CN100538118C - Ball screw device - Google Patents
Ball screw device Download PDFInfo
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- CN100538118C CN100538118C CNB2005800444410A CN200580044441A CN100538118C CN 100538118 C CN100538118 C CN 100538118C CN B2005800444410 A CNB2005800444410 A CN B2005800444410A CN 200580044441 A CN200580044441 A CN 200580044441A CN 100538118 C CN100538118 C CN 100538118C
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- Prior art keywords
- fixed block
- pipeline fixed
- connectedness
- nut
- ball screw
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- 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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
- F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
In order to be fastened to recurrent canal on the nut for certain and easily and to prevent recurrent canal perk and expansion when the circulatory troubles of ball occurs.Ball screw device comprises: screw axis comprises the screw axis groove that forms on its outer surface; Nut, be included in form on its internal surface with the relative nut groove of above-mentioned axle groove; Load path is formed by described axle groove and nut groove; A plurality of balls are rotatably installed in the described load path; Connectedness, the two ends that are communicated with described load path are being directed to ball the outside of nut, and this connectedness comprises curved section; The pipeline fixed block is fixed to described connectedness on the nut; And reinforcer, bear and affact the power on the described connectedness curved section and be arranged on the outer surface of described pipeline fixed block.
Description
Technical field
The present invention relates to a kind of ball screw (ball screw) device; this device is used for using at feed mechanism; location, transmission and power that this feed mechanism is used for the mobile stand of machining tool, industrial machine, semiconductor-fabricating device, injector, metal stamping (metal stamping) machine, precision machinery etc. transmit; more specifically, relate to a kind of ball screw device that preferably is used in electric injector or the electric metal stamping press.
Background technique
Conventional ball screw device has been shown among Fig. 2.
In ball screw device 1, screw axis 3 and nut 6 be screwed joint each other, and screw axis 3 has spiral chute 2 on its outer surface, and nut 6 has the spiral chute 4 corresponding to this spiral chute 2 within it on the surface.
The spiral chute 2 of the spiral chute of nut 6 (screw groove) 4 and screw axis 3 is provided with relative to one another, makes to form the spiral load region between the two at this.A plurality of balls 5 as rolling element are rotatably installed in this load region.By the rotation of screw axis 3 (or nut 6), nut 6 (or screw axis 3) moves on axial direction by the rolling of ball 5 and moves.
A part of sidepiece of nut 6 is made flat.On this flat surface, form two circulation ports 7 that pass through at spiral chute 2 and 4 of a cover between the two, with on thread spindle 3.Be assemblied in by two ends in each of a cover circulation port 7 recurrent canal 8 of U-shaped, end along spiral chute 2 and 4 load region circuit ball 5 between the two from recurrent canal 8 enters (scoop up), and be directed to the outside of nut, thereby the other end from load region returns.Like this, formed ball circulation paths.
And, for recurrent canal 8 is fixed on the planar surface of nut 6, adopted the pipeline fixed block 9 shown in Fig. 3 and 4.By the tinsel metal stamping is made pipeline fixed block 9 with mass production cheaply.As shown in Figure 4, in the position at the close center of the lower surface of tinsel, wherein this tinsel is longer on the axial direction of nut 6, is assemblied in recurrent canal 8 and is formed obliquely along the axial direction of recurrent canal 8 with the groove 9a that compresses recurrent canal 8.The both sides of groove 9a are seat 9b, and screw is formed among this 9b by hole 9c.
The groove 9a of pipeline fixed block 9 is assemblied on the recurrent canal 8.Under this state, be fastened on the screw hole (not shown) on the planar surface that is formed on nut 6 by making the screw that passes the 9b screw 9d by hole 9c, recurrent canal 8 is fixed on the nut 6.
Return in the cast ball screw device in above-mentioned routine, in use owing to the alignment error of for example spiral ball or the insufficient rigidity that the machine of ball screw device itself is installed, bigger transient load may occur and act on situation on the ball screw device, the speed of circulation of ball 5 changes in different positions, make ball 5 accumulate in the recurrent canal 8, thereby produce the power that ball 5 upwards promotes recurrent canal 8.If such masterpiece is used on the recurrent canal 8, the pipeline fixed block of being made by the tinsel metal stamping 9 trends towards being out of shape near the seat 9b place on the planar surface of nut 6, thereby recurrent canal 8 may perk (float up).
Concrete, the ball screw device that adopts in electric injector or electric metal stamping press needs high load-carrying ability, in order to increase load-carrying ability, is designed to as far as possible greatly for the ball diameter of screw axis diameter.In this case, when ball diameter was big, it is big that the circulation of ball 5 can also become.And the power that ball 5 upwards pushes away recurrent canal 8 also becomes greatly, thereby must improve the intensity of pipeline fixed block.
