CA1086807A - Cross-linear bearing unit - Google Patents
Cross-linear bearing unitInfo
- Publication number
- CA1086807A CA1086807A CA311,817A CA311817A CA1086807A CA 1086807 A CA1086807 A CA 1086807A CA 311817 A CA311817 A CA 311817A CA 1086807 A CA1086807 A CA 1086807A
- Authority
- CA
- Canada
- Prior art keywords
- balls
- bearing
- track
- rail
- bearing body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/04—Ball or roller bearings
- F16C29/06—Ball or roller bearings in which the rolling bodies circulate partly without carrying load
- F16C29/0633—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with a bearing body defining a U-shaped carriage, i.e. surrounding a guide rail or track on three sides
- F16C29/0652—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with a bearing body defining a U-shaped carriage, i.e. surrounding a guide rail or track on three sides whereby the return paths are at least partly defined by separate parts, e.g. covers attached to the legs of the main body of the U-shaped carriage
- F16C29/0654—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with a bearing body defining a U-shaped carriage, i.e. surrounding a guide rail or track on three sides whereby the return paths are at least partly defined by separate parts, e.g. covers attached to the legs of the main body of the U-shaped carriage with balls
- F16C29/0659—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with a bearing body defining a U-shaped carriage, i.e. surrounding a guide rail or track on three sides whereby the return paths are at least partly defined by separate parts, e.g. covers attached to the legs of the main body of the U-shaped carriage with balls with four rows of balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/25—Movable or adjustable work or tool supports
- B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
- B23Q1/56—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs only, the sliding pairs being the first two elements of the mechanism
- B23Q1/60—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs only, the sliding pairs being the first two elements of the mechanism two sliding pairs only, the sliding pairs being the first two elements of the mechanism
- B23Q1/62—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs only, the sliding pairs being the first two elements of the mechanism two sliding pairs only, the sliding pairs being the first two elements of the mechanism with perpendicular axes, e.g. cross-slides
- B23Q1/621—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs only, the sliding pairs being the first two elements of the mechanism two sliding pairs only, the sliding pairs being the first two elements of the mechanism with perpendicular axes, e.g. cross-slides a single sliding pair followed perpendicularly by a single sliding pair
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/008—Systems with a plurality of bearings, e.g. four carriages supporting a slide on two parallel rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/04—Ball or roller bearings
- F16C29/06—Ball or roller bearings in which the rolling bodies circulate partly without carrying load
- F16C29/0676—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with a bearing body or carriage almost fully embracing the guide rail or track, e.g. a circular sleeve with a longitudinal slot for the support posts of the rail
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/04—Ball or roller bearings
- F16C29/06—Ball or roller bearings in which the rolling bodies circulate partly without carrying load
- F16C29/068—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track
- F16C29/0692—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a guide rail or track of non-circular cross-section, e.g. with grooves or protrusions, i.e. the linear bearing is suited to transmit torque
- F16C29/0695—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a guide rail or track of non-circular cross-section, e.g. with grooves or protrusions, i.e. the linear bearing is suited to transmit torque with balls
- F16C29/0697—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a guide rail or track of non-circular cross-section, e.g. with grooves or protrusions, i.e. the linear bearing is suited to transmit torque with balls with polygonal guide rail or track
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
- F16D3/06—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted to allow axial displacement
- F16D3/065—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted to allow axial displacement by means of rolling elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2322/00—Apparatus used in shaping articles
- F16C2322/39—General build up of machine tools, e.g. spindles, slides, actuators
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bearings For Parts Moving Linearly (AREA)
Abstract
CROSS-LINEAR BEARING UNIT
Abstract of the Disclosure A cross-linear bearing unit comprising of: a bearing body having on its one surface a raceway which forms a load track and a return track and is adapted to fit a race bar therein, said bearing body further having a rail hole which forms a load track and a return track and is adapted to fit a rail therein, said rail hole piercing through the bearing body in the direction orthogonal with the raceway; balls inserted in said load track and return track; a retainer disposed in the raceway of the bearing body and serving to hold, out of the balls inserted in the groove of the raceway, the loaded balls in the manner that said balls are rolled while being kept in contact with both the load track surface of the bearing body and the load track surface of the race bar, said retainer also serving to hold the nonloaded balls in the manner that said balls are rolled freely in the return track of the bearing body; and another retainer disposed in the rail hole of the bearing body and serving to hold, out of balls inserted in the groove of said rail hole, the loaded balls in the manner that said balls are rolled while being kept in contact with both the load track surface of the bearing body and the load track surface of the rail, said retainer also serving to hold the nonloaded balls in the manner that said balls are rolled freely in the return track of the bearing body: wherein the rails are mounted on a bed horizon-tally or vertically through bearings respectively, and a slide base is attached to the race bars orthogonal with the rails.
