RU169103U1 - Combine threshing drum drive gearbox - Google Patents

Abstract

The utility model relates to the field of agricultural engineering, in particular to gear drives for the threshing drum of a combine harvester. The drive gear of the combine threshing drum is installed between the V-belt drive pulley (1) and the threshing drum (2). The gearbox includes two pairs of gears (4, 5, 7, 8) located on the shafts (3, 6) of the gearbox, one of which is in constant gearing. The driven gear is made in one piece with the output shaft in the form of a pinion shaft (8) with an internal gear ring (9). The pinion gear (4) located on the input shaft (3) of the gearbox is installed with the possibility of axial movement. The input shaft (3) of the gearbox is made with splined sections, the last of which are made with reduced tooth thickness, forming splined locks. The gearbox (2) is equipped with limiters (11) for the axial movement of the pinion gear and the gear shift mechanism. The technical result is to increase the reliability of the drive gear of the threshing drum. 2 ill.

Description

The utility model relates to the field of agricultural engineering, in particular to the drives of the threshing drum of a combine harvester.

A known drive mechanism of the threshing drum of a combine harvester, including a V-belt variator and an intermediate gear, located between the variator pulley and the drum shaft. The variator pulley is freely mounted on the drum shaft, and there is a coupling device for connecting the variator pulley or intermediate gear directly to the drum shaft. The intermediate gear is a gear located in the casing of the variator pulley on the drum shaft (patent No. DE 1213661, IPC A01F 12/56, publ. March 31, 1966).

A known drive of a threshing drum of a combine harvester, including a V-belt variator and a planetary gear, containing a sun gear that is constantly engaged, rigidly connected to the hub of the variator drive pulley, a ring gear and a number of satellites mounted on the carrier’s housing, as well as a device for locking the gearbox to the housing combine and variator pulley on the drum shaft, a planetary gear mounted on the drum shaft with the possibility of axial movement relative to its sun gear wheel and is equipped with an additional device for locking in one of the extreme positions of the specified gear on the body of the carrier (ed. license number SU 307767, IPC A01D 69/06, published. 07/01/1971).

The closest set of essential features to the claimed technical solution is the drive of the threshing drum of a combine harvester containing a V-belt variator, a gear reducer installed between the variator pulley and the drum shaft, which contains, in one common housing, two pairs of gears that are in constant gear. Driven and driving gears located on the drum shaft have splined sections in their internal cavities. The coupling device, which is constantly connected to the variator pulley, contains a shaped sleeve with splined sections freely mounted on the drum shaft and a plug designed for axial movement of the specified sleeve (author certificate No. SU 361766, IPC A01F 12/56, publ. 12.13.1972 g .)

The known design does not have sufficient reliability during operation.

The task to which the claimed technical solution is directed is to increase the reliability of the drive of the threshing drum of the combine.

The technical result coincides with the task and is achieved due to the fact that in the drive reducer of the threshing drum of the combine installed between the V-belt pulley and the threshing drum and including two pairs of gears located on the shafts, one of which is in constant engagement, and its driven gear is made with an internal gear ring, the switching mechanism, said driven gear is integral with the output shaft in the form of a pinion shaft, and the pinion gear located on the input m shaft is mounted for axial displacement, wherein the input shaft is formed with splined portions, the end of which is formed with a reduced tooth thickness, forming a splined locks furthermore provided with a gear delimited axially displaceable pinion.

The implementation of the driven gear in one piece with the output shaft in the form of a gear shaft made it possible to exclude additional parts that ensure the installation of the driven gear on the input shaft of the gearbox, and thereby increase the reliability of the design.

The installation of the drive gear with the possibility of axial movement made it possible to use it as a clutch when a direct gear is engaged and thereby increase the reliability of the structure.

Performing the input shaft of the gearbox with splined sections, the last of which are made with a reduced tooth thickness, forming a splined lock, which fixes the pinion gear, preventing the gear from switching off.

The presence of limiters of axial movement of the pinion gear in the gearshift mechanism limits the stroke of the gearshift fork, eliminating wear of parts, ensuring reliability of the structure.

All of the above essential features in the claimed combination make it possible to ensure the reliability of the drive gear of the combine threshing drum.

An analysis of the known technical solutions, carried out according to scientific, technical and patent documentation, showed that the set of essential features of the claimed technical solution is not known from the prior art, therefore, it meets the patentability condition of the utility model - “novelty”.

The utility model is illustrated by drawings:

FIG. 1 - sectional gearbox;

FIG. 2 - drive the threshing drum of the combine with the gearbox.

The drive gear of the threshing drum of the combine is installed between the V-belt drive 1 and the threshing drum 2.

The gearbox is made in two stages with direct (i = 1) and lower (i = 1.94) gears and contains two pairs of gears.

A drive gear 4 is mounted on the input shaft 3 of the gearbox, which is meshed with the driven gear 5 located on the intermediate shaft 6.

The drive gear 7, located on the intermediate shaft 6, is in constant engagement with the driven gear, made in one piece with the output shaft in the form of a gear shaft 8.

The driven gear shaft 8 is made in the form of a gear shaft with an internal step cavity, a gear ring 9 is made at a larger diameter step. The input shaft 3 of the gearbox is supported by a bearing on the step of the smaller diameter of the gear shaft 8. The gear shaft 8 is installed in a separate housing 10 on bearings aligned with input shaft 3 of the gearbox. Gear shaft 8 through a flange is connected to the drum shaft

The housing 10 is connected to the gear housing by means of fasteners.

The drive gear 4 is mounted on the input shaft 3 of the gearbox with the possibility of axial movement along the splines of the input shaft 3 using the gear shift mechanism.

Three splined sections are made on the input shaft 3 of the gearbox. The two extreme sections have a tooth thickness reduced by 0.4 mm, due to which, when transmitting torque through gear 4, a circumferential shift of its splines relative to the splines of the input shaft 3 of the gearbox by 0.2 mm occurs, which prevents the gear from switching off, a slotted lock is formed.

The swing-type switching mechanism consists of a cracker and a fork with a lever fixed to it with spring pins. The shift lever is fixed in the mechanism of its drive by fixing the swivel bracket with a nut (not shown in the drawing).

In the gearbox there are two limiters 11 of the axial movement of the drive gear 4, which limit the stroke of the fork in extreme positions and thereby prevent the cracker from pressing against the gear 4, excluding its wear.

From rotation, the gearbox is stopped by jet thrust (not shown in the drawing).

When harvesting crops in the gearbox, for the highest frequency of rotation of the threshing drum, direct gear is switched on, for which the drive gear 4 is disconnected from gear 8 using the gear shift mechanism and engaged in gear ring 9 of gear shaft 8. For row crops, the lowering gear is engaged transmission, for which the pinion gear 4 is brought into engagement with the driven gear 5 using the gear shift mechanism. Torque is transmitted from the pinion gear 4 to the pinion gear 5, then to the pinion gear 7 and then m on the gear shaft 8 and on the drum.

The combine drive threshing drum drive reducer can be manufactured on standard equipment using modern technologies and materials.

Claims (1)

Combine threshing drum drive reducer installed between the V-belt pulley and threshing drum and including two pairs of gears located on the shafts, one of which is in constant engagement, and its driven gear is made with an internal gear ring, the switching mechanism, characterized in that the said driven the gear is made in one piece with the input shaft in the form of a pinion shaft, and the drive gear located on the input shaft is installed with the possibility of axial movement, while the input the noy shaft is made with splined sections, the extreme of which are made with a reduced tooth thickness, forming splined locks, in addition, the gearbox is equipped with axial movement limiters of the pinion gear.

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