Need to improve under the situation of intensity at pipeline fixed block 9,, adopt the pipeline fixed block of making of solid steel (solid steel) processing as the measure that prevents recurrent canal 8 perks.But because this pipeline fixed block is made singly by machining, processing cost increases unfriendly.
Because ball diameter is big and circulating energy ball 5 is big, when the spiral roller unit was used for a long time, because concentrate (lodging) intermittence of the ball 5 in the recurrent canal 8, bigger than usual power acted on the pipeline fixed block by recurrent canal 8.As a result, recurrent canal 8 is because the distortion of pipeline fixed block or fracture and perk, thereby influenced the level and smooth circulation of ball 5.Can influence the operability of ball screw device so unfriendly.
And the ball screw device size of installing in the machine such as injector or metal stamping machine is relatively large and need high load, and this installs under high loading with the instantaneous operation of short stroke.That is, ball screw device uses under the mal-condition that moves back and forth usually, in a single day it just stops inverted running subsequently under maximum load.
So moving in the ball screw device that uses under the condition, because the insufficient rigidity of the machine of this ball screw device wherein is housed, the instantaneous deformation loading is between screw axis and nut.If ball screw device moves under the condition of instantaneous deformation loading, the speed of circulation of ball changes in load path, makes ball concentrate in the communication path, forms " ball is concentrated (ball lodging) ".As a result, make power that communication path stretches to the left and right and the masterpiece that communication path upwards pushes away is used on the communication path (these power be called " expansive force).
And the communication path of ball screw device forms the U-shaped of locating to have curved section at 2, locates ball at these 2 and enters and turn back to load path via curved section, straight section and another curved section subsequently from load path.Therefore, if ball is concentrated, big expansive force acts on the curved section of communication path, and this power becomes maximum in communication path.
For fear of the influence of such expansive force, it is effective making the recurrent canal that constitutes communication path integrally formed by the bending metals pipe.But in this case, the bending metals pipe makes cost of production increase singly.Therefore, usually, recurrent canal forms by this way, i.e. separated into two parts on the loop direction of ball.
In being provided with the conventional ball screw device of recurrent canal divided into two parts, form load path with the nut groove relative on being formed on the nut internal surface with this groove by the thread spindle groove that is formed on the thread spindle outer surface; Utilization has the recurrent canal of crooked communication path and brings in the formation circulating path by engaging two of load path; And by making screw axis and nut screwed joint along a plurality of balls of circulating path circuit.When recurrent canal when the loop direction of ball is divided into two-part, this recurrent canal is formed by the pipe that a pair of two halves separate.The pipe that the middle body of this recurrent canal is clamped so that two halves are separated by the pipeline fixed block is pressed against each other, thus guarantee recurrent canal with respect to the expansion intensity of force that causes by ball (for example, seeing patent documentation 1).
Patent documentation 1: Japanese Utility Model has been examined and has been announced JP-UM-B-3097525 (the 4th page 0012 section to the 5th page 0022 section and accompanying drawing 4).
But, in above-mentioned prior art,, concentrate the bound fraction of the recurrent canal of the curved part office that produces maximum swelling power when occurring when ball and be forced to extend because the middle section of recurrent canal is clamped by the pipeline fixed block, hindered the circulation of ball.Therefore, occur circulatory troubles unfriendly, thereby may damage ball screw device.As a result, the lifetime of ball screw device.
Summary of the invention
Problem to be solved by this invention
Make the present invention to overcome above-mentioned these defectives.The purpose of this invention is to provide a kind of can be for certain and easily recurrent canal is fastened to the device of nut, prevent recurrent canal perk when the circulatory troubles of ball occurs, and guarantee the intensity of the curved section of recurrent canal separately.Another object of the present invention provides a kind of ball screw device that can have low-cost pipeline fixed block.
The method of dealing with problems
The present inventor has done the stress analysis of the pipeline fixed block that is used for the common metal stamping products, and the known groove that is assemblied in the recurrent canal and higher near the stress on the seat of nut that is applied to.Based on these understanding, make the present invention.
That is, to achieve these goals, according to a first aspect of the invention, provide a kind of ball screw device, having comprised:
Screw axis, this screw axis comprise the screw axis groove that forms on its outer surface;
Nut, this nut be included in form on its internal surface with the relative nut groove of above-mentioned axle groove;
Load path, this load path is formed by described axle groove and nut groove;
A plurality of balls, these a plurality of balls are rotatably installed in the described load path;
The two ends that connectedness, this connectedness are communicated with described load path are being directed to ball the outside of nut, and this connectedness comprises curved section;
The pipeline fixed block, this pipeline fixed block is fixed to described connectedness on the nut;
Along a plurality of balls of circulating path circuit that form by described load path and connectedness; And
Reinforcer, this reinforcer bear the power that affacts on the described connectedness curved section, and are arranged on the outer surface of described pipeline fixed block.
