Adjustable test piece receptacle for a driveline test bench and driveline test bench

Abstract

The invention relates to an adjustable test piece receptacle (1) for a driveline test bench (100), wherein the test piece receptacle (1) has a first face (5) and a second face (3) parallel to the first face (5), wherein the test piece receptacle (1) can be arranged on a base by means of the first face (5), wherein a test piece can be arranged on the second face (3), and wherein the test piece receptacle (1) is designed such that the second face (3) can be adjusted relative to the first face (5) along a longitudinal axis (X), a height axis (Z) and a transverse axis (Y). The test piece receptacle (1) according to the invention is characterized in that the test piece receptacle (1) is further designed such that the second face (3) can be flipped relative to the first face (5) at least about the height axis (Z) and the transverse axis (Y). The invention furthermore relates to a corresponding driveline test bench (100).

Description

Technical Field

[0001] The present invention relates to an adjustable specimen receiving portion for a transmission system test bench, and to a corresponding transmission system test bench. Background Technology

[0002] Transmission test benches or drivetrain test benches for testing motor vehicle transmissions or the entire motor vehicle powertrain are known from the prior art. Such test benches are typically used to identify functional faults in the drivetrain early through a series of load tests. Furthermore, such test benches are also used in the development and continuous improvement of motor vehicle powertrains, and particularly motor vehicle transmissions. Generally, known test benches are designed for testing internal combustion engine driven motor vehicle powertrains.

[0003] Test benches suitable for testing internal combustion engine-driven vehicle transmissions are typically unsuitable for testing electric transmissions, as these are driven at significantly higher speeds exceeding 10,000 rpm. Therefore, test benches for electric drive systems in motor vehicles have particular requirements regarding stiffness and vibration damping. Furthermore, due to the high speeds, the electric transmission must be oriented very precisely within the test bench.

[0004] In this regard, DE 10 2016 224 142 A1 describes a modularly constructible powertrain test bench for electric motor vehicle drives, designed to be particularly robust and vibration-damped. Simultaneously, the test bench allows for precise orientation of the transmission relative to the drive unit of the test bench.

[0005] However, known test benches for motor vehicle electric drive systems have the disadvantage that they require a high time cost to calibrate the test bench for each drive system to be tested. Summary of the Invention

[0006] Therefore, the objective of this invention is to propose an improved specimen receiving portion for a transmission system test bench.

[0007] This task is solved according to the invention by an adjustable specimen receiving portion for a transmission test bench according to the invention.

[0008] This invention relates to an adjustable specimen receiver for a transmission system test bench, wherein the specimen receiver has a first surface and a second surface parallel to the first surface, wherein the specimen receiver is disposed on a bottom via the first surface, wherein a specimen can be disposed on the second surface, and wherein the specimen receiver is designed such that the second surface is adjustable relative to the first surface along a longitudinal axis, a height axis, and a lateral axis. A feature of the specimen receiver according to the invention is that the specimen receiver is further designed such that the second surface is flip-up relative to the first surface at least about a height axis and a lateral axis.

[0009] Therefore, a specimen housing is provided, suitable as part of a transmission test bench to house specimens. The specimen is preferably a vehicle transmission, particularly a transmission for an electrically driven vehicle. The main difference between such a transmission for an electrically driven vehicle and one for an internal combustion engine-driven vehicle lies in its significantly higher input speed, exceeding 10,000 rpm. Furthermore, transmissions for electrically driven vehicles typically have relatively few shiftable gears. The specimen is not limited to a vehicle transmission, but can be, for example, a vehicle transmission with an output shaft and transfer case connected to the individual wheel drive axles. It is also conceivable and preferred that the specimen be simply an electric drive motor for an electrically driven vehicle. In this case, the electric drive motor can be specifically subjected to a so-called "back-to-back" test, i.e., a load test, in which the electric drive motor for the electrically driven vehicle is directly connected to the drive unit of the transmission test bench. The drive unit of the transmission test bench is also, in particular, an electric motor. Because the clutch is advantageously used as the connecting element between the specimen and the drive unit of the transmission test bench, it is required that the specimen be oriented as precisely as possible relative to the drive unit. The clutch is advantageously suited for transmitting high speeds, such as those typically found in electric transmissions, but requires unbiased orientation of the shaft to be connected. To ensure this precise orientation, in addition to the adjustability of the second face relative to the first face along the longitudinal, height, and transverse axes, the invention also specifies the reversibility of the second face relative to the first face about the height and transverse axes. Therefore, a largely optimal orientation of the specimen can be reliably and easily ensured. In particular, undesirable vibrations due to insufficient orientation can thus be avoided.

