JP2546406B2 - Towing tractor traction device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a towing device for a towing tractor, and more specifically to a technique for effectively operating a deadline of the towing device.

[Prior art]

Generally, in the towing tractor traction device,
As shown in FIG. 7, a drawbar bracket 91 is fixed to the lower end of the rear part of the vehicle body 90. And the drawbar bracket
A drawbar pin 92 is provided so that it can be raised and lowered with respect to 91. Although not shown, the drawbar pin 92 connects the drawbar on the truck side and pulls the truck.

The drawbar pin 92 has a drawbar link 93
Is connected to one end of the drawbar lever 94 via the. A long hole 95 is provided in a connecting portion between the drawbar link 93 and the drawbar lever 94, so that a certain amount of play is provided. This is because the rotation trajectories of the drawbar link 93 and the drawbar lever 94 are different.

Also, as shown in the drawing, at the rear upper end of the vehicle body 90,
A lever bracket 97 is fixed, and the other end of the drawbar lever 94 is pivotally attached to the lever bracket 97. And
An operation lever 96 is attached to the drawbar lever 94, and the drawbar pin 92 is moved up and down by the operation lever 96.

By the way, in the case of a sudden stop or running along a curve in the towing tractor, the drawbar pin 92 is pushed up by the inertial force of the bogie. A dead line is provided in order to prevent the drawbar pin 92 from coming off due to this pushing up. This will be described with reference to FIGS. 5 and 7.

That is, first, as shown in FIG. 7, the lever bracket 97
A and the drawbar pin 92
The pivot point between the drawbar link 93 and the drawbar link 93 is B, and the pivot point between the drawbar link 93 and the drawbar lever 94 is C. At this time, the line connecting the pivot point A and the pivot point B is a deadline D.
Call.

Next, as shown in FIG. 5, when the pivot point C is located below the deadline D, when the push-up force F acts on the drawbar pin 92, the pivot point C moves in the L direction (vehicle body). Try to move a certain amount in 90 directions). However, since the drawbar lever 94 is in contact with the vehicle body 90, L
The force acting in the direction is received by the vehicle body 90. As a result, the push-up of the drawbar pin 92 is stopped.

Therefore, as shown in FIG. 7, when the elongated hole 95 is located below the deadline D, the drawbar pin 92 has its pivot point C at the upper end of the elongated hole 95 when the drawbar pin 92 is pushed up. Rises until it reaches. However, when the pivot point C reaches the upper end of the long hole 95, the pivot point C tries to move in the direction of the vehicle body 90 by a certain amount as described with reference to FIG. Thrust stops.

Thus, in the conventional towing tractor,
Drawbar pin by pushing up due to deadline D
I am trying to prevent the 92 from coming off.

[Problems to be solved]

However, in the conventional towing device for a towing tractor, if the mounting height of the drawbar bracket or the length of the drawbar pin is changed in order to connect a truck with a low drawbar height, the following problems occur.

That is, as shown in FIG. 8, the drawbar bracket 91
When arranging at a lower position, the upper end portion of the elongated hole 95 comes out above the dead line D.

Therefore, when the drawbar pin 92 is pushed up by the carriage, the pivot point C rises to above the deadline D.

In this case, as shown in FIG. 6, when the push-up force F acts on the drawbar pin 92, the pivot point C moves in the U direction (the pulling-up direction of the drawbar pin 92).

As a result, the drawbar lever 94 rotates in the pulling direction about the pivot point A. As a result, the drawbar pin 92 may come off, the truck may separate from the towing tractor, and the truck may run out of control.

In view of such conventional problems, the present invention intends to provide a towing device for a towing tractor that can effectively function the deadline even when the height of the drawbar bracket is changed. is there.

[Means for solving problems]

According to the present invention, a drawbar pin is provided to be movable up and down with respect to a drawbar bracket fixed to a vehicle body, the head of the drawbar pin is connected to a drawbar lever via a drawbar link, and the drawbar lever is attached to a lever bracket fixed to the vehicle body. In a towing device for a towing tractor that is pivotally attached and is rotated by an operating lever, the drawbar lever is pivotally attached between the drawbar lever and the drawbar link when the drawbar pin is pushed up by a carriage, and C is the above-mentioned. A stopper is provided for restricting rising beyond a deadline D connecting a pivot point A for rotating the drawbar lever and the operation lever integrally and a pivot line B for connecting the drawbar link and the drawbar pin. It is a characteristic towing device for towing tractors.

