left and right rear wheels 7 with rear wheel power input from the transmission case 4, and the like. The planting work machine 10 is connected to the rear of the machine body via an elevating link mechanism 9.
All of these basic configurations are conventional.

Each of the axle cases 6 and 8 has a lateral case portion 6a, 8a facing in the left-right direction, and the lateral case portions 6a, 8a.
a, extending downward from the outer end of the vertical case (final case) 6b, 8b, and the vertical case 6b, 8
The rear axle case 8 supports the left and right rear wheels 7 with a single case body, while the front axle case 6 The left and right front wheels 5 are formed to be supported by a pair of left and right case bodies. The pair of left and right front axle cases 6 are integrally mounted on the left and right side surfaces of the transmission case 4, in other words, the transmission case 4 is provided between the left and right front axle cases 6. Assembled integrally.

Reference numeral 11 denotes a pair of left and right main frames facing the front-rear direction. The front end portions of the main frame 11 are previously integrated via a front connecting plate 12, while the rear end portions are connected to the rear side. They are integrated beforehand via a connection plate 13. The rear axle case 8 is integrally connected to the rear end of the main frame 11 as in the related art, but the transmission case 4 is not connected to the front end of the main frame 11 as in the related art. The left and right front axle cases 6 are integrally connected via a bracket 14 respectively. That is, since the pair of left and right front axle cases 6 provided on the left and right sides of the transmission case 4 are connected to the rear axle case 8 via the left and right main frames 11, respectively, the transmission case 4 is attached to the front end of the main frame 11. Can be widened as compared to the case where
Front axle case 6 and rear axle case 8
The main frame 11 can support the transmission case 4 via the left and right front axle cases 6 so that the front axle case 6 is left (see FIG. 1). The transmission case 4 can be removed with the connection to the main frame 11 unnecessary. Incidentally, reference numeral 15 denotes a cylinder mounting frame provided between the front and rear connection plates 12 and 13, and 16 denotes a top link 1.
7 is a lift cylinder that raises and lowers the planting work machine 10 via.

A front frame 18 supports the front side of the engine 2. The front frame 18 includes a horizontal frame portion 18a that supports the front side of the engine 2 in a left-right posture, and left and right ends of the horizontal frame portion 18a. The pair of left and right vertical frame portions 18b extending rearward from the portion are formed in a substantially U-shape in plan view (an inverted U-shape).
Are integrally connected via connection frames 19 and 20 facing in the left-right direction. That is, since the front frame 18 is connected to the main frame 11 having a wide left-right space, the supporting strength of the front frame 18 can be increased, and the front frame 18 having a wide left-right width can be supported. ing.

Reference numerals 21 and 22 denote a pair of front and rear engine frames which are integrally installed in the front part of the front frame 18 (between the left and right vertical frame portions 18b) so as to face left and right.
Of the engine frames 21, 22, a pair of left and right front engine support plates 23 that are connected (welded) to the horizontal frame portion 18 a are welded to the front engine frame 21, while the front engine frame 21 is connected to the rear engine frame 22. Rear engine support plate 25 connected (bolt-fixed) to the front of transmission case 4 via plate 24
Are welded, and each engine support plate 2
The reference numerals 3 and 25 support the engine 2 in a vibration-proof manner via a vibration-proof member 26 and an engine base 27.

By the way, the front frame 18
The vertical frame portion 18b of the front frame 18 is the same up to the middle portion of the main frame 11 (the rear end position of the main step 28M), although it is not limited to supporting the engine 2 but is also used as a support frame such as the step 28. Since it extends at the height, the seam between the front step 28F and the main step 28M, which are divided and formed front and rear, can be supported without any level difference.
Since it is arranged at a position higher than the main frame 11 (above the upper end of the front wheel in a side view), it is possible to eliminate inconveniences such as the main frame 11 being obstructed when the step 8 is assembled. Has become.

The front frame 18 is formed substantially along the outer peripheral portion of the step 28 in a plan view, so that a wide space is secured inside the front frame 18. . That is, since a large space can be secured between the front frame 18 and the engine 2 and between the front frame 18 and the continuously variable transmission mechanism 3, maintenance work (belt) of the engine 2 and the continuously variable transmission mechanism 3 can be performed. Replacement work, etc.) can be easily performed.

In the vehicle constructed as described above, a pair of left and right main frames 11 are provided which face in the front-rear direction.
While supporting the front axle case 6 and supporting the rear axle case 8 at the rear of the main frame 11, the front end of the main frame 11 is not connected to the transmission case 4 as in the related art. Since the main frame 11 is connected to the front axle case 6, the left-right space between the main frame 11 and the front axle case 6 and the rear axle case 8 can be utilized to form a strong frame. . Therefore, unlike the related art, it is not necessary to particularly widen the left and right width of the transmission case 4, and as a result, the transmission case 4 can be reduced in size and weight.

The main frame 11 supports the transmission case 4 via the left and right front axle cases 6, so that the transmission case 4 can be removed with the front axle case 6 left. The detachability of the case 4 can be improved.

Further, since the front frame 18 supporting the engine 2 is connected to the main frame 11 having a wide left-right space, the support strength of the front frame 18 cannot be increased. Can also respond.

The vertical frame portion 18b of the front frame 18 is extended to an intermediate portion of the main frame 11, and the front frame 18 is
Front Step 2
There is no inconvenience as to whether the joint between 8F and the main step 28M can be supported without a step, or the main frame 11 is in the way during step assembly.

Further, since the front frame 18 is formed substantially along the outer peripheral portion of the step 28 in plan view, a large space can be secured inside the front frame 18, and as a result, It is possible to improve the maintainability of the engine 2 and the continuously variable transmission mechanism 3 as long as the engine can be effectively used.

The present invention is, of course, not limited to the above-described embodiment. For example, in the above-described embodiment, a left / right split front axle case is employed. Needless to say, it can be implemented even with an axle case.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of an engine mounting portion.

FIG. 4 is a perspective view showing a frame structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 2 Engine 4 Transmission case 6 Front axle case 8 Rear axle case 11 Main frame 18 Front frame 18a Horizontal frame part 18b Vertical frame part

Claims (1)

[Claims] 1. A front axle case that supports left and right front wheels, a transmission case that is attached to the front axle case, a rear axle case that supports left and right rear wheels, and a pair of left and right main frames that face in the front-rear direction. A work vehicle having a front axle case connected to a rear axle case via left and right main frames, respectively.