RU2738872C1 - Rod end of torsion stabilizer of transverse stability of vehicle body - Google Patents

Abstract

FIELD: transport machine building.

SUBSTANCE: invention relates to the field of transport machine building, in particular to tips of traction stabilizer stabilizers of bodies of vehicles. Tip comprises housing and radial spherical bearing. External ring of the bearing is installed in the housing, and the internal one - on the pin. Flange bushings are installed on the ends of the pin. Said sleeves are fixed by bolts. Bolts are installed with eccentricity relative to pin axis. Rigid spacers and resilient annular gaskets are installed between bushes and ends of inner ring of bearing. Flanged bushings can be rigidly installed on vehicle body, and body can be connected with stabilizer rod.

EFFECT: excluding finger turn relative to bushings.

3 cl, 3 dwg

Description

The present invention relates to the field of transport engineering (mainly to car building), in particular - to rods of anti-roll bars (lateral tilt) of railway, mainly passenger, cars, as well as trackless vehicles.

Known torsion stabilizers (TS) as part of wheel bogies of railway cars and trams with one torsion device in the secondary suspension system, and the torsion bar is located along the bolster (bolster), movably connected to the longitudinal beams of the bogie frame, and with the help of two lever systems - with bolster, so that when the latter is tilted in the lateral (transverse) direction with respect to the direction of the bogie, the force of elastic reaction arising in the torsion bar tends to return the bolster to its original position [1. RU 2220863 C2, B61F 5/00, 10.01.2004]. In this vehicle, the torsion bar is connected to the longitudinal beams of the bogie by means of bearing (radial slide bearings) supports. Two lever systems are attached to the torsion bar. Suspension rods pivotally attached to the levers are connected to the bolster.

Radial spherical bearings have found application in rod ends and structurally similar devices (for example, in a roller cone drill bit and in turbomachines) [2. RU 2437998, E21B 10/22, 27.12.2011]; [3. RU 2237200, F16C 17/02, F16C 23/02, 27.09.2004]; [4. RU 2239107, F16C 17/02, 27.10.2004].

However, the design of bearing assemblies significantly depends on the purpose, design requirements and operating conditions of the device as a whole.

These examples are described here for a brief overview of the structures of the vehicle of railway cars, since the claimed invention claims to be constructive and functional originality of only fragments of the vehicle, to understand the "place and relationship". Their "global" problem is associated with the alternation of loads transmitted from the bolster to the ends of the torsion bar, which means that there are restrictions on increasing the durability (service life, performance, reliability) of all successively operating links and their interconnections (especially taking into account the working clearances and backlash between them - not only "production" and "assembly", but also acquired during the operation of the stabilizer.

The foreign torsion stabilizer described in the source [5. Solutions. - URL: https://www.ferrabyrne.co.uk/ solutions / (published date: 25.02.2020)].

Many rod ends are also known in the automotive industry (steering rods, for example). In terms of a set of parts and their interconnection, the tips described in information sources [6. RU 190458 U1, B62D 7/20, F16C 11/06, 01.07.2019] and [7 RU 194133 U1, F16C 11/06, B62D 7/20, 28.11.2019] (see their criticism below in relation to the prototype ).

As the closest analogue (prototype) to the claimed device for its intended purpose and in terms of a combination of essential design features, the rod end of the torsion stabilizer of the vehicle body can be adopted, containing a housing and a radial spherical bearing with the outer concave friction pair forming a friction pair (s) ) a ring (clip) in the tip body, and an inner (s) convex (s) ring (clip) mounted on the pin, with the latter fixing against rotation and axial displacement relative to the body and the possibility of mounting a rod on it [8. RU 2556255 C2, F16C 11/06, F16C 17/12, 10.07.2015].

However, with the general purpose of the entire prototype tip and the claimed invention, such a device does not allow for guaranteed prevention of rotation of the finger relative to the inner ring of the bearing during operation of the device, especially when the thrust is skewed (caused by inaccuracies in the implementation of the spherical bearing surfaces) and during prolonged operation with inevitable wear of friction pairs ... In addition, the lubricated bearing is not isolated from the environment (with attendant loss of lubrication and contamination, including loose abrasive, and moisture ingress on the surface of the pin and inner ring of the bearing).

In accordance with the indicated general shortcomings of the prototype and other highlighted analogs, in the context of the increasing role of lateral stability stabilizers ("lateral rolling") in application to high-speed rolling stock cars (and other ground vehicles), the task of increasing technical and operational the possibilities and characteristics of the structure, namely, a significant increase in durability (operability, service life before overhaul).

So, the problem to be solved by the claimed invention (device) is to propose a technical solution to the problem of dynamic rotation of the axis relative to the inner ring (cage) of the bearing and the skew of the thrust, plus reliable isolation of the bearing assembly and pin from the environment, plus simplification of the device with increased manufacturability, to design (design to develop) a tip for a torsion stabilizer of lateral stability, mainly of a railway car, with improved technical and operational characteristics (TEH) in terms of service life (long-term operability) with constructive simplicity. Moreover, if it matches (according to the customer's specifications) the group of mechanical design M26 in accordance with GOST 30631.