According to a second aspect of the invention, propose as first aspect present invention, preferred:
The pipeline fixed block comprises:
This pipeline fixed block is fastened to the seat of described nut;
Cover described connectedness and the approaching ridge that is parallel to this, and
Described reinforcer is arranged on this ridge at least.
According to a third aspect of the invention we, propose as first aspect present invention, preferred:
Described connectedness comprises the curved section of the rotating direction that is used to change ball, and
Described reinforcer is arranged on the curved part office near this connectedness.
According to a forth aspect of the invention, propose as first aspect present invention, preferred:
Described pipeline fixed block comprises:
Groove, described connectedness are assemblied in this groove;
Seat, this seat is near on described nut; And
Strengthening rib, thus this strengthening rib forms projection from least one the surface of described groove and seat.
According to a fifth aspect of the invention, propose as fourth aspect present invention, preferred:
The height of projection of described strengthening rib is 1/5 to 2 times of thickness of described pipeline fixed block.
According to a sixth aspect of the invention, propose as fourth aspect present invention, preferred:
Described pipeline fixed block is tinsel press process (press machining) product.
According to a seventh aspect of the invention, propose as sixth aspect present invention, preferred:
Described pipeline fixed block is handled through hermo-hardening.
According to an eighth aspect of the invention, propose as fourth aspect present invention, preferred:
Described pipeline fixed block is the synthetic resin injection-molded product.
According to a ninth aspect of the invention, propose as first aspect present invention, preferred:
Described connectedness forms by be divided into two-part at least parts along the ball-recirculation direction;
Described pipeline fixed block comprises communication path and the curved section that is formed on these communication path two ends; And
This pipeline fixed block comprises:
Cover this curved section and be assemblied on the described connectedness fitting recess and
Be arranged on the reinforcer on this curved section.
According to the tenth aspect of the invention, propose as ninth aspect present invention, preferred described connectedness is made by resin material.
According to an eleventh aspect of the invention, propose as ninth aspect present invention, preferred described connectedness is made by metallic material.
The stamped metal processed product that preferred described connectedness is a metallic material according to a twelfth aspect of the invention, is proposed as ninth aspect present invention.
According to a thirteenth aspect of the invention, propose as ninth aspect present invention, preferred described connectedness is the resin material injection-molded product.
According to a fourteenth aspect of the invention, propose as ninth aspect present invention, preferred described pipeline fixed block is a tinsel press process product.
According to a fifteenth aspect of the invention, propose as ninth aspect present invention, the stretching that preferred described pipeline fixed block is a metallic material forms product.
According to a sixteenth aspect of the invention, propose as first aspect present invention, preferred described reinforcer forms inhomogeneous shape on the outer surface of described pipeline fixed block, or piles up on the outer surface of described pipeline fixed block.
Advantage of the present invention
According to the present invention, the pipeline fixed block is fastened to recurrent canal on the nut, and is protruding integratedly on the plane of at least one on being assemblied in recurrent canal and the groove on the seat of close nut of strengthening rib.Therefore, the intensity of the groove of pipeline fixed block and seat can improve.Therefore, occur, also can prevent the recurrent canal perk even work as the circulatory troubles of ball.Therefore, thus the level and smooth circulation that can guarantee ball preferably keeps the operability of ball screw device.
And according to the present invention, the reinforcing section of use pipeline fixed block can be guaranteed the intensity of curved section.Therefore, make big expansive force act on the curved section in the communication path, can prevent that also the bound fraction of connectedness is forced to expand even work as concentrated the appearing at of ball, thus the life-span of having improved ball screw device.
And, because the pipeline fixed block can be made by tinsel metal stamping or synthetic resin injection molding, therefore can provide the pipeline that produces with large-scale low-cost fixed block.
Description of drawings
Fig. 1 is used to illustrate the perspective view that the recurrent canal that returns the cast screw of one embodiment of the present of invention is fastened to the pipeline fixed block of nut.
Fig. 2 returns the sectional view of cast ball screw device for typical routine.
Fig. 3 is the view of recurrent canal by the fastening ball screw device of conventional pipeline fixed block.
Fig. 4 is the perspective view that is used to illustrate conventional pipeline fixed block.
Fig. 5 is the top view according to second embodiment's ball screw device.
Fig. 6 is the sectional view according to second embodiment's ball screw device.
Fig. 7 is the top view according to second embodiment's pipeline fixed block.
Fig. 8 is the view that direction A sees from Fig. 7.
Fig. 9 is the side view that illustrates according to second embodiment's pipeline fixed block coupled condition.
Figure 10 is the sectional view that illustrates according to second embodiment's recurrent canal coupled condition.
Figure 11 is the sectional view according to another form of second embodiment's communication means.
Figure 12 is the top view according to the 3rd embodiment's pipeline fixed block.
Figure 13 is the view that direction B sees from Figure 12.
Figure 14 is the side view according to the 3rd embodiment's pipeline fixed block coupled condition.
Figure 15 is the top view according to the 4th embodiment's pipeline fixed block.
