DE102017116427A1 - Drive wheel for a chain drive of a tracked vehicle - Google Patents

Abstract

The invention relates to a drive wheel for a tracked drive of a tracked vehicle, comprising a base body which has at least one track and the torque from the drive wheel to the chain transmitting cams and that on the body independently detachable drive cams for transmitting the torque are arranged.

Description

The invention relates to a drive wheel for a tracked vehicle of a tracked vehicle, comprising a base body having at least one track and the torque from the drive wheel to the chain transmitting cam.

In the case of chain-driven construction machines, there are in principle two different drive concepts.

For small machines up to about 200 tons, the so-called "tractor" drive is used, in which case the drive wheel is designed similar to a gear wheel. These teeth have the task, on the one hand to drive the chain and on the other to provide for the deflection of the chain.

The drive takes place at the junction of the chain links.

In the tractor drives, the driving surfaces are distributed across the entire width (eg 14 out EP 0 672 004 B1 ).

The thus formed drive wheel is also referred to as a sprocket segment.

For hydraulic excavators, in the class greater than 300 tonnes, the drives are designed almost exclusively as a shuttle drive, i. the chain of shackles consists of one-piece cast chain links. These can be designed as flat or hawser. The caterpillar track and thus the tracked vehicle itself are driven by a drive wheel, the Turas. Here, the Turas usually consists of a one-piece cast body. It is important that - unlike the construction of a "Tractor" - drive - the function of the diversion is separated from the drive function.

In case of wear in the known one-piece versions, the entire units must be replaced, which makes the removal of the chain and / or the drive components required.

As prior art in Schaken drives are known as multi-part drive wheels Segmentturas and Dreischeibenturas.

In a segment tura, the drive wheel is divided into several segments according to the circumference. Drive cams and track form a unit.

In the Dreischeibenturas the Turas consists of a cast body, which forms the track, and two on both sides thereof arranged, rotatably connected thereto drive cam discs ( DE 10 2008 021 126 A1 ).

However, in the case of the above-mentioned multipart designs, it is the case that when the drive functional surfaces are worn for repair, complete segments and drive components must be removed.

The object of the invention is to provide a drive wheel in which wear on the drive cams can be easily and quickly corrected.

This object is achieved according to the invention with a drive wheel, comprising a base body having at least one track and the torque from the drive wheel to the chain transmitting cam, characterized in that the main body independently detachable drive cams for transmitting the torque are arranged.

The cams may individually on the main body of the drive wheel, or - as indicated - be mounted on both sides of the track or they are formed in combination as a pair of cams and releasably secured.

The core of the invention is thus the decomposition of the drive wheel in sub-functional units, in which case the cams are arranged individually and interchangeable on their own or in combination.

The body is the task of fastening and alignment of the drive segments and the deflection of the chain.

These cams are connected by means of positive and / or non-positive connection with themselves and the / the track units.

In the present case, the function of the drive is not accomplished by a tooth in the true sense, but via a drive cam.

The term "cam" generally refers to a protrusion that is fixed on a rotating shaft or disc and that transmits power to another part of a machine. In the present case, the cams transmit the driving force from the Turas to the corresponding cams of the chain links on the revolving chain of the tracked vehicle.

The drive cams are designed so that there are areas where the attachment and or fasteners are located.

For the replacement, ie replacement of cams, no further dismantling of other or other suspension components is necessary, so that there are considerable time and cost advantages.

The invention will be explained below with reference to the drawings.

• 1 eine perspektivische Darstellung des Antriebsrades (Turas) mit der Laufwerkkette,
• 2 eine Explosivdarstellung,
• 3 eine Befestigung eines einzelnen Nocken am Antriebsrad und
• 4 ein Nockenpaar.

Showing:

• 1 a perspective view of the drive wheel (Turas) with the drive chain,
• 2 an exploded view,
• 3 an attachment of a single cam on the drive wheel and
• 4 a cam pair.

In detail, the shows 1 a part of a drive chain 1 , with the individual chain links 2 , and the Turasrad diverting and driving the chain 3 , with a basic body 4 and the cam 5 , The main body has a running track 6 for the chain guide on.

As the 2 shows, protrude from the main body 4 laterally bolts 7 out, on which the individual cams 5 each attachable and are removable transversely to the plane of the body.

The attachment of the cam on the body can also - as in 3 shown and with 8th - made by means of screws, bolts, straight or wedge-shaped grooves, wedges and / or combination of all kinds.

This illustration is merely schematic and is intended to show only the separate arrangement of the cams, but not details of the connection. This should be positive and / or non-positive and be designed so that the basic idea of the invention, namely the easy solubility and thus selective interchangeability of the cam 5 is ensured without any assembly of other parts of the drive system or the chain.

The 3 and 4 show simplifies the formation of the cam.

As can be seen, the interchangeable cams can be individually ( 3 ) or as a cam composite or cam pair ( 4 ) are executed, wherein the cams are mounted laterally opposite to the main body.

The two cams are positively and / or non-positively connected to a functional unit. For this purpose, a connector 9 needed to bridge the lateral offset. This can either be connected in principle firmly with a cam or be inserted as an independent part in the cam assembly.

Since the drive cams are independent of the drive wheel main body, their production by any manufacturing processes such as casting, forging, 3D printing and Blechrohteilen is possible.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0672004 B1 [0005]
• DE 102008021126 A1 [0011]

Claims (6)

Driving wheel for a tracked vehicle of a tracked vehicle, comprising a base body (4) having at least one track (6) and the torque of the drive wheel on the chain (1) transmitting cam (5), characterized in that the base body (4) independently detachable drive cams (5) are arranged for transmitting the torque. Drive wheel to Claim 1 , characterized in that the cams (5) on the base body (4) in the composite formed as a pair of cams and are releasably secured. Drive wheel according to one of the preceding claims, characterized in that the cams (5) are positively and / or non-positively connected to the base body (4) and / or as a pair of cams. Drive wheel according to one of the preceding claims, characterized in that the cams (5) are hardened for wear improvement or provided with an applied wear layer. Drive wheel according to one of the preceding claims, characterized in that wear indicators are mounted on the cams, which facilitate visual recognition of the limit of permissible wear. Drive wheel according to one of the preceding claims, characterized in that the drive cams are produced by manufacturing processes such as casting, forging, 3D printing and sheet metal raw parts.

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