RU2235034C1 - Crawler vehicle track roller - Google Patents

Abstract

FIELD: transport engineering.

SUBSTANCE: invention can be used in industrial tractors and other crawler vehicles. Proposed track roller contains roll 1 installed on fixed shaft 2 with ring projection 3 on two sliding bearings arranged at its both sides and including housing 4 with flange 5 in which holes are for bolts 6 for fastening to roll 1. Housing 4 accommodates antifriction bushing 7 with flange 8 made flush with face 9 of sliding bearing housing 4. Spacer 10 is installed in roll 1 over ring projection 3 of shaft 2 for thrusting through its end faces 11 against end faces 9 of housing 4. length of spacer 10 exceeds length of ring projection 3 by value of guaranteed axial clearance 12. Covers 12 are fitted on ends of shaft 2 by means of which roller is fastened by bolts to frame of crawler vehicle bogie. Covers 13 are fixed on shaft 2 by lockrings 16 thanks to which pressing of end seals between cover 13 and flange 5 is provided.

EFFECT: reduced number of parts which require high accuracy at making of linear dimensions.

2 dwg

Description

The invention relates to the field of transport engineering, namely the production of tracked vehicles. It can be used on industrial tractors and other tracked vehicles.

When assembling the roller, an axial clearance is provided, which ensures smooth rotation of the roller relative to the axis in the roller. The larger this gap, the easier the rotation of the roller. However, an increase in the axial clearance makes the joint of the sealing rings vulnerable, especially since during operation of the tracked vehicles, the roller receives significant loads, especially axial loads, which can additionally increase the axial clearance. Opening the joint of the sealing rings leads to a leak of lubricant and a deterioration in the performance of the roller. This implies the desire of designers to ensure a guaranteed axial clearance, i.e. with tolerances that allow smooth rotation of the roller and exclude the disclosure of the joint of the sealing rings.

A known track roller of a tracked vehicle in which guaranteed axial clearance is provided (see RF patent for invention No.2009934, IPC 5 B 62 D 55/14 “Track roller of a tracked vehicle”, claimed. 1991.11.27). The known roller contains an axis 4 with an annular protrusion 5 and a rotating housing 1 with mechanical seals 6, and the housing 1 is made of two halves 3 and 2, connected by a thread 7 to the adhesive layer 8. On the inner surface of the halves 2 and 3 there are end stops 9, in contact with the annular protrusion 5.

The guaranteed axial size in the specified design of the roller is achieved by the exact execution of the linear dimensions of the following parts: end stops 9 of the housing 1, the annular protrusion 5 and the place of the threaded joint 8 of the two halves 2 and 3. Despite the relatively small number of parts involved in ensuring guaranteed axial clearance, the procedure this one is quite laborious due to the presence of thread.

The closest in essential features, the achieved effect to the claimed device and selected as a prototype is a track roller of a tracked vehicle containing a roller mounted on a fixed axis with an annular protrusion by means of two sliding bearings located on both sides of the last, including a housing with a flange in which are made holes for bolts of fastening to the roller, and an antifriction sleeve fixed in the housing with a flange in contact with the annular protrusion of the axis on which it is mounted s covers with seals (see. Dismantling and assembling the STALINETS-80 tractor. / Ed. by M.F. Balzhi and I.Ya. Trashutin. M: State Publishing House of Agricultural Literature, 1949, pp. 215-216).

In the prototype, the procedure for ensuring a guaranteed axial clearance is simpler, because no threaded parts. It is defined as the distance between the bronze flange of the antifriction sleeve and the annular protrusion of the axis. Under axial dynamic loads, the bronze flange protruding beyond the end of the plain bearing housing is first hit and crushed, which leads to an increase in axial clearance, which means that there is a danger of the joint of the sealing rings opening. Specifically, the guaranteed axial clearance is determined by the difference in linear dimensions in the following details, namely: in the roller, two housings of sliding bearings, two flanges of antifriction bushings and an annular protrusion of the axis. Improving the accuracy leads to the complexity of manufacturing parts, and therefore, to the complication of ensuring a guaranteed axial clearance.

The task of the invention is to simplify the guaranteed axial clearance.

The technical result that allows us to solve this problem is to reduce the number of parts requiring high accuracy of linear dimensions.

This task is achieved by the fact that in the known roller of a tracked vehicle containing a roller mounted on a fixed axis with an annular protrusion by means of two plain bearings located on both sides thereof, including a housing with a flange in which holes are made for bolts of fastening to the roller, and fixed in the housing, an antifriction sleeve with a flange in contact with the annular protrusion of the axis, at the ends of which caps with seals are fixed, according to the invention, mounted in a roller above the annular protrusion mentioned axis of the spacer sleeve with the possibility of stopping its ends against the ends of the bearings, made flush with the flanges of the antifriction bushings.

