Adjustable-axle distance roller device

Abstract

The invention discloses an adjustable-axle distance roller device, which comprises a machine frame, a primary roller, a secondary roller, a tire diameter detection device, a roller axle-distance detection and regulation device, a transmission device and a tensioning mechanism. When the device is used, vehicle detection equipment, such as braking detection platforms, chassis dynamometers and speedometer calibration consoles, can realize the automatic adjustment of the axle distance of rollers, the requirements for the longitudinal positioning of tires of different diameters and the adjustment of an adhesive force in a detection process are met, the detection accuracy and efficiency are improved, and the range of vehicles detected is enlarged; a wheel lifting mechanism is not required to be arranged between the primary and secondary rollers; and the adhesive force can be regulated by changing the sum of the supporting forces applied by the rollers onto the wheels in a normal direction so as to realize the simulation of different adhesion coefficients.

Description

technical field [0001] The invention relates to a roller device for vehicle detection equipment, in particular to a roller device with adjustable wheelbase. Background technique [0002] The roller device used to simulate the road surface in the vehicle testing equipment such as vehicle brake testing platform, chassis dynamometer and speedometer calibration platform has two structures: single roller and double roller. The double roller structure is convenient for the longitudinal positioning of the tested vehicle. Wider application. In the current double-drum structure, the main and auxiliary rollers are arranged in parallel and fixedly supported on the frame by bearings. There is no tire diameter detection device, and the distance between the axes of the main and auxiliary rollers (referred to as the roller wheelbase) cannot be automatically adjusted. , so that there are some deficiencies in the corresponding vehicle detection equipment. Mainly manifested in four aspects:...

AI Technical Summary

Problems solved by technology

In the current double-drum structure, the main and auxiliary rollers are arranged in parallel and fixedly supported on the frame by bearings. There is no tire diameter detection device, and the distance between the axes of the main and auxiliary rollers (referred to as the roller wheelbase) cannot be automatically adjusted. , so that there are some deficiencies in the corresponding vehicle detection equipment

Mainly manifested in four aspects: (1) The longitudinal positioning effect of the roller on the vehicle is affected by the tire diameter. The larger the tire diameter, the worse the longitudinal positioning effect. When the tire diameter is greater than a certain value, a special device is required to fix the vehicle longitudinally, reducing In order to improve the detection efficiency, the detected vehicle range is limited by the tire diameter; (2) When the tire diameter is relatively small compared to the wheelbase of the roller, it is easy to cause difficulty in driving the wheel out. For this reason, some detection equipment adds a wheel lifting mechanism between the main and auxiliary rollers (3) The wheelbase of the roller is fixed, and the adhesion between the roller and the wheel mainly depends on the wheel load and the diameter of the tire. The smaller the wheel load or the larger the diameter of the tire, the smaller the sum of the normal support force of the roller to the wheel. The smaller the adhesion between the wheel and the wheel, the easier it is to cause slippage between the wheel and the roller, which reduces the detection accuracy. This phenomenon is especially prominent when the vehicle is unloaded or the wheelbase of the roller is small and the tire diameter is large. People have to make up for it by increasing the wheel load, which makes it inconvenient to use; (4) When it is used for vehicle ABS testing, since the wheelbase of the roller is fixed, the sum of the normal support force of the roller to the wheel remains unchanged, and the distance between the roller and the wheel The adhesive force is also unchanged, and a special adhesion coefficient simulation device must be set up. For example, "an indoor vehicle ABS test bench with variable adhesion coefficient" disclosed in patent CN200710017075.4. Each roller group is equipped with a torque controller separately. The excitation current of the controller changes the wheel braking force when the wheels of the tested vehicle are locked, so as to achieve the purpose of simulating the road adhesion coefficient

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