DE102013104175B4 - Gear unit for test bench arrangement - Google Patents

Abstract

Test bench arrangement for investigating the operating states of internal combustion engines (BKM) with two dynamometers (BM1, BM2) and a gear unit (GE), characterized in that each of the dynamometers (BM1, BM2) has a bevel gear (14, 15), each with one with each one of the bevel gears (14, 15) cooperating face gear (7, 8) can be coupled, wherein the face gears (7, 8) can each be engaged separately with a spur gear (4, 5), and wherein the spur gears (4, 5 ) are in engagement with a driven gear (1) for power transmission to the crankshaft of the internal combustion engine (BKM).

Description

The invention relates to a test stand arrangement for examining the operating states of internal combustion engines with two dynamometers and a transmission unit.

A large number of test stand arrangements are known from the prior art for examining operating states and different operating conditions of internal combustion engines in motor vehicles. The solutions that have become known are mainly about the simple structure and the great variability, with particular attention being paid to the question of the width of the transmission ratios. For example, from the DE 1 259 164 B a test bench arrangement with two loading machines is known, which solves the problem with several clutch devices, which is intended to cause the connection of two transmissions.

The DE 30 48 411 C2 shows a modularly convertible transmission unit for test benches. In particular, for the measurement and adjustment of pumps, for example, is from the DE 31 11 939 C2 a transmission unit for a test stand is known, in which a displacement device is used to couple or uncouple different output shafts.

In the DE 197 51 452 A1 , which also shows a test facility with two dynamometers arranged parallel to one another, the frequency of the two dynamometers is changed electronically separately from one another in order to test the machine to be examined, in particular with regard to the torsional vibrations emanating from it. The DE 195 37 639 A1 shows another test stand arrangement with two load machines and a gear unit; The loading machines are connected in parallel and can be regulated differently and separately from one another.

The DE 100 25 095 A1 describes a test bench for internal combustion engines with a dynamometer and a transmission unit; The transmission is connected directly to the crankshaft of the internal combustion engine on the input side and to the dynamometer on the output side via a cardan shaft, so that internal combustion engines installed both longitudinally and transversely in the motor vehicle can be tested without major conversion work on the test bench.

The invention is based on the object of proposing a simply constructed transmission unit for a test stand arrangement with two load machines, which allows the greatest possible variability with regard to the operating states to be tested and the possible operating conditions of an internal combustion engine or a vehicle.

This object is achieved according to the invention in that each of the loading machines is in mesh with a face gear interacting with the bevel gear via a bevel gear, wherein the face gears can each be brought into mesh separately with a spur gear each, and the spur gears in turn with the output gear are engaged for power transmission to the crankshaft of the internal combustion engine.

The spur gears are preferably rotatably mounted on a common axis.

From the above, it is self-explanatory for the person skilled in the art that with a transmission unit constructed in this way, in addition to a large range of transmission ratios, a large variability of the load states for the internal combustion engine can be handled.

The above-described and other features, advantages and advantageous configurations of the subject matter of the invention are described in more detail below with reference to the schematic representation of exemplary embodiments in the attached drawing.

• 1 den schematischen Aufbau der Prüfstandsanordnung nach der Erfindung incl. Getriebeeinheit;
• 2 den schematisch dargestellten Kraftfluss der Getriebeeinheit gem. 1; und
• 3 das Schema nach 1 bzw. 2 mit separat regelbaren Belastungsmaschinen.

It shows:

• 1 the schematic structure of the test bench arrangement according to the invention including gear unit;
• 2 the power flow of the transmission unit shown schematically according to. 1 ; and
• 3 the scheme 1 or. 2 with separately controllable loading machines.

In the schematic representation of a test bench is in 1 the internal combustion engine BKM is shown in phantom, the crankshaft (not shown) of which is coupled to an output gear wheel 1 of a transmission unit GE. The spur gears 4 and 5, which are rotatably mounted in the transmission unit GE, can be brought into engagement with the teeth 2 and 3 of the driven gear wheel 1, respectively.

These spur gears 4 and 5 are each to be brought into engagement with the teeth 2 and 3 of the output gear 1 via their spur gearing. The spur gears 4 and 5 are also in engagement with their spur gears with the spur gears of the face gear 7 and 8. Face gear 7 and face gear 8 are mounted on a common drive axle 10 in the transmission unit GE.

The face gears 7 and 8 are on their mutually projecting flanks with bevel gears 12 and 13, respectively, which mesh with bevel gears 14 and 15, respectively.

The bevel gears 14 and 15 are of loading machines BM1 and BM2 (not shown - see 2 and 3 ) driven. These loading machines BM1 and BM2 can be electric motors controlled independently and/or in parallel.

The options for influencing the simulation of operating conditions of internal combustion engines in a transmission unit GE constructed according to the invention are obvious to a person skilled in the art: the independent regulation of the dynamometers BM1, BM2. This ensures that the gears of the GE gear unit are not exposed to changing torques or a changing torque curve (positive and negative torque around the zero position), thus minimizing wear and reducing noise.

Schematically this power flow is in 2 shown. The 2 a different structure only for a better representation of the power flow. Stress-free power transmission takes place via the parallel-connected dynamometers BM1 and BM2 from the dynamometers to the internal combustion engine BKM with variability over the speed. If the dynamometers BM1 and BM2 are not controlled in parallel (different torques are applied), tension can be brought about in the gear unit GE (different force curves shown in dashed lines).

Claims (3)

Test bench arrangement for investigating the operating states of internal combustion engines (BKM) with two dynamometers (BM1, BM2) and a gear unit (GE), characterized in that each of the dynamometers (BM1, BM2) has a bevel gear (14, 15), each with one with each one of the bevel gears (14, 15) cooperating face gear (7, 8) can be coupled, wherein the face gears (7, 8) can each be engaged separately with a spur gear (4, 5), and wherein the spur gears (4, 5 ) are in engagement with a driven gear (1) for power transmission to the crankshaft of the internal combustion engine (BKM). test bench arrangement claim 1 , characterized in that the face gears (7) and (8) are rotatably mounted on a common axis (9) in the gear unit (GE). test bench arrangement claim 1 , characterized in that the spur gears (4) and (5) are rotatably mounted on a common axis (6) in the transmission unit (GE).

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