DE102004052335A1 - Towbar, especially for a truck - Google Patents

Abstract

A trailer hitch (1) is used in particular for a truck. It has a catching jaw (2) which is formed by two catching plates (4, 5) located opposite one another. One of the catch plates (4) is provided with a coupling head (6) having a mechanism (7) for displacing the coupling pin (3). The mechanism (7) also includes an anti-rotation device (10) for the coupling pin (3). In the opposite catching mouth (5), a further rotation lock (11) is provided for the coupling pin in order to be able to form the first rotation lock (10) in a more compact manner.

Description

The The invention relates to a trailer hitch for one Lorries according to the generic term of claim 1

From the DE 299 16 695 U1 a hitch is known which has a coupling jaw and a coupling head. A coupling pin is displaceably guided between a coupling position penetrating the coupling jaw and a release position withdrawn into the coupling head. In addition, the coupling head has a mechanism for displacing the coupling pin. This mechanism consists of several interacting levers, wherein an actuating lever engages in a slot-shaped recess of the coupling pin. This actuating lever bil det thus at the same time a rotation for the coupling pin.

Of the Invention is based on the object, a trailer hitch of the aforementioned To create kind, which stands out by a small-building coupling head distinguished.

These Task is according to the invention with the Characteristics of claim 1 solved.

The trailer hitch according to claim 1 is in particular for Lorries provided, but may also be for other vehicles, such as Forklift, cart or agricultural vehicles used become. The trailer hitch has a catch mouth that a trailer drawbar in the correct Location for coupling leads. This jaw consists of at least two opposite Catch plates, preferably one above the other are arranged. At one of the catch plates, in particular at the upper catch plate a coupling head is provided which has a mechanism for shifting a dome pin contains. The coupling pin is between a passing through the coupling jaw Coupling position and retracted in the coupling head release position slidably guided. To an unwanted To prevent twisting of the dome pin is in the coupling head also a rotation for provided the coupling pin. Especially with heavy trailer loads exercises the trailer drawbar when cornering a considerable torque on the coupling pin out, so that the rotation should be designed according solid. However, this leads to a considerable amount of space in the coupling head, as in this way all the pivot lever of the adjusting mechanism for the dome pin should be formed correspondingly massive. To a small-scale To realize coupling head, is provided according to the invention, an additional Provide anti-rotation on opposite the coupling head catch plate. This additional Anti-rotation lock can during driving with a heavy trailer pick up the high torques and keep them away from the coupling head. The provided in the coupling head anti-rotation ensures only in the open position for one exact alignment of the dome pin, so that this correctly in the Non-rotation of the catch plate dips. In the release position occur However, no significant torques, so that in the Coupling head provided against rotation very weak can be. this makes possible the realization of a small-sized adjustment mechanism for the coupling pin and thus a compact coupling head.

Around To ensure that the provided in the coupling head against rotation no high torque must take up, it is according to claim 2 advantageous if provided in the coupling head rotation a bigger game as the further rotation on the catch plate has. This works provided in the coupling head rotation only at a Rotation of the coupling pin by a larger angle of rotation than the other Anti-rotation lock in the catch plate permits. This is the rotation Ineffective in the coupling head, as long as the coupling pin in the dome position is located. The high, while driving occur Torques are therefore effectively kept away from the coupling head.

to Achieving a simple mechanism in the coupling head is according to claim 3 cheap, though formed the further anti-rotation to accommodate larger torques is considered as the rotation provided in the coupling head.

Around to make sure that Dome pegs completely immersed in the further rotation, it is according to claim 4 advantageous if the further rotation self-centering is trained. in principle it is enough that the self centering effect of further anti-rotation on one Limited rotation angle, essentially the game provided in the coupling head Correction corresponds or slightly exceeds this game. This ensures that that the Coupling pin is inserted exactly in the anti-twist device.

A simple and at the same time effective implementation of further anti-rotation is apparent from claim 5. In this case, the coupling pin on a one-sided chamfer, wherein in a receiving bore or receiving socket of the catch plate, a further rotation preventing forming plate protrudes. This plate cooperates with the chamfer of the coupling pin and ensures an exact position of the coupling pin in the direction of rotation. Due to the chamfer of the dome pin is also a sufficient self-centering of the further rotation assurance reali Siert. Since the plate protrudes into the receiving bore or socket, it can be well set within this to accommodate high torque can. It is also advantageous that this plate increases the overall volume of the trailer hitch in any way.

