JPH0655968U - Anti-rotation device for trailer connection - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the jackknife phenomenon with a simple structure. [Structure] Trailer 1 towed by tractor 3
This is a device for preventing rotation of the pin connecting portion with the tractor 3 when necessary, and a rotation preventing projection 11 is embedded in a required position on the rear upper surface of the tractor 3 so as to be tiltable. The cylinder device 13 is embedded at a required position on the rear upper surface of the tractor 3.
The rod end of the cylinder device 13 and the protrusion 11 are connected via a link 14. Normally, the tractor 3 is buried in a required position on the rear upper surface of the tractor 3, and when necessary, is erected by the cylinder device 13 to prevent rotation of the trailer 1 relative to the front end surface of the trailer 1 which is pin-connected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device capable of preventing rotation of a connecting portion of a vehicle that pulls a trailer by a tractor when necessary.

[0002]

[Prior art]

 In a vehicle in which a trailer is towed by a tractor, the tractor and the trailer are usually connected via a pin. That is, as shown in FIG. 4, a structure in which a pin 2 is projectingly provided on the lower surface of the front portion of the trailer 1 and the pin 2 is rotatably supported by a receiving portion 4 provided on the upper surface of the rear portion of the tractor 3 to be connected thereto. Therefore, as shown in FIG. 5, the tractor 3 and the trailer 1 can be bent around the pin 2 so that the turning radius can be made as small as possible.

However, in such a connecting portion via the pin 2, the tractor 3 is pushed forward by the inertial force of the trailer 1 when the vehicle is suddenly braked or the steering wheel is steeply operated at high speed. As a result, the pin 2 is bent and bent, so that the running becomes unstable, which is called a jack knife phenomenon.

Since the jack knife phenomenon causes an accident, various proposals have been made to prevent it, for example, Japanese Patent Laid-Open No. 49-100719 and Japanese Patent Publication No. 57-60962.

Among them, the one proposed in Japanese Patent Laid-Open No. 49-100719 has a structure in which the angle between the tractor and the trailer is variable by using two hydraulic cylinders, and these two hydraulic pressures are used during braking. It is intended to prevent the jack knife phenomenon by fixing the movement of the cylinder.

Further, the one proposed in Japanese Patent Publication No. 57-60962 discloses a gear piece fixed to a tractor and a trailer, and both end portions pivotally attached to each other around a central axis of the gear piece. By having a link having a portion and a pinion that is rotatably supported by the link about the central axis and meshes with the both gear pieces, by specifying the pitch circle radius of the gear piece in a predetermined range, They try to prevent the jackknife phenomenon.

[0007]

[Problems to be solved by the device]

 However, in the case of the former Japanese Patent Laid-Open No. 49-100719, the strength of the two hydraulic cylinders may be insufficient, especially when a large load is loaded on the trailer. is there. Further, the latter one proposed in Japanese Patent Publication No. 57-60962 has a drawback that it lacks certainty.

The present invention solves the problems of the conventional jackknife prevention mechanism, and provides a rotation preventing device for a trailer connecting portion which has a simple structure and can reliably prevent the jackknife phenomenon. Has an aim.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, an anti-rotation device for a trailer connecting portion of the present invention is a device for preventing a trailer towed by a tractor from rotating at a pin connecting portion with the tractor, when necessary. An anti-rotation projection that can be tilted or raised and lowered and a tilting or lifting mechanism for this projection are embedded in the required position on the upper surface, and if necessary, the projection is erected to face the front end surface of the trailer to which the pin is connected. It is configured to prevent the rotation of the.

[0010]

[Action]

 In the anti-rotation device for the trailer connecting portion of the present invention, when the hoisting or raising / lowering mechanism is operated during high-speed traveling, the anti-rotation projection rises or rises so as to face the front end face of the trailer, so that sudden braking is performed. In addition, even when the steering wheel is operated suddenly, the tractor is not pushed forward to be bent around the pin by the inertial force of the trailer due to the protrusion that is set up or raised.

