RU2758732C1 - Car mounting device on dynamic stand with running drums - Google Patents

Abstract

FIELD: automobile industry.SUBSTANCE: device contains a car mounted on running drums, equipped with towing hooks in front and behind, the spatial movement of which is limited by holding flexible elements, laid with the possibility of longitudinal movement through fastening devices in the form of vertical posts on the winding drums of winches mounted under the floor of the stand. The flexible element in the vicinity of the vertical post placement area is equipped with a tightening mechanism containing a clamping unit and an elastic element. The clamping unit, formed with the ability to move along the flexible element, is made including a housing provided with guide rollers holding the flexible element in the cavity of the housing, a clamp located in the housing, by means of a hinge connection, connected to the aforementioned housing and to a holder designed to connect the clamping unit with an elastic element.EFFECT: improving the functional and operational properties of the vehicle fastening device on the dynamic stand.1 cl, 4 dwg

Description

The invention relates to test benches used in the processes of research and development of wheeled vehicles, in particular cars.

Currently, the increasing flow of vehicles on public roads leads to an increase in noise pollution of the environment. At the legislative level, decisions are made to limit the levels of external noise emitted by vehicles. Solving the problem of reducing the acoustic pollution of the environment and improving the acoustic comfort in the cockpit of ground wheeled vehicles is an important urgent task for developers and researchers of transport technology, which requires large material, time and intellectual costs. The most mobile and productive research and development processes, in particular, of wheeled vehicles in terms of noise and vibration comfort, are experimental studies carried out in bench conditions, using a variety of techniques for simulating speed and load modes, identical to road (field) test conditions (for example, dynamic stands with running drums), stationary measuring and analyzing equipment. Constant test conditions that do not depend on the weather and the state of the road surface, the convenience of reading and analyzing measurement information contribute to the ever wider spread of bench studies of vibroacoustic processes occurring in ground wheeled vehicles. In view of the fact that the main vibration-noise-active source of a vehicle is its power plant, in particular, an internal combustion engine (ICE) equipped with intake, exhaust and cooling systems, it is very important to conduct research and refinement of these dominant noise sources on a dynamometer when simulating various high-speed and loading modes in free sound field conditions.

A fairly complete imitation of the conditions of high-speed and load modes of movement of a car in real road conditions can be achieved in semi-anechoic or anechoic acoustic chambers, contributing to the formation of a free sound field in the measurement zones, on dynamometer stands located in the chambers containing low-noise running drums, the practice of which has found widespread use. at enterprises producing motor vehicles and in research institutes.

From the prior art, dynamic stands with running drums for acoustic research of a car are known, presented in the descriptions for utility model patents RU 28772, 20791, 23503, 30195, 31651, 31652, 33227, 50309, 50310, 43365. During bench tests for the study of noise a car in a semi-anechoic acoustic chamber on such dynamic stands, a special car fastening device is used, which keeps the car from moving in space. This attachment device is a set of retaining flexible elements, preferably in the form of cables with a tension mechanism in the form of four electric winches, installed under the floor of the chamber in the engine room of the test chamber. The car, mounted on the running drums of the dynamic stand, is fixed with cables to the towing hooks (eyes, hooks). Flexible elements, performing the function of tensioning elements, are placed on the drums of the electric winches through the vertical posts installed in the groove guides of the stand and the rotary plates of the stand electric winches mounted in the floor. One of the disadvantages of using flexible elements placed on the drum of electric winches is the possibility of the formation of an unstabilized position of the flexible element (the so-called "swelling" of the turns) on the drum of the electric winch due to the fact that the required tension of the flexible element is not provided when it is subsequently weakened, for example, when dismantling from towing the lugs of the car, which leads to wear of flexible elements, and in some cases to jamming of the winch.

A technical solution is known from the prior art, which helps to prevent the phenomenon of swelling of the turns of flexible elements, in which the winding drums of the winches are equipped with known devices in the form of tensioners. Typically, these tensioners are a spring-loaded pressure roller mounted on an axle in a frame that is mounted to the winding reel flanges. For example, the design of such a tensioner for a flexible element as part of a winch is presented in an information review of the Lorri-Trans company (electronic resource, access mode: https://lorri-trans.ru/catalog/tehinfo/lebedka-kamaz/lebedka-reduktor/) ... However, the use of such tensioners in the design of a vehicle fastening device on a dynamic stand is ineffective due to the intensive operation of bench equipment, including electric winches. In this case, there is a frequent periodic weakening of the spring element of the tensioner with a corresponding violation of the stabilization of the position of the cable on the surface of the winding drum.

The closest technical solution, chosen as a prototype, is a device for fastening a car on a dynamic stand with running drums, described in the patent for a useful model RU No. 23503 (publ. 20.06.2002). The fastening device contains a car mounted on the running drums, equipped with towing hooks in front and behind, the spatial movement of which is limited by holding flexible elements, preferably cables, fixed in fastening devices mounted on the floor of the stand. The fastening devices are made in the form of two pairs of fixed vertical pivot struts, located in pairs relative to the front and rear parts of the car body, and one pair of struts movable in the direction of the longitudinal axis of the car. Retaining flexible elements that form a slinging system, acting as tensioning elements, are laid on the winding drums of the winches through the rotary plates mounted in the floor. A disadvantage of the known design of the vehicle fastening device on a dynamic stand with running drums is the insufficient reliability of the flexible elements laying on the winch winding drum when performing numerous tension-loosening operations of the slinging system.

