FR2559859A1 - BEARING SKATE STRUCTURE - Google Patents

Abstract

THE INVENTION RELATES TO A ROLLER SHOE STRUCTURE FOR HIGH PRECISION STRAIGHT GUIDANCE OF CONSTRUCTION UNITS MOVING ON TO ONE ANOTHER, INCLUDING A MAIN BODY INCLUDING COMPONENTS FORMING STRAIGHT-LINE SECTIONS OF A TRACK AND ENDLESS GUIDANCE OF ROLLS, TRACK SECTIONS REVERSE THE MOVEMENT OF THE ROLLERS, AND A LOAD-CARRIING ROLLER TRAIL WITH RECIRCULATION MOVEMENT; LATERAL GUIDE LOCKING GROOVES AND RETAINING RELEASE LOCKING GROOVES ARE SHAPED IN THE MAIN BODY 1 TO ENSURE THE CONNECTION OF THE MAIN BODY 1 WITH SIDE GUIDES, WHICH ENSURE A STRAIGHT GUIDANCE OF THE ROLLING ELEMENTS 5, 'WITH RETAINING RELATED ELEMENTS, WHICH PREVENT THE SAID ROLLING ELEMENTS FROM FALLING FROM THE ROLLER SHOE STRUCTURE WHEN NOT IN SERVICE, WITHOUT USE OF ANY LINKAGE ELEMENT.

Description

The present invention relates to a so-called skid structure of

bearing which provides guidance in

  straight line of machine parts, for example of slides

  buckets, tables, etc., moving one over the other. The construction according to the present invention has essential advantages over known constructions

  with regard to manufacturing and service life.

  The advantages are exclusively due to the construction according to the present invention which differs from all known and patented roller shoe structures.

  Part of the patents relating to constructions

  skates, for example US Pat. Nos. 3,111,350, 3,955,513, DE- patents 2,239,782, 2,414,198, No. 2,123,529, CH- 572,168 and GB - No. 1 407 387, relate to the arrangement of spacers between the rollers while other patents propose solutions for the shape of the grooves formed in the main body as well as for the method of blocking the end guides. US Patents 3,920,289, No. 3,915,513 and DE Patents No. 2,116,322, No. 2,421,328, No. 2,202,085 fall into the category

last mentioned.

  There are patents relating to roller shoe structures which are based on the formation of load bearing surfaces and on the reduction of the dynamic forces occurring on the input and output edges by making chamfers. In this regard, mention may be made of US Pat. Nos. 3,977,736, CH No. 594,148,

GB no 1 380 221 and DE 2 121 847.

  British patents 1 472 287 and 1 474 051 relate to fully constructed

  different from the subject of the present patent application.

  The structure of the running shoe described in HU patent No. 178,294 also differs essentially from the solution of the present patent application. On the one hand it involves several complicated components which do not participate directly in the main operation and which can be manufactured in a costly manner and on the other hand the connection of complicated and articulated components requires a set of junction elements which are superfluous and are the source of inaccuracies in the settings. The arrangement of the main body, which is defined as an advantage in the last cited patent and according to which the load-bearing surface is placed in the same plane with other surfaces of the main body containing different grooves and holes, is expressly disadvantageous by the fact that, during the machining of said surfaces by planar grinding, a strong surface undulation is recorded which originates from the line of holes because these have an influence on the regulation of the

grinding wheel.

  The running-in process exclusively ensures the reduction or elimination of this surface ripple

  and therefore it has no influence on the characteristics

  ques of service life and precision of the roller skate

is lying.

  The surface finish determining the service life and created by a planar grinding of high precision is ensured not by the running-in but by the effect

  of "standardization" of the rolling elements.

  The construction according to the invention is based on the principle that, as regards the execution of the main functions, that is to say the transmission of load and power, the running shoe structure comprises two important components , namely the body

main and rollers.

