JPH0419205A - Traction device for towing tractor - Google Patents

Abstract

PURPOSE:To prevent the slip-off of a draw bar pin during its upward thrust motion by moving a draw bar link along the slotted hole of a draw bar lever, and bringing the contact face of the draw bar link into strong contact with the contact face of a draw bar bracket. CONSTITUTION:When a draw bar pin 2 is thrusted up by a truck, a draw bar link 3 is also about to move upward in linkage with the upward motion of the draw bar pin 2. Since one end of the draw bar link 3 is connected to a draw bar lever 4 through a connecting pin 34 inserted through a slotted hole 40, the draw bar link 3 moves in the direction B along the slotted hole 40. As a result, the contact face 30 of the draw bar link 3 comes in contact with the contact face 10 of a draw bar bracket 1. The upward thrust force acting upon the draw bar pin 2 thereby escapes onto the base 11 side of the draw bar bracket 1 to stop the ascent of the draw bar pin 2. The draw bar pin 2 is therefore prevented from slipping out of the draw bar bracket 1.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a towing device for a towing tractor.

Specifically, when the cart is pushed up. The present invention relates to a technique for preventing drawbar pins from coming off.

[Prior art]

Generally, in a traction device for a towing tractor, a weight 901 formed on a vehicle body 90 is used as shown in FIG.
A drawbar bracket 91 is fixed to the rear lower end of the. Then, the drawbar bracket 91 is
A pin 92 is provided so as to be movable up and down. Although 2 illustrations are omitted,
The drawbar pin 92 connects the drawbar on the one-bogie side to pull one bogie.

The head of the drawbar pin 92 is connected to the drawbar link 9
3 to one end of the drawbar lever 94. A long hole 95 is provided at the connecting portion between the drawbar link 93 and the drawbar lever 94, thereby providing a certain amount of play. This is because the rotation loci of the drawbar link 93 and the drawbar lever 94 are different.

Further, as shown in the figure, a lever bracket 97 is fixed to the upper end of the weight 901, and the other end of the drawbar lever 94 is pivotally connected to the lever bracket 97. The drawbar lever 94 has an operating lever 96.
is attached, and the drawbar pin 92 is raised and lowered by the operation lever 96.

By the way, when a towing tractor suddenly stops or travels along a curve, the drawbar pin 92 is pushed up due to the inertial force of the truck. In order to prevent the drawbar pin 92 from coming off due to this pushing up, a deadline is generally provided. Regarding this, the 6th
This will be explained using FIG. 8 and FIG.

That is, first, as shown in FIG.
A is the pivot point between the drawbar lever 94 and the drawbar lever 94.

The pivot point between the drawbar pin 92 and the drawbar link 93 is B, and the drawbar link 93 and the drawbar lever 94 are
Let C be the pivot point with. At this time, the line connecting pivot point A and pivot point B is called Punto line D.

Next, as shown in Figure 6 (, pivot point C is at deadline D
If the drawbar pin 9 is located below the
When thrust force F is applied to 2.

The pivot point C attempts to move by a certain amount in the L direction (in the direction of the vehicle body 90). However, the drawbar lever 94 is attached to the vehicle body 90.
are in contact with each other, the force acting in the L direction is stopped by the vehicle body 90. the result.

The drawbar pin 92 stops pushing up.

Therefore, as shown in FIG. 8, when the long hole 95 is located below the deadline D.

The drawbar pin 92 is located at the pivot point C when there is upthrust.
rises until it reaches the upper end of the elongated hole 95. However, when the pivot point C reaches the upper end of the elongated hole 95, as explained in FIG. The thrusting stops.

In this way, in the conventional towing tractor, due to the deadline D, the drawbar pin 9 is pushed up.
We are trying to prevent the omission of 2.

[Problem to be solved]

However, in the conventional towing tractor traction device, in order to connect a bogie with a low drawbar height, the attachment of the drawbar bracket is difficult to install because the third problem occurs when the height or the length of the drawbar pin is changed. arise.

