JPH04123789U - Semi-trailer anti-jack knife device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an anti-jackknife device for a semi-trailer that increases the running stability and safety of a semi-trailer by providing appropriate rotational resistance against changes in coupling angle as necessary when traveling. do. [Configuration] A vertical resistance pin 1 that is installed slightly in front of the king pin 02 of the trailer 01 and can be moved in and out by remote control via an actuator, and a tractor 0
An arcuate recessed groove whose center is a kingpin fitting hole formed by a jaw that is recessed in the coupler 04 of No. 3 and which grips the kingpin 02, and whose radius is the distance between the kingpin 02 and the resistance pin 1, It has a groove width into which the lower end of the resistance pin is inserted, and a central deep groove part with a constant depth formed in the center part, and a shallow end part formed continuously at the left and right ends of the groove part where the depth of the groove bottom gradually decreases. It is provided with an arcuate resistance groove 6 consisting of a groove part.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an anti-jackknife device for semitrailer.

0002

[Conventional technology]

As shown in the side view of Fig. 5 and the plan view of Fig. 6, the semi-trailer has a tray. The tractor 01 is connected to the tractor 03 via a king pin 02 protruding from the lower surface of its front end. It is pivoted and towed by coupler 04, and the center line of trailer 01 is centered around kingpin 02. The coupling angle θ with respect to the center line of tractor 03 can be freely set within a fairly large range. It is now possible to change to As a result, despite the large length of tractors and trailers, By greatly changing the connection angle θ, it becomes possible to make small turns. By the way, when driving on a highway, etc., for safe operation of the tractor, the coupler and king Rather than completely freeing the relative rotation of the pin, it is better to reduce the amount of training when the connection angle θ is in the range of ±θm. It provides relatively small resistance to the rotation of the trailer, and in the range exceeding ±θm, the trailer It is preferable to provide relatively large rotational resistance to. This changes direction quickly In such cases, reduce the reaction force on the tractor by the trailer and reduce the jacking of both. This is because it is useful for preventing a sharp increase in the rotation angle like a knife. However, conventionally, rotational resistance is applied between the two in response to changes in the connection angle. No means have been developed to do so.

0003

[Problem that the idea aims to solve]

This invention was proposed in view of these circumstances, and the connection angle can be compared as needed. When the connection angle is relatively small, compare the rotation resistance, which is relatively small, and when the connection angle is relatively large. A semi-trailer that provides high rotational resistance to improve driving stability and safety. The purpose of this invention is to provide an anti-jackknife device.

0004

[Means to solve the problem] To this end, the present invention is designed to install a kingpin slightly in front of the kingpin on the underside of the front end of the trailer. Vertical resistance pin that can be retracted remotely via an actuator. and a pair of jaws that are recessed in the coupler of the tractor and grip the king pin. The distance between the kingpin and the resistance pin is centered around the kingpin fitting hole formed by the It is an arcuate groove whose radius is the distance, and has a groove width into which the lower end of the resistance pin is inserted. At the same time, there is a central deep groove of a constant depth formed in the central part and a continuous groove on the left and right ends. The arc-shaped resistors are each formed symmetrically and consist of a shallow groove at the end where the depth of the groove bottom gradually decreases. It is characterized by having anti-grooves.

[0005]

[Effect]

According to this configuration, the resistance on the trailer side is reduced by the operation of the actuator. The pin is forced downward and its tip is pressed with appropriate force against the bottom of the resistance groove on the tractor side. Since they are attached, rotational resistance is applied to the trailer when both of them rotate. At that time, for example, in a range where the rotation angle is relatively small, a relatively small constant resistance is applied to the rotation. A relatively large rotation that gradually increases in proportion to the increase in rotation angle in a range where the rotation angle is relatively large. The jackknife reaction that the trailer exerts on the tractor by providing resistance This makes it possible to reduce the

[0006]

【Example】

One embodiment of the present invention will be explained with reference to the drawings. Figure 1 shows the connecting portion immediately before the connection. A side view showing the state, Figure 2 is a plan view taken along II-II in Figure 1, and Figure 3 is a view during running in Figure 1. A cross-sectional view along III-III, Figure 4 is a line showing the relationship between connection angle and resistance in Figure 3. It is a diagram.