Abstract of the Disclosure A cross-linear bearing unit comprising of: a bearing body having on its one surface a raceway which forms a load track and a return track and is adapted to fit a race bar therein, said bearing body further having a rail hole which forms a load track and a return track and is adapted to fit a rail therein, said rail hole piercing through the bearing body in the direction orthogonal with the raceway; balls inserted in said load track and return track; a retainer disposed in the raceway of the bearing body and serving to hold, out of the balls inserted in the groove of the raceway, the loaded balls in the manner that said balls are rolled while being kept in contact with both the load track surface of the bearing body and the load track surface of the race bar, said retainer also serving to hold the nonloaded balls in the manner that said balls are rolled freely in the return track of the bearing body; and another retainer disposed in the rail hole of the bearing body and serving to hold, out of balls inserted in the groove of said rail hole, the loaded balls in the manner that said balls are rolled while being kept in contact with both the load track surface of the bearing body and the load track surface of the rail, said retainer also serving to hold the nonloaded balls in the manner that said balls are rolled freely in the return track of the bearing body: wherein the rails are mounted on a bed horizon-tally or vertically through bearings respectively, and a slide base is attached to the race bars orthogonal with the rails.
Description
~` 108~807 Back round of the Invention g _ . _ .
Field of the Inv ntion:
The present invention relates to a bearing which is adapted for use at an intersection of a column and a cross rail in a machine tool such as boring or planing machine or at an intersection of vertical and horizontal shafts in a general conveyor so as to support and slide a heavy-weight object, and more particularly it relates to a cross-linear bearing unit capable of achieving accurate positioning of a slide member by linearly moving the same in bc,th vertical and horizontal ~
directions. ~ -Description of the Prior Art:
, A tool rest disposed on a column and a cross rail in a machine tool generally receives, during a machining operation, great forces exerted in floating, downward and horizontal directions in addition to the extremely large weight of its own. -Since such forces are exerted at a point spaced apart from the tool rest plate, a great floating load is applied to the column shaft. merefore, it has been customary heretofore to use a slide guide surface in the guide region for elimination of the resultant problem. In the case of a rolling guide, a large-diameter column shaft is employed with a bearing of a correspond _ i`ng large load capacity such as described in the U. S. Patent 3,003,828 or 3,341,262. However, incorporating the bearing of this type into a machine causes an increase in the production ~` cost due to the necessity of using an expensive hardened steel plate, and moreover it is extremely difficult to attain a high accuracy particularly in the case where a plurality of such
Field of the Inv ntion:
The present invention relates to a bearing which is adapted for use at an intersection of a column and a cross rail in a machine tool such as boring or planing machine or at an intersection of vertical and horizontal shafts in a general conveyor so as to support and slide a heavy-weight object, and more particularly it relates to a cross-linear bearing unit capable of achieving accurate positioning of a slide member by linearly moving the same in bc,th vertical and horizontal ~
directions. ~ -Description of the Prior Art:
, A tool rest disposed on a column and a cross rail in a machine tool generally receives, during a machining operation, great forces exerted in floating, downward and horizontal directions in addition to the extremely large weight of its own. -Since such forces are exerted at a point spaced apart from the tool rest plate, a great floating load is applied to the column shaft. merefore, it has been customary heretofore to use a slide guide surface in the guide region for elimination of the resultant problem. In the case of a rolling guide, a large-diameter column shaft is employed with a bearing of a correspond _ i`ng large load capacity such as described in the U. S. Patent 3,003,828 or 3,341,262. However, incorporating the bearing of this type into a machine causes an increase in the production ~` cost due to the necessity of using an expensive hardened steel plate, and moreover it is extremely difficult to attain a high accuracy particularly in the case where a plurality of such
- 2 - ~ .
