CN215705502U - Connection structure to tractor - Google Patents

Abstract

The utility model provides a connecting structure for a tractor, which avoids interference with lower connecting rods arranged on left and right sides when a towed device is connected with a connecting part arranged at the center of the rear part of the tractor. When a long towed device (1) such as a carrying device is coupled to a coupling section (51) provided at the center of the rear part of a tractor (5), a trailing arm (3) provided upward from the coupling section (51) is attached to the coupling section (51) of the tractor (5) so as to be pivotable in the left-right direction, and a main arm (2) provided rearward from the trailing arm (3) is extended to form the trailing arm (3). Furthermore, a lower link (54) of the tractor (5) is driven to penetrate below the main arm (2) to prevent interference during turning.

Description

Connection structure to tractor

Technical Field

The present invention relates to a structure for coupling a towed device (hereinafter referred to as a "towed device") such as an agricultural implement to a tractor, and more particularly to a structure for coupling to a tractor, which can prevent interference with a lower link of the tractor.

Background

Generally, a tractor is connected to a towed device such as a conveying device for accommodating coarse fodder, and agricultural work is performed using the towed device (patent document 1 and the like).

However, when a relatively large towed device such as a conveying device for accommodating roughage is coupled to such a tractor, the towed device is coupled to a coupling portion provided at the center of the rear portion of the tractor, and the tire provided in the towed device can follow the tractor to perform work.

Prior art documents

Patent document 1: japanese patent laid-open publication No. 2013-111036

However, when the towed devices are connected and operated in this manner, the following problems occur.

Specifically, as shown in fig. 5, a coupling portion 51 provided at a central lower portion and lower links 54 provided at substantially the same height positions on both right and left sides of the coupling portion 51 are provided at the rear portion of the tractor, and when a large carrying device 1a or the like is coupled and the tractor is followed, the carrying device 1a is coupled to the coupling portion 51, and when a small fertilizer spreader (not shown) or the like is coupled and the fertilizer is spread in a string shape, the fertilizer spreader is coupled to the lower links 54 and the operation is performed in a state where the fertilizer spreader is lifted up. However, since the coupling unit 51 and the lower link 54 are provided at substantially the same height position (the state of fig. 6), when the conveying device 1a is coupled to the central coupling unit 51 and turned, the main arm 2a of the conveying device 1a interferes with the lower link 54 as shown in fig. 7. Therefore, in the prior art, when the conveying device 1a is coupled to the coupling portion 51, the lower link 54 is lifted up in advance to avoid interference with the main arm 2a, but in this case, there is a problem that not only is the operation of lowering the lower link 54 in advance troublesome, but also when the tractor moves from a steep slope to a flat ground, the lowered lower link 54 comes into contact with the ground.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above problems, and an object thereof is to provide a coupling structure to a tractor that avoids interference with a lower link provided on the left and right when coupling a towed device to a coupling portion provided at the center of the rear portion of the tractor.

In order to solve the above problem, the present invention provides a coupling structure to a tractor, in which a towed implement is coupled to a coupling portion provided at a rear center of the tractor, the coupling structure to the tractor including: a trailing arm attached to the connecting portion so as to be rotatable about a vertical axis and provided upward from the connecting portion; and a main arm provided above the trailing arm, extending rearward from the trailing arm, and connected to the towed device using the main arm.

With this configuration, since the trailing arm is provided so as to stand from the coupling portion, even when the towed device turns, the main arm of the towed device does not interfere with the lower link. In addition, it is not always necessary to lower the lower link in advance, and therefore the lower link does not contact the ground even in the case where the tractor moves from the slope of a steep slope to the flat ground.

In addition, in such a utility model, as the towed device, a towed device having a tire alone is used, and a towed device that follows a tractor and travels in a turnable manner is used.

When such a towed device is connected, the lower link does not interfere with the lower link, particularly when the tire of the towed device makes a turn with a small radius.

Further, a bearing member is detachably attached to the trailing arm, and a pin attached to the connecting portion is insertable into the bearing member.

With this configuration, the conventional bearing member is attached to the trailing arm, whereby the device to be towed can be coupled.

Further, the trailing arm is provided with an adjusting portion attached to adjust a height position of the bearing member.

With this configuration, the towed device can be connected with the front height position adjusted.

Further, the trailing arm is provided with an opening portion through which a hydraulic hose from the tractor passes.

With this configuration, even when the coupling position is high, the hydraulic hose of the tractor installed at a high position can be directly passed through the opening of the trailing arm, and the exposed hydraulic hose does not become an obstacle during cornering.

Effect of the utility model

According to the present invention, a tractor coupling structure for coupling a towed device to a coupling portion provided at the center of the rear portion of a tractor includes: a trailing arm attached to the connecting portion so as to be rotatable about a vertical axis and provided upward from the connecting portion; and a main arm provided above the trailing arm, extending rearward from the trailing arm, and connecting the towed device using the main arm, so that the main arm of the towed device does not interfere with the lower link even when the towed device is turning. Further, since it is not always necessary to lower the lower link in advance, the lower link does not contact the ground even in a case where the tractor moves from a steep slope to a flat ground.

