DE2853439A1 - STEERING TRANSMISSION AND TRANSLATION DEVICE ON SELF-DRIVING REAR-JOURNED LANDMARKERS - Google Patents

Description

DIPL.-ING.ORKRETZSCHMAR _2HAMBÜRG1

AT STROHHAUSE 3 "PATENTANWALT - \" * ■ RUF O4O / 24 67 43

Company 'K / B / mk - 5541

Jungheinrich Corporate

administration KG ^! ο n _v -p-yes-

20Q0 Hamburg. · - -. .

Lawyer File .55Λ1

steering transmission and translation device on self-fanping loops. Industrial trucks

The invention relates to a steering transmission and translation device on self-propelled rear-steered industrial trucks, in particular lift trucks designed according to the counterweight principle with at least one steerable rear wheel _t attached to a turntable using chain drives and an intermediate shaft arranged in the rear of the device with two identical or preferably different sized sprockets.

In the case of such trucks, the transfer from Driver initiated in the hand steering wheel steering movement between this and the at least one on the rear of a rotary ■ Steering wheel located on the stool requires a reversal of the direction of rotation from the hand steering wheel to the steered rear wheel. Further must be the moment applied by the driver on the hand steering wheel, which

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ACCOUNTS: DRESDNER BANK <BLZ 2OO 8OO OO) ACCOUNT NO. 9 229 371 POST CHECK HAMBURG (BLZ 2OO 1OO 2O) MR. t937 66-2O8

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do not exceed a reasonable level in terms of height should be reinforced so that a steering movement of the rear wheel is guaranteed even under unfavorable working conditions is.

To meet these requirements, use mechanical transmission elements, known for example: The steering shaft connected to the hand steering wheel ends in a single-stage gear transmission. This causes the direction of rotation to be reversed and if the gear ratio is selected accordingly, it also contributes to the steering torque gain. The other The connection from the steering gear to the rear wheel is then accomplished via one or more pull chains. As a result of the steering torque gain the subsequent chain drives must be designed to be correspondingly strong in the area of the steering shaft be. In driving riots, vibrations occur to a greater extent, apart from the fact that the strong chain drives also involve considerable effort in terms of leadership. Since the location of the sprockets is mostly from spatial If a chain guide at the same level or at the same level is not permitted, a chain guide is then installed in the rear of the device Intermediate shaft equipped with two differently sized sprockets arranged to compensate for height differences and takes over the rest of the required steering torque gain.

The disadvantage of this embodiment is the high cost mechanical components, in particular with the inclusion of a steering gear. Maintenance is also complex. Will In addition, if a hydraulic device supporting the steering force is used, its pump is usually in the rear and the

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Reinforcement device arranged in the steering column. The power flow that takes place is then very cumbersome and increases the effort.

The invention is based on the object of providing a simple, with respect to the load, for the aforementioned industrial trucks favorably stressed steering transmission systems consisting of chain drives and to create translation facility that as well is easily accessible for maintenance work and allows an economical and favorable design of the chain drives.

This object is inventively elöst _o that ei chain drives are zv / provided, one of which is guided over a chain sprocket on the hand steering wheel and is driven and engaged with a sprocket of the intermediate shaft engaged such that a rotation is reversed, and in that the translation in the field of Intermediate shaft and the second chain drive between the intermediate shaft and a chain ring or a chain guide is provided on the turntable.

This makes it a simple design in the area of the hand steering wheel and reached to the rear of the Fahrζeug tail, with the transmission parts can be easily designed towards the rear of the vehicle and also by the concentration of the steering torque amplification assembly and maintenance on the rear of the vehicle are facilitated. Also the management of the first chain drive is simplified by its possible, relatively easy design.

A chain pinion mounted on the rear of the first chain drive is particularly advantageous in this case, a chain wheel on the Intermediate shaft assigned in such a way that the chain of this first

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2953433

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Chain drive with this sprocket on one side along an engagement sbogens is engaged. This becomes the first chain drive a self-contained assembly, which simplifies installation and maintenance. The lightly executed one is useful here first chain drive housed on one side of the industrial truck in an externally accessible channel, with the Chain sprockets arranged at the rear towards the truck side outwards, while at the same time releasing the chain intervention can be removed with the sprocket on the intermediate shaft.

This type of honing of the rear-mounted chain sprocket also includes the fact that in this area a favorable tension with a guarantee of a sufficiently large pressure angle is achieved because the first chain drive as a self-contained chain guide with an outside with the associated Sprocket engages on the intermediate shaft.

It is preferred that the translation is essentially in the second short chain drive in the rear of the vehicle between the turntable and the associated sprocket is provided on the intermediate shaft. This enables cheap translations reach.

In an advantageous further embodiment, the intermediate shaft be divided or are the sprockets on the intermediate shaft with the interposition of a torque amplifier individually stored. Such torque amplifiers are known and available.

