DE3212085A1 - Trailer coupling - Google Patents

Abstract

A trailer coupling, in particular for use with tractors in agriculture, forestry and the building industry, consists of a catch mouth (1) and a pivot pin (2) which is connected thereto and is rotatably mounted in a bore (3b) of a housing (3) which is fixed to the vehicle. A wire (4) which is inserted in a channel which is formed from a circumferential groove (2a) in the pivot pin (2) and a circumferential groove (3a) lying in the housing (3) opposite the said groove (2a), serves to fix the pivot pin (2) axially. So that the trailer coupling cannot be rotated with respect to the housing (3) until a predetermined torque is exceeded, the wire (4) is inserted into the channel with a specific degree of prestressing. <IMAGE>

Description

trailer hitch

The invention relates to one in the preamble of claim
trailer coupling described in more detail.

To the connection of the pivot of the trailer coupling with the
tractor-proof housing, some requirements are made that
van the known trailer hitches not yet partially fulfilled
became. The most important requirement is that it is safe
axial fixation of the trailer coupling with respect to the housing, so that
Due to the alternating load that occurs repeatedly during use, there is no rattling of the connection. The implementation of this requirement is made more difficult by the fact that the trailer coupling must be rotatable against the housing under the influence of a torque exceeding a predetermined amount. The specified torque is set very low and allows the driver of the vehicle or another person to turn the trailer coupling manually if necessary. These in themselves contradicting demands are acceptable
Up to now, only meet at the same time with the acceptance of increased construction costs.

A known trailer coupling, in which both requirements are likely to be met, has a pivot pin in the vehicle-side housing
Fengmaul's evenly surrounding sack-shaped annular space, in which an elastic member, a rubber ring and a steel ring of the same size, is inserted into the annular space , which corresponds to about a fourth of a circular area.

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When the rubber ring is in the pretensioned condition, the stub ring is also included its recess at one in the semicircular circumferential groove of the An open ring made of steel wire is inserted into the screw on, and applies εα the mouth with one of these with one Shoulder to the housing pressing axial force. At the same time, this arrangement allows a rotation of the catch mouth relative to the Housing, once a specific one, by choosing the preload of the rubber ring adjustable torque is exceeded.

A disadvantage of this known arrangement, however, is that the production and assembly of the required items is relatively expensive. So first of all, a suitable wire is used to measure the diameter the circumferential groove in the trunnion to produce a ring that is matched to the circumferential groove. Also is going to put the ring-shaped steel wire into the groove of the inside of the housing To be able to insert the inserted pivot pin, an auxiliary device is required with which the rubber ring is previously pressed together so ujeit can be until the steel ring has completely released the groove.

The object of the invention is to provide a trailer coupling of the initially described type in such a way that the axial fixing of the Muzzle in the housing can be carried out more easily and without the use of relatively expensive aids.

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The solution to this problem is in the characterizing part of the claim 1 and allows a straight wire to be knocked in or pressed into the channel to counteract the dss catching mouth Movements in both axial directions set as the wire is clamped practically free of play both in the pivot and in the housing.

By dss feature of claim 2 it is ensured that when the wire is introduced, no fretting of any of the coming into contact Component occurs.

DE-OS 1 ** OQ 220 already provides a backup axial displacement of an inner part, e.g. B. an Idelle, in an outer part with a wire became known. Such backups are only intended to prevent an unwanted axial To prevent shifting of the inner part. That, after suitable coordination, such a safety device also acts as an anti-twist device which only triggers after a specified torque is exceeded, is to use, did not know to be expected. Rather, it had to be it can be expected that with such low tension as had to be set to generate the release torque with trailer hitches, a rattle-proof axial fixing of the catching mouth cannot be implemented is.

The invention is described in more detail below with reference to a drawing

Fig. 1 is a sectional view of a trailer coupling and Fig. 2 is a sectional view of the trailer coupling along the line

A - B in Fig. 1.

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The trailer coupling shown consists of the catch 1 and dcTun subsequent cylindrical pivot pin 2 with incorporated Circumferential groove 2a. The coupling bolt belonging to the catch mouth 1 for Locking the attached vehicle is for the sake of simplicity not drawn. The pivot pin 2 is attached to a tractor with little play in a bore of the Lüeise, not shown Housing 3 inserted. The hole is exactly opposite the circumferential groove 2a, an equally large groove 3a, which complements the circumferential groove 2a to form a circular channel 2a, 3a, is incorporated. This

Seen "2 channel 2a, 3a, as shown in FIG. 2, 'via a tangential, rectilinear bore accessible from the outside. In the channel 2a, 3a, a wire is inserted h, the diameter of the of the channel 2a, 3b tuned is that the wire U between the FBngmaul and the pivot pin generates a precisely predetermined axial pretension

".5 twisting of the mouth is only possible after overcoming the Preload force caused torque possible.

__. While the jaw 1 and the pivot pin 2 as relatively soft

Forged part is executed, the twist h is made of a relatively hard spring wire, which reliably prevents seizing when the wire k is brought into the channel 2a, 3a. This introduction of the wire k takes place, for. B. by a few blows with a hammer. On the other hand, to ensure that the wire i * is undesirably pushed out of the channel 2a, 3a when the catching mouth 1 is twisted, the wire k is caulked in its end region.

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Claims (2)

Claims Trailer coupling, in particular for agriculture, forestry and / or construction Usable tractor, consisting of a catch mouth with coupling bolts and an adjoining cylindrical pivot pin, which can be rotated in a bore of a housing fixed to the vehicle stored and in the axial direction with respect to the housing by a is set in a circumferential groove of the pivot pin that protrudes over the outer contour of the pivot pin and is in its vehicle-related area under pretension on the housing supports, characterized in that a circumferential groove (3e) is also provided in the bore of the housing (3) which, together with the circumferential groove (2a) in the pivot pin (2), forms an "annular channel (_2a ) corresponding in cross section to the wire (U) , 3a) adds that the dimensions (diameter) of the wire (U) in comparison to the dimensions of the channel (2e, 3a) are chosen so that the trailer coupling can only be rotated after a predetermined torque has been exceeded with respect to the housing (3) and that the annular channel (2a, 3a) via one in its Plane tangentially arranged extension (hole (3b)) at least the same dimension is accessible. XAVER FeWt 8952 MAR KTO B ER DO R F W-E. LtE £ -LD S XRA-ELa E_ai JohEnn-Gtorg-Ftndt-Str. U ANR: 1 001 523 ^Fe 1376
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03/22/62 2. Trailer coupling according to claim 1, characterized in that the surface hardness of the Fengmsuls (1) and the wire (^) used materials considerably from one another differs. Copy KAUUEL-MP (do «) jn U ₁ . »'1S'f DtESELAOSViHDT POS ¹ "" ι 'κ UQNCHEN O ". »07 min (EniATZTtii.DitN * T | HYPO-BAWK VOLK5BAHK. KHtISSPAJlKASSE UAHK7OBE «DO ' EAHK AUQ3 "U" a COUUERZBAHK U LZB ICAUFBEURI