JPH08205607A - Tractor - Google Patents

Abstract

PURPOSE: To provide a tractor having increased supporting strength of a top link bracket and enabling easy assembling of the parts by mutually connecting the upper end of a lower link bracket to the lower end of a top link bracket through a lateral frame for the attachment of a supporting frame. CONSTITUTION: A lower link bracket 12, a top link bracket 13 and a pair of right and left supporting frames 11, 11 to attach an upper structure for covering the top of a driver's seat are provided at the rear part of a transmission case of a tractor. The upper end of the lower link bracket 12 connected to the back of the transmission case and the lower end of the top link bracket 13 are connected with each other through a lateral frame 14 for attaching the supporting frames 11.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to tractors.

[0002]

2. Description of the Related Art A conventional tractor is an actual Kaihei 1-1388.
As disclosed in Japanese Patent Publication No. 47, the rear part of the mission case is provided with a mounting bracket for the three-point link mechanism and a support frame for an upper structure that covers the upper part of the driving section, and for the lower link of the three-point link mechanism. The lower link bracket is connected to the rear side surface of the mission case, and the top link bracket for the top link of the three-point link mechanism is a cylinder block at the top of the mission case, that is, a drive cylinder for the lift arm provided at the top of the mission case. It is connected to the back of the internal cylinder block.

[0003]

When the working device is raised to the ground via the three-point link mechanism, the working device tries to rotate by using the connection point of the working device to the lower link as a fulcrum. The pulling force acts. When the bending angle of the top link with respect to the top link bracket increases as the ground rises, the component force in the vertical direction of the top link increases, and an upward turning moment acts on the top link bracket.

Therefore, a three-point link mechanism using a short top link, that is, a three-point link mechanism in which the swing angle of the top link is larger than the swing angle of the lower link as the lift arm rises is used. Then, although the working device can be largely lifted as the working device rises above ground, in order to raise the working device greatly, the shorter the length of the top link is, in other words, the length of the top link bracket. As the length becomes longer, the length of the arm of the top link bracket as the moment arm becomes longer, and it becomes necessary to increase the coupling strength on the rear surface of the cylinder block by acting on the rear surface of the cylinder block with a large rotational momentum.

However, since the top link bracket has a structure that can be compactly mounted on the rear surface of the cylinder block above the transmission case, it is not possible to increase the mounting area on the rear surface of the cylinder block. There is an inconvenience that the connecting strength of the rear surface of the cylinder block decreases as the value of is used.

It is an object of the present invention to enhance the strength of connection of the top link bracket to the cylinder block, paying attention to the fact that a support frame for the upper structure of the driving section is provided at the rear of the mission case. .

[0007]

The characteristic structure of the present invention for attaining the above object is to provide a left and a right for mounting an upper structure which covers a lower link bracket and a top link bracket, and an upper part of a driving part at a rear portion of a mission case. In a tractor including a pair of support frames, upper ends of lower link brackets and lower ends of top link brackets connected to a rear portion of the mission case are connected to each other via a horizontal frame for mounting the support frames.

[0008]

[Function] The upper turning moment applied to the top link bracket can be shared and supported by the rear surface of the cylinder block and the upper surface of the horizontal frame for mounting the support frame, thereby increasing the support strength of the top link bracket. You can Moreover, since the lateral frame for mounting the support frame is a strength member which is formed to have a large strength in advance in order to mount the pair of left and right support frames for mounting the upper structure, the rotation moment of the bracket for mounting the top link is The supporting strength for is further increased. Further, by using a horizontal frame having a length in the longitudinal direction of the machine body corresponding to the length of the top link bracket, the supporting strength can be increased without increasing the mounting area on the rear surface of the cylinder block. .

[0009]

As described above, since the top link bracket is supported via the horizontal frame for mounting the support frame provided on the rear surface of the cylinder block and the upper surface of the lower link bracket, the top link bracket is attached to the rear surface of the cylinder block. The top link bracket can be firmly supported while avoiding stress concentration.

Further, if the length of the horizontal frame in the longitudinal direction of the machine body is made to correspond to the length of the top link bracket, the supporting strength can be increased without increasing the mounting area on the rear surface of the cylinder block. it can.