That is, as shown in FIG. 9, the drawbar bracket 91
If it is arranged at a low position, the upper end of the elongated hole 95 will protrude above the deadline D.

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

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

As a result, the drawbar lever 94 rotates about the pivot point A in the pulling direction. the result.

The drawbar pin 92 may come off, causing the bogie to separate from the towing tractor and cause the bogie to run out of control. In view of this conventional problem, the present invention provides a system in which the height of the drawbar bracket is changed. It is possible to reliably prevent the drawbar pin from coming off due to pushing up. The purpose of the present invention is to provide a traction device for a towing tractor with excellent reliability.

[Means for Solving the Problems] The present invention provides a drawbar pin that is movable up and down with respect to a drawbar bracket fixed to a vehicle body.5 The head of the drawbar pin is connected to a drawbar lever via a drawbar link, and the drawbar - In a traction device for a towing tractor, the lever is pivotally connected to a lever bracket fixed to the vehicle body and rotated by an operating lever,
The towing tractor towing device is characterized in that the drawbar bracket and the drawbar link are provided with contact surfaces that face each other when the drawbar pin is lowered.

What is most noteworthy about the present invention is that the drawbar bracket and the drawbar link have abutment surfaces that face each other when the drawbar pin is in a stationary state with the dropper pin lowered. - The structure is such that the contact surface of the bracket and the contact surface of the drawbar link are brought into contact with each other.

When the contact surfaces of the drawbar bracket and the drawbar link face each other in a vertical plane (first embodiment, second embodiment),
Example), when facing each other on a horizontal plane (third example)
etc. Further, it is also possible to provide a notch in the contact surface of the drawbar link (second embodiment).

The above means is particularly effective when the deadline cannot be effectively formed due to a change in the mounting position of the drawbar bracket.

[For production]

In the present invention, when the drawbar pin is pushed up by the truck, the drawbar link moves along the long hole of the drawbar lever. and.

At this time, the abutment surface of the drawbar link and the abutment surface of the drawbar link strongly abut. The thrusting force acting on the tametrobar pin escapes directly to the drawhar racket via the drawbar link. This stops the drawbar pin from rising.

Therefore, the drawbar pin will not come out of the drawbar bracket.

〔effect〕

Therefore, according to the second aspect of the present invention, with the simple structure as described above, it is possible to reliably prevent the drawbar pin from coming off during pushing up. It is possible to provide a traction device for a towing tractor with excellent reliability.

〔Example〕

First Embodiment A towing tractor traction device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. In the traction device of this example, the contact surfaces 10 and 30 of the draw bar bracket 1 and the draw bar link 3 are made to face each other in a vertical plane.

In this example device, first, the drawbar pin 2 is attached to the drawbar bracket 1 fixed to the weight 901 of the vehicle body 90.
be arranged so that it can be raised and lowered. The head of the drawbar pin 2 is connected to a drawbar lever 4 via a drawbar link 3. The drawbar lever 4 is pivotally connected to the lever bracket 97 fixed to the weight 901 and rotated by the operating lever 96.

The drawbar bracket 1 and the drawbar link 3 face each other when the drawbar pin 2 is lowered. A contact surface 10.30 is provided.

The drawbar bracket 1 is as shown in Fig. 1.
It consists of a board 11 fixed to the rear lower end of the weight 901 and three bracket pieces 12 extending horizontally from the board 11 in upper, middle, and lower stages. Each bracket piece 12 has a pin insertion hole (not shown). (omitted). The drawbar pin 2 is inserted into the pin insertion hole so as to be movable up and down. Further, on the vertical surface of the substrate 11, a contact surface 10 is formed which faces a contact surface 30, which will be described later, when the drawbar pin 2 is lowered.