[0010] The first and second surfaces of the specimen receiving portion are preferably designed to be metallic and substantially flat. The first and second surfaces may have slits or openings, or they may have large open areas. The first surface forms the lower side of the specimen receiving portion, on which the specimen receiving portion can be placed. The slits or openings in the first surface are advantageously configured to facilitate the fastening of the specimen receiving portion to the base. Relatively large open areas are also preferred, for example, for weight reduction. The second surface forms the upper side of the specimen receiving portion, on which the specimen can be arranged. Advantageously, multiple retainers, particularly four retainers, can be arranged through the slits or openings in the second surface for clamping the specimen. The first and second surfaces are preferably designed to be rectangular.

[0011] The longitudinal axis, the height axis, and the transverse axis are three mutually orthogonal axes. The longitudinal axis defines the direction along the long side of the first surface, the transverse axis defines the direction along the short side of the first surface, and the height axis is perpendicular to the first surface.

[0012] According to a preferred embodiment of the invention, the second surface can be adjusted relative to the first surface along the height axis by means of at least two movable wedges. The at least two wedges are preferably designed to be identical. The two wedges have a triangular cross-section and two long sides and one short side. The primary advantage obtained is that the first and second surfaces are thus connected to each other by the at least two wedges, achieved by having the first surface abut against one of the long sides of each wedge and the second surface abut against the other long side of each wedge. This relatively large abutment surface results in a vibration-damped and robust connection between the first and second surfaces.

[0013] Each wedge can preferably move along the first or second surface via a lead screw thread, particularly along the ramp of the first or second surface, such that the movement of the first surface relative to the second surface along the height axis is obtained depending on the positioning of the wedge. Through the movement of the wedge, relatively fine height adjustment of the second surface relative to the first surface is thus achieved in a simple manner. In particular, it is not necessary to use shims to set the desired height of the second surface relative to the first surface, as is often the case in the prior art.

[0014] According to another preferred embodiment of the invention, at least two wedge-shaped members are arranged on the first intermediate plate, wherein, in particular, the first intermediate plate has a slope on its upper side that corresponds opposite to the slope of the wedge-shaped members, such that the lower side of the first intermediate plate and one long side of each of the at least two wedge-shaped members are parallel to each other. An advantage of this design of the first intermediate plate is that it does not impede the possibility of adjustment or flipping of the second surface relative to the first surface along a separate axis.

[0015] According to another preferred embodiment of the invention, at least two movable wedges are arranged against relative movement on a first or second surface and are movable on a ramp provided thereon on another surface, such that the movement of the at least two wedges simultaneously causes adjustment of the first surface along the height axis and along the transverse or longitudinal axis. By arranging the at least two wedges against relative movement on the first or second surface, the first or second surface moves correspondingly with the at least two wedges. This results in movement along the ramp by the at least two wedges, achieving not only movement along the height axis but also movement along the transverse or longitudinal axis.

[0016] According to another particularly preferred embodiment of the invention, at least two wedges each have a raised portion extending along their side facing the second face. The raised portion can, for example, be designed with an arcuate cross-section and extend over the entire length or a portion of the side of the respective wedge. The advantage of this is that the second face is not connected to each of the at least two wedges by two mutually abutting surfaces, but rather by a contact line along which two surfaces abut against each of the at least two wedges. It is also conceivable that the raised portion extends interruptedly along the side of the respective wedge facing the second face; in particular, the raised portion can even be a spherical protrusion. Therefore, for example, a slight misalignment of the wedge's orientation relative to the second face that occurs during movement of one or more wedges can be compensated for on the corresponding wedge.

[0017] According to another particularly preferred embodiment of the invention, the positioning of at least two wedges can be detected by means of at least one depth gauge. Therefore, the positioning of at least two wedges can be detected in a simple manner. The movement of the second face relative to the first face along the height axis is represented by the positioning of the wedges, thus the height of the second face relative to the first face can also be determined in a simple manner.

[0018] Preferably, each wedge has its own depth gauge.

[0019] According to another preferred embodiment of the invention, the second surface is adjustable relative to the first surface along a longitudinal axis via a longitudinal lead screw drive mechanism, and the second surface is adjustable relative to the first surface along a transverse axis via a transverse lead screw drive mechanism. The lead screw drive mechanisms allow for precise and reliable movement of the second surface relative to the first surface. The longitudinal lead screw drive mechanism can be arranged, for example, along a longitudinal axis between the first and second surfaces, while the transverse lead screw drive mechanism can be arranged, for example, along a transverse axis between the first and second surfaces.