Since the lower link bracket, the top link bracket, and the lateral frame for mounting the support frame have a three-piece integrated structure, they can be easily assembled to the mission case.

[0012]

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 on the rear side 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. A cylinder block 6 which pivotally supports a pair of left and right lift arms 5 so as to be vertically swingable is connected to an upper surface of the mission case 4, and a pair of left and right lower links 7 are vertically swung below a rear portion of the mission case 4. The pair of left and right lift arms 5 and the lower link 7 are movably supported and are connected by a linking rod 8. A single top link 9 is swingably supported above the rear part of the mission case 4, and the single top link 9 and the pair of left and right lower links 7 constitute a three-point link mechanism. Various working devices (not shown) such as a rotary tiller are connected to the three-point link mechanism, and the lift arm 5 is used to
The working device is moved up and down via the point link mechanism. This agricultural tractor is provided with a gate-shaped lops frame 10 for overturn protection as an upper structure above the operation unit 3. The lower ends of a pair of left and right support frames 11 that support the lower part of the ROPS frame 10 are attached to a bracket mechanism mounting bracket unit A that is connected to the rear portion of the mission case 4.

Next, the bracket unit A will be described. As shown in FIGS. 2 to 4, the bracket unit A includes a pair of left and right lower link brackets 12 connected to the rear side surface of the mission case 4 and a mission case. 4 a pair of left and right top link brackets 13 connected to the back surface of the upper cylinder block 6, and a pair of left and right support frames 11 for connecting the lower link bracket 12 and the top link bracket 13 to each other It is configured.

The horizontal frame 14 for mounting the support frame 11 is composed of an angle plate that is strong against bending, and the top link bracket 13 is used for the cylinder block 6.
A plate 13a that can be bolted to the back surface of the plate and a pair of left and right plates 13b that are welded and fixed to the back surface of the plate, and the horizontal frame 14 is erected and connected across the upper surfaces of the left and right lower link brackets 12. The lower end of the top link bracket 13 is welded to the upper surface of the horizontal frame 14. Angle plates 12c for connecting to the rear surface of the mission case 4 are fixedly connected to the inner surfaces of the pair of left and right lower link brackets 12, and a bolt hole 12a for connecting to the side surface of the mission case 4 and a lower portion are connected to these plates. Link 12
Is provided with a fulcrum shaft 12b and a bolt hole 12d for connecting to the rear face of the mission case 4, and
The top link bracket 13 is formed with a bolt hole 13c for connecting to the rear surface of the cylinder block 6 and a pin hole 13d for attaching the top link 9. The horizontal frame 14 for mounting the support frame 11 is provided with a bolt hole 14a for connecting the support frame.

The support frame 11 also serves as a mounting frame for the rear wheel fender 15, and the lower end of the support frame 11 is between the lower surface of the support frame 11 and the upper surface of the lateral frame 14. The elastic frame 16 is bolted to the lateral frame 14 with the elastic rubber 16 interposed therebetween, and the upper end of the support frame 11 is integrally bolted to the rear wheel fender 15 and the lops frame 10.

[Other Embodiments] In the above-mentioned embodiment, as the upper structure, the LOPS frame for tipping protection is attached, but it may be a cabin or an awning.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

FIG. 1 is a schematic side view of the entire tractor.

FIG. 2 Rear view of the tractor

FIG. 3 is a partially cutaway rear view of the tractor.

FIG. 4 is a perspective view of a bracket unit.

[Explanation of symbols]

 4 Mission case 11 Support frame 12 Lower link bracket 13 Top link bracket 14 Horizontal frame

Claims (1)

[Claims] 1. A pair of left and right support frames (11) for mounting an upper structure, which covers a lower link bracket (12) and a top link bracket (13) and an upper portion of a driving part, at a rear portion of a mission case (4). In the tractor including 11), the upper end of the lower link bracket (12) and the lower end of the top link bracket (13) connected to the rear part of the mission case (4) are attached to the lateral frame for mounting the support frame (11). A tractor interconnected via (14).