The roller may contain a spacer sleeve with a length equal to the sum of the lengths of the annular protrusion of the axis and the guaranteed axial clearance between the latter and the end face of the plain bearing housing.

The roller may contain a flange and a housing of sliding bearings, made separately from each other.

Studies conducted on the sources of patent and scientific and technical information have shown that the inventive track roller of a tracked vehicle is unknown and should not be explicitly learned from the prior art, i.e. meets the criteria of “novelty” and “inventive step”.

The proposed device can be manufactured in industrial conditions of workshops of large factories or specialized small enterprises on standard equipment, which is produced by both domestic and foreign industry.

Therefore, the claimed device meets the criterion of "industrial applicability".

The proposed set of essential features gives the claimed device new properties that allow you to solve the problem.

The ends of the spacer sleeve abut against the ends of the housings of the radial plain bearings, flush with the flanges of the antifriction bushings. The distance of the spacer sleeve exceeds the length of the annular protrusion of the axis by the amount of the guaranteed axial clearance. In this case, it is required to precisely perform the linear dimensions of only two parts, namely: the spacer sleeve and the annular protrusion of the axis.

Therefore, it is simplified to ensure a guaranteed axial clearance.

The proposed roller tracked vehicle is illustrated by drawings, which show:

figure 1 - the inventive roller in the context;

figure 2 is a fragment of a variant of the inventive roller in section according to claim 3 of the claims.

The inventive device comprises a roller 1 mounted on a fixed axis 2 with an annular protrusion 3 by means of two sliding bearings (not indicated) located on both sides thereof, including a housing 4 with a flange 5 in which holes (not marked) are made for bolts 6 of the fastening to the roller 1. In the housing 4 is fixed anti-friction sleeve 7 with a flange 8, made flush with the end face 9 of the housing 4 of the sliding bearing.

In the roller 1, a spacer 10 is mounted above the annular protrusion 3 of the axis 2 with the possibility of abutting its ends 11 against the ends 9. The length of the spacer 10 exceeds the length of the annular protrusion 3 by the amount of the guaranteed axial clearance 12.

It is calculated on the basis of the minimum allowable value with tolerances of plus and minus.

The housing 4 of the sliding bearing can be made separately with the flange 5. In this embodiment, the housing 4 is a sleeve pressed into the roller 1 as far as it will go into the distance sleeve 10, and the flange 5 is a ring with holes for the bolts 6 of the fastening to the roller 1.

Covers 13 are fixed on the axis 2, in which, like in the flange 5, grooves (not marked) are made for installing mechanical seals (not marked). Each of them consists of two cast iron lapped o-rings 14 with a microcone and two rubber rings 15 worn on them, which serve as springs. The covers 13 are fixed on the axis 2 by the retaining rings 16, which ensures the compression of the mechanical seals, ensuring the tightness of the inner cavity of the roller. They prevent the outflow of grease out and the ingress of the abrasive.

By means of the covers 13, the roller is bolted to the frame of the tracked vehicle trolley (not shown).

The proposed roller tracked vehicle is used as follows.

The roller 1 is rotated around a fixed axis 2 by means of sliding bearings. The presence of a spacer sleeve 10 exceeding the length of the annular protrusion 3 of the axis 2, allows to reduce axial dynamic loads on the flanges 8, while maintaining a guaranteed axial clearance 12. This ensures the reliability of the joint of the sealing rings 14. It does not open, reliably protecting the roller from leakage of grease and penetration of dirt.

The claimed invention has several advantages:

- increased workmanship;

- the reliability of the seals;

- reducing the complexity of manufacturing a number of parts;

- durability of a design.

Claims (3)

1. A track roller of a tracked vehicle, comprising a roller mounted on a fixed axis with an annular protrusion by means of two plain bearings located on both sides thereof, including a housing with a flange in which holes are made for bolts to attach to the roller, and an antifriction sleeve with a flange fixed to the housing in contact with the annular protrusion of the axis, at the ends of which caps with seals are fixed, characterized in that a spacer with the possibility of ra its ends into the ends of housings of sliding bearings, made flush with the flanges of antifriction bushings. 2. The roller according to claim 1, characterized in that the distance of the spacer sleeve is equal to the sum of the lengths of the annular protrusion of the axis and the guaranteed axial clearance between the latter and the end face of the plain bearing housing. 3. The roller according to claim 1, characterized in that the flange and the housing of the plain bearings are made separately from each other.

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