Finally is it according to claim 6 cheap, though the plate from the inside edge of the receiving bore or receiving socket is spaced. This ensures that the coupling pin initially clean can penetrate into the locating hole or bushing before moving centered in the direction of rotation on the further anti-twist device. This leads to a cheap one Alignment of the dome pin in the radial direction when the dome pin is centered in the direction of rotation. This measure increases the reliability of the coupling process.

Of the Subject of the invention is exemplified with reference to the drawing, without to limit the scope of protection.

It shows:

1 a longitudinal sectional view of a trailer hitch and

2 an associated sectional view along the section line II-II.

A trailer hitch 1 according to 1 consists of a catch mouth 2 in which a dome pin 3 is guided axially displaceable. The catch mouth 2 is from two opposite catch plates 4 . 5 formed, with the upper catch plate 4 a coupling head 6 is formed. Alternatively, the coupling head could 6 also as a separate part on the upper catch plate 4 be mounted.

In the coupling head 6 there is a mechanism 7 for axial displacement of the dome pin 3 , This mechanism 7 has in particular a swivel arm 8th on, in a slot-shaped recess 9 of the dome pin 3 intervenes. The swivel lever 8th forms together with the recess 9 an anti-rotation device for the coupling pin 3 ,

In the lower catch plate 5 is another twist lock 11 provided essentially from a plate 12 is formed. This plate 12 is in a receiving hole 13 held. The receiving bore 13 is cylindrical, with the plate 12 the receiving hole 13 Clutch inside narrowed. The dome pin 3 also has a chamfer on the inside of the coupling 14 on that with the plate 12 interacts.

The anti-twist device 11 in the coupling head 6 has a game that is essentially the dimensions of the pivot lever 8th and the recess 9 is determined. This rotation lock 10 only causes a pre-centering of the dome pin 3 , When penetrating the dome pin 3 into the receiving hole 13 becomes the chamfer 14 against the plate 12 pressed so that the coupling pin 3 is centered. He automatically takes his correct position within the mounting hole 13 one. Due to the game in the rotation 10 is also achieved that the coupling pin 3 in the illustrated coupling position no torques on the pivot lever 8th can exercise.

In the sectional view according to 4 you can see that the plate is 12 essentially circular section in the receiving bore 13 extends to achieve the desired centering effect. The plate 12 is with a welding bead 15 in the receiving hole 13 established. Alternatively, the receiving bore could 13 also in one piece with the plate 12 be created.

1

trailer hitch

2

jaw

3

coupling pin

4

upper baffle

5

lower baffle

6

coupling head

7

mechanism

8th

pivoting lever

9

recess

10

twist

11

twist

12

plate

13

location hole

14

bevel

15

bead

Claims (6)

Trailer coupling, in particular for a truck, wherein the trailer coupling ( 1 ) a jaw ( 2 ), which of at least two opposing catch plates ( 4 . 5 ) is formed, wherein at one of the catch plates ( 4 ) a coupling head ( 6 ), which provides a mechanism ( 7 ) for moving a dome pin ( 3 ) between a coupling jaw ( 2 ) penetrating coupling position and one in the coupling head ( 6 ) has withdrawn release position, and in which an anti-twist device ( 10 ) for the coupling pin ( 3 ) is provided, characterized in that at the coupling head ( 6 ) opposite catch plate ( 5 ) another anti-rotation device ( 11 ) for the coupling pin ( 3 ) is provided. Trailer coupling according to claim 1, characterized in that in the coupling head ( 6 ) provided rotation ( 10 ) a larger game than the further anti-rotation device ( 11 ) having. Trailer coupling according to claim 1 or 2, characterized in that the further anti-rotation device ( 11 ) is designed to accommodate larger torques than those in the coupling head ( 6 ) provided. Trailer coupling according to at least one of claims 1 to 3, characterized in that the further anti-rotation device ( 11 ) is self-centering. Trailer coupling according to at least one of claims 1 to 4, characterized in that the coupling pin ( 3 ) a one-sided bevel ( 14 ), wherein the further rotation ( 11 ) from one into a receiving bore ( 13 ) or bushing of the catch plate ( 5 ) projecting plate ( 12 ) is formed. Trailer coupling according to claim 5, characterized in that the plate ( 12 ) from the coupling jaw through the inside edge of the receiving bore ( 13 ) or socket is spaced.