Figure 16 is the view that direction C sees from Figure 15.
Figure 17 is the side view according to the 4th embodiment's pipeline fixed block coupled condition.
Figure 18 is the perspective view according to the 4th embodiment's pipeline fixed block.
Description of reference numerals
1 ball screw device
2 spiral chutes (screw axis side)
3 screw axis
4 spiral chutes
5 balls
6 nuts
7 circulation ports
8 recurrent canals
10 pipeline fixed blocks
11 grooves
12
14,15 strengthening rib
101 ball screw devices
102 screw axis
103 grooves
104 nuts
The 104a planar surface
105 nut grooves
106 balls
107 recurrent canals
108 curved sections
109 bound fractions
110 pipeline fixed blocks
111 fitting recess
112 Screws
113 attachment holes
114
116 reinforcing sections
118 flanges
119 are communicated with piece
120 curved sections
121,122 strengthening rib
Embodiment
Embodiment 1
With reference now to accompanying drawing, the first embodiment of the present invention is described.Fig. 1 is for being fastened to the recurrent canal that returns the cast screw of one embodiment of the present of invention the perspective view of the pipeline fixed block of nut.Incidentally, present embodiment is different from the routine of earlier in respect of figures 2 and 3 explanations and returns the cast ball screw device, and its difference only is to be used for the pipeline fixed block of fastening recurrent canal.Therefore, this difference only is described, and will uses the reference character in Fig. 2 and 3 if desired.
Returning in the cast ball screw device of first embodiment of the invention, the two ends of recurrent canal 8 are assemblied in a pair of circulation port 7 of nut 6, use metallic conduit fixed block 10 that recurrent canal 8 is fastened to nut 6.Pipeline fixed block 10 is made by the metal stamping of tinsel.As shown in Figure 1, in the almost central position of the lower surface of tinsel, wherein this tinsel is longer on the axial direction of nut 6, is assemblied in the recurrent canal 8 with the groove 11 of pushing down recurrent canal 8 axial direction along recurrent canal 8 to be formed obliquely.The both sides of groove 11 are seat 12, are formed with screw in the seat 12 by hole 13.
In the present embodiment, strengthening rib 14 and 15 respectively integratedly metal stamping on the outer surface of groove 11 and seat 12.Incidentally, in the present embodiment, strengthening rib 14,15 forms by metal stamping, mold tunnel fixed block 10 simultaneously, but they also can form before or after pipeline fixed block 10 forms.
Strengthening rib 14 on groove 11 sides forms has relatively large width, and extends on the axial direction of recurrent canal 8 along this outer surface in the zone at the close center on the width direction of groove 11 outer surfaces.On the other hand, the strengthening rib 15 on seat 12 sides forms has relative width smaller, and the axial direction of the side upper edge nut 6 on present 12 the width direction extends.Two strengthening rib 15 that form on the seat 12 on the both sides of groove 11 are set to approach parallel separating on width direction, thereby on groove 11 sides strengthening rib 14 are clipped in the middle.
Now, the height of projection of each strengthening rib 14,15 is preferably 1/5 to 2 times of sheet thickness of pipeline fixed block 10.If the height of projection of strengthening rib 14,15 is less than 1/5 of the sheet thickness of pipeline fixed block 10, the intensity increment rate that strengthening rib is set be 10% or below, thereby can not obtain the effect of enough raising intensity.On the other hand, if the height of projection of strengthening rib 14,15 surpasses the twice of the sheet thickness of pipeline fixed block, the rising of strengthening rib is unexpected, makes to locate in the lower surface and the point of intersection between the pipeline fixed block of strengthening rib, stress in the press process is excessive, breaks thereby may produce.
And in the present embodiment, pipeline fixed block 10 is subjected to the hermo-hardening processing such as carburizing or nitriding.Like this, further improved the intensity of pipeline fixed block.
The groove 11 of pipeline fixed block 10 is assemblied on the recurrent canal 8.Under this state, be fastened to tapped hole (not shown) on the planar surface that is formed at nut 6 by hole 13 by the screw that screw 9d is passed a 9b, recurrent canal 8 is fixed on the nut 6.
As mentioned above, in the present embodiment, for the pipeline fixed block 10 that recurrent canal 8 is fastened to nut 6, thereby strengthening rib 14,15 is shaped integratedly from the convex outer surfaces of each groove 11, is assembled in the recurrent canal 8 and seat 12 that is resisted against on the nut 6.Owing to this reason, can increase the intensity of the pipeline fixed block 10 at groove 11 and seat 12 places.Therefore, occur, also can prevent the perk of recurrent canal 8 even work as the circulatory troubles of ball 5.As a result, can guarantee the level and smooth circulation of ball 5, thereby keep the operability of ball screw device ideally.Therefore, needing can be provided for the electric injector of high loadability or the ball screw device of electric pressing make-up machine.
