DE20305983U1 - Portable feed mixing unit with two vertically positioned mixing worms, driven by distributor gear positioned in line with drive train - Google Patents

Abstract

The transmission devices (22, 23) of the mixing units (10, 12) are driven by a distributor gear (17). The central axes of the output shafts, the distributor gear (17), and the transmission devices (22, 23) are all positioned in line (34) with the meeting point (35) at the transmission gear (23). A central wheel, located between the two bevel wheels is also positioned on the line (34) intersecting with the meeting point (35). The housing of the distributor gear (17) is of an angular shape with both sections meeting at the line (34).

Description

B. Strautmann & Sons
GmbH & Co.
49196 Bad Laer

Drive device for vertical mixing augers on a feed mixer

The present invention relates to the drive device for vertical mixing screws on a feed mixer in the design according to the preamble of claim 1.

Feed mixers with two vertical mixing rollers are used on farms to mix and distribute livestock feed.

The mixing rollers are generally driven by mechanical drive elements which are set in motion by the power take-off shaft of a tractor. In order to reduce the load on the drive elements, the mixing augers are generally driven separately. The torque, for example taken from the power take-off shaft of a tractor, is first fed to a distributor gear which has a separate output shaft for each mixing auger. The drive of the gear which drives the front mixing auger is generally designed in such a way that the drive shaft of this gear and the output shaft of the distributor gear have a common central axis which also corresponds to the longitudinal central axis of the feed mixer. The housing of the distributor gear is often directly connected to the housing of the gearbox, for example by a flange connection.

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The drive of the gearbox of the rear mixing auger is generally via a parallel output shaft of the transfer case, offset from the central axis, which is connected to a drive shaft of an intermediate gearbox arranged in front of the rear gearbox or via the connection between the output shaft and the drive shaft of the gearbox via an intermediate shaft equipped with one or two universal joints, or via a cardan shaft.

Both of the above arrangements make it possible to bypass the front gearbox, but due to the high torques to be transmitted, a powerful and expensive intermediate gearbox must be used or the universal joints of the drive train must be designed to be very powerful.

The alternating loads in the universal joint bearings caused by the kinematics of the universal joints, due to the deflection angles, the irregularity of the rotational speed of the intermediate shaft and the additional axial and radial forces on the input and output shafts lead to increased wear and high alternating stresses in the universal joints, on the input and output shafts and their bearings. The service life of these machine elements is noticeably reduced. The uneven running also leads to increased noise.

In order to avoid the aforementioned disadvantages, such as an expensive intermediate gear or the high loads, reduced service life and increased noise caused essentially by the bending angles of the universal joints, a solution is proposed according to the invention which provides a drive train lying on an aligned line which leads from the output shaft of the transfer case to the drive shaft of the gearbox of the rear mixing auger.

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The invention is described below using an embodiment and illustrated in the drawings.

Fig. 1 shows a feed mixer with the drive device in a
Side view.

Fig. 2 shows a top view of Fig. 1.

Fig. 3 shows an overview of the drive device.

Fig. 4 shows a section through the transfer case.

The feed mixer wagon is attached to a tractor (not shown in detail) using the towing eye 5) in the trailer coupling 1). The power take-off shaft 2) of the tractor drives the drive device 14) of the feed mixer wagon 3). The feed mixer wagon 3) essentially consists of the chassis 4) with the towing eye 5), the axle 6), the wheels 7) and the attached mixing container 8) with the mixing chamber 9) and the mixing augers 10) arranged therein, each of which consists of a vertical central axis 11) which is equipped with an auger spiral 12) which tapers conically towards the top and is equipped with tools 13) on the outer edge.

The drive device 14), consisting essentially of the drive shaft 15), the intermediate shaft 16 connected to it, the transfer case 17), which is provided with the drive shaft 18) and two output shafts 19) and 20), the drive train 29), drives the mixing screws 10) via its gears 22) and 23), which receive the central axes 11) at their lower ends. The gears 22) and 23) are attached under the bottom 31) of the mixing container 8).