[0011]

【Example】

 The present invention will be described below based on the embodiments shown in FIGS. 1 is a first embodiment showing the structure of a rotation preventing device for a trailer connecting portion of the present invention. (A) is a plan view, (b) is a sectional view taken along line bb of (a), and (c) is ( a) c-c cross-sectional view, FIG. 2 is a plan view for explaining the installation position of the rotation preventing device of the trailer connecting portion of the present invention, and FIG. 3 is an explanatory view of the second embodiment showing the configuration of the present invention device. is there.

In FIG. 1, reference numeral 11 is a rotation preventing projection embedded in a groove 3 a provided at a required position on the rear upper surface of the tractor 3, and has one end pivotally supported by a pin 12 and is raised about the pin 12. It is attached so that it can be tilted freely.

Numeral 13 is a cylinder device which is embedded in a groove 3a provided at a required position on the rear upper surface of the tractor 3 like the projection 11, and a cylinder end of the cylinder device 13 is pivotally supported in the groove 3a. On the other hand, a link 14 having the other end keyed to the pin 12 is pivotally attached to the rod end.

The first embodiment of the rotation preventing device for the trailer connecting portion of the present invention has the above-described structure, and the rotation preventing device having such a structure is erected by the cylinder device 13 as shown in FIG. 2, for example. The protrusions 11 formed are arranged so as to face the front end face of the trailer 1 which is pin-connected.

The second embodiment shown in FIG. 3 does not have the link 14 as in the first embodiment shown in FIG. 1, but the rotation preventing projection 11 is pivotally attached directly to the rod end of the cylinder device 13. Therefore, as shown in FIG. 1, the rotation preventing projection 11 is configured to move up and down without being tilted.

In the anti-rotation device of the trailer connecting portion of the present invention, when the vehicle travels at a high speed of, for example, 60 to 80 km / Hr or more, the cylinder device 13 is operated to retract the rod in the first embodiment of FIG. Further, in the second embodiment of FIG. 3, when the rod is moved out, the anti-rotation projection 11 rises or rises so as to face the front end surface of the trailer 1. Therefore, in such a state, even if sudden braking or sudden steering wheel operation is performed, the tractor 3 is bent around the pin 2 by the inertial force of the trailer 1 due to the protrusion 11 that is in the upright or raised state. It is not pushed forward as much as possible.

Further, when the vehicle is traveling at a relatively low speed less than the above-mentioned speed at which the jack knife phenomenon does not occur, the rod of the cylinder device 13 is moved out in the first embodiment of FIG. 1, and in the second embodiment of FIG. The projection 11 is buried in the groove 3a by retracting the rod. As a result, the same operation as the conventional one can be performed.

[0018]

[Effect of device]

 As described above, according to the rotation preventing device of the trailer connecting portion of the present invention, the jack knife phenomenon can be surely prevented by the device having an extremely simple structure.

[Brief description of drawings]

1 is a first embodiment showing the structure of a rotation preventing device of a trailer connecting portion of the present invention, (a) is a plan view, (b) is a sectional view taken along line bb of (a), and (c) is ( It is c-c sectional drawing of a).

FIG. 2 is a plan view illustrating an installation position of an anti-rotation device for a trailer connecting portion of the present invention.

FIG. 3 is an explanatory view of a second embodiment showing the configuration of the device of the present invention.

FIG. 4 is a front view for explaining a pin connecting portion of a trailer towed by a conventional tractor.

FIG. 5 is a plan view of FIG.

[Explanation of symbols]

 1 Trailer 2 Pin 3 Tractor 11 Anti-rotation protrusion 13 Cylinder device 14 Link

Claims (1)

[Scope of utility model registration request] 1. A device for preventing rotation of a trailer towed by a tractor at a pin connection portion with the tractor when necessary, and a rotation preventing projection that can be tilted up and down or moved up and down at a required position on a rear upper surface of the tractor. A trailer connecting portion is characterized in that a raising / lowering mechanism of the projection is embedded, and when the need arises, the projection is arranged to stand up so as to face the front end face of the trailer connected to the pin to prevent the trailer from rotating. Anti-rotation device.