  The number of components used to perform auxiliary functions is reduced to a minimum and their structures make it possible to meet the requirements of a

  advantageous mass production, with great precision.

  Other characteristics and advantages of the invention will be highlighted in the rest of the

  description, given by way of nonlimiting example, in

  reference to the accompanying drawings in which: FIG. 1 is a bottom view of the running shoe structure according to the invention, showing its working surface, FIG. 2 is a side view of the structure of FIG. 1, FIG. 3 is a plan view of the structure of FIG.

  1, that is to say a view of its surface associated with an arrangement

  sitive to guide in a straight line, Figure 4 is a view of the end of the structure of FIG. 1, made in the direction of advance, Figure 5 is a sectional view taken along the line I-I of FIG. 2, Figure 6 is a sectional view taken along line II-II of FIG. 2, FIG. 7 is a view in vertical longitudinal section taken along line III-III of FIGS. 3, 4, 5 and 6, FIG. 8 is a view in vertical longitudinal section made in a mediating plane corresponding to line IV- IV of FIGS. 3, 4, 5 and 6, FIG. 9 is a cross-sectional view of the main body of a running shoe structure, FIG. 10 is an enlarged view of detail B in FIG. 6, showing the structural relationships between the main body, the rolling elements back therein, and a support, Figure 11 is an enlarged view of detail A in Figure 6, showing the structural relationships between the body prindpal, the rolling elements moving on the load-bearing surface and a lateral guide, FIG. 12 is an enlarged view of detail C of FIG. 8 showing the structural relationships between rolling elements placed on the load-bearing surface of the main body and a curved insert which is

  shaped so as to constitute a return path for the elements

  rolling elements, FIG. 13 is a view in partial longitudinal longitudinal section taken along the line V-V of FIG. 2, FIG. 14 represents an embodiment of the running shoe structure according to the invention, with

  completely sealed return of the rollers.

  As shown in the figures, the main components of the running shoe structure are a main body 1, rolling elements 5 as well

than a side guide 2.

  The exit, entry and return of the rolling elements are ensured by end guides 6 and curved inserts 4. Retaining inserts 3 can prevent rolling elements 5 held in guide grooves formed by surfaces d-m2 of main body 1 to fall from skate of

  bearing completed mounting but not in use condition

  station. On the side j opposite the working surface, the same function is fulfilled by retaining ribs n1 of the lateral guides 2, which hold the rolling elements 5 in a track formed by guide surfaces m1 of the lateral guides 2 and by a load-bearing surface of

load b of the main body 1.

  Buffers 7 seal the holes in

  the extreme guides 6 to let lubricant pass.

  Scraping inserts 8, locked in the end guides 6, clean the running surface of the guide rail f and prevent pollutants from entering the inner part of the running shoe. The extreme guides 6 are fixed on the body

main 1 by screws 9.

  Attaching the running shoe to the surface

  blocking of a moving part of the machine can be carried out

  killed either by mechanical bolts 10 passing through the main body 1 and screwed into the movable part of the machine or by mechanical bolts arranged in the movable part of the machine and screwed into a thread M formed in the body

main 1.

  The sectional view of the main body 1 (FIG. 9) shows all the surfaces and surface configurations playing a particular role both in the arrangement of certain components of the running shoe and in its operation; at the same time these surface configurations highlight the absolute novelty of the running shoe in accordance with the invention compared with all

known constructions.

  The blocking surface a, which constitutes the static charge absorption surface of the main body 1, is connected to the blocking surface e of a movable part of the machine by the fact that the heads of the mechanical bolts which come to bear against the bearing face c block the main body 1 directly on the movable part of the machine via the holes ú for passage of

mechanical bolts.

  The relative blocking of the load absorbing surface b and the blocking surface e against each other without displacement and without the use of the mechanical bolts 10 can also be achieved by screwing mechanical bolts arranged in the movable part of machine

  in threads M formed in the main body 1.