'' . , ~ ,,, 108~8(~7 bearings are disposed at horizontal and vertical positions.
Summa and Ob ect of the Invention It is an object of an aspect of the present invention to provide a cross-linear bearing unit which is capable of achieving accurate positioning of a slide member mounted on a race bar by linearly moving the slide member in both vertical and horizontal directions, wherein the load-carry-ing capacity of a bearing body is increased, and the space between the race bar and a rail fitted respectively into a raceway and a rail hole can be minimized.
In accordance with one aspect of this invention there is provided a cross-linear bearing arrangement for support-ing and slide-moving a heavy load in two orthogonal directions, comprising: a) a flat bed for supporting the bearing arrangement and the load thereon; b) first and second parallel rails supported over said bed by bearing members; c) first, second, third and fourth bearing bodies extending outward and perpendicular to said flat bed, each said bearing body having an outer end and said bearing bodies respectively having a first, second, third and fourth rail hole extending through an inner portion thereof, said first rail passing through said first and second rail holes, said second rail passing through said third and fourth rail holes, said rail holes having grooves therein - and defining a load track and a return track in each said rail hole; d) first bearing balls disposed in said grooves;
e) an annular retainer disposed in each of said rail holes serving to hold, from out of said balls certain b~lls as loaded balls which are rolled while being kept in contact with both the load track of said bearing body and a load track surface of said rail, said retainer also serving to ^'~' ' " ' ' ' ' hold non-loaded balls so that said ~alls roll freely in said return track of said bearing body; f) first, second, third and fourth open raceways defined at the outer ends of each of said bearing bodies; g) first and second parallel race bars, said first race bar being disposed in said first and third raceways, said second race bar being disposed in said second and fourth raceways; h) loaded guide grooves of sub-stantially U-shape configuration in each said raceway and unloaded guide grooves adjacent each of ~aid loaded guide grooves defining a load track and a return track, respective-ly; i) second bearing balls held in each said raceway and a U-shaped re~ainer means in each said raceway for holding said second bearing balls, said retainer means serving to select, from among said second bearing balls in said raceway,load-ed balls, which are kept in contact with both the load track of said bearing body and a load track surface of said race bar and also serving to hold unloaded ones of said second ~-bearing balls to roll freely in said return track-of said bearing body; and j) a flat ~ide back mounted on said first and second race bars.
B ief Description of the Drawings Fig. 1 is a partially cutaway front view of a cross-linear bearing unit according to the present invention; Fig.
2 is a sectional view taken along the line II-II in Fig. l;
and Fig. 3 is a perspective view illustrating how the bear-ing unit of Fig. 1 is employed.
Detailed Describtion of the Invention Hereinafter an exemplary embodiment of the present invention will be described in detail with reference to the 30 accompanying drawings. .
As shown in Figs. 1 and 2, a raceway 3 where a race bar 2 -3a-,~
, ", .. . . . . ..
. . .
.
is fittable is formed on one side of a bearing body 1, and a rail hole 13 where a rail 12 is fittable is formed in the manner to pierce through the bearinq body 1 in the direction orthogonal with the raceway 3.