The planned technical result of use is the improvement of the TEC of the thrust of the torsion stabilizer of lateral stability (for example, a railway carriage) due to:

- elimination of finger rotation and, as a result, reduction of wear in the tip;

- reliable isolation of the bearing assembly and pin from the environment;

- simplification of the device.

The solution to the indicated problem (task) is achieved by the fact that in the rod end of the torsion stabilizer of the vehicle body, containing the housing and the radial spherical bearing with the outer concave (s) ring (s) forming the friction pair in the tip body, and the inner ( her) with a convex (th) ring with a cage) mounted on the pin, with fixing the latter against rotation and axial displacement relative to the body and the possibility of mounting a thrust on it, according to the claimed invention, flange bushings are symmetrically installed at the ends of the pin, each by means of a cylindrical mating and a bolt, screwed from the end through its body into the pin, with fixing the pin against rotation and axial displacement, as well as the possibility of rigid connection of the flange bushings with the body, while the said end bolts are screwed in with eccentricity relative to the common axis of the pin, and between the flange bushings and the ends of the inner ring of the bearing provided consistently integral rigid spacers and elastic washers.

Particular sets of essential features of the device are also aimed at solving the problem posed within the framework of the main set of its features, formulated in the previous paragraph and further in the claims, namely:

- the finger can be made of the same diameter along its entire length, not counting the end chamfers (this determines the extreme simplicity of the finger as a detail);

- the bearing from the ends can be insulated by anthers, resiliently supported (by means of spring rings) on the mentioned rigid spacers and screwed through the pressure rings to the ends of the tip body (this makes it possible to more efficiently solve the problem of isolating the bearing from the external environment than in analogues using anthers) ...

Among the array of known devices, no such were found, the set of essential features of which would coincide with the stated set of features. At the same time, it is due to the latter that a new technical result is achieved, which determines the presence in the claimed device of the first qualifying feature of the invention - “the world level of novelty”.

The set of distinctive essential features of the claimed device is not a simple sum of the known technical results of using separately known system components. There is a "supereffect" (in the patent meaning of this term), which was not obvious to a specialist from the state of the art achieved (of course, before considering the proposed technical solution). This convincingly demonstrates the inventive step of development as the second of the triad of qualifying features of the invention.

The third qualification feature of a utility model, industrial applicability, is also indisputable and follows from the vast world experience of car building, the availability of a successfully tested (under supervision) experimental model of the device, as well as the fragment of the list of purchased basic components of the device, the production of which is industrially mastered below. ...

The essence of the invention (using the example of a railway car as a priority object of implementation) is disclosed in more detail in the examples below, illustrated by figures 1-3:

in fig. 1 shows a 3D image of a computer model of the tip as a fragment of a torsion stabilizer, general view, where the positions are entered: 1 - tip body; 5 and 6 - flange bushings; 11 and 12 - holes in the flanges of the bushings 5 and 6, respectively; 21 and 22 - clamping rings; 23 - threaded shank of the rod end;

in fig. 2 (main drawing) is an image of a computer model of the tip as a fragment of a torsion stabilizer, longitudinal section, where e is the eccentricity of the bolt relative to the longitudinal axis of the pin; additionally introduced positions: 2 - outer ring (cage) of the bearing; 3 - inner ring (cage) of the bearing; 4 - finger; 7 and 8 - cylindrical mating of the pin (holder) with flange bushings 5 and 6, respectively; 9 and 10 - single bolts for fixing the pin 4; 13 and 14 - spacer sleeves; 15 and 16 - ring gaskets; 17 - persistent collar; 18 - spring retaining ring; 19 and 20 - anthers.

in fig. 3 is an image of a computer model of the tip as a fragment of a torsion stabilizer, view A in FIG. 2 (with a local cut).

The rod end of the torsional anti-roll bar of the vehicle body contains (see Fig. 2) a tip housing 1 and a radial spherical bearing with a friction pair with an outer concave ring 2 built into the body 1 and an inner convex ring 3 mounted on the pin 4. On the ends of the pin 4 are symmetrically mounted flange bushings 5 and 6, each by means of a cylindrical mating 7, 8 and a single bolt 9, 10, respectively. The bolt 9, 10 is screwed from the end of the flange sleeve 5, 6 through its body into the pin 4, with an eccentricity e (for example, within 4 mm) relative to the common axis of the pin 4, which ensures the fixation of the pin 4 simultaneously against rotation and axial displacement relative to the flange bushings 5, 6 (and, therefore, with respect to the body). The possibility of rigid connection of the flange bushings 5, 6 with the body is also provided (holes 11, 12 in their flange part). In this case, between the flange bushings 5, 6 and the ends of the inner ring 3 of the bearing are provided in series with rigid spacer bushings 13, 14 and elastic annular spacers 15,16.