[0020] According to another preferred embodiment of the invention, the second surface is capable of being flipped about a transverse axis relative to the first surface by means of at least one of the at least two wedges. For this purpose, only one of the at least two wedges moves, or the at least two wedges move to different degrees, such that different gaps are created between the wedges and the second surface, and the second surface is correspondingly inclined relative to the first surface. If the at least two wedges are arranged with a gap between them along the transverse axis and are movable, then the flipping of the second surface along the transverse axis can therefore be achieved.

[0021] According to another preferred embodiment of the invention, the second face can be rotated relative to the first face about a support point and about a height axis via a tilting screw drive mechanism. The tilting screw drive mechanism can, for example, be arranged at the longitudinal end of the specimen receiving portion. By adjusting the tilting screw drive mechanism, the first face can be rotated about a height axis, wherein the rotation point is the support point.

[0022] According to a particularly preferred embodiment of the invention, the support point is provided as a swivel support between the first surface and the second intermediate plate, or between the second surface and the second intermediate plate. An advantage of designing the second intermediate plate is that it does not impede the possibility of adjusting or flipping the second surface relative to the first surface along a different axis.

[0023] According to a particularly preferred embodiment of the invention, the support point is arranged within the outer quarter of the length of the specimen receiving portion. Since the support point is the point of rotation of the first surface around it, the point of rotation is also correspondingly located within the outer quarter of the length of the specimen receiving portion.

[0024] Preferably, the support point is located within the outer quarter of the length of the specimen receiving portion, away from the reversing screw drive mechanism. This means that the specimen receiving portion is divided into four imaginary quarters in the longitudinal or transverse direction, with the support point located within the outer quarter. This quarter is away from another outer quarter on which the reversing screw drive mechanism is located. The advantage of this is that, through the different length ratios of the specimen receiving portion around the support point, i.e., through the switching of the rotating arm, a particularly sensitive torsion on the side of the second face away from the reversing screw drive mechanism is achieved.

[0025] According to another preferred embodiment of the invention, the pre-set orientation of the second surface relative to the first surface can be fixed by clamping screws. Therefore, it can be ensured, particularly during operation of the transmission test bench, that the orientation of the specimen receiving portion does not undesirably change due to vibrations or applied forces.

[0026] According to another preferred embodiment of the invention, the specimen receiving portion further includes a base, on which a first surface is arranged to resist relative movement and relative tilting. The base here achieves the arrangement of the specimen receiving portion at a height substantially suitable for the transmission test bench. Advantageously, the base is made of a relatively robust, heavy, and vibration-damping material, particularly of a mineral casting very well suited for vibration damping.

[0027] The present invention also relates to a drivetrain test bench for testing vehicle electric drives, the drivetrain test bench including a specimen receiving portion according to the invention. Therefore, the advantages already described in conjunction with the specimen receiving portion according to the invention are also suitable for the drivetrain test bench according to the invention. Attached Figure Description

[0028] The invention is explained exemplarily below with reference to embodiments shown in the accompanying drawings.

[0029] in:

[0030] Figure 1 Exemplary and schematic illustrations show possible embodiments of the transmission test bench according to the present invention.

[0031] Figure 2a -d Exemplarily and schematically illustrates a possible embodiment of the specimen receiving portion according to the present invention.

[0032] Figure 3 Another possible embodiment of the specimen receiving portion according to the invention is illustrated by way of example, and

[0033] Figure 4 A cross-section of a possible embodiment of the raised portion is shown, exemplarily and schematically, on the side of the wedge-shaped member facing the second surface 3.

[0034] Identical objects, functional units, and comparable components are designated by the same reference numerals in the various figures. These objects, functional units, and comparable components are implemented identically in terms of their technical features, provided that they are not expressed differently from the description, either implicitly or explicitly. Detailed Implementation

[0035] Figure 1 A possible embodiment of the transmission system test bench 100 according to the present invention is illustrated exemplaryly and schematically. The transmission system test bench 100 includes, for example, a drive module 50 and a specimen receiving portion 1 according to the present invention. The drive module 50 is included herein. Figure 1 An electric motor, not shown, can be driven via flange 51. Figure 1 The specimen is not shown in the diagram. The specimen housing 1 and the drive module 50 are interconnected via a common base, thereby achieving a particularly robust and vibration-damping connection. For example, the base is made of mineral casting. Furthermore, the specimen housing 1 includes a first surface 5 and a second surface 3, which are respectively made of steel, and... Figure 1 The specimens are arranged in parallel and stacked configurations. The first surface 5 is located below the specimen receiving section 1 and is arranged on the base in a manner resistant to relative movement and flipping. Multiple specimens can be arranged through the various slits and openings in the second surface 3. Figure 1 A retaining element (not shown) is used to clamp the specimen onto the second surface 3. The specimen receiving portion 1 is designed such that the second surface 3 can be adjusted relative to the first surface 5 not only along the longitudinal axis X, the height axis Z, and the transverse axis Y, but also rotated relative to the first surface 5 about the height axis and the transverse axis. Different axes and directions of rotation are... Figure 1The diagram is illustrated by arrows X, Y, Z, B, and C, where B represents rotation about the lateral axis Y and C represents rotation about the height axis Z.

