JPH068860A - Supporting frame connection structure for agricultural tractor - Google Patents

Abstract

PURPOSE:To constitute the left and right supporting frames in pair for a cabin and a frame so as to be connection-supported at the rear part of a machine body with a sufficient strength and so that also a supporting bracket for top link of a three-point link mechanism can be reinforced, as for an agricultural tractor. CONSTITUTION:The lower edges of the left and right supporting frames 14 in pair are connected with a rear axle case 5 for rear wheels 2 which projects left and right from the rear part lower part of a transmission case 4, and the intermediate part in the vertical direction of the supporting frame 14 is connected with ths rear part upper part of the transmission case 4. A bracket 17 fixed at the intermediate part in the vertical direction of the supporting frame 14 is connected with a supporting bracket 10 for top link which is fixed at the rear part upper part of the transmission case 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an agricultural tractor,
The upper structure of the driver's cabin, the roof for awnings,
Also, the present invention relates to a structure for connecting a pair of left and right support frames that support the LOPS frame and the like to the airframe.

[0002]

2. Description of the Related Art In an agricultural tractor equipped with a cabin, which is an example of an upper structure of a driving section, for example,
Some have a structure as disclosed in Japanese Patent Publication No. 9985. In this structure, FIG. 1 and FIG.
As shown in the figure, the rear axle case for the rear wheels that protrudes to the left and right from the lower rear portion of the transmission case (see the third publication of the above publication).
21) in the drawing is connected to the lower ends of a pair of left and right support frames (22 in FIGS. 1 and 3 of the publication). The rear part of the cabin is connected to the upper ends of the left and right support frames.

[0003]

With the above-mentioned structure, the left and right support frames are only connected to the rear axle case only at their lower ends. Therefore, when a load is applied from the cabin to the upper end of the support frame in the fore-aft direction or the left-right direction, the length of the support frame becomes a moment arm, and the moment due to the above-mentioned load is applied to the lower end of the support frame and the rear axle case. Therefore, there is room for improvement in terms of improving the connection strength in the vicinity of the connection point in the support frame. It is an object of the present invention to allow a pair of left and right support frames for an upper structure of a driving part to be connected to a rear part of an airframe with a structure having a reasonable and sufficient strength.

[0004]

The feature of the present invention resides in the following structure in the support frame connecting structure of the agricultural tractor as described above. In other words, the rear axle case for the rear wheels, which protrudes to the left and right from the lower rear portion of the mission case, is connected to the lower ends of the pair of left and right support frames for supporting the upper structure of the driving section, and The middle part in the vertical direction is connected to the upper rear part of the mission case, and the brackets fixed to the upper and lower intermediate parts of the left and right support frames are fixed to the upper part of the rear rear part of the mission case. Connected to.

[0005]

When configured as in the present invention, for example, FIGS.
As shown in Fig. 2, the lower ends of the left and right support frames 14 are connected and fixed to the rear axle case 5, and the vertically middle parts of the left and right support frames 14 are connected to the upper rear part of the mission case 4 (Fig. 2 and In the structure of FIG. 3, the bracket 1
The support frame 14 and the mission case 4 are connected to each other via 7). With the above structure, the left and right support frames 14 are connected to the fixed portion (the rear axle case 5 and the rear upper portion of the transmission case 4) at two locations, the lower end and the intermediate portion. Thereby, the support frame 14
Even if a load is applied to the upper part of this, this load is distributed and supported at two locations, the lower end and the middle part. In this case, since the connection point at the lower end (rear axle case 5) and the connection point at the middle portion (upper rear part of the transmission case 4) are separated, a moment to tilt the support frame 14 back and forth or left and right is applied. However, this moment is distributed to two places,
It is firmly supported at these two connecting points that are separated from each other.

Further, as shown in FIG. 2, the brackets 17 of the left and right support frames 14 are connected to the support brackets 10 for the top links 11 (see FIG. 1) (members constituting the three-point link mechanism). In the conventional structure, the support bracket 10 for the top link 11 has the mission case 4
In many cases, the support bracket 10 is connected to two positions of the mission case 4 and the bracket 17 of the support frame 14, whereas the support frame 14 and the bracket 17 are connected to each other. It serves as a reinforcing member for the bracket 10, and the support bracket 10 is firmly connected and supported.