Drawings

Fig. 1 is a diagram showing a state in which a tractor and a conveying device (towed device) are coupled to each other according to an embodiment of the present invention.

Fig. 2 is a view showing the vicinity of a coupling portion of the tractor according to this embodiment.

Fig. 3 is a front view showing the bearing member, the trailing arm, and the main arm in this embodiment.

Fig. 4 is a diagram showing a relationship between the lower link and the main arm at the time of turning in this mode.

Fig. 5 is a view showing a rear part of the tractor according to this embodiment.

Fig. 6 is a state diagram of a conventional example in which a tractor and a conveyance device are connected.

Fig. 7 is a diagram showing an interference state with the lower link at the time of turning in the conventional example.

Detailed Description

Hereinafter, a connection structure to the tractor 5 according to an embodiment of the present invention will be described with reference to the drawings.

As shown in fig. 5, the coupling structure to the tractor 5 according to the present embodiment is a coupling structure to the tractor 5 in which a vertically long towed device 1 is coupled to a tractor 5 having a coupling portion 51 at the rear portion, and the tractor 5 can be followed by tires of the towed device 1, and includes, as shown in fig. 1 to 3, a bearing member 4, a trailing arm 3, and a main arm 2, the bearing member 4 being rotatably attached to the coupling portion 51 provided at the rear portion of the tractor 5, the trailing arm 3 being provided in the vertical direction from the bearing member 4, the main arm 2 being provided in the substantially horizontal direction from the trailing arm 3, and the towed device 1 can be towed using the main arm 2. With this configuration, even when the vehicle turns with a small radius, the lower links 54 provided on the left and right sides of the coupling unit 51 are inserted below the main arm 2 as shown in fig. 4, thereby avoiding interference between the main arm 2 and the lower links 54. The connection structure in the present embodiment will be described in detail below.

First, as shown in fig. 1, the towed device 1 is configured to have a vertical shape of a unique tire, and is connected to be rotatable about a connection portion 51 (see fig. 5) of the tractor 5. As such a towed device 1, for example, a carrying device having a crate, a compost spreader, a baler, a packaging device for a bundle, and the like are exemplified, and a carrying device having a crate will be described here as an example.

A hollow main arm 2 extending toward the tractor 5 side is provided in front of the towed device 1. The main arm 2 is configured to be disposed in a substantially horizontal direction in the present embodiment, but may be configured in various shapes such as a configuration having a slightly inclined arm. The main arm 2 can be used to tow the base frame of the towed device 1. Here, when the main arm 2 is provided in the horizontal direction, the main arm 2 is attached to an upper portion of a trailing arm 3 described later, and therefore the position of the base frame becomes high with respect to the ground, and there is a possibility that the base frame becomes unstable. For this purpose, the main arm 2 may be connected to the base frame so that the base frame of the towed device 1 is positioned below the base frame, or the base frame may be installed at a high position in advance so that the center of gravity of a heavy object such as a cargo box of the towed device 1 is lowered.

A trailing arm 3 bent downward is provided at the tip of the main arm 2. The trailing arm 3 is provided so that the width in the front-rear direction is shorter than the length of the lower link 54 (preferably, in the range of 30% to 70% of the length of the lower link 54), and the upper portion of the trailing arm 3 is attached to the main arm 2 by welding. In this way, when the heavy towed device 1 is towed, a large moment can be applied to a bent portion between the trailing arm 3 and the main arm 2. The trailing arm 3 and the main arm 2 are welded here, but may be firmly attached using bolts and nuts, not shown, or the like. In this case, the trailing arm 3 and the main arm 2 may be fixed at least at two positions, front and rear, and up and down, so as to be able to receive a torque applied during towing.

As shown in fig. 3, an opening 32 communicating with the hollow portion of the main arm 2 is provided above the front surface (tractor 5 side surface) of the trailing arm 3. The opening 32 allows the hydraulic hose of the tractor 5 to pass therethrough, thereby preventing the hydraulic hose from being caught in the connection portion during turning.

On the other hand, a bearing member mounting portion 33 is provided at a lower portion of the trailing arm 3, and the bearing member mounting portion 33 is mounted with the bearing member 4 coupled to the coupling portion 51 of the tractor 5. The bearing member attachment portion 33 is attached by inserting a bolt and a nut through a hole provided in the side wall of the bearing member 4 and a hole provided in the side wall 31 of the trailing arm 3, and the height of the bearing member 4 is adjusted by using the adjustment portion 34. The adjusting portion 34 is provided with intermittent holes 41 along the vertical direction in the left and right side walls 31 in advance, and the bearing member 4 is mounted between the left and right side walls 31 and can be fixed by bolts and nuts. By adjusting the height position in this manner and attaching the apparatus, the towed apparatus 1 can be brought into a substantially horizontal state. If the towed device 1 can be brought into a substantially horizontal state in this way, the towed device 1 can be turned in a horizontal plane during turning, and an excessive load is not applied to the pin 53 attached to the connecting portion 51.