The raceway 3 in the bearing body 1 is equipped with loaded-ball guide grooves 7, 7 having a substantially U-shaped cross section and constituting a load track where loaded balls Sa, 5a are rollable in two rows, a nonloaded-ball guide grooves 8 formed between the guide grooves 7, 7 and having a substantia-lly U-shaped cross section and constituting a return track where nonloaded balls 5b, 5b are rollable in two rows, and grooves formed outside of the guide grooves 7, 7 and constitut-ing a return track where the nonloaded balls 5b are rollable in one row. The ends of the load-track grooves 7, 7 are connected respectively to the adjacent nonloaded-track grooves 8, 8, 8 so as to permit circulation of the balls.
The cross-sectional shape of the race bar 2 fittable into the raceway 3 in the bearing body 1 is uniform over the entire length and is symmetrical with respect to its left and right.
On shoulders 4, 4 of the race bar 2, rolling grooves 6, 6 for the loaded balls Sa, 5a are formed in the longitudinal direction at positions opposite to the nonloaded-track grooves 7, 7 of the raceway 3 in the bearing body 1, thereby constituting a rolling path for the loaded balls 5a, 5a through mutual cooperation. Along two sides of the race bar 2, recesses 11, 11 are formed in the longitudinal direction thereof correspond-ingly to the grooves 8, 8 which constitute the return track in the bearing body 1.
The balls are held in the raceway 3 of the bearing body 1 ~¦by a reta ner 9 in such a manner that the loaded balls Sa, Sa ll - 4 -` iO8~807 , .. re rolled into the retllrn-track grooves 8, ~, 8 while being~
kept in contact with the guide groov~s 7, 7 constituting the load track in the bearing body 1 and also with the rolling grooves 6, 6 .... formed in the race bar 2, meantime the unloaded balls 5b, 5b ... are rolled freely in the return-track grooves 8, 8, 8 of the bearing body 1 and are returned smoothly into the load-track grooves 7, 7.
The rail hole 13 formed in the bearing body 1 is equipped with loaded-ball guide grooves 17, 17, 17 having a substantially U-shaped cross section with a relatively small depth from the inner-diameter surface thereof and constituting a load track where loaded balls 15a, 15a are rollable in two rows, and nonloaded-ball guide grooves 18, 18, 18 having a substantially U-shaped cross section with a larger width and a relatively small depth from the inner-diameter surface and constituting a return track where nonloaded balls 15b, 15b are rollable in two rows. ~he bol:h guide grooves are arrayed alternately in the axial direction, and the ends of the load-track guide grooves 17, 17, 17 are connected respectively to the adjacent nonloaded-track guide grooves 18, 18, 18 so as to permit circulation of the balls.
The rail 12 fittable into the rail hole 13 in the bearing body 1 serves also as a spline shaft, whose cross-sectional shape is uniform over the entire length and is substantially triangular with swells and protrusions 23, 24, 25. And the two sides of each vertex of the triangle, rolling grooves 16, 16 for the loaded balls 15a, 15a are formed in the longitudinal direction thereof at positions opposite to the load-track guide groove 17 of the rail hole 13 in the bearing body 1, thereby constituting a rolling path for the loaded balls 15a, 15a I - _5_ Il .
through mutual cooperation.
The balls a~e held in the rail hole 13 of the bearing body 1 by a retainer 19 in such a manner that the loaded balls lSa, . 15a ..... are rolled into the return-track guide grooves 18, .~ 5 18, 18 while being kept in contact with the guide grooves 17, ,,, 17, 17 constituting the load track in the bearing body 1 and also with the rolling grooves 16, 16 ...... formed in the rail 12, meantime the unloaded balls 15b, 15b are rolled freely in the return-track guide grooves 18, 18, 18 of the bearing body 1 and are returned smoothly into the load-track guide grooves 17, 17, 17.