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The speed and power delivered by the PTO shaft 2) are fed via the universal joint shaft 15) and the intermediate shaft 16) to the drive shaft 18) of the transfer case 17). Here, the power required to drive the front mixing auger 10) is passed on to the drive shaft 24). The transfer case 17) is flanged to the gearbox 22). The output shaft 19) is provided with an inner profile, which is placed on the drive shaft 24) provided with a toothed profile. A bevel gear 26) is rigidly attached to the drive shaft 18) of the transfer case 17).

The output shaft 19) is connected via its flange to the bevel gear 26) by means of shear bolts 36) or similar. If the front mixing screw 10) is overloaded, this ensures that the drive to the rear mixing screw 10) is maintained.

The rear mixing screw 10) is driven by the bevel gear 26) which, in order to maintain the direction of rotation of the rear mixing screw 10), drives the bevel gear 27) via an intermediate gear 28), which is here connected to the flange of the output shaft 20) via shear screws 37) or the like to secure the rear mixing screw 10).

The center axes of the output shafts 19) and 20) form alignment lines 32) and 33) which intersect at the vanishing point 35) in the gear 23) on the center axis. A alignment line 34) also extends from the center axis of the intermediate gear 28) and is directed towards the vanishing point 35). The cone angles for creating the bevel gears 26) and 27) and the intermediate gear 28) are also directed towards the vanishing point 35) or have their center here.

The drive train 29) arranged on the alignment line 33) can be manufactured by means of joints without changing direction if the drive shaft 25) of the gearbox 23) is aligned with the alignment line 23). The stresses are reduced so that lighter and possibly rigid connecting couplings can be used.

The housing 38) of the transfer case 17) is designed with its sides 39) and 40) in such a way that the angle a) between the alignment lines 32) and 33) corresponds to the angle b) on the housing.

The feed to be mixed is tipped into the mixing chamber 9) of the mixing container 8) which is open at the top by mixing screws 10) which rotate in the same direction and relatively slowly and run at a synchronous speed. If an overload occurs during the mixing process due to feed components that are difficult to mix or foreign bodies, each mixing screw 10) is protected separately by overload couplings, such as the shear screws 36) and 37) which are attached to the bevel gears 27) and 28).

After the mixing process, the feed is emptied through an opening 41), which is opened by a hydraulically operated slide 42), onto a cross conveyor belt 43) and is deposited from there to the right or left side of the feed mixer wagon 3).

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Claims (4)

1. Drive device for vertical mixing augers on a feed mixer wagon which can be driven by a tractor or is designed as a self-propelled vehicle and which has a mixing chamber with two rotating, upwardly tapering mixing augers which are driven mechanically by gears below the mixing chamber floor via drive elements from the power take-off shaft of the tractor or self-propelled vehicle, characterized in that the gears 22 ) and 23 ) assigned to the mixing augers 10 ) are driven via an upstream distributor gear 17 ), the center axes of the output shafts 19 ) and 20 ) of the distributor gear 17 ) and those of the drive shafts 24 ) and 25 ) of the gears 22 ) and 23 ) each forming a line of alignment 32 ) and 33 ) whose common point of alignment 35 ) is in the gear 23 ). 2. Drive device according to claim 1, characterized in that the intermediate gear 28 ) arranged between the bevel gears 26 ) and 27 ) lies on a line of alignment 34 ) which intersects the vanishing point 35 ). 3. Drive device according to claims 1 and 2, characterized in that the housing 38 ) of the transfer case 17 ) has an angular shape, the angle a) of which corresponds to the angle b) between the alignment lines 32 ) and 33 ), the housing sides 39 ) and 40 ) abutting in the region of the alignment line 34 ). 4. Drive device according to claims 1-3, characterized in that each bevel gear 26 ) and 27 ) is equipped with an overload clutch.