And, because pipeline fixed block 10 is made by the metal stamping of tinsel, can provide pipeline fixed block 10 with low-cost mass production.
And, as long as having specific nut rotation, moves ball screw device, the weight of pipeline fixed block 10 is less than the pipeline fixed block by solid steel processing.Therefore, can reduce the elastic load of nut 6.
Incidentally, the invention is not restricted to this above-mentioned embodiment, but can in the scope that does not depart from spirit of the present invention, make suitable modification.
For example, in the above-described embodiments,, used the metal stamping product of tinsel as pipeline fixed block 10.Alternatively, pipeline fixed block 10 also can be an injection-molded product, so that service advantages same as described above to be provided.
And in the above-described embodiments, for example, single recurrent canal 8 is pushed down by single pipeline fixed block 10.But, not limit therewith, single pipeline fixed block can form the shape that can push down a plurality of recurrent canals.
In addition, material, shape, size, structure, quantity and the position etc. of the spiral chute of example, screw axis, nut, ball, circulation port, ball circulation paths, recurrent canal, pipeline fixed block, groove, seat and strengthening rib in the above-described embodiments are as long as be optionally and can realize that the present invention is just unrestricted.
With reference now to accompanying drawing,, ball screw device second to the 4th embodiment of the present invention is described.
Embodiment 2
Fig. 5 is the top view according to second embodiment's ball screw device.Fig. 6 is the sectional view according to second embodiment's ball screw device.Fig. 7 is the top view according to second embodiment's pipeline fixed block.Fig. 8 is the view that direction A sees from Fig. 7.Fig. 9 is the side view that illustrates according to second embodiment's pipeline fixed block coupled condition.Figure 10 is the sectional view that illustrates according to second embodiment's recurrent canal coupled condition.
In Fig. 5 and Fig. 6, reference character 101 expression ball screw devices.
The screw axis of reference character 102 expression ball screw devices 101.Screw axis 102 is the rod-like element such as the steel of alloyed steel.On the outer surface of screw axis 102, the axle groove 103 that half arc is approached in the cross section forms spirally with predetermined angle of lead (lead angle).
The nut of reference character 104 expression ball screw devices 101.Nut 104 is the cylindrical parts such as the steel of alloyed steel.On the internal surface of nut 104, with axle groove 103 relatively and have the cross section and approach the nut groove 105 of half arc and be formed with the angle of lead identical with axle groove 103.
Like this, the two ends of load path engage to form circulating path by communication path 107a, and ball 106 is along this circulating path circulation.
Utilize the tinsel press process to come crooked metallic material to form pipeline fixed block 110, shown in Fig. 7 and 8, thereby cover the whole length of the curved section 108 on the both sides of the communication path 107a that comprises recurrent canal 107, shown in Fig. 5 and 9 such as steel.Pipeline fixed block 110 is made of the fitting recess 111 that approaches the square-section, forms the outer surface of recurrent canal 107 by the pipe that separates in conjunction with two halves at bound fraction 109 places and this fitting recess; Shown in the double dot dash line among Fig. 8; And form the seat 114 that attachment hole 113 is arranged on it, in order to pass through Screw 112 as fastening piece.As shown in figure 10, the outer surface of the recurrent canal 107 that the pipe that is separated by the two halves of bound fraction 109 places combination constitutes is assemblied in the fitting recess 111, and pipeline fixed block 110 is connected in the surperficial 104a of nut 104.
Incidentally, the recurrent canal shown in Fig. 9 only shows its profile.
In the reference character 116 expression reinforcing sections one.Utilize the tinsel press process to approach U-shaped and produce reinforcing section 116 by being bent into such as the metallic material of steel disc.Reinforcing section 116 is arranged on the outside corresponding to the position of the curved section 108a of the communication path 107a of the recurrent canal 107 in the fitting recess 111 that is assemblied in pipeline fixed block 110.Reinforcing section 116 is formed on the pipeline fixed block 110 it by connecting such as bonding Placement.
The parallelogram that reinforcer 116 forms on perpendicular to the direction of the axial direction of nut 104 and the loop direction along ball 106 seen from Fig. 7 forms.Reinforcer 116 forms such shape makes its end not reach seat 114.
Incidentally, reinforcer 116 can pipeline fixed block 110 formed by stretching and form, thereby integrally formed with pipeline fixed block 110 when forming pipeline fixed block 110.
The technology of connection reinforcing section 116 is not limited to bonding, and can be any other connecting means, comprises the assembly method of using friction, welding, screwing etc.
In above-mentioned circulating path, be sealed with a plurality of balls 106 and such as the oiling agent of the prearranging quatity of lubricating grease.By rotating screw axle 102, ball 106 follows the endless path circulation and rotates on load path simultaneously, makes nut move on axial direction.Like this, the rotation of screw axis 102 is moved and is converted to straight line motion.
The operation of above-mentioned structure below will be described.