[0036] Figure 2a -d Exemplarily and schematically illustrates a possible embodiment of the specimen receiving portion 1 according to the invention. Figure 2a The fully installed specimen receiving section can be seen, which includes a first surface 5, a second surface 3, a first intermediate plate 4, a second intermediate plate 2, and two wedge-shaped members 6 and 6'. Figure 2a The middle wedge-shaped parts 6 and 6' are obscured by the second surface 3. Figure 2b Only the first surface 2 and two wedges 6 and 6' held on the first surface 2 by screws are shown. Because the screws are guided through the longitudinal slits of the wedges 6 and 6', the wedges 6 and 6' can move along the transverse axis Y, respectively. Figure 2c The diagram also shows a first surface 5 and a first intermediate plate 4. As can be seen, a second intermediate plate 2 is arranged on the first surface 5. The first intermediate plate 4 spaces the wedges 6, 6' from the second intermediate plate 2 without impeding the mobility of the wedges 6, 6'. The wedges 6, 6' can move on the surface of the first intermediate plate 4 according to the size of the longitudinal slits within them. The second surface 3 is arranged on the wedges 6, 6', similarly without restricting their mobility. Due to the wedge shape of the wedges 6, 6', the distance between the second intermediate plate 2 and the second surface 3 increases depending on how far the wedges 6, 6' move. The second surface 3 is therefore adjusted relative to the first surface 5 along the height axis Z. Figure 2d Finally, a view of the specimen receiving section 1 is shown from below. Depending on the selected view, only the first surface 5 and the second intermediate plate 2 are visible.

[0037] Figure 3 Another possible embodiment of the specimen receiving portion 1 according to the present invention is illustrated by way of example. In this case, the specimen receiving portion 1 also includes a first surface 5, a second surface 3, a first intermediate plate 4, a second intermediate plate 2, and two wedge-shaped members 6, 6', wherein the wedge-shaped members 6, 6' are further obscured by the second surface 3. Figure 3A magnified detailed view shows a flipping screw drive mechanism 7 for flipping the second surface 3 relative to the first surface 5 about a support point 8 and about the height axis Z via a second intermediate plate 2, wherein the support point 8 is arranged in the outer quarter of the longitudinal direction of the specimen receiving portion 1, away from the flipping screw drive mechanism 7. Also visible is a longitudinal screw drive mechanism 9 for adjusting the second surface 3 relative to the first surface 5 along the longitudinal axis X via the second intermediate plate 2. A transverse screw drive mechanism 10 enables adjustment of the second surface 3 relative to the second surface 5 along the transverse axis Y via the first intermediate plate 4. Two wedges 6 and 6' can move along the transverse axis Y via a two-wedge screw drive mechanism 11, causing the second surface 3 to move relative to the first surface 5 along the height axis Z. By moving only one wedge 6 or 6' along the transverse axis Y, the second surface 3 can be flipped relative to the first surface 5 about the transverse axis Y. The flipping orientation of the second surface 3 relative to the first surface 5 about the height axis Z can be determined by a positioning indicator 12. The coordinate indicator 13 ultimately supports the operator of the specimen receiving section 1 during calibration. This is achieved by interpreting the individual coordinate axes with the coordinate indicator and thus simplifying the association between the lead screw drives 7, 9, 10, 11 and the adjustment along or around a defined axis.

[0038] Figure 4 A cross-section of a possible embodiment of the raised portion 14 is shown, exemplarily and schematically, on the side of the wedge 6 facing the second surface 3, and extending at least partially along the length of the side. The raised portion 14 provides a narrow contact line between the wedge 6 and the second surface 3, and furthermore, even in the event of accidental and only slight lateral twisting or deflection of the wedge 6, the orientation of the second surface does not change.