The bearing member 4 is coupled to a coupling portion 51 provided at the rear of the tractor 5, and a pin 53 is attached between the bearing member 4 and a hole 52 provided in the coupling portion 51 so as to be rotatable about the pin 53. When the device to be towed 1 is turned by the bearing member 4, the device to be towed 1 may swing in the vertical direction and turn, and therefore the hole 41 of the bearing member 4 is slightly larger than the pin 53.

Next, a process of connecting the towed device 1 configured as above to the connection portion 51 of the tractor 5 and an operation of towing after connection will be described.

First, when the towed device 1 is coupled to the tractor 5, the towed device 1 and the tractor 5 are brought close to each other, and the main arm 2 of the towed device 1 is lifted up.

Then, the height position of the bearing member 4 is set at a position where the towed device 1 is substantially horizontal, and the bearing member 4 is attached to the trailing arm 3.

In the state where the bearing member 4 is thus attached, the towed device 1 is further brought close to the tractor 5, and the pin 53 is inserted into the hole 41 of the bearing member 4 and the hole 52 of the coupling portion 51 of the tractor 5 and fixed so as not to fall off.

In the state where the towed device 1 is thus coupled by the pin 53, as shown in fig. 1, the lower link 54 of the tractor 5 is positioned below the main arm 2, and the bearing members 4 and the trailing arms 3 are only present on the base end portions of the left and right lower links 54.

Based on this situation, when performing work by towing the towed device 1, the main arm 2 is turned in the turning direction as shown in fig. 4 during turning, but at this time, the lower link 54 is provided so as to dig into the lower side of the main arm 2 (the broken line portion in fig. 4), and therefore the lower link 54 does not interfere with the main arm 2.

On the other hand, the bearing member 4 and the trailing arm 3 are provided near the connecting portion 51, but the trailing arm 3 is provided shorter than the right and left lower links 54, and therefore does not interfere with the lower links 54 except when turning at an extremely large angle.

As described above, according to the above embodiment, in the coupling structure to the tractor 5 that couples the towed device 1 to the coupling portion 51 provided at the center of the rear portion of the tractor 5, the trailing arm 3 and the main arm 2 are provided, the trailing arm 3 is attached to the coupling portion 51 so as to be rotatable in the left-right direction, the trailing arm is provided upward from the coupling portion 51, the main arm 2 is provided rearward from the trailing arm 3, and the towed device 1 is coupled using the main arm 2, so that the main arm 2 of the towed device 1 does not interfere with the lower link 54 even in the case where the towed device 1 makes a turn. Also, it is not always necessary to lower the lower link in advance, and therefore the lower link 54 does not contact the ground even in the case where the tractor moves from the steep slope to the flat ground.

The present invention is not limited to the above embodiments, and can be implemented in various forms.

For example, in the above-described embodiment, the trailing arm 3 and the bearing member 4 are described as separate members, but they may be used as an integrated member. The trailing arm 3 and the main arm 2 are also described separately, but they may be integrated. In this case, in the relation with the present invention, terms such as the trailing arm 3 and the main arm 2 can be understood as names of parts of the arms.

In the above embodiment, the trailing arm 3 is provided so as to face the vertical direction, but may be provided so as to be inclined or curved upward within a range not interfering with the lower link 54.

Further, although the main arm 2 is disposed substantially horizontally in the above embodiment, when the center of gravity of the towed device 1 is high, the main arm 2 may be inclined downward from the trailing arm 3 to tow the towed device 1 at a position not interfering with the lower link 54.

Description of the reference numerals

1 … towed device

2 … Main arm

3 … trailing arm

31 … side wall

32 … opening part

33 … bearing component mounting part

34 … adjustment part

4 … bearing component

41 … hole

5 … tractor

51 … joint part

52 … hole

53 … pin

54 … lower link.

Claims (5)

1. A coupling structure to a tractor, which couples a towed device to a coupling portion provided at the center of the rear portion of the tractor, is characterized by comprising:

a trailing arm pivotally attached to a vertical pin attached to the connecting portion and provided upward from the connecting portion; and

a main arm provided rearward from the trailing arm,

the main arm is used to connect the towed device.

2. The coupling structure to a tractor according to claim 1,

the towed device has tires on its own, and is driven by a tractor to travel in a manner enabling cornering.

3. The coupling structure to a tractor according to claim 1,

a bearing member is detachably attached to the trailing arm, and a pin attached to the connecting portion is insertable into the bearing member.

4. The coupling structure to a tractor according to claim 3,

the trailing arm is provided with an adjusting portion that is attached to adjust the height position of the bearing member.

5. The coupling structure to a tractor according to claim 1,

the trailing arm is provided with an opening through which a hydraulic hose from a tractor passes.

Images