What is most noticeable in the present invention is that the drawbar lever is provided with a stopper so that the pivot point C does not exceed the deadline D in order to effectively function the deadline D.

The stopper may be provided above the dead line D (see FIG. 1) or below the dead line D (see FIG. 3) in the drawbar lever.

[Work]

In the present invention, when the drawbar pin is pushed up by the dolly, the stopper restricts the rise of the pivot point (pivot point C) between the drawbar lever and the drawbar link. Therefore, the pivot point C does not rise beyond the deadline D.

Therefore, as mentioned above, the pivot point C
Moves toward the vehicle body to prevent the drawbar pin from rising (Fig. 5).

[Effect]

Therefore, according to the present invention, the deadline can always function effectively regardless of the attachment position of the drawbar bracket or the like. Accordingly, it is possible to provide a towing device for a towing tractor, which can prevent the drawbar pin from coming off during thrusting.

〔Example〕

First Embodiment Regarding the towing device of the towing tractor according to the present embodiment,
This will be described with reference to FIGS. 1 and 2. In the traction device of this example, a stopper 6 is arranged above the deadline D.

In the apparatus of this example, first, the drawbar pin 2 is arranged so as to be able to move up and down with respect to the drawbar bracket 1 fixed to the vehicle body 90. The head of the drawbar pin 2 has a drawbar link 3
Is connected to the drawbar lever 4 via. The drawbar lever 4 is pivotally attached to the lever bracket 5 fixed to the vehicle body 90 and is rotated by the operating lever 96.

The drawbar lever 4 has a deadline D at the pivot point C between the drawbar lever 4 and the drawbar link 3 when the drawbar pin 2 is pushed up by the carriage.
A stopper 6 is provided for restricting the rise above the limit.

As shown in FIGS. 1 and 2, the drawbar bracket 1 is composed of a board 11 fixed to a lower end of a rear portion of a vehicle body 90, and a pair of upper and lower bracket pieces 12 extending horizontally from the board 11. A pin insertion hole (not shown) is formed in both bracket pieces 12. The drawbar pin 2 is inserted into the pin insertion hole so as to be able to move up and down.

As shown in FIGS. 1 and 2, the drawbar link 3 is composed of a pair of link pieces 30 formed in a substantially triangular shape, and both link pieces 30 are integrally formed by connecting pins 23 and 34. The connecting pin 23 connects the pin bracket 20 projecting from the head of the drawbar pin 2 to the drawbar link 3.

The drawbar lever 4 is formed in a long plate shape and one end thereof is bent, and a long hole 40 is opened in the bent portion along the vertical direction. Then, the connecting pin 34 is movably inserted into the elongated hole 40. That is, the connecting pin 34
The drawbar link 3 and the drawbar lever 4 are connected by. Further, one end of the drawbar lever 4 is provided so as to be capable of contacting the base plate 11 of the drawbar bracket 1.

On the other hand, the other end of the drawbar lever 4 is pivotally attached to the lever bracket 5 by a connecting pin 45. Further, the base portion of the operation lever 96 is fixed to the draw bar 4.

Therefore, the connecting pins 45, 23, 34 correspond to the pivot points A, B, C, respectively, and the dead line D can be formed by connecting the connecting pins 45, 23. As shown in FIG. 1, in the case of this example, one end of the long hole 40 is protruded upward from the dead line D.

As shown in FIGS. 1 and 2, the stopper 6 is arranged along the drawbar lever 4 on the upper side of the deadline D, and the abutting portion 60 formed at one end thereof is the upper end portion of the drawbar link 3. It is provided so that it can abut. That is, the contact portion 60 of the stopper 6 prevents the drawbar link 3 from rising above the deadline D.
Although not shown, the stopper 6 is the drawbar lever 4
It is fixed with bolts.

Since the device of this example is configured as described above, the following operational effects are exhibited.