[0007]

As described above, by supporting the left and right support frames at two positions separated from each other, it is possible to firmly support the support frame while avoiding concentration of load and moment at the connection point of the support frames. As a result, it was possible to improve the durability near the connection point of the support frame. Since the left and right support frames can also be used as the reinforcing members of the support bracket for the top link of the three-point link mechanism, the durability of the support bracket for the top link can be improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an operating unit 3 is provided at the rear of the machine body supported by front wheels 1 and rear wheels 2, and a mission case 4 is provided below the operating unit 3 to form an agricultural tractor. As shown in FIGS. 2, 3 and 1, a rear axle case 5 for supporting the rear wheels 2 projects leftward and rightward from a lower rear portion of the mission case 4. A hydraulic cylinder unit 7 for vertically swinging a pair of left and right lift arms 6 is connected to an upper surface of a rear portion of the mission case 4, and a pair of left and right lower links 8 are vertically swung at a lower rear portion of the mission case 4. The pair of left and right lift arms 6 and the lower link 8 are movably supported and are connected by a linking rod 9.

A pair of left and right plate-shaped support brackets 10 are connected to the rear surface of the hydraulic cylinder unit 7, and one top link 11 is provided at the tip of the support bracket 10.
Is mounted so that it can swing up and down. With the above structure, a single top link 11 and a pair of left and right lower links 8 constitute a three-point link mechanism, and various working devices (not shown) such as a rotary tiller are added to the three-point link mechanism. After connecting, the lift arm 6 moves up and down the three-point link mechanism and the working device.

In this agricultural tractor, a gate-type lops frame 12 and a sunshade roof 13 are provided as the upper structure of the operation unit 3. Next, the support frame 14 that supports the lops frame 12 and the roof 13 will be described. As shown in FIGS. 2 and 3, a pair of left and right support frames 14 are formed in an inverted L shape in a front view (see FIG. 2), and the lower ends of the left and right support frames 14 are brackets 15.
It is connected and fixed to the rear axle case 5 via. Then, in the vertical middle portion of the left and right support frames 14,
A pair of brackets 17 are welded and fixed inward.

One connecting member 16 is welded and fixed in a reverse L-shape in a side view (see FIG. 3) across both lower surfaces of the pair of support brackets 10 for the top link 11. As a result, the left and right lower surface portions of the connecting member 16 and the bracket 17 of the support frame 14 are jointly fixed to the upper rear portion of the transmission case 4 by the bolts 18. The left and right upper surface portions of the connecting member 16 and the bracket 17 of the support frame 14 are connected and fixed by bolts 19. Then, as shown in FIG. 2, the left and right support frames 1
A frame 20 is erected and connected across the upper end of the frame 4.

Next, the structure of the connecting portion between the upper ends of the left and right support frames 14 and the lops frame 12 will be described. As shown in FIGS. 3, 4, and 5 (a), the support portion 21 provided with a pair of convex portions 21 a on the upper ends of the left and right support frames 14.
Is fixed, and the lower end 12a of the LOPS frame 12 is fixed.
Are attached to the support portion 21 by bolts 22.
The lower end 12a of the lops frame 12 also has a pair of protrusions 12
Since b is provided, the LOPS frame 12 can be tilted rearward around the horizontal axis P1 of the bolt 22 (see the chain double-dashed line in FIG. 1), but the protrusions 12b and 21a are brought into contact with each other as shown in FIG. Further, it is configured so that the operator cannot tilt it forward from the posture shown by the solid line in FIG.

Next, the structure for fixing the LOPS frame 12 in the posture shown by the solid line in FIG. 1 will be described. Figures 3,4
As shown in 5 (a), around the horizontal axis P2 of the support portion 21,
The support member 23 is swingably supported, and the support member 2
A convex portion 23a having a triangular shape in a side view is fixed to the tip of 3. A bolt 24 with a knob is rotatably attached to the support member 23, and an E washer (not shown) for retaining is attached to an inner portion of the bolt 24 with a knob.

With the above-described structure, as shown in FIG. 1 and FIG. 5A, in the state in which the rope frame 12 is erected, the convex portion 23a of the supporting member 23 is formed on the lower convex portion 21a of the supporting portion 21.
And the protruding portion 12b on the upper side of the ROPS frame 12 and the bolt 24 with a knob is screwed into the screw hole 21b (see FIG. 4) of the supporting portion 21 to fix the supporting member 23 and the protruding portion 23a. . As a result, the LOPS frame 12 is fixed in the posture shown by the solid line in FIGS. 1 and 5A.