As shown in FIGS. 2 and 3, the drawbar link 3 is composed of a pair of left and right link pieces 31 formed in a substantially triangular shape, and the three link pieces 31 are integrally formed by connecting pins 23 and 34. The pin bracket 20 protruding from the head of the drawbar pin 2 and the drawbar link 3 are connected by the connection pin 23. Further, the drawbar link 3 has a contact surface 30 that faces the contact surface 10 of the drawbar bracket 1 when the drawbar pin 2 is lowered.

The drawbar lever 4 is formed into a long plate shape.

One end thereof has a long hole 40 that opens along the center line. Then, the drawbar link 3 and the drawbar lever 4 are connected by the connecting pin 34 inserted through the elongated hole 40. Further, a stopper 5 fixed to the base plate 11 of the drawbar bracket 1 is located below the drawbar lever 4.
It is provided so that it can come into contact with. The stopper 5 is
(When the drawbar lever 4 is in contact with the drawbar bracket 1 and the drawbar link 3,
The cast members are placed so as to form a certain gap S between them.

On the other hand, the other end of the drawbar lever 4 is connected to a connecting pin 49.
It is pivotally connected to the lever bracket 97 shown in the conventional example. Further, the base of the operating lever 96 shown in the prior art example is fixed to the drawbar lever 4.

Since the device of this example is configured as described above, it exhibits the following effects.

When the drawbar pin 2 is pushed up by the truck, the drawbar link 3 also tends to rise due to the rise of the drawbar pin 2. In this case, one end of the drawbar link 3 is connected to the drawbar lever 4 via the connecting pin 34 inserted through the elongated hole 40, so as shown in FIG. 40 in direction B.

As a result, the contact surface 30 of the drawbar link 3 contacts the contact surface 10 of the drawbar bracket 1.

As a result, the pushing up force acting on the drawbar pin 2 escapes to the board 11 side of the drawbar bracket 1. Therefore, the drawbar pin 2 stops rising.

Therefore, the drawbar pin 2 will not come off from the drawbar bracket 1 due to pushing up.

On the other hand, rotate the operating lever 96 to remove the drawbar pin 2.
When pulling up the drawbar link 3, as shown in FIG. 2, the drawbar link 3 smoothly rotates along the E line using the connecting pin 23 as a fulcrum.

This is drawbar bracket 1 and drawbar link 3
This is because a gap S is provided between the two.

As shown in FIG. 2, the E line is the locus of the contact surface 30 formed on the drawbar link 3,
The rotation trajectory with the maximum radius centered on .

As described above, according to this example, the drawhar racket 1 is attached at the time of pushing up even if the position is changed. It is possible to reliably prevent the drawbar pin 2 from coming off.

Second Embodiment A traction device for a towing tractor according to this embodiment will be explained with reference to FIG.

That is, the drawbar link 6 is used in place of the drawbar link 3 of the first embodiment. The drawbar link 6 is
As shown in FIG. 4, as in the first embodiment, it is formed into a substantially triangular shape, and an abutting surface 60 is formed on the negative side. Further, the drawbar link 6 has a shape in which a portion corresponding to a foot F of a perpendicular line dropped from the connecting pin 23 to the contact surface 60 is cut out. This is because when the drawbar link 6 is rotated about the connecting pin 23 as a fulcrum, the portion of this perpendicular line corresponding to the foot F has the greatest influence on the E line.

In addition, the stomper 5 shown in the first embodiment is abolished,
With the drawbar pin 2 lowered, the drawbar
The abutment surface 10 of the bracket 1 and the abutment surface 60 of the drawbar link 6 are arranged so as to be in contact with each other.

The device of this example is configured as described above.

It exhibits the following effects.

That is, as in the first embodiment, when the drawbar pin 2 is pushed up, the contact surface 10 of the drawbar bracket 1 and the contact surface 60 of the drawbar link 6 strongly contact each other, so that the drawbar pin 2 is pushed up. Regulate the rise of 2. Therefore, the drawbar pin 2 will not come off from the drawbar bracket 1.

Furthermore, in this example, since the lower surface side of the drawbar link 6 has a cutout corresponding to the E line, even when the drawbar bracket 1 and the drawbar link 6 are in contact with each other, the drawbar link 6 is notched. The link 6 can be smoothly rotated in the pulling direction using the connecting pin 23 as a fulcrum.

