DE102017212395A1 - Gear arrangement for a commercial vehicle - Google Patents

Abstract

The invention relates to a transmission arrangement for a commercial vehicle, which is rotatably driven via a drive shaft 4 of a vehicle engine 5 and designed as a multi-splitter load switching group 1, one of the power shift group 1 downstream synchronous gear part 2 and a power shift group 3 to reverse the direction of rotation and an output shaft 10 from which a first final drive 11 is drivable. The load switching group 1 is the power switchable turning group 3 upstream, the direction reversal is load flow interruption free. The load shift group 1 consists of at least six forward gears rotating in one direction of rotation. The synchronous gear part 2 has a plurality of synchronous lengths 7, 8, 9, one of which is a directly driven synchronous gear 7.

Description

The invention relates to a transmission arrangement for a commercial vehicle, which is rotatably driven by a vehicle engine via a drive shaft and a multiple-splitter load switching group, a power shift group downstream synchronous gear and a power shift group for reversing the direction of rotation and an output shaft, driven by a first final drive is.

In known powershift transmissions, a 4-way splitter with 5 to 6 sync lengths or a 6-way splitter with 4 to 5 sync speeds is combined. The more power-shiftable synchronous length the transmission arrangement has, the more frequently the load flow of the commercial vehicle, which is preferably an agricultural utility vehicle, is interrupted during acceleration. During field work, this slows down the agricultural utility vehicle during the shifting process and therefore has to make up for the lost speed in an unfavorable gear. For heavy field work, a non-power shift synchronous gear shift is not possible because the agricultural vehicle would come to a standstill immediately. In general, the switching of a non-load switchable synchronous gear is always more uncomfortable than the switching of a load shift gear.

The object of the invention is to provide a gear arrangement for a commercial vehicle, which has an improved efficiency.

This object is achieved in that the power shift group upstream of the power shift group is reversible, the direction reversal is load flow interruption free, that the load switching group consists of at least six rotating in one direction forward gears and that the Synchrongangteil has a plurality of synchronous gear, of which one gear is a directly durchgeschiebener synchronous gear ,

The commercial vehicle is preferably an agricultural utility vehicle.

The increased number of forward gears of the power shift group while increasing the gear spread, the number of synchronous gears can be reduced while the speed profile can be better adapted to the work areas, as a high number of forward gears for each synchronous gear is available. The reduction of the synchronous length leads to a reduction of costs and design effort.

This design allows the load shift group itself a load flow interruption-free switching their forward gears in one direction.

The turning group, which is arranged in front of the load shift group, allows a load flow interruption-free rotation reversal both at standstill of the gear assembly and during a ride of the commercial vehicle.

Since the turning group only needs to be designed for the maximum torque of the vehicle engine and possibly the starting torque, it can be made relatively small.

For synchronous gear change, the load flow must be interrupted, for which purpose the output-side clutches of the load-shift group are opened.

From the output shaft, a second final drive can be driven, which can serve as a front-wheel drive, while the first final drive can be a rear-wheel drive.

The directly driven synchronizing gear can be located in a main working area of the gearbox arrangement.

Here, the gear ratios can be designed so that this directly driven, efficient gear covers the entire main work area of the gear assembly and the commercial vehicle.

An output of the synchronizing gear can be preceded by a creeper gear. As a result, the forward gears can be downsized again. This results in more gear combinations, so that the application of the gear assembly and the commercial vehicle is further expanded.

The power shift group may have nine forward gears and the synchong portion three synchroong.

As a result, 27 forward gears (9 × 3) and also 27 reverse gears are achieved.

An embodiment of the invention is illustrated in the drawing and will be described in more detail below. The single figure shows a schematic diagram of a transmission arrangement.

The illustrated gear assembly is for use with a utility vehicle, particularly an agricultural utility vehicle, such as a utility vehicle. a tractor or the like.

The gear arrangement has a power shift group 3 on.

This power shift group 3 is a load switching group 1 downstream, which in turn is a synchronous part 2 is subordinate.

A drive shaft 4 the power shift group 3 is powered by a vehicle engine 5 rotatably driven. This is the entrance 12 and the output shaft 13 the turning group 3 parallel to each other, so that the turning group 3 indirectly driven

From the exit 13 the turning group 3 is the 9-speed power shift group 1 executed power shift group 1 driven by the nine powershift forward gears can be realized.

From the exit 6 the load shift group 1 becomes the synchronous gear part having three synchronous length 2 driven, the second synchronous gear 7 is a directly driven synchronizer gear used for the main work area of the gear train. The first sync song 8th and the third synchronous gear 9 are driven through indirectly.

The exit 10 the synchronous gear part 2 drives a bevel gear of a first final drive 11 , preferably the Hinterachsantriebs of the commercial vehicle.

From the second synchronous gear 7 the turning group 3 a branch goes to a second final drive 14 , Preferably the Vorderachsantriebs of the commercial vehicle, so that a four-wheel drive is possible.

In the illustrated embodiments of the gear arrangement arise both for the forward drive and for the reverse drive of the commercial vehicle 9 × 3 speed steps. The nine powershift gearshifts of the power shift group 1 are load-switchable for each of the three synchronous switching stages.

LIST OF REFERENCE NUMBERS

1

Powershift Group

2

Synchro drive part

3

turning group

4

drive shaft

5

vehicle engine

6

Output load switching group

7

second synchronous gear

8th

first synchongang

9

third synchronous gear

10

Output synchronous gear part

11

first final drive

12

Entrance turning group

13

Output shaft turning group

14

second final drive

Claims (6)

Transmission arrangement for a commercial vehicle, which is rotatably driven by a vehicle engine (5) via a drive shaft (4) and a power shift group (1) designed as a multiple splitter, a synchronous gear part (2) arranged downstream of the power shift group (1) and a power shift group (3) Direction of rotation reversal and an output shaft (10) from which a first final drive (11) is driven, characterized in that the load switching group (1) is upstream of the powershiftable turning group (3) whose direction of rotation reversal load flow interruption free, that the load switching group (1) off at least six forward gears rotating in a rotational direction, and that the synchronous gear member (2) has a plurality of synchronous gears (7, 8, 9), one of which is a directly driven synchronous gear (7). Gear arrangement according to Claim 1 , characterized in that the directly driven synchronous gear (7) lies in a main working range of the gear arrangement. Gear arrangement according to one of the preceding claims, characterized in that from the output shaft of the synchronous gear part (2), a second axle drive (14) is drivable. Gear arrangement according to one of the preceding claims, characterized in that an output of the synchronizing gear part is preceded by a creeper gear group. Gear arrangement according to one of the preceding claims, characterized in that the load shift group (1) has nine forward gears. Gear arrangement according to one of the preceding claims, characterized in that the synchronous gear part (2) has three synchronous length (7, 8, 9).

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