When the drawbar pin 2 is pushed up by the bogie,
As the drawbar pin 2 rises, the drawbar link 3 also rises. The drawbar link 3 lifted in this manner eventually contacts the contact portion 6 of the stopper 6,
That rise is stopped. This restricts the pivot point C from rising beyond the deadline D.

In this way, since the pivot point C does not exceed the deadline D, as shown in FIG. 5, the push-up force F exerted on the drawbar pin 2 causes the pivot point C to move in the direction of the vehicle body 90 (in FIG. 5). (L direction). As a result, the lower end of the drawbar lever 4 contacts the substrate 11. Then, the push-up force F applied to the drawbar pin 2 escapes to the substrate 11 side, so that the rise of the drawbar pin 2 is stopped.

Therefore, the drawbar pin 2 does not come off by pushing up.

Therefore, according to this example, it is possible to obtain the towing device of the towing tractor, which can effectively function the deadline D at the time of pushing up and prevent the drawbar pin 2 from coming off.

Second Embodiment A towing tractor traction device according to the present embodiment will be described.
This will be described with reference to FIGS. 3 and 4. In the traction device of this example, a stopper 8 is arranged below the deadline D.

That is, instead of the stopper 6, the stopper 8 is used. As shown in FIGS. 3 and 4, the stopper 8 is formed in a cylindrical shape and is fixed to the draw bar lever 4 below the dead line D. The stopper 8
Is arranged so that when the drawbar pin 2 is pushed up by the carriage, it comes into contact with a drawbar link 7 which will be described later and restricts the pivot point C from rising beyond the deadline D.

A drawbar link 7 is used instead of the drawbar link 3 of the first embodiment. Similar to the drawbar link 3, the drawbar link 7 is composed of a pair of link pieces 70 formed in a substantially triangular shape. The drawbar link 7 is provided so that one end thereof faces the stopper 8. Then, it is connected to the pin bracket 20 by a connecting pin 27 (pivot point B). Further, it is connected to the draw bar lever 4 by a connecting pin 47 (pivot point C).

Since the device of this example is configured as described above, the following operational effects are exhibited.

That is, similar to the first embodiment, even if the drawbar pin 2 is pushed up, the drawbar link 7 and the stopper 8 are
Thus, the rise of the pivot point C is restricted. Therefore, the pivot point C does not rise beyond the deadline D.

Further, in this example, since the stopper 8 is located below the dead line D, the regulation of the rise of the pivot point C by the dead line D can be more reliably functioned. In particular, it is effective against the shocking thrust force generated when the towing tractor gets over the step.

Therefore, according to this example, it is possible to obtain the towing device of the towing tractor, which can make the deadline D function more effectively at the time of pushing up.

[Brief description of drawings]

1 and 2 show a towing device for a towing tractor according to the first embodiment. FIG. 1 is a side view thereof, FIG. 2 is a front view thereof, and FIGS. 3 and 4 are second embodiments. FIG. 3 shows a towing device for a towing tractor according to the present invention. FIG. 3 is a side view thereof, FIG. 4 is a front view thereof, and FIGS. 5 and 6 are pivot points C.
And FIG. 7 is a side view of the traction device in the conventional towing tractor, and FIG. 8 is a similar side view of the conventional case where the attachment position of the drawbar bracket is changed. 1 …… Drawbar bracket, 2 …… Drawbar pin, 3,7 …… Drawbar link, 4 …… Drawbar lever, 5 …… Lever bracket, 6,8 …… Stopper, 96 …… Operating lever, A, B, C …… Pivot point, D …… Deadline,

Claims (1)

(57) [Claims] 1. A drawbar pin is provided to be movable up and down with respect to a drawbar bracket fixed to a vehicle body, the head of the drawbar pin is connected to a drawbar lever via a drawbar link, and the drawbar lever is fixed to the vehicle body. In the towing device of the towing tractor, which is pivotally attached to the drawbar lever and is pivoted by the operation lever, the drawbar lever has a pivot point C between the drawbar lever and the drawbar link when the drawbar pin is pushed up by the carriage. A stopper is provided for restricting upward movement beyond a deadline D connecting a pivot point A for rotating the drawbar lever and the operating lever integrally and a pivot point B for connecting the drawbar link and the drawbar pin. Towing tractor pulling device.