  The lateral guides 2 are connected to the main body 1 continuously without any joining element but with conjugation of shapes by means of

  locking grooves z1 with trapezoidal cross-section.

  The retention elements 3 are also

  ment connected to the main body 1 continuously without any connecting element but with conjugation of shapes by means of locking grooves z2 of trapezoidal section. Unloaded rolling elements 5 are subject to return via the end guides

  6 in a return groove formed by lateral surfaces

  m2 and a lower surface d of the main body 1 in order to reach a charge absorption groove formed by a load absorption surface d and guide surfaces m1 of the lateral guides 2. The load absorption surface b is formed in the main body 1 from the side of the running shoe structure and it constitutes

  what's called the interior work schedule.

  The plane of the load absorbing surface b in the main body 1 is offset by a distance x relative to the bearing face c of the heads of the mechanical bolts 10 so that the machining of the load carrying surface b and of the bearing face c can be carried out independently of one another, which has a favorable influence on the precision and the service life of the running shoe. Thus the holes p formed in the bearing face c for the passage of the mechanical bolts 10 do not affect the characteristics of surface finish

  obtained by machining the load-bearing surface b.

  The main body 1 is therefore as a whole a prism-shaped body having the cross section indicated in FIG. 9 and which is provided in a transverse direction between the bearing face c and the blocking surfaces a of holes p of passage of mechanical bolts 10, as shown only in FIGS. 5 and 7. The load-bearing surface b and the lower return surface of the rollers d of the main body 1 are profiled, in the vicinity of the inlet and the outlet

  rolling elements, as shown in figure 8 -

  and detail C in FIG. 12. The profile corresponding to detail C is therefore applicable in the correct direction to the four entry and exit points of the guideways.

rolling elements.

  In accordance with what was mentioned above

  above, the two surfaces b and d have a roll entry section v2 of height u2 in the point or plane of connection with the curved added elements 4 and they are connected to the surfaces b and d by transition arcs

respective R2.

  The roll entry section v2 of height u2 adjacent to the transition arc R2 is of fundamental importance with regard to the operating characteristics and the service life of the structure.

running shoe.

  Adjustment holes q for the main body

  pal 1 are used for mounting the extreme guides 6 comprising the curved inserts 4, as indicated on the

Figures 7 and 13.

  The threaded adjustment holes q and the mechanical bolt holes ú join each other

for manufacturing reasons.

  The main role of the lateral guide 2 consists, as indicated for detail A in FIG. 11, in guiding the rolling elements 5 by guiding the lateral surfaces ml, that is to say so as to absorb the lateral forces.

  in the plane of said surfaces m1 in the form of a rub

  slip. A retaining rib n1 prevents the rolling elements 5 from falling from the non-rolling

in service.

  An interval h between the retaining rib n1 and the journal k of the rolling element serves to reduce

internal friction.

  There is an interval or a set of functions-

  ment y1 between the lower plane determined by the guides

  side 2 and the guideway surface, which is identi-

  than at the running surface q of the rolling elements 5,

  that is to say on the external working surface.

  The unique role of the retaining insert 3 is to prevent, as shown in detail B in FIG. 10, the rolling elements 5 fall from the groove of

  back under the action of groove n2 if the runner

is not in service.

  The interval h existing between the rib n2 of the attached retaining element 3 and the journal k of the rolling elements 5 makes it possible to reduce the internal friction. The curved inserts 4 are engaged in the end guides 6 by a mounting rib r and they serve as a curved path for the rolling elements inside the end guides 6. The structural relationships between the curved inserts 4 and other components are

255 985 9

  highlighted in Figures 8, 12 and 13.

  As shown in Fig. 12, cylindrical surfaces of the curved inserts 4 are connected to the roller inlet section v2 of the main body 1 via a mounting transition v3. The rolling elements 5 perform their

  endless movement passing through three different sections

your tracks.

  The first section is a load-bearing groove which is bordered by a load-bearing surface b of the main body, by guide surfaces m1 of the lateral guides 2 as well as by a rolling surface of the

guide rail f.