The outer ring 2 of the bearing is secured against axial displacement by a thrust shoulder 17 of the tip housing 1 and a snap ring 18 inserted into the housing 1.

The pin 4 is made, preferably, of the same diameter along its entire length, not counting the chamfers at its ends (end chamfers).

The bearing at the ends is preferably insulated by anthers 19, 20, elastically supported on rigid spacer sleeves 13 and 14, respectively, and screwed through the pressure rings 21, 22 to the ends of the tip body 1.

An external thread is made on the tip shank 23.

An example of the implementation of the TS uses specific, modern components mastered by the industry (which additionally convinces of the fulfillment of the patented criterion of the invention "industrial applicability"), in particular standard products: bolts, nuts, washers (according to the relevant GOSTs), spherical spherical bearings GEH 45 ES ( SKF) (this is especially important and is one of the reasons for introducing rigid spacers 13 and 14 into the design), inner circlips 75 × 2.5 DIN 472. Original parts in production do not require any non-existent technologies.

The claimed invention is included in the technical documentation developed by the applicant organization to create a passenger car (s), a prototype of one of which has already been manufactured.

The claimed device of the tip, using one of the two rods as an example, works as follows (of course, in the context of the entire vehicle).

When the body tilts laterally, the torsion shaft (not shown) is elastically twisted and creates a force on the levers (not shown), preventing this lateral tilt and tending to return the body to its original position. In the case of lateral displacement (offset) of the body 1, an elastic inclination is carried out in the direction opposite to the offset. This effect arises due to the presence of the angle of inclination of the rods to the vertical and mutual displacement and twisting of the levers with the torsion shaft. In this case, multidirectional forces arise on the levers, which, through the rods, act on the body and tilt it in the opposite direction of the relation. The combined force of these two forces tends to return the body to the equilibrium position (preventing body roll).

However, from the point of view of the claimed invention, the following physical processes (effects) in the rod ends are of particular interest.

The presence of eccentricity "e" of bolts 9, 10 simply and reliably prevents rotation of the pin 4 relative to the flange bushings 5, 6, and therefore the body, which prevents wear of the pairs “pin 4 - inner ring 3 of the bearing”, ensures its kinematic certainty, prevents thrust misalignments ... And in the cylindrical interface 7, 8 it is easier to endure cyclic dynamic loads, in comparison with spline and keyway joints as means of rotation.

The presence of rigid spacer sleeves 13, 14 with their forced relatively large lengths (this is determined by the general geometry and layout of the assembly) increases the reliability of axial fixation and, moreover, is a favorable condition for the elastic support of anthers 19, 20 on them with compression by spring rings

Elastic O-rings 15, 16 are two-functional: they provide a "dimensional chain" (compensation for manufacturing and assembly errors, etc.) and (in accordance with the statement of the problem) protect the inner surface of the inner ring 3 of the bearing and the cylindrical surface of the pin 4 from moisture ingress from the outside.

Thus, the complex of the proposed technical innovations solves the complex problem posed. The use of such rod ends will not only increase their reliability and durability (service life), but also greatly facilitate, simplify and reduce the cost of the device, and increase the manufacturability of production and repair. This means, to improve the TEC of the torsion stabilizer as a whole. It becomes achievable (using the example of a railway car) to increase the durability (up to the specified 1 million loads at the maximum load and the maximum angle of twist of the torsion shaft). In quantitative terms, according to T3, these are:

- increase in mean time between failures (at least 1,200,000 km of a car's run);

- increase in the full service life (at least 16 years and the warranty period of at least 8 years or 2,400,000 km of the car's run);

Claims (3)

1. The rod end of the torsional anti-roll bar of the vehicle body, containing a housing and a radial spherical bearing with a friction pair with an outer concave ring in the tip body and an inner convex ring mounted on the pin, with fixing the latter against rotation and axial displacement relative to the body and the possibility of mounting thrust on it, characterized in that flange bushings are symmetrically installed at the ends of the pin, each by means of a cylindrical mating and a bolt screwed from the end through its body into the pin, with fixing the pin against rotation and axial displacement, as well as the possibility of rigid connection of the flange bushings with the body , while the said end bolts are screwed in with eccentricity relative to the common axis of the pin, and between the flange bushings and the ends of the inner ring of the bearing are provided in series with rigid spacers and elastic annular spacers. 2. The tip of claim. 1, characterized in that the pin is made of the same diameter along its entire length, not counting the end chamfers. 3. A tip according to claim 1, characterized in that the bearing at the ends is preferably insulated by anthers resiliently resting on said rigid spacer sleeves and screwed through the clamping rings to the ends of the tip body.

Images