[0039] List of icon numbers

[0040] 1. Specimen Receiving Section

[0041] 2 Second intermediate plate

[0042] 3. Second page

[0043] 4 First intermediate plate

[0044] 5 First page

[0045] 6, 6' wedge-shaped piece

[0046] 7. Tilting screw transmission mechanism

[0047] 8 Support points

[0048] 9. Longitudinal lead screw transmission mechanism

[0049] 10. Horizontal lead screw transmission mechanism

[0050] 11. Wedge-shaped lead screw transmission mechanism

[0051] 12 Positioning Indicators

[0052] 13 Coordinate Indicators

[0053] 14. Raised section

[0054] 50 Driver Modules

[0055] 51 Flange

[0056] 100 Transmission System Test Bench

[0057] X longitudinal axis

[0058] Y-axis

[0059] Z-axis height

[0060] B. Rotation about the transverse axis

[0061] C Rotation around the height axis

Claims

1. An adjustable specimen receiving part (1) for a transmission system test bench (100), wherein, The specimen receiving portion (1) has a first surface (5) and a second surface (3) parallel to the first surface (5), wherein the specimen receiving portion (1) can be arranged on the bottom via the first surface (5), wherein a specimen can be arranged on the second surface (3), and wherein the specimen receiving portion (1) is designed such that the second surface (3) can be adjusted relative to the first surface (5) along the longitudinal axis (X), the height axis (Z), and the transverse axis (Y). The specimen receiving portion (1) is characterized in that the second surface (3) is designed to be able to rotate relative to the first surface (5) at least about the height axis (Z) and the transverse axis (Y), wherein the second surface (3) is adjustable relative to the first surface (5) along the height axis (Z) by means of at least two movable wedges (6, 6').

2. The specimen receiving portion (1) according to claim 1. Its features are, At least two movable wedges (6, 6') are arranged against relative movement on the first surface (5) and can move on the second surface (3) on a ramp provided therefor, or are arranged against relative movement on the second surface (3) and can move on the first surface (5) on a ramp provided therefor, such that the movement of the at least two wedges (6, 6') simultaneously causes the first surface (5) to adjust along the height axis (Z) and along the transverse axis (Y) or the longitudinal axis (X).

3. The specimen receiving portion (1) according to claim 1. Its features are, At least two wedges (6, 6') are arranged on the first intermediate plate (4).

4. The specimen receiving portion (1) according to claim 1. Its features are, At least two wedge-shaped pieces (6, 6') each have a raised portion (14) extending on the side facing the second surface (3).

5. The specimen receiving portion (1) according to claim 1, Its features are, The positioning of at least two wedges (6, 6') can be detected by using at least one depth gauge.

6. The specimen receiving portion (1) according to any one of claims 1 to 5. Its features are, With the aid of the longitudinal lead screw drive mechanism (9), the second surface (3) can be adjusted relative to the first surface (5) along the longitudinal axis (X), and with the aid of the transverse lead screw drive mechanism (10), the second surface (3) can be adjusted relative to the first surface (5) along the transverse axis (Y).

7. The specimen receiving portion (1) according to any one of claims 1 to 5. Its features are, With the aid of at least one of the two wedges (6, 6'), the second face (3) can be flipped relative to the first face (5) about the transverse axis (Y).

8. The specimen receiving portion (1) according to any one of claims 1 to 5. Its features are, With the aid of the flip screw drive mechanism (7), the second face (3) can be flipped relative to the first face (5) around the support point (8) and around the height axis (Z).

9. The specimen receiving portion (1) according to claim 8. Its features are, The support point (8) is configured as a rotary support between the first surface (5) and the second intermediate plate (2) or a rotary support between the second surface (3) and the second intermediate plate (2).

10. The specimen receiving portion (1) according to claim 8. Its features are, The support point (8) is located within the outer quarter of the length of the specimen receiving part (1).

11. The specimen receiving portion (1) according to any one of claims 1 to 5. Its features are, The second surface (3) can be fixed in a predetermined orientation relative to the first surface (5) by means of clamping screws.

12. The specimen receiving portion (1) according to any one of claims 1 to 5. Its features are, The specimen receiving portion (1) further includes a base, on which the first surface (5) is arranged to resist relative movement and relative flipping.

13. The specimen receiving portion (1) according to claim 3. Its features are, The first intermediate plate (4) has a slope on its upper side that corresponds to the slope of the wedge (6, 6') in the opposite direction, such that the lower side of the first intermediate plate (4) and one long side of each of the at least two wedges (6, 6') are parallel to each other.

14. A drivetrain test bench (100) for testing electric drive systems of vehicles, the drivetrain test bench (100) comprising a specimen receiving portion (1) according to any one of claims 1 to 13.

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