As shown in FIGS. 3 and 4, a spiral spring 25 is attached between the bolt 22 and the support member 23. The spiral spring 25 allows the support member 23 to move.
The paper is urged counterclockwise. As a result, even if the bolt 24 with knob is loosened with the support member 23 fixed, the support member 23 and the convex portion 23a are urged by the spiral spring 25 toward the entering side between the convex portions 12b and 21a. Therefore, the support member 23 and the convex portion 23a are
Does not come off from between b and 21a, or rattle. Then, when the knob bolt 24 is loosened from the state shown in FIG. 5A and the support member 23 and the convex portion 23a are removed from between the convex portions 12b and 21a as shown in FIG. As indicated by the double-dotted line of FIG. 1 and FIG.
2 can be tilted backwards to operate.

[Other Embodiments] In the embodiment shown in FIG. 2, the left and right support frames 14 and the mission case 4 are connected via the brackets 17. However, without using the brackets 17, the left and right support frames are supported. The frame 14 may be directly connected to the upper lateral surface of the mission case 4. In this case, the brackets 17 of the left and right support frames 14 are dedicated members for connecting and supporting the support brackets 10 for the top links 11. In the embodiment shown in FIG. 2, the brackets 17 of the left and right support frames 14 are separated from each other, but one bracket is used for the left and right support frames 14.
Alternatively, the one bracket may be connected to the upper rear portion of the mission case 4. The support frame 14 of the present invention not only supports the LOPS frame 12 but also supports only the roof 13 for the sunshade,
It can also be used for supporting the cabin.

The structure of the connecting portion between the upper ends of the left and right support frames 14 and the LOPS frame 12 is shown in FIG.
Instead of the structure (b), the structure may be configured as shown in FIG. 6 or 7. In the structure of FIG. 6, the supporting member 23 is not provided with the convex portion 23a as shown in FIG.
Is swingably supported around the horizontal axis P3 of the supporting portion 21, and by the spiral spring 25 having a toggle function,
The support member 23 is configured to be capable of being held in two postures, a standing posture shown by a solid line and a falling posture shown by a chain double-dashed line. As a result, the support member 23 is held in the standing posture shown by the solid line in FIG. 6, the upper end of the support member 23 is brought into contact with the upper convex portion 12b of the lops frame 12, and the lops frame 12 is moved as shown in FIG.
Fix in the posture shown by the solid line.

In the structure of FIG. 7, the supporting member 23 is not provided with the convex portion 23a as shown in FIG.
3 is swingably supported around the horizontal axis P3 of the supporting portion 21, and the supporting member 23 is biased counterclockwise in the drawing by the spiral spring 25. Thereby, the support member 23
7, the upper end of the support member 23 is brought into contact with the lower end portion of the LOPS frame 12, and the LOPS frame 12 is fixed in the posture shown by the solid line in FIG. In this case, when one rod 26 is erected and connected across the left and right support members 23 as shown in FIG. 7, the left and right support members 23 can be tilted and operated at once by holding the rod 26.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

1] Overall side view of an agricultural tractor

FIG. 2 is a rear view of the vicinity of the support frame of the agricultural tractor.

FIG. 3 is a side view of the vicinity of the support frame of the agricultural tractor.

FIG. 4 is an exploded perspective view showing a connecting structure between an upper end of a support frame and a lower end of a lops frame.

FIG. 5 is a vertical cross-sectional side view of a connecting portion between the upper end of the support frame and the lower end of the LOPS frame.

FIG. 6 is a vertical cross-sectional side view showing a first embodiment of the connecting structure of the upper end of the support frame and the lower end of the LOPS frame.

FIG. 7 is a vertical sectional side view showing a second alternative embodiment of the connecting structure of the upper end of the support frame and the lower end of the lops frame.

[Explanation of symbols]

 2 Rear wheel 3 Driving part 4 Mission case 5 Rear axle case 10 Support bracket 11 Top link 12, 13 Upper structure 14 Support frame 17 Bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Kawai, 250-2 Uehara-cho, Kawachinagano-shi, Osaka Prefecture, Ltd., Daido, Ltd. (72) Kazutaka Mizusawa, 250-2, Uehara-cho, Kawachinagano-shi, Osaka, Ltd. Inside Dydo

Claims (1)

[Claims] 1. A rear axle case (5) for a rear wheel (2) which projects left and right from a lower rear portion of a mission case (4).
And the lower ends of the pair of left and right support frames (14) for supporting the upper structures (12) and (13) of the driving section (3) are connected to each other, and the left and right support frames (14) are vertically intermediate. This part is connected to the upper rear part of the mission case (4), and the left and right support frames (1
A bracket (17) fixed to an intermediate portion in the vertical direction in 4) is connected to a support bracket (10) for a top link (11) fixed to a rear upper portion of the mission case (4). Tractor support frame connection structure.