(half-divided) pipe that two halves separate is combined into single recurrent canal at bound fraction 109 places, be assemblied in the pilot hole that is communicated with nut groove 105 by the two ends with recurrent canal and be connected according to recurrent canal of the present invention, wherein this pilot hole is formed on the surperficial 104a of nut 104.After the fitting recess 111 of pipeline fixed block 110 was assembled on the outer surface of recurrent canal 107, Screw 112 passed the attachment hole 113 of seat 114 and is fastened on the surperficial 104a.Like this, recurrent canal 107 is fixed on the nut 104.
In this case, reinforcing section 116 is formed on the curved section 108 corresponding positions on the both sides of pipeline fixed block 110 and communication path 107a recurrent canal 107, thereby guarantees the intensity of curved section 108.Owing to this reason, even concentrating to appear at, ball make big expansive force act on the curved section 108 among the communication path 107a, the bound fraction 109 of recurrent canal 107 also can not expand under compulsion and therefore can not damage ball screw device 101.
And, because recurrent canal 107 forms in the mode of separating by stamped metal processing or injection molding, can promote the processing of recurrent canal 107, thereby reduce production costs.
Incidentally, do not need to be provided with the whole curved section 108 of reinforcing section 108 with the communication path 107a that covers recurrent canal 107.They only need be set to cover the curved section of a part.
Illustrated that the fitting recess 111 that is assemblied on the recurrent canal 107 covers the whole length of recurrent canal.But, do not need this fitting recess 111 to cover whole curved section 108 but can cover a part curved section 108.In a word, fitting recess 111 can have the length that reinforcing section 116 is formed.
As mentioned above, according to present embodiment, recurrent canal is divided into two-part along the loop direction of ball, and is assemblied in the fitting recess that is formed at the pipeline fixed block, makes the zone of the curved section on the both sides of the communication path reach recurrent canal be capped.And the reinforcing section that is formed in the pipeline fixed block is arranged on the curved section of recurrent canal.Like this, can guarantee the intensity of curved section by the reinforcing section of pipeline fixed block.Therefore, make big expansive force act on the curved section in the communication path, can prevent that also the bound fraction of recurrent canal from expanding, thereby realized the long life-span of ball screw device even ball is concentrated to appear at.
Incidentally, in the present embodiment, illustrated that communication means is a recurrent canal 107.But communication means is not limited to said structure, and can be the structure shown in Figure 11.
In Figure 11, reference character 119 expressions are as the connection piece of communication means.Be formed with the communication path 107a of the curved section 108 on the both sides with recurrent canal identical with above-mentioned recurrent canal 107.Sectional shape between the curved section 108 forms arc, and this arc approximates half arc of recurrent canal external diameter by diameter and the extension at the two end part on the tangent direction of this half arc constitutes.Sidepiece forms square, or the upper corner on the both sides approaches the shape of 1/4 arc, is similar to the profile of the recurrent canal 107 that dotted line is represented among Fig. 9.
And the two ends that are communicated with the communication path 107a of piece 119 form cylindrical, be assemblied in pilot hole that nut groove 105 on the surperficial 104a that is formed on nut 104 is communicated with in.Be similar to above-mentioned recurrent canal 107, recurrent canal forms along the loop direction of ball 106 structure divided into two parts in vertical direction.In conjunction with when forming single connection piece 119, their internal surface is as communication path 107a at bound fraction 109 places for the pipe that separates when these two halves.As shown in Figure 11, half arc on the both sides that are communicated with piece 119 and its top is fastened to recurrent canal on the surperficial 104a of nut 104 by pipeline fixed block 110 after being assemblied in the fitting recess 111 of pipeline fixed block 110.
When such connection piece 119 produced by using the resin material injection molding, this intercommunicating pore was effective.
Figure 12 is the top view according to the 3rd embodiment's pipeline fixed block.Figure 13 is the view that direction B sees from Figure 12.Figure 14 is the side view according to the 3rd embodiment's pipeline fixed block coupled condition.In these accompanying drawings, identical reference character represent with second embodiment in components identical.
In the pipeline fixed block 110 according to present embodiment, as shown in Figure 14, seat 114 is formed on the whole length of pipeline fixed block 110.Reinforcing section 116 is arranged on the curved section 108 corresponding positions with the communication path 107a of recurrent canal 107.As shown in Figure 12, when when the top is seen, they form by the axial direction of nut 104 and Vertical direction thereof form square.As shown in figure 13, their end reaches seat 114 along seat 114 bending section 120 to be set.
According to the such structure of pipeline fixed block, except reaching the effect identical, improved the rigidity of reinforcing section by a bending section that forms along seat, thereby can further improve the intensity of curved section with above-mentioned second embodiment.
Figure 15 is the top view according to the 4th embodiment's pipeline fixed block.Figure 16 is the view that direction C sees from Figure 15.Figure 17 is the side view according to the 4th embodiment's pipeline fixed block coupled condition.