[0007] In the above figure, the same reference numerals as in Figs. 5 and 6 indicate the same members as in the same figure, and The major difference in the design from the structure shown in the same figure is the appropriate adjustment of the trailer king pin 02. A movable resistance pin is provided protruding forward by a distance d, and the above-mentioned The reason is that the arc-shaped resistance groove into which the resistance pin is inserted is recessed. First, in Figures 1 to 3, 1 is a king pin protruding from the lower surface of the front end of the trailer. Resistance pin 1 is a vertical resistance pin that protrudes downward at a distance d in front of pin 02. It is formed at the lower end of the piston rod 4 of the air pressure cylinder 3. 5 is the piston The restoring spring 6 of the rod 4 is centered on the king pin fitting hole of the coupler 04 and has a radius d. An arcuate resistance groove recessed symmetrically over a center angle of approximately 120°, and its depth As shown in Figure 3, the bottom surface is horizontal within the range of ±θm, but the center In the range where the angle exceeds ±θm and reaches ±θmax = 60°, the depth of the groove gradually decreases. ing. 7 is an air tank that stores air for energizing the air pressure cylinder 3; 8 is a control tank; A pressure valve 9 is a solenoid valve, and 10 is operated in conjunction with a vehicle speed sensor 11. Relay switches 13 and 14 turn on when the speed exceeds the set value of 30km/h. a manual normally open switch inserted in parallel and in series with the relay switch 10; It is a manual normally closed switch.

[0008] In such a structure, in the state immediately before the trailer and tractor are connected, Figure 1 As shown in Fig. 1, the king pin 02 and the resistance pin 1 are in the position shown in Fig. 1, but the running During the process, the resistance pin 1 is normally energized and inserted into the resistance groove 6, as shown in FIG. It will be done. That is, as shown in FIG. 3, the vehicle speed sensor 11 detects a vehicle speed of 30 km/h or more. Then, the relay switch turns on, the solenoid valve 9 opens, and the air from the air tank 7 is released. A biases the air pressure cylinder 3 through the pressure regulating valve 8, so the resistance pin 2 moves downward. Its tip abuts against the groove bottom of the resistance groove 6 with a pressing force. Then, while driving, when the coupling angle θ changes, in the range θm≦θ≦+θm , the tractor and trailer rotate relative to each other under constant resistance, −θmax <θ≦ -θm, +θmax ≧θ≧+θm, the tip of resistor pin 2 is at the bottom of a relatively shallow groove. In an abutting relationship, the trailer and tractor move against each other against linearly increasing resistance. It will rotate in opposition. Note that when the normally closed manual switch 14 is turned off, the air pressure cylinder 3 is energized. Since the frictional force acting between the resistance pin and the resistance groove becomes zero, the trailer - can be rotated relative to the tractor without resistance. Also, a normally open manual When the switch 13 is turned on, rotational resistance is applied regardless of the vehicle speed. In this way, by turning the manual switch on and off, the driver can Rotational resistance can be made zero or rotational resistance can be generated. For devices like this According to this, not only safe driving while driving, but also driving when reversing becomes very easy. further resistance When the pin is engaged, the resistance pin cooperates with the kingpin to aid in traction.

[0009]

[Effect of the idea]

In short, according to the present invention, the A vertical resistor that can be retracted remotely via an eclipse actuator. A resisting pin and a pair of screws recessed in the coupler of the tractor and gripping the king pin. Centering on the king pin fitting hole formed by the An arcuate groove whose radius is a distance of , and the groove width into which the lower end of the resistance pin is inserted It has a central deep groove of a constant depth formed in the central part and is continuous at the left and right ends. A circular arc consisting of a shallow groove at the end where the depth of the groove bottom gradually decreases and is formed symmetrically. By providing a shaped resistance groove, when the connection angle is relatively small, it can be used as needed. Provides relatively small rotational resistance, and relatively large rotational resistance when the connection angle is relatively large. In addition, anti-jacking mechanisms for semi-trailers improve driving stability and safety. The present invention is industrially extremely useful because it provides an if device.

[Brief explanation of drawings]

FIG. 1 is a side view showing the state of the tractor and trailer of the present invention immediately before they are connected.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III of the tractor and trailer in FIG. 1 while the tractor and trailer are traveling.

FIG. 4 is a diagram showing the relationship between the connection angle and rotational resistance in FIG. 3;

FIG. 5 is an overall side view of a known semi-trailer.

FIG. 6 is a plan view showing a state during direction change in FIG. 5;

[Explanation of symbols]

1 Resistance pin 3 Air pressure cylinder 4 Piston rod 5 Restoration spring 6 Resistance groove 7 Air tank 8 Pressure regulating valve 9 Solenoid valve 10 Relay switch 11 Vehicle speed sensor 13 Normally open manual switch 14 Normally closed manual switch 01 Trailer 02 Kingpin 03 Tractor 04 Coupler

Claims (1)

[Scope of utility model registration request] Claim 1: A vertical resistance pin provided slightly in front of the king pin on the lower surface of the front end of the trailer and capable of appearing and retracting by remote control via an actuator; and a pair of vertical resistance pins recessed in the coupler of the tractor to grip and hold the king pin. An arc-shaped concave groove whose center is the king pin fitting hole formed by the jaw and whose radius is the distance between the king pin and the resistance pin, and has a groove width into which the lower end of the resistance pin is inserted, and a groove in the center thereof. An arc-shaped resistance groove is provided, consisting of a central deep groove of a constant depth formed, and end shallow grooves that are formed continuously and symmetrically at the left and right ends of the groove, and the depth of the groove bottom gradually decreases. Features a semi-trailer anti-jackknife device.