  The rolling elements 5 are stressed by a load only in the section mentioned above and they transmit the force corresponding to the load between the load-bearing surface b of the main body 1 and the

  running surface of guide rail 5, perpendicular-

ment to said surfaces.

  Lateral forces, i.e. sliding

  ment, acting in planes tangent to the rolling elements 5, occur in the case of an imprecise mounting of the rolling shoe mechanism, that is to say if the movable part of the guiding machine in a straight line undergoes a deviation. The above forces are absorbed by the

side guides 2.

  The second section produces an inversion of the rectilinear movement of the rolling elements along an arc of 180 '. The guidance of the rolling elements 5 in return is carried out in a return groove which is formed in the end guides 6 associated with the elements

reported curved 4.

  The third section is a roller return groove which is bordered by lateral surfaces m2 formed in the main body 1 and by a groove bottom surface d as well as by surfaces e for fixing movable parts of the machine. In said section, there is an interval Y2 between the upper envelope surface defined by the rolling elements 5 and the fixing surface e. To optimize the distribution of stresses between the rolling elements 5 and the load-bearing surface b as well as the rolling surface of the guide rail f, the rolling elements 5 are profiled as indicated

in figure 10.

  They are rounded at both ends; he

  a radius of curvature R is provided with a length of arron-

di v1 and a rounding height u1.

  The trunnions k of the rolling elements ensure that these rolling elements 5 can be

guided in a groove.

  The extreme guides 6 are fixed to the main body 1 by means of the screws 9 and threaded holes of

  setting A, as shown in Figure 13.

  FIG. 14 represents an embodiment of the running shoe mechanism according to the invention, where the role of the retaining insert 3 is amplified

  and includes not only the maintenance of the rolling elements

  5 in the return groove but also a protection

  complete dust-proofing of said groove. A retaining and dustproof insert 31, fitted into the

  main body z1 locking grooves, perfectly closed -

  the return groove. To avoid an overabundant antagonistic effect, a gap y3 is provided between the upper surface of the retaining and dustproof insert.

31 and the blocking surface.

  The material of manufacture of the main body 1

  and rolling elements 5 is high strength steel

  tance, the remaining components, with the exception of screws 9 of the extreme guides and mechanical bolts 10 which can be made of plastics or light metals of

various resistances and hardnesses.

  The lateral guides 2 and the extreme guides 6 are subject to more severe conditions as regards

  concerns mechanical resistance and resistance to abrasion

if we.

Claims (3)

  1. Roller pad structure for a   high-precision rectilinear guidance of construction units   tion moving one on the other, comprising a main body comprising components forming rectilinear sections of a rolling track and endless guide of rollers, sections of the track reversing the movement of the rollers, and a train of load-bearing rollers with recirculating movement, characterized in that grooves (z1) for blocking lateral guides and grooves (z2) for blocking retaining insert elements are formed in the main body (1) to provide the connection of said   main body (1) with lateral guides (2), which   rent a straight guide of the rolling elements (5), as well as with attached retaining elements (3), which prevent said rolling elements from falling from the skid structure   bearing when not in use, without use tion of any connecting element.   2. Running shoe structure according to the res-   dication 1, characterized in that a load-bearing surface of the main body (1) is not situated in the same plane as the bearing faces (c) of mechanical bolt heads, which fix said body (1) against a running surface of guide rails (f), but has an offset (x) relative to said bearing faces (c) so as to be able   increase manufacturing precision.   3. Roller shoe structure according to one of   Claims 1 or 2, characterized in that, with a view to extending   To manage the service life, to obtain more favorable operating characteristics and a uniform, correct and quiet operation, the load-bearing surface (b) of said main body (1) is provided with inlet sections   and output (v2) connected to it by transition arcs   tion (R2) having a well-defined height (n2) and ensuring   uniform and gradual absorption of the load.