Incidentally, in the present embodiment, same reference character represent with the 3rd embodiment in components identical.
In the pipeline fixed block 110 according to present embodiment, seat 114 is formed on the whole length of pipeline fixed block 110.As shown in Figure 17, reinforcing section 116 is arranged on the curved section 108 corresponding positions with the communication path 107a of recurrent canal 107.As shown in Figure 15, when when the top is seen, they form by the loop direction of ball 106 and Vertical direction thereof form square.As shown in Figure 16, their end be formed with the 3rd embodiment in identical bending section 120.
According to such structure of pipeline fixed block, can obtain the effect identical with the 3rd embodiment.
Figure 18 is the perspective view according to the 4th embodiment's pipeline fixed block.
In this structure, the sectional shape of fitting recess 111 forms arc, and this arc approximates half arc of recurrent canal external diameter by diameter and the extension at the two end part on the tangent direction of this half arc constitutes.
And, as shown in Figure 18, pipeline fixed block 110 is provided with strengthening rib 121 and is formed on two strengthening rib 122 on the seat 114, and wherein this strengthening rib 121 is by utilizing the center region projection such as the fitting recess 111 of press process on the loop direction of ball 106.
As mentioned above, the arc section shape is set, and adds strengthening rib 121,122,, can also further improve the rigidity of pipeline fixed block 110 then except above-mentioned effect if fitting recess 111 forms.
Incidentally, in above-mentioned each embodiment, illustrated that recurrent canal is divided into two-part.But the quantity of the part that is divided into is not limited to two, and can be three or more.
And, in above-mentioned each embodiment, the screw axis by the swing roller screw being described, nut moves on axial direction.But in the time of in the present invention is applied to by the ball screw device of swivel nut, screw axis moves on axial direction, can obtain identical effect.
In addition, by increasing the thickness of whole pipe fixed block, can bear the stress that acts on the recurrent canal.But, only increase the thickness of pressing section, the radius of curvature that has increased seat and wherein assembled the linkage section between the ridge of recurrent canal.If radius of curvature increases, the contact position relative with nut of seat separates with recurrent canal, and the feasible bolt that is used for fastening pipeline fixed block separates with recurrent canal.As a result, push away the rigidity of the fastening part on the direction of recurrent canal on can not improving.
And the area that supports the ridge of recurrent canal reduces, thereby can not improve the rigidity that makes recurrent canal open/expand.Therefore, the thickness that only increases the pipeline fixed block has reduced the ability of pipeline fixed block restriction nut and the ability of pipeline fixed block restriction recurrent canal.
On the other hand,, be arranged on this structure on the outer surface of pipeline fixed block according to reinforcing section, can bear the stress that acts on the recurrent canal and can guarantee restriction recurrent canal as described in the present invention.
Understand the present invention specifically with reference to certain embodiments.But, it will be apparent for a person skilled in the art that under situation without departing from the spirit and scope of the present invention and can make various forms of modifications and improvement the present invention.
The present invention is based on Japanese patent application of submitting on December 22nd, 2004 (number of patent application 2004-370818) and the Japanese patent application of submitting on August 9th, 2005 (number of patent application 2005-231250), its content is combined in herein as a reference.
Industrial applicibility
According to the present invention, even when the circulation of ball is broken down, can prevent that still recurrent canal from sticking up Rise, thereby can guarantee the level and smooth circulation of ball, preferably to keep grasping of ball screw device The property done.
And, according to the present invention, even concentrating, ball appears in the communication path so that big swollen Swollen masterpiece is used on the crooked part, also can the switching power parts be forced to expand in conjunction with part, Thereby increase the life-span of ball screw device.
And, owing to can make pipe by the metal punching press of sheet metal or the injection molding of synthetic resin The road fixture can provide the pipeline fixer with low-cost large-scale production.
Claims (14)
1. ball screw device comprises:
Screw axis, this screw axis comprise the screw axis groove that forms on its outer surface;
Nut, this nut be included in form on its internal surface with the relative nut groove of above-mentioned axle groove;
Load path, this load path is formed by described axle groove and nut groove;
A plurality of balls, these a plurality of balls are rotatably installed in the described load path;
The two ends that connectedness, this connectedness are communicated with described load path are being directed to ball the outside of nut, and this connectedness comprises curved section;
The pipeline fixed block, this pipeline fixed block is fixed to described connectedness on the nut;
Along a plurality of balls of circulating path circuit that form by described load path and connectedness; And
Reinforcer, this reinforcer bears the power on the curved section that affacts described connectedness, and is arranged on the outer surface of described pipeline fixed block,
Wherein said pipeline fixed block comprises:
Groove, described connectedness are assemblied in this groove;
Seat, this seat is near on described nut; And
Strengthening rib, this strengthening rib forms, thereby from least one the surface of described groove and seat projection,
And wherein, the height of projection of described strengthening rib is 1/5 to 2 times of thickness of described pipeline fixed block.