Third Embodiment The traction device of this example, which will be explained with reference to FIG. be.

That is, in the second embodiment, the drawbar bracket 1 shown in the first embodiment has a protrusion 111 projecting horizontally from the upper end of the base plate 11 thereof. A contact surface 10 that can face a contact surface 70 of a drawbar link 7, which will be described later, is formed on the lower surface of the protrusion 111.

Further, a drawbar link 7 is used in place of the drawbar link 3 in the first embodiment. The drawbar link 7 is formed into a substantially triangular shape like the drawbar link 3, as shown in FIG.

A notch 71 is formed on the negative side to correspond to the protrusion 111 of the substrate 11. The bottom surface of the notch 71 is formed with a contact surface 70 that faces the contact surface 10 of the drawbar bracket 1 when the drawbar pin 2 is lowered.

The drawbar bracket 1 and the drawbar link 7 are 5.
The contact surfaces 10 and 70 are arranged so as to form a constant gap S between them. As shown in FIG. 5, this gap S is large enough to prevent the protrusion 111 of the drawbar bracket 1 from interfering with the E line when the drawbar link 7 is rotated along the E line. Further, as shown in FIG. 5, the overall length of the drawbar pin 2 in this example is such that the length l from the lower bracket piece 12 of the drawbar bracket 1 to the tip of the drawbar pin 2 is larger than the gap S. Form it so that it becomes.

The rest is the same as the first embodiment.

Since the device of this example is configured as described above, it exhibits the following effects.

That is, when the drawbar pin 2 is pushed up by the cart, the drawbar link 7 does not rise, but moves in the direction B along the long hole 40, as shown in FIG. As a result, the contact surface 70 of the draw bar link 7 and the contact surface 10 of the draw bar bracket 1 come into contact with each other. This is similar to the first embodiment.

It is possible to prevent the drawbar pin 23 from coming off.

In this case, as shown in FIG. 5, the drawbar pin 2 is
The length at the tip! Because it has 1 contact surface of 10.70
Due to this contact, the drawbar pin 2 will not come off.

Furthermore, in this example, since the two contact surfaces 10.70 face each other in the vertical direction, this is particularly effective against an impactful uplift force that occurs when a towing tractor climbs over a step.

When the drawbar link 7 is rotated in the pulling direction using the connecting pin 23 as a fulcrum, the gap S allows the drawbar link 7 to rotate without coming into contact with the protrusion 111 of the drawbar bracket 1.

[Brief explanation of the drawing]

1 to 3 show a traction device for a towing tractor according to a first embodiment, FIG. 1 is a side view thereof, FIG. 2 is a side view of its main parts, and FIG. 3 is a rear view of its main parts. Figure 4 is the second
FIG. 5 is a side view of the main parts of the towing tractor traction device according to the third embodiment; FIGS. 6 and 7 are explanatory diagrams of the action of the deadline. FIG. 8 is a side view of a traction device in a conventional towing tractor. FIG. 9 is a similar side view of the conventional towing device when the mounting position of the drawhaar bracket has been changed. 190. drawbar bracket. 10. Contact surface. 230. drawbar pin. 36.7. ,, Drawbar link 30.60 70. ,, contact surface. 431. Drawbar lever 591. Stopper 96, . . . Operation lever 97, . . . Lever bracket S11. gap.

Claims (1)

[Claims] A drawbar pin is provided to be movable up and down relative to a drawbar bracket fixed to the vehicle body, the head of the drawbar pin is connected to a drawbar lever via a drawbar link, and the drawbar lever is connected to a lever fixed to the vehicle body. In a towing tractor traction device which is pivotally attached to a bracket and rotated by an operating lever, the drawbar bracket and drawbar link have the following features:
A towing device for a towing tractor, characterized in that a drawbar pin is provided with contact surfaces that face each other when the drawbar pin is lowered.