Method of testing shock absorption of a spring running gear, particularly undercarriage of a road motor vehicle with elastic tires and apparatus for performing the method

Claim 3

A method according to claim 1, wherein the maximum energizing frequency is chosen at least one and a half times higher than the natural frequency (ω) of the running gear.

Claim 4

Apparatus for testing of shock absorption of a spring running gear, particularly undercarriage of a road motor vehicle with elastic tires comprising: a support plate constituting a wheel supporting surface; energizing means connected to said support plate through intermediate means; at least one force sensing unit connected to an electronic measuring unit and to the intermediate means, wherein the energizing means is provided with wedging means (2) driven by a crank mechanism (3) and mounted between upper operating surfaces (1 A ) formed on the bottom of the support plate (1) and lower operating surfaces (4 A ) formed on the intermediate means developed as a two-support beam (4), and the upper and/or lower of the operating surfaces (1 A , 4 A resp.) include a bevel (α) to the horizontal, and one of the supports of the two-support beam (4) is constituted by the at least one force sensing unit (5).

Claim 5

Apparatus for testing of shock absorption of a spring running gear, particularly undercarriage of a road motor vehicle with elastic tires comprising: a support plate constituting a wheel supporting surface; energizing means connected to said support plate through intermediate means; at least one force sensing unit connected to an electronic measuring unit and to the intermediate means, wherein the energizing means is provided with wedging means (2) driven by a crank mechanism (3) and mounted between upper operating surfaces (1 A ) formed on the bottom of the support plate (1) and lower operating surfaces (4 A ) formed on the intermediate means developed as a two-support beam (4), and the upper and/or lower of the operating surfaces (1 A , 4 A resp.) include a bevel (α) to the horizontal, and one of the supports of the two-support beam (4) is constituted by the at least one force sensing unit (5).

Claim 6

Apparatus according to claim 3, wherein the wedging means (2) are mounted on needle-roller bearings.

Claim 7

Apparatus according to claim 3, wherein the other support of the two-support beam (4) is formed as a suspension joint (9) around which the two-support beam (4) can be tilted up.

Claim 8

Apparatus according to claim 3, wherein said at least one force sensing unit is a first and second force sensing units, said electronic measuring unit is formed as a measuring/evaluating unit (E) having two pre-amplifiers (13, 14), one said pre-amplifier being connected to said first force sensing unit and the other said pre-amplifier being connected to said second force sensing unit (5), the output of each pre-amplifier (13 and 14 resp.) is connected in shunt to an input of a d.c. amplifier/integrator (16) and an input of an a.c. amplifier (17) through a side selector switch (15), the d.c. amplifier/integrator (16), an adder (18), a divider (19) and a digital voltmeter (20) are connected in series, the a.c. amplifier (17), a peak rectifier (21) and a further adder (22) are connected in series as well, an output of the peak rectifier (21) is also connected to an input of a sample-and-hold amplifier (23), an output of which is connected to another input of the adder (18), the peak rectifier (21) is bidirectionally connected to a unit (24) for automatic erasing, controlling and side selecting and one output of the unit (24) is connected to a motor switch (25) and a second output of the unit (24) is connected to a generator (26) which generates sampling impulses, the generator (26) has an output connected to another input of the sample-and-hold amplifier (23), further an output of the adder 22 is connected to a further input of the divider (19) and another input of the adder (22) is connected to the output of the d.c. amplifier/integrator (16) and an output of the digital voltmeter (20) is connected to a digital readout (27) and a digital interface (28), respectively to drive a digital printer.