. Thus~ the above-described embodiment of cross-linear bearing unit is so constructed as to be able to support a tensile load applied in the direction where the bearing body 1 separates from the race bar 2. In Fig. 3 showing an example , of using four bearing bodies 1, 1, 1, 1, two of them are mounted on each of two parallel rails 12, 12 provided on a bed ~, 20, and two parallel race bars 2, 2 are fitted into the bearing ~, bodies 1, 1, 1, 1 with a slide base 21 attached fixedly to the :~
race bars 2, 2 so as to be slid vertically and horizontally.
. And when the slide base 21 is slid leftward or rightward, a :~:
pressure load is applied to the bearing bodies 1, 1 located on one rail 12, while a tensile load is applied to the bearing bodies 1, 1 on the other rail 12. In this case, each bearing body 1 is capable of supporting with certainty the load resulting from the slide base 21, hence offering a remarkably wi~e scope of application and great conveniences in practical ~ j use.
:~ ¦ It is to be understood that the cross-linear bearing unit ~, 30 ¦ of the present invention is not restricted merely to the ., .,, ',' ,1 , ',l I
108~;8~7 aforementioned embodiment and exemplary use illustrated where the positions of the raceway and the rail hole are orthogonal with each other, and the intersection angle thereof is selecta-' ble as desired. In this case, the intersection angle of the .;~ race bar and the rail is determined in accordance with that of :~ the raceway and the rail hole formed in the bearing body.
,. Furthermore, it is also possible to incline either the , raceway or the rail hole in the bearing body along its longitudinal direction and to position the slide base along the 1- inclined s~ face.
_ 7 _
'' . , ~ ,,, 108~8(~7 bearings are disposed at horizontal and vertical positions.
Summa and Ob ect of the Invention It is an object of an aspect of the present invention to provide a cross-linear bearing unit which is capable of achieving accurate positioning of a slide member mounted on a race bar by linearly moving the slide member in both vertical and horizontal directions, wherein the load-carry-ing capacity of a bearing body is increased, and the space between the race bar and a rail fitted respectively into a raceway and a rail hole can be minimized.
In accordance with one aspect of this invention there is provided a cross-linear bearing arrangement for support-ing and slide-moving a heavy load in two orthogonal directions, comprising: a) a flat bed for supporting the bearing arrangement and the load thereon; b) first and second parallel rails supported over said bed by bearing members; c) first, second, third and fourth bearing bodies extending outward and perpendicular to said flat bed, each said bearing body having an outer end and said bearing bodies respectively having a first, second, third and fourth rail hole extending through an inner portion thereof, said first rail passing through said first and second rail holes, said second rail passing through said third and fourth rail holes, said rail holes having grooves therein - and defining a load track and a return track in each said rail hole; d) first bearing balls disposed in said grooves;
e) an annular retainer disposed in each of said rail holes serving to hold, from out of said balls certain b~lls as loaded balls which are rolled while being kept in contact with both the load track of said bearing body and a load track surface of said rail, said retainer also serving to ^'~' ' " ' ' ' ' hold non-loaded balls so that said ~alls roll freely in said return track of said bearing body; f) first, second, third and fourth open raceways defined at the outer ends of each of said bearing bodies; g) first and second parallel race bars, said first race bar being disposed in said first and third raceways, said second race bar being disposed in said second and fourth raceways; h) loaded guide grooves of sub-stantially U-shape configuration in each said raceway and unloaded guide grooves adjacent each of ~aid loaded guide grooves defining a load track and a return track, respective-ly; i) second bearing balls held in each said raceway and a U-shaped re~ainer means in each said raceway for holding said second bearing balls, said retainer means serving to select, from among said second bearing balls in said raceway,load-ed balls, which are kept in contact with both the load track of said bearing body and a load track surface of said race bar and also serving to hold unloaded ones of said second ~-bearing balls to roll freely in said return track-of said bearing body; and j) a flat ~ide back mounted on said first and second race bars.
B ief Description of the Drawings Fig. 1 is a partially cutaway front view of a cross-linear bearing unit according to the present invention; Fig.