Special advantages are that the use of a relatively expensive gear steering gear can be dispensed with, and that essential components of the steering device are

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can be held moderately easily. Furthermore, this structure allows the spatially favorable arrangement of an additional, the Steering torque supporting device.

According to a further advantageous embodiment on an industrial truck, on which the steerable rear wheel is also the drive wheel, is the chain ring or the chain guide of the second chain drive on the steerable rear wheel fixed housing component of a steered, turntable-like mounted wheel drive.

The invention is explained below with reference to an embodiment shown schematically in the drawing.

The drawing shows a top view of a three-wheel industrial truck with rigidly arranged front wheels and a rear wheel mounted on a turntable so that it can be steered.

This includes the fact that either the front wheels 2, 3 or the rear wheel 4, and possibly also all of the wheels, are driven are. The drive means are not shown in more detail, since designs are known in this regard.

The hand steering wheel 5 installed on the front, which also has an operator's seat is assigned, is connected to a chain pinion 6 via its central steering column; of this one becomes a first Chain drive 17 driven. His chain 11, which engages around the chain pinion c, is via pulleys 7, 8, the number of which is determined by spatial conditions, led to a chain pinion 9 arranged in the rear of the vehicle. Here is the

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advantageous embodiment can be seen that the first chain drive on a part of the structure of the truck within a channel 18, which is particularly accessible from the outside, is accommodated in which the chain pinion 9 from the vehicle side is also accommodated can be arranged in its storage so that it can be installed and removed. This chain sprocket is close to an intermediate shaft IjS arranged with two sprockets 10 and 12, behind this intermediate shaft and in such a way that the chain 11 the associated sprocket 10 is not looped around, but is held in engagement from the outside over a sufficient arc. Through this not only a reversal of the direction of rotation or the direction of rotation of the hand steering wheel 5 and intermediate shaft 15 is effected, but at the same time, the ease of installation and expansion is facilitated.

The chain wheel 12, which is preferably designed with a smaller diameter than the chain wheel 10, is also arranged on the intermediate shaft 13. This drives the chain 14 of the second chain drive 19, which transmits the steering movement through its chain to a chain ring or chain guide 16 on the turntable 15, and thus to the steered wheel A- attached to it.

It can thus be seen that the torque gain is limited to the The rear of the vehicle is concentrated and thus the chain drive 17 can be carried out easily and relocated so that it is easy is accessible.

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Claims (6)

2853433 DIPL-IMCO. R.KRETZSCMJMJVIR aim «sas baose 3« Em) B = jo * aa «4 07« 3 Flasks. Έ / M / wL - 5541 riiEiL
ö MG- 5541 Claims Steering transmission and translation device on self-propelled rear-steered M-urförderzeugen, in particular designed according to the counterweight principle with at least one steerable one attached to a turntable Rear wheel, using chain drives and an intermediate shaft arranged in the rear of the device two sprockets of the same size or preferably of different sizes, characterized in that two Chain drives (17, 19) are provided, one of which (17) is guided via a chain pinion (6) on the hand steering wheel (5) and is driven and with a sprocket (10) of the intermediate shaft (13) engages in such a way that a reversal of the direction of rotation takes place, and that the translation in the area of the intermediate shaft (13) and the second chain drive (19) provided between the intermediate shaft (13) and a chain ring or a chain guide (16) on the turntable (15) is. - 1 ACCOUNTS: DRESDNER BANK (BLZ2OO8OOOO) ACCOUNT NO. 922937t POST CHECK HAMBURG (BLZ 2ΟΟ1ΟΟ 2O) NO. 193766-2O8 030024/0536 ORIGINAL INSPECTED 2953433 2 .. Classification Each. Claim. 1, daetureh characterized in that a chain pinion (S) of the first chain drive (17) mounted on bearings is assigned to a chain wheel (10) on the intermediate shaft (13) in such a way that the chain (11) of this first chain drive {17} this sprocket (IG) is engaged on one side along an engagement arc. 3- In accordance with the rules . Claim 2, characterized in that the first chain drive (17) is of light design and is wholly or partially accommodated on one side of the industrial truck in a channel (18) accessible from the outside, the chain pinion (9) arranged at the rear towards the truck side outwards, below simultaneous release of the chain engagement with the sprocket (10) on the intermediate shaft (13) can be removed. 4. Device according to one of claims 1 to 3, characterized in that that the translation is essentially in the second short chain drive (19) in the rear of the vehicle between the Turntable (15) and the associated chain wheel (12) on the intermediate shaft (13) is provided, which is preferably smaller than the chain wheel (10) assigned to the first chain drive (17). 5. Device according to one of claims 1 to 4, characterized in that that the chain wheels (10, 12) on the intermediate shaft (13) with the interposition of a torque amplifier are stored individually. 6. Device according to one of claims 1 to 5, daaureh characterized, that the chain ring or the chain guide (16) of the second chain drive (19) on the steerable rear wheel (4) Fixed G-e housing component of a steered, turntable-type mounted wheel drive is. 0 3 0 0 2 4 / G H 3 6