2. ball screw device as claimed in claim 1, wherein said pipeline fixed block comprises:
This pipeline fixed block is fastened to the seat of described nut;
Cover described connectedness and the approaching ridge that is parallel to this, and
Described reinforcer is arranged on this ridge at least.
3. ball screw device as claimed in claim 1, wherein
Described connectedness comprises the curved section of the rotating direction that is used to change ball, and
Described reinforcer is arranged on the curved part office near this connectedness.
4. ball screw device as claimed in claim 1, wherein
Described pipeline fixed block is a tinsel press process product.
5. ball screw device as claimed in claim 4, wherein
Described pipeline fixed block is handled through hermo-hardening.
6. ball screw device as claimed in claim 1, wherein
Described pipeline fixed block is the synthetic resin injection-molded product.
7. ball screw device as claimed in claim 1, wherein
Described connectedness is divided into two-part at least parts by the loop direction along ball and forms;
Described pipeline fixed block comprises communication path and the curved section that is formed on these communication path two ends; And
This pipeline fixed block comprises:
Cover this curved section and be assemblied on the described connectedness fitting recess and
Be arranged on the reinforcer on this curved section.
8. ball screw device as claimed in claim 7, wherein said connectedness is made by resin material.
9. ball screw device as claimed in claim 7, wherein said connectedness is made by metallic material.
10. ball screw device as claimed in claim 7, wherein said connectedness are the stamped metal processed product of metallic material.
11. ball screw device as claimed in claim 7, wherein said connectedness are the injection-molded product of resin material.
12. ball screw device as claimed in claim 7, wherein said pipeline fixed block are tinsel press process product.
13. ball screw device as claimed in claim 7, the stretching that wherein said pipeline fixed block is a metallic material forms product.
14. ball screw device as claimed in claim 1, wherein said reinforcer form inhomogeneous shape on the outer surface of described pipeline fixed block, or pile up on the outer surface of described pipeline fixed block.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004370818A JP4860916B2 (en) | 2004-12-22 | 2004-12-22 | Ball screw device |
| JP370818/2004 | 2004-12-22 | ||
| JP231250/2005 | 2005-08-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101087968A CN101087968A (en) | 2007-12-12 |
| CN100538118C true CN100538118C (en) | 2009-09-09 |
Family
ID=36731709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800444410A Expired - Fee Related CN100538118C (en) | 2004-12-22 | 2005-12-21 | Ball screw device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4860916B2 (en) |
| CN (1) | CN100538118C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4957387B2 (en) * | 2007-05-30 | 2012-06-20 | 日本精工株式会社 | Ball screw mechanism assembly method and processing apparatus |
| CN102966711B (en) * | 2009-08-05 | 2015-06-10 | 上银科技股份有限公司 | External circulation type ball screw with muffling structure |
| CN102454757B (en) * | 2010-10-18 | 2013-09-04 | 上银科技股份有限公司 | Roller threaded rod |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2415208Y (en) * | 2000-03-22 | 2001-01-17 | 上银科技股份有限公司 | Ball-screw with spacer |
| JP2002188705A (en) * | 2000-12-22 | 2002-07-05 | Ntn Corp | Ball screw |
| CN1107178C (en) * | 1996-06-21 | 2003-04-30 | Thk株式会社 | Ball screw apparatus |
| JP2004299449A (en) * | 2003-03-28 | 2004-10-28 | Koyo Seiko Co Ltd | Electric power steering device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4929620U (en) * | 1972-06-19 | 1974-03-14 | ||
| JPS5939352U (en) * | 1982-09-08 | 1984-03-13 | 黒田精工株式会社 | ball screw |
| JPH0828648A (en) * | 1994-07-22 | 1996-02-02 | Nippon Seiko Kk | External circulating type ball screw device |
| JP2003172422A (en) * | 2001-11-29 | 2003-06-20 | Shangyin Sci & Technol Co Ltd | Ball circulation pipe line for ball screw unit |
| JP2004169739A (en) * | 2002-11-18 | 2004-06-17 | Ntn Corp | Ball screw |
-
2004
- 2004-12-22 JP JP2004370818A patent/JP4860916B2/en active Active
-
2005
- 2005-12-21 CN CNB2005800444410A patent/CN100538118C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107178C (en) * | 1996-06-21 | 2003-04-30 | Thk株式会社 | Ball screw apparatus |
| CN2415208Y (en) * | 2000-03-22 | 2001-01-17 | 上银科技股份有限公司 | Ball-screw with spacer |
| JP2002188705A (en) * | 2000-12-22 | 2002-07-05 | Ntn Corp | Ball screw |
| JP2004299449A (en) * | 2003-03-28 | 2004-10-28 | Koyo Seiko Co Ltd | Electric power steering device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006177429A (en) | 2006-07-06 |
| CN101087968A (en) | 2007-12-12 |
| JP4860916B2 (en) | 2012-01-25 |
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