2 is a sectional view taken along the line II-II in Fig. l;
and Fig. 3 is a perspective view illustrating how the bear-ing unit of Fig. 1 is employed.
Detailed Describtion of the Invention Hereinafter an exemplary embodiment of the present invention will be described in detail with reference to the 30 accompanying drawings. .
As shown in Figs. 1 and 2, a raceway 3 where a race bar 2 -3a-,~
, ", .. . . . . ..
. . .
.
is fittable is formed on one side of a bearing body 1, and a rail hole 13 where a rail 12 is fittable is formed in the manner to pierce through the bearinq body 1 in the direction orthogonal with the raceway 3.
The raceway 3 in the bearing body 1 is equipped with loaded-ball guide grooves 7, 7 having a substantially U-shaped cross section and constituting a load track where loaded balls Sa, 5a are rollable in two rows, a nonloaded-ball guide grooves 8 formed between the guide grooves 7, 7 and having a substantia-lly U-shaped cross section and constituting a return track where nonloaded balls 5b, 5b are rollable in two rows, and grooves formed outside of the guide grooves 7, 7 and constitut-ing a return track where the nonloaded balls 5b are rollable in one row. The ends of the load-track grooves 7, 7 are connected respectively to the adjacent nonloaded-track grooves 8, 8, 8 so as to permit circulation of the balls.
The cross-sectional shape of the race bar 2 fittable into the raceway 3 in the bearing body 1 is uniform over the entire length and is symmetrical with respect to its left and right.
On shoulders 4, 4 of the race bar 2, rolling grooves 6, 6 for the loaded balls Sa, 5a are formed in the longitudinal direction at positions opposite to the nonloaded-track grooves 7, 7 of the raceway 3 in the bearing body 1, thereby constituting a rolling path for the loaded balls 5a, 5a through mutual cooperation. Along two sides of the race bar 2, recesses 11, 11 are formed in the longitudinal direction thereof correspond-ingly to the grooves 8, 8 which constitute the return track in the bearing body 1.
The balls are held in the raceway 3 of the bearing body 1 ~¦by a reta ner 9 in such a manner that the loaded balls Sa, Sa ll - 4 -` iO8~807 , .. re rolled into the retllrn-track grooves 8, ~, 8 while being~
kept in contact with the guide groov~s 7, 7 constituting the load track in the bearing body 1 and also with the rolling grooves 6, 6 .... formed in the race bar 2, meantime the unloaded balls 5b, 5b ... are rolled freely in the return-track grooves 8, 8, 8 of the bearing body 1 and are returned smoothly into the load-track grooves 7, 7.
The rail hole 13 formed in the bearing body 1 is equipped with loaded-ball guide grooves 17, 17, 17 having a substantially U-shaped cross section with a relatively small depth from the inner-diameter surface thereof and constituting a load track where loaded balls 15a, 15a are rollable in two rows, and nonloaded-ball guide grooves 18, 18, 18 having a substantially U-shaped cross section with a larger width and a relatively small depth from the inner-diameter surface and constituting a return track where nonloaded balls 15b, 15b are rollable in two rows. ~he bol:h guide grooves are arrayed alternately in the axial direction, and the ends of the load-track guide grooves 17, 17, 17 are connected respectively to the adjacent nonloaded-track guide grooves 18, 18, 18 so as to permit circulation of the balls.
The rail 12 fittable into the rail hole 13 in the bearing body 1 serves also as a spline shaft, whose cross-sectional shape is uniform over the entire length and is substantially triangular with swells and protrusions 23, 24, 25. And the two sides of each vertex of the triangle, rolling grooves 16, 16 for the loaded balls 15a, 15a are formed in the longitudinal direction thereof at positions opposite to the load-track guide groove 17 of the rail hole 13 in the bearing body 1, thereby constituting a rolling path for the loaded balls 15a, 15a I - _5_ Il .
through mutual cooperation.