The objective of the invention is to improve the functional and operational properties of the vehicle fastening device on a dynamic stand with running drums.

The problem is in the device for fastening a car on a dynamic stand with running drums, containing a car mounted on running drums, equipped with front and rear towing hooks, the spatial movement of which is limited by holding flexible elements laid with the possibility of longitudinal movement through fastening devices in the form of vertical posts on the winding drums of winches mounted under the floor of the stand.

What is new is that the flexible element near the area of the vertical post is equipped with a tightening mechanism containing a clamping unit and an elastic element, where the clamping unit, which is formed with the possibility of movement along the flexible element, is made including a body provided with guide rollers holding the flexible element in the cavity housing, a clamp located in the housing, by means of a hinge connection connected with the above housing and with a holder intended for connecting the clamping unit with an elastic element, and the elastic element is elastically connected on its one side with the holder of the clamping unit, and on its other side with the support bracket located on the vertical post.

The elastic element is preferably made in the form of a spring.

The invention is illustrated by drawings:

- in Fig. 1 shows an acoustic anechoic test chamber with a mounted dynamic stand with running drums mounted on them by the vehicle under study, which is fixed on the stand by the claimed fastening device;

- in Fig. 2 shows the main (frontal) view of the tightening mechanism of the vehicle fastening device on a dynamic stand with running drums;

- in Fig. 3 shows a top view of the tightening mechanism of the vehicle fastening device on a dynamic stand with running drums;

- in Fig. 4 shows a general view of the clamping unit of the pull-up mechanism.

Positions in the figures indicate:

1 - device for fastening a car on a dynamic stand with running drums;

2 - running drums of the dynamic stand;

3 - car;

4 - towing hooks;

5 - holding flexible element;

6 - floor of the acoustic semi-anechoic chamber;

7 - vertical posts;

8 - winding drum of the electric winch;

9 - electric winch;

10 - acoustic semi-anechoic chamber;

11 - pull-up mechanism;

12 - clamping unit;

13 - elastic element;

14 - case;

15 - guide rollers;

16 - connecting element;

17 - clamp;

18 - connecting element;

19 - holder;

20 - support bracket;

21, 22 - a section of a flexible element 5.

The claimed device 1 for fastening a car on a dynamic stand with running drums contains a car 3 installed on the running drums 2, equipped in front and behind with towing hooks 4, the spatial movement of which is limited by holding flexible elements 5, movably mounted in the fastening devices 6 mounted on the floor in the form of vertical posts 7 and laid in the winding drums 8 of the electric winches 9 located under the floor 6 of the acoustic semi-anechoic chamber 10. The device 1 for fastening the car 3 is equipped with a tightening mechanism 11 containing a clamping unit 12 located on the surface of the flexible element 5 near the area of the vertical post 7, and an elastic member 13, preferably made in the form of a spring. The clamping unit 12 is an assembled structure that includes a guide body 14 made with the possibility of movement along the flexible element 5, containing guide rollers 15 holding the flexible element 5 in the cavity of the body 14, pivotally connected by a connecting element 16, preferably in the form of a cylindrical rod, with a clamp 17, which in turn is pivotally connected by means of a connecting element 18, preferably in the form of a screw, with a holder 19 intended for connecting the clamping unit 12 with an elastic element 13, which is connected to a support bracket 20 located on a vertical post 7. Axes of the guide rollers 15, the axis of the connecting element 16 of the clamp 17 with the housing 14 and the axis of the connecting element 18 of the clamp 17 with the holder 19 are offset relative to each other.

The tightening mechanism works as follows. After completing the procedure for installing the car 3 on the running drums 2 and fixing the flexible element 5 in the towing hooks 4 of the car, the guide body 14 moves along the flexible element 5. This stretches the elastic element 13, preferably made in the form of a spring, and fixes the flexible element 5 clamp 17 to the guide body 14. If it is necessary to roll out the car 3 from the running drums 2, the flexible element 5 is weakened from the rear of the car 3, which rolls off the surface of the running drums 2, while the section 21 of the flexible element 5 between the towing hooks 4 and the vertical struts 7 weakens, and the section 22 of the flexible element 5 between the vertical post 7 and the electric winch 9 remains in a taut state, held by the clamping unit 12, spring-loaded by the elastic element 13, preventing the flexible element 5 from swelling on the winding drums 8 of the electric winch 9.

Practical implementation of the claimed device for fastening a car on a dynamic stand with running drums will prevent swelling of the flexible element on the winding drums of an electric winch, improve the functional and operational properties of the fastening device, and the safety of the process of testing a car on a dynamic stand.

Claims (1)

A device for fastening a car on a dynamic stand with running drums containing a car mounted on running drums, the spatial movement of which is limited by holding flexible elements laid with the possibility of longitudinal movement through fastening devices in the form of vertical posts on the winding drums of winches mounted under the floor of the stand, characterized in that that the flexible element near the area of the vertical post is equipped with a tightening mechanism containing a clamping unit and an elastic element, where the clamping unit, formed with the ability to move along the flexible element, is made including a body provided with guide rollers holding the flexible element in the body cavity, a clamp, located in the housing, by means of a hinged connection connected with the aforementioned housing and with a holder designed to connect the clamping unit with an elastic element, moreover, the axes of the guide rollers, the axes of the connecting elements of the clamp with the body and the holder are displaced relative to each other, and the elastic element is elastically connected on one side with the holder of the clamping unit, and on its other side with a support bracket located on the vertical post.

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