The balls a~e held in the rail hole 13 of the bearing body 1 by a retainer 19 in such a manner that the loaded balls lSa, . 15a ..... are rolled into the return-track guide grooves 18, .~ 5 18, 18 while being kept in contact with the guide grooves 17, ,,, 17, 17 constituting the load track in the bearing body 1 and also with the rolling grooves 16, 16 ...... formed in the rail 12, meantime the unloaded balls 15b, 15b are rolled freely in the return-track guide grooves 18, 18, 18 of the bearing body 1 and are returned smoothly into the load-track guide grooves 17, 17, 17.
. Thus~ the above-described embodiment of cross-linear bearing unit is so constructed as to be able to support a tensile load applied in the direction where the bearing body 1 separates from the race bar 2. In Fig. 3 showing an example , of using four bearing bodies 1, 1, 1, 1, two of them are mounted on each of two parallel rails 12, 12 provided on a bed ~, 20, and two parallel race bars 2, 2 are fitted into the bearing ~, bodies 1, 1, 1, 1 with a slide base 21 attached fixedly to the :~
race bars 2, 2 so as to be slid vertically and horizontally.
. And when the slide base 21 is slid leftward or rightward, a :~:
pressure load is applied to the bearing bodies 1, 1 located on one rail 12, while a tensile load is applied to the bearing bodies 1, 1 on the other rail 12. In this case, each bearing body 1 is capable of supporting with certainty the load resulting from the slide base 21, hence offering a remarkably wi~e scope of application and great conveniences in practical ~ j use.
:~ ¦ It is to be understood that the cross-linear bearing unit ~, 30 ¦ of the present invention is not restricted merely to the ., .,, ',' ,1 , ',l I
108~;8~7 aforementioned embodiment and exemplary use illustrated where the positions of the raceway and the rail hole are orthogonal with each other, and the intersection angle thereof is selecta-' ble as desired. In this case, the intersection angle of the .;~ race bar and the rail is determined in accordance with that of :~ the raceway and the rail hole formed in the bearing body.
,. Furthermore, it is also possible to incline either the , raceway or the rail hole in the bearing body along its longitudinal direction and to position the slide base along the 1- inclined s~ face.
_ 7 _
Claims
1. A cross-linear bearing arrangement for supporting and slide-moving a heavy load in two orthogonal directions, comprising: a) a flat bed for supporting the bearing arrange-ment and the load thereon; b) first and second parallel rails supported over said bed by bearing members; c) first, second, third and fourth bearing bodies extending outward and perpen-dicular to said flat bed, each said bearing body having an outer end, and said bearing bodies respectively having a first, second, third and fourth rail hole extending through an inner portion thereof, said first rail passing through said first and second rail holes, said second rail passing through said third and fourth rail holes, said rail holes having grooves therein and defining a load track and a return track in each said rail hole; d) first bearing balls disposed in said grooves; e) an annular retainer disposed in each of said rail holes serving to hold, from out of said balls certain balls as loaded balls which are rolled while being kept in contact with both the load track of said bearing body and a load track surface of said rail, said retainer also serving to hold non-loaded balls so that said balls roll freely in said return track of said bearing body; f) first, second, third and fourth open raceways defined at the outer ends of each of said bearing bodies; g) first and second parallel race bars, said first race bar being disposed in said first and third raceways, said second race bar being disposed in said second and fourth raceways; h) loaded guide grooves of substantially U-shape configuration in each said raceway and unloaded guide grooves adjacent each of said loaded guide grooves defining a load track and a return track, respectively; i) second bearing balls held in each said raceway and a U-shaped retainer means in each said raceway for holding said second bearing balls, said retainer means serving to select, from among said second bearing balls in said raceway, loaded balls, which are kept in contact with both the load track of said bearing body and a load track surface of said race bar and also serving to hold unloaded ones of said second bearing balls to roll freely in said return track of said bearing body; and j) a flat slide back mounted on said first and second race bars.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14271777A JPS5476745A (en) | 1977-11-30 | 1977-11-30 | Cross linear bearing unit |
| JP142717/77 | 1977-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1086807A true CA1086807A (en) | 1980-09-30 |
Family
ID=15321931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA311,817A Expired CA1086807A (en) | 1977-11-30 | 1978-09-21 | Cross-linear bearing unit |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5476745A (en) |
| CA (1) | CA1086807A (en) |
| DE (1) | DE2838481C2 (en) |
| GB (1) | GB2009337B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5597518A (en) * | 1979-01-20 | 1980-07-24 | Hiroshi Teramachi | Endless sliding ball spline bearing |
| JPS588984Y2 (en) * | 1980-02-06 | 1983-02-18 | 博 寺町 | Linear ball bearing unit |
| JPS56124725A (en) * | 1980-03-05 | 1981-09-30 | Nippon Seiko Kk | Track guide type direct acting bearing device |
| JPS57114032A (en) * | 1980-12-29 | 1982-07-15 | Hiroshi Teramachi | Torque transfer type bearing block |
| JPS6014618A (en) * | 1983-07-04 | 1985-01-25 | Hiroshi Teramachi | Cross linear bearing unit |
| GB2175964B (en) * | 1985-05-14 | 1989-07-05 | Francis V Mutolo | Linear motion bearing and shafts |
| JPS6228146A (en) * | 1985-07-26 | 1987-02-06 | Hiroshi Teramachi | X-y table with linear motor |
| EP0297402A1 (en) * | 1987-06-26 | 1989-01-04 | Egis S.A. | Cross-slide, particularly for machine tools |
| GB8716820D0 (en) * | 1987-07-16 | 1987-08-19 | Drury Machinery Co | Milling machine |
| JP7130221B2 (en) * | 2016-06-30 | 2022-09-05 | 国際計測器株式会社 | Vibrator |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3003828A (en) * | 1957-06-25 | 1961-10-10 | James A Stark | Recirculating bearing |
| FR1350657A (en) * | 1962-09-13 | 1964-01-31 | Star Kugelhalter Gmbh Dt | Bearing intended in particular for machine components with linear displacement |
| US3341262A (en) * | 1964-12-21 | 1967-09-12 | Scully Jones Company | Recirculating bearing |
| US3450447A (en) * | 1967-03-01 | 1969-06-17 | Francis E Hacker | Antifriction bearing assembly |
| US3688642A (en) * | 1970-08-13 | 1972-09-05 | Anellux Systems Corp | Pattern guide system |
| JPS5322210B2 (en) * | 1971-09-13 | 1978-07-07 | ||
| US4005913A (en) * | 1975-01-08 | 1977-02-01 | Thomson Industries, Inc. | Linear motion bearing block |
| US4040679A (en) * | 1975-02-28 | 1977-08-09 | Hiroshi Teramachi | Slide way bearing |
| JPS5243973A (en) * | 1975-10-03 | 1977-04-06 | Tokyo Shibaura Electric Co | Wire wrapping wiring system |
| JPS5343158A (en) * | 1976-09-30 | 1978-04-19 | Hiroshi Teramachi | Crossed linear bearing |
-
1977
- 1977-11-30 JP JP14271777A patent/JPS5476745A/en active Granted
-
1978
- 1978-09-04 DE DE2838481A patent/DE2838481C2/en not_active Expired
- 1978-09-21 CA CA311,817A patent/CA1086807A/en not_active Expired
- 1978-10-12 GB GB7840313A patent/GB2009337B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2009337B (en) | 1982-08-04 |
| JPS5740372B2 (en) | 1982-08-27 |
| DE2838481A1 (en) | 1979-05-31 |
| GB2009337A (en) | 1979-06-13 |
| DE2838481C2 (en) | 1984-10-31 |
| JPS5476745A (en) | 1979-06-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |