CN1740590A - Ball circulating member and ball screw - Google Patents
Ball circulating member and ball screw Download PDFInfo
- Publication number
- CN1740590A CN1740590A CNA2005101098506A CN200510109850A CN1740590A CN 1740590 A CN1740590 A CN 1740590A CN A2005101098506 A CNA2005101098506 A CN A2005101098506A CN 200510109850 A CN200510109850 A CN 200510109850A CN 1740590 A CN1740590 A CN 1740590A
- Authority
- CN
- China
- Prior art keywords
- ball
- path
- forms
- circulating member
- side cap
- 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.)
- Granted
Links
Images
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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
A side cap 17 is formed by two ball circulating member-forming members 23 and 23 divided from each other along a division line PL extending in a direction of advancing of balls 15 passing through the interior of the side cap. The side cap 17 includes ball scoop-up portions 24 each for scooping-up the balls 15 from a ball track passageway 8 at one side thereof, and a ball circulating passageway 27 (formed integrally with the ball scoop-up portions) for returning the balls 15 , scooped-up at the ball scoop-up portion 24 , to the ball track passageway 8 at the other side thereof. The side cap has notch portions 25 formed respectively at scoop-up proximal end portions 24 a thereof integrally connecting the ball scoop-up portions 24 respectively to the ball circulating passageway 27 . The division line PL is formed in such a position that it beforehand cuts the notch portion 25 at the one side and the notch portion 25 at the other side.
Description
Technical field
The present invention relates to the ball screw that in various industrial machines etc., uses.
Background technique
As shown in figure 10, this ball screw 100 comprises: thread spindle 12, this has the spiral ball rolling groove that forms at its external peripheral surface and in axial direction extend.Nut 14, this nut have (corresponding with the ball rolling groove in the thread spindle) the spiral ball rolling groove that forms in the circumference within it, and nut 14 is assemblied on the thread spindle 12.The ball rolling groove of nut 14 and the ball rolling groove of thread spindle 12 toward each other, thereby form ball orbit path 8 between them.A plurality of balls 15 (as rolling member) rollably are arranged in the ball orbit path 8.
In recent years, the ball screw of described type has been used the ball circulating member type widely, wherein circulate smoothly (promptly in order to ensure ball, for the ball that will roll in spiral ball orbit path imports ball circulating member smoothly, and the ball that moves in the ball circulating member is returned the ball orbit path smoothly), along mentioning ball with the tangent direction of ball orbit path, and along making ball turn back to ball orbit path (for example referring to patent documentation 1) with the tangent direction of ball orbit path.
For example, in the ball screw of described type, as shown in figure 10, the fixed surface 16 of ball circulating member (formed or set by the plane) forms on the outer surface of nut 14.Pair of notches 20 forms on the fixed surface 16 of ball circulating member, and these otch 20 are communicated with ball orbit path 8.Ball circulating member 170 is fixed on (for example referring to patent documentation 2) on these ball circulating member fixed surfaces 16.
[patent documentation 1]
JP-A-2003-232421
[patent documentation 2]
JP-A-2005-083519 (corresponding to U.S. Patent Publication No.US2005/0087031A1)
As shown in figure 10, ball circulating member 170 have its middle body of Zai to both sides Xing respectively The a pair of leg section that becomes divides 190. As shown in figure 11, leg section divides 190 for ball circulating member 170 the fixed angle of middle body Yi rightabout inclination Yu, just Yu the importing angle of thread spindle 12 Xiang couple of Yi Ying. Zhe to leg section divide 190 can Yan perpendicular to the direction of thread spindle 12 respectively closely Zhuan be fitted on (the fixed surface 16 Zhong Xing of Zai ball circulating member become) otch 20 Zhong.
This ball circulating member 170 can for example use synthetic resin Zhi to become, and by rolling a pair of The Xing of Zhu circulating member becomes member 230 to be combined with 230 Zus and Xing becomes, as shown in figure 11. That is, Yong Yu make ball 15 Zai wherein the ball-recirculation path Xing of Xun ring be formed in the inside of ball circulating member 170, And ball circulating member 170 comprises cut-off rule by a pair of Yan (Yan rolling of ball circulating member 170 Zhong The direction of advance Yan of Zhu 15 stretches) the side cap Xing that separates each other becomes member 230 and 230. Figure 11 Zhong's Reference numeral PL ' expression cut-off rule, ball circulating member 170 Yan this cut-off rule and are divided into two side caps Xing becomes member 230.
Can advise, according to the mobile route of ball 15 Zhong Xin cut-off rule PL ' is set. That is, work as cut-off rule PL ' is arranged at Zhe Wei Zhi place and ball circulating member 170 is divided into a pair of side cap Xing one-tenth member 230 With 230 o'clock, two ball circulating member Xing become member 230 basically equally Wei around or surround ball 15 Yuan Zhou, and think that Yin this this split position is desirable and Zai Yue bundle ball 15 stably Function aspects be You Xiao.
Yet usually, ball circulating member 170 has the ball of Zai ball circulating member 170 and mentions (scooping-up) ball that (returns) the terminal part office Xing one-tenth of path 210 is mentioned part 240, as Shown in Figure 12. Thereby mentioning the Xing Zhuan that part 240 has ligule, ball make it can be inserted into thread spindle 12 Ball rolling groove 11 Zhong, Yi mentions successfully from ball orbit path 8 just that (the Zai ball orbit is logical Road 8 Zhong roll) ball 15, and import to ball and mention (returning) path 210 Zhong. Ball is mentioned Part 240 is mentioned (returning) path 210 from ball and is stretched out towards the ball rolling groove. Yin this, notch Divide 250 Xing to be formed in to mention part 240 Yu ball and ball mentions that (returning) path 210 Xiang connects Mention proximal part 240a, slot-open-section 250 can be the V-shaped groove of acute angle for example.
Therefore, when along the whole length of as shown in figure 12 ball circulating member 170 cutting lines PL ' time being set according to the mobile route (representing) at ball center by the line BCD among Figure 12, slot-open-section 250 is retained in mentions proximal part 240a place (referring to the F ' part among Figure 12), as shown in figure 13.
Promptly, only be set under the situation of this position at the cutting lines PL ' that mentions proximal part 240a place, when ball screw 100 has load repeatedly to be applied to ball during high speed rotating to mention on the part 240, because intensive stress, the slot-open-section 250 of mentioning proximal part 240a place has become damaged starting point, and fears are entertained that, and this can become the reason that hinders high speed design.
In addition, shown in Figure 16 A, ball circulating member 170p is fixed on the fixed surface 16p of ball circulating member.
This ball circulating member 170p can for example use synthetic resin to make, and combines and form by a pair of ball circulating member being formed member 230p and 230p, shown in Figure 16 A.Ball-recirculation path 27p is formed at ball circulating member 170p inside, shown in Figure 16 B.Ball-recirculation path 27p comprises a pair of path of navigation 21p that sentences continuous with it relation formation respectively at the relative two ends of central corridor 22p.Path of navigation 21p is formed or is set by the periphery wall around these path of navigation 21p respectively, and these periphery walls form a pair of supporting leg part 190p (referring to Figure 16 A) respectively.
Shown in Figure 16 A and 16B, thereby it is corresponding with the importing angle of thread spindle 12p that a pair of supporting leg part 190p tilts with predetermined angle in opposite direction with respect to central corridor 21p, and these supporting leg parts 190p forms in the mode of three-dimensional with the path of navigation 22p that wherein forms.This can closely be assembled to respectively along the direction perpendicular to thread spindle 12p among (forming in the fixed surface 16p of ball circulating member) ball circulating member fixed hole 20p supporting leg part 190p.In Figure 16 A, the mobile route that ball 15p moves in ball-recirculation path 27p is represented to C by arrow A with three dimensional constitution.
Yet this ball circulating member 170p forms following structure, and promptly a pair of supporting leg part 190p can closely be assembled to respectively among the ball circulating member fixed hole 20p along the direction perpendicular to thread spindle 12p as mentioned above.Therefore, thicker part (being represented by reference character D among Figure 16) part is formed at each supporting leg part 190p place.Therefore, the thickness of ball circulating member 170p is uneven on its whole length.Therefore, the casting material of product on whole length of casting during the casting operation shrinks inhomogeneous, therefore is difficult to improve the accuracy of the ball-recirculation path that forms in ball circulating member 170p inside.
In addition, when mold forms, must consider to be used to handle the corrective action of uneven gauge.In addition, run into a problem, promptly not interrupted for the smooth motion that makes the ball in the ball-recirculation path, need carry out some and measure, for example proofread and correct mold by the mode that increases ball-recirculation path internal diameter in advance.In addition, make under the situation that the internal diameter of ball-recirculation path becomes too big in this correction that is used for increasing in advance ball-recirculation path internal diameter, fears are entertained that ball is arranged in staggered mode in ball-recirculation path inside and is interfering with each other.Especially make when being made of resin as ball circulating member 170p, fears are entertained that can aggravation ball-recirculation path inside wearing and tearing.
Summary of the invention
Proposition of the present invention is exactly in order to address the above problem, an object of the present invention is to provide a kind of ball circulating member and ball screw, wherein can improve the intensity of mentioning proximal part of more weak relatively ball circulating member, therefore improve working at high speed performance and endurance quality.
In addition, another object of the present invention provides a kind of ball circulating member and ball screw, wherein can improve the accuracy at the inner ball-recirculation path that forms of ball circulating member.
According to the present invention in order to address the above problem as claimed in claim 1, a kind of ball circulating member that is used for ball screw is provided, this ball screw comprises thread spindle, described thread spindle has the ball rolling groove that forms in its external peripheral surface; Nut, described nut have the ball rolling groove that forms in its inner circumferential surface relative with the external peripheral surface of thread spindle; With a plurality of balls, described ball is arranged in the ball orbit path that forms between the ball rolling groove of nut and thread spindle; Described ball circulating member comprises: ball is mentioned part, and each ball is mentioned part and all is used for mentioning ball from a side of ball orbit path; The ball-recirculation path is used for and will mentions the opposite side that the ball of mentioning at the part place turns back to the ball orbit path at ball; Ball is mentioned part and the ball-recirculation path forms an integral body each other; Slot-open-section forms mentioning the close end office respectively, and integrally ball is mentioned part respectively and be connected to the ball-recirculation path; And two ball circulating members form member, they are separated each other along the cutting lines that extends on the direction of advance of the ball of ball circulating member inside, wherein, cutting lines is through the deepest part of the slot-open-section of a side, and the deepest part of the slot-open-section of process opposite side.
With regard to term " deepest part of slot-open-section ", when for example slot-open-section is V-shaped, the darkest part is the summit of V-arrangement, and when slot-open-section took the shape of the letter U or be semicircle, the darkest part was U-shaped or semicircular that part of to ball-recirculation path internal recess.
In the present invention as claimed in claim 1, cutting lines (ball circulating member is divided into two ball circulating members along this cutting lines and forms member) cutting in advance is formed at the slot-open-section that each mentions the close end office.Therefore, in fact slot-open-section is not formed at mentions the close end office, and the notch branch of mentioning the close end office that is formed at before this runs into the problem that stress is concentrated.Therefore, apply when impacting even mention part when (circuit in ball circulating member) ball to ball, the stress that also can reduce to mention on the proximal part is concentrated.Therefore, mentioning the possibility that the close end office begins fatigue failure weakens.Therefore, when this ball circulating member is used in the ball screw, can improve the working at high speed performance and the endurance quality of ball screw.
Cutting lines is preferably formed by mild line.The stress that like this, just can further reduce to mention on the proximal part is concentrated.Therefore, mentioning the possibility that the close end office begins fatigue failure just can more suitably weaken.
Ball circulating member as claimed in claim 1 can suitably reduce the stress of mentioning on the proximal part and concentrate.Yet the cutting lines in the above-mentioned position (at an end place of mentioning part away from ball) is mentioned part with respect to the mobile route deflection ball at ball center.That is, in the cut zone of mentioning the close end office, the periphery wall of two ball circulating member formation members surrounds ball unequally.Therefore, as the negative effect of this structure, there are following misgivings in people, promptly become unstable by the ability of mentioning near the periphery wall constraint ball the proximal part.Therefore, inventor of the present invention has in depth studied and can reduce the stress of mentioning on the proximal part and concentrate and can make and mention the restriction ability stable structure of proximal part vicinity to ball.Therefore, mention near the proximal part periphery wall and formed the resulting structure that can realize the ball restriction ability estimated.
Promptly, as the described ball circulating member of the present invention of the claim 2 that is subordinated to claim 1, it is characterized in that, two ball circulating members form member and all have the periphery wall extension of extending from periphery wall, and the periphery wall extension part of each ball circulating member formation member covers the opposite side of mentioning proximal part that the ball circulating member that is complementary forms member.
In the described the present invention of claim 2, though the periphery wall that determined split position makes two ball circulating members form member is mentioned proximal part at each and sentenced different ratios round ball, periphery wall is combined by this mode that one of periphery wall covers another periphery wall.Therefore, can make by the ability of mentioning near the periphery wall constraint ball the proximal part and become stable.
Ball screw of the present invention as claimed in claim 3 is characterized in that, this ball screw comprises as claim 1 or the described ball circulating member of claim 2.
In the present invention as claimed in claim 3, be provided with and realize as the running of claim 1 or the described ball circulating member of claim 2 and the ball screw of advantage.
In the present invention, provide a kind of ball circulating member and the ball screw that can improve working at high speed performance and endurance quality.In addition, proposition of the present invention is in order to address the above problem, and an object of the present invention is to provide a kind of ball circulating member and ball screw, wherein can improve the accuracy at the inner ball-recirculation path that forms of ball circulating member.
In addition, according to the present invention in order to address the above problem as claimed in claim 4, provide a kind of ball circulating member that is used for ball screw, this ball screw comprises thread spindle, and described thread spindle has the ball rolling groove that forms in its external peripheral surface; Nut, described nut have the ball rolling groove that forms in its inner circumferential surface relative with the external peripheral surface of thread spindle; With a plurality of balls, described ball is arranged in the ball orbit path that forms between the ball rolling groove of nut and thread spindle; Ball circulating member comprises: the ball-recirculation path of Xing Chenging therein be used for mentioning ball from a side of ball orbit path, and the ball that will mention turns back in the opposite side of ball orbit path; The ball-recirculation path comprises central corridor, and a pair of path of navigation is sentenced continuous with it mode in the relative end of central corridor respectively and is formed, wherein, the outer surface that forms each periphery wall of path of navigation respectively is arranged to basically to parallel with the mobile route of ball in the corresponding path of navigation, and the thickness that forms each periphery wall of path of navigation respectively is substantially equal to form the thickness of the periphery wall of central corridor.
In the present invention as claimed in claim 4, the outer surface that forms each periphery wall of path of navigation is arranged essentially parallel to the mobile route of the ball in the path of navigation.The thickness of this periphery wall is substantially equal to form the thickness of the periphery wall of central corridor.Therefore, the thickness of periphery wall is relatively more even basically on the whole length of ball-recirculation path.Therefore, the wall thickness of ball circulating member in its whole length basically relatively evenly.Therefore, the contraction change during the pouring operation in the casting material is difficult to enlarge, and so just can improve the accuracy at the inner ball-recirculation path that forms of ball circulating member.
At this, term " thickness is substantially equal to (perhaps even basically) " refers to the varied in thickness of periphery wall in ± 50%.That is, when the varied in thickness of periphery wall is in ± 50%, during the pouring operation on the whole length of casting product the contraction of casting material more stable, so this point is wished very much.And, when the varied in thickness of periphery wall is in ± 20%, during the pouring operation contraction of casting material more stable, so this point is more wished.
As the described ball circulating member of the present invention of the claim 5 that is subordinated to claim 4, it is characterized in that, when the internal diameter of ball-recirculation path is represented by Lw, and when the diameter of ball was represented by Dw, the ball-recirculation path formed in the mode that satisfies following formula (1) by the relation between Lw and the Dw:
Lw-Dw≤0.1Dw(1)
As claimed in claim 5ly the present invention is based on the present invention as claimed in claim 4, so the internal diameter of the ball-recirculation path scope that can be arranged to be scheduled to.That is, during formula (1) above the accuracy of control ball-recirculation path satisfies, the internal diameter of ball-recirculation path can keep below the admissible value of expectation.Therefore, can reduce ball interlaced arrangement and misgivings interfering with each other.Especially make when being made of resin when ball circulating member, be difficult to produce wearing and tearing in that the ball-recirculation path is inner.
According to the present invention as claimed in claim 6, a kind of ball circulating member that is used for ball screw is provided, this ball screw comprises thread spindle, described thread spindle has the ball rolling groove that forms in its external peripheral surface; Nut, described nut have the ball rolling groove that forms in its inner circumferential surface relative with the external peripheral surface of thread spindle; With a plurality of balls, described ball is arranged in the ball orbit path that forms between the ball rolling groove of nut and thread spindle; Ball circulating member comprises: the ball-recirculation path of Xing Chenging therein be used for mentioning ball from a side of ball orbit path, and the ball that will mention turns back in the opposite side of ball orbit path; The ball-recirculation path comprises central corridor, and a pair of path of navigation is sentenced continuous with it mode in the relative end of central corridor respectively and formed; Wherein, be used to prevent the prevent allotrylic cover part of foreign matter through each ball circulating member fixed hole intrusion, be formed on the outer surface of each periphery wall by a supporting part that prevents allotrylic cover part, thereby described fixed hole is formed at and is used to install ball circulating member in the nut, described periphery wall has formed path of navigation respectively, described supporting part is formed on the outer surface of periphery wall basically vertically, prevents allotrylic cover part thereby supporting.
In the present invention as claimed in claim 6, prevent that foreign matter from invading through (being used for fixing ball circulating member) ball circulating member fixed hole.In addition, the outer surface of each periphery wall of formation path of navigation is arranged essentially parallel to the mobile route of the ball in the path of navigation.In addition, the thickness that forms this periphery wall of path of navigation is substantially equal to form the thickness of the periphery wall of central corridor.Therefore, for example, when cardinal principle is even on the whole length of the thickness that makes periphery wall at the ball-recirculation path, just can make the wall thickness of ball circulating member relatively more even basically along whole length.Therefore, the contraction change during the pouring operation in the casting material is difficult to enlarge, and so just can improve the accuracy at the inner ball-recirculation path that forms of ball circulating member.
Ball screw of the present invention as claimed in claim 7 is included in the ball circulating member that each defined in the claim 4 to 6.
In the present invention as claimed in claim 7, provide and to have realized as the running of each described ball circulating member of claim 4 to 6 and the ball screw of advantage.
In the present invention, provide the ball screw of a kind of ball circulating member and this ball circulating member of use, wherein can improve accuracy at the inner ball-recirculation path that forms of ball circulating member.
Description of drawings
Fig. 1 is the explanatory diagram of side cap formula ball screw of the present invention.
Fig. 2 is the transverse sectional view of pith of the ball screw of Fig. 1.
Fig. 3 is the view according to the direction gained of the arrow E of Fig. 2, the nut when showing side cap and also not being fixed in the above.
Fig. 4 is the view according to the direction gained of the arrow E of Fig. 2, shows the nut that is fixed with behind the side cap of the present invention thereon.
Fig. 5 shows the explanatory diagram of side cap of the present invention.
Fig. 6 shows the explanatory diagram that side cap forms member.
Fig. 7 shows the explanatory zoomed-in view of the pith (being the F part among Fig. 6) of the cutting lines of side cap of the present invention.
Fig. 8 shows the explanatory sectional view that periphery wall is combined in the state of mentioning the close end office.
Fig. 9 shows the explanatory perspective view that periphery wall is combined in the state of mentioning the close end office.
Figure 10 is the view of side cap formula ball screw.
Figure 11 shows the explanatory perspective view of the side cap of example as a comparison.
Figure 12 shows the explanatory zoomed-in view according to the pith of the cutting lines of the mobile route setting at ball center.
Figure 13 shows the explanatory perspective view of side cap along the cutting lines separated situation consistent with ball center mobile route.
Figure 14 A and 14B show side cap of the present invention (the 3rd embodiment's) explanatory diagram, Figure 14 A show side cap outward appearance explanatory perspective view and the mobile route at the ball center in the side cap has been described, the side cap that Figure 14 B shows the side cap of having cut apart forms the explanatory perspective view of member.
Figure 15 A and 15B show side cap of the present invention (the 4th embodiment's) explanatory diagram, Figure 15 A is the explanatory perspective view of perspective that prevents allotrylic cover part, and Figure 15 B is the enlarged perspective that explanation prevents the pith (the supporting leg part among Figure 15 A) of allotrylic cover part.
Figure 16 A and 16B show the explanatory perspective view of the side cap of example as a comparison.
Embodiment
Now with reference to accompanying drawing the preferred embodiments of the present invention are described.Among each embodiment below, similarly partly will use identical reference character to represent respectively with the already mentioned ball screw in front.
(first embodiment)
At first, the first embodiment of the present invention will be described.
Fig. 1 is the explanatory diagram of side cap formula of the present invention (side cap-type) ball screw, Fig. 2 is the transverse sectional view of pith of the ball screw of Fig. 1, Fig. 3 and 4 is the views according to the direction gained of the arrow E of Fig. 2, Fig. 3 shows side cap does not also have nut fixed thereon, and Fig. 4 shows side cap of the present invention nut afterwards fixed thereon.
As illustrated in fig. 1 and 2, this ball screw 10 comprises thread spindle 12 and nut 14.
As shown in Figure 3, the side cap fixed surface 16 that defines by rectangle plane is formed at the external peripheral surface of nut 14.Pair of notches 20 is formed at side cap fixed surface 16.These otch 20 are communicated with the ball orbit path 8 that forms between ball rolling groove 11 and 13.
As shown in Figure 4, the side cap 17 (side cap) as ball circulating member is fixed on the side cap fixed surface 16.Side cap 17 has a pair of supporting leg part 19, and this can closely be assembled to respectively along the direction (see figure 1) perpendicular to thread spindle 12 in (forming in side cap fixed surface 16) otch 20 supporting leg part 19.As shown in Figure 4, the side cap shell 26 (this shell cover whole side cap 17) of whole side cap 17 by the cover shape is held and is close to side cap fixed surface 16, and is fixed on the nut 14 by set screw 18.
Ball is mentioned in each supporting leg part 19 that (scooping-up) (returning) path 21 is formed at side cap 17 (referring to Fig. 2).The bearing of trend that ball is mentioned (returning) path 21 tilts with respect to the external peripheral surface of supporting leg part 19.Ball is mentioned the direction inclination of (returning) path 21 along the ball-recirculation path.Each ball is mentioned (returning) path 21 and is communicated with ball supply passage 22, and this ball supply passage 22 and this are mentioned (returning) path 21 to ball and jointly formed ball-recirculation path 27.
That is, shown in Fig. 2 and 4, side cap 17 has by ball mentions the ball-recirculation path 27 (this path has overall structure on the whole length on the bearing of trend of ball-recirculation path 27) that (returning) path 21 and ball supply passage 22 form.In addition, although in fact supporting leg part 19 can fit into respectively in the otch 20 in the side cap fixed surface 16 at an easy rate, but the direction of advance that ball 15 is mentioned in (returning) path 21 at (being formed at supporting leg part 19 inside) each ball forms by such three dimensional constitution, and promptly ball can be tangent basically with thread spindle 12 and be raised on the consistent direction with the importing angle of each ball rolling groove 11 and 13 basically.Therefore, the formation of nut 14 is very simple, can improve the design freedom of ball-recirculation path 27 (being that ball is mentioned (returning) path 21 and ball supply passage 22) in addition.
The annular peripheral passage of ball 15 forms by ball-recirculation path 27 and ball orbit path 8.For example, the output shaft of motor (not shown) can be connected to an end of thread spindle 12 via connecting piece, and when thread spindle 12 rotations, nut 14 in axial direction moves by rolling ball 15.
Next, the segmenting structure of side cap 17 will be described in detail.Fig. 5 and Fig. 6 show the explanatory diagram of side cap of the present invention, and Fig. 5 is the perspective view of side cap, and Fig. 6 shows the side cap that has separated each other in the side cap and forms one of member.
As shown in Figure 6, side cap 17 has the ball-recirculation path 27 that portion within it forms (mentioning (returning) path 21 and ball supply passage 22 forms by ball), and comprises two side caps formation members 23 that separate each other in point-symmetric mode along the direction of advance of ball 15.Therefore, dividing surface 23d (also being used separately as the engaging surface that will link together) is formed at two side caps respectively and forms on the members 23, and promptly two side caps form member 23 along zone that cutting lines PL shown in Figure 6 separates each other.
Next, will describe cutting lines PL (perhaps dividing surface 23d) in more detail, two side caps form member 23 and are separated each other along this cutting lines.Fig. 7 shows near the explanatory zoomed-in view of the pith (that is, F among Fig. 6 part and) of side cap cutting lines, and this figure also illustrates the example of cutting apart of mentioning the close end office that ball of the present invention is mentioned part.Fig. 8 and 9 shows the explanatory diagram in the situation of mentioning the periphery wall combination with one another that near a pair of side cap proximal part forms member.
As mentioned above, side cap 17 is divided into two side caps along cutting lines PL and forms member 23, so this has dividing surface (engaging surface) 23d (referring to Fig. 6) respectively to side cap formation member 23 and 23.
As shown in Figure 7, side cap 17 has at each ball the ball that the terminal part office of mentioning (returning) path 21 forms and mentions part 24.Ball mention part 24 have ligule shape in case this part can insert in the ball rolling groove 11 of thread spindle 12, thereby from ball orbit path 8, successfully mention (in ball orbit path 8, rolling) ball 15, and its importing ball is mentioned in (returning) path 21.This ball is mentioned part 24 and is mentioned (returning) path 21 from ball and stretch out towards ball rolling groove 11.Therefore, slot-open-section 25 mentions that part 24 is interconnective mentions the formation of proximal part 24a places mentioning (returning) path 21 and ball with (forming) ball in supporting leg part 19, and slot-open-section 25 can adopt for example is the V-shaped groove of acute angle.
In side cap 17 of the present invention, cutting lines PL is formed at following position, and promptly this line is through this deepest part to the slot-open-section 25 of supporting leg part 19, as shown in Figure 7.Promptly, (side cap 17 is divided into two side caps forms members 23 and 23), cutting lines PL was formed at following position, promptly this line cuts the slot-open-section 25 of side cap 17 1 sides in advance at (V-shaped groove notch portion 25) summit place and cuts the slot-open-section 25 of opposite side, and forms the dividing surface 23d that two side caps form members 23 in this way.
Through near the cutting lines PL of slot-open-section 25 (forming) periphery wall extension part 23f place steadily extension continuously each mentions proximal part 24a, as shown in Figure 7 by curved portion with this curved portion continuous straight section.In other words, as shown in Figure 6, mention proximal part 24a near (promptly in the drawings show F part), as follows in this position of mentioning the cutting lines PL among the proximal part 24a, promptly ball circulating member form member 23 dividing surface 23d (mention part 24 away from ball and in the figure near an end place of supporting leg part 19) thus mentioning part 24 with respect to the mobile route deflection ball at ball center 15 forms periphery wall extension 23f.Therefore, the dividing surface 23d that mentions proximal part 24a place is formed by the spine of the slight bending of periphery wall extension part 23f, and therefore mentions concentrating of proximal part 24a upper stress and can more suitably reduce.In Fig. 7, reference character Z represents to mention the point of each ball 15.Side cap 17 on its whole length according to being divided into two parts as mentioned above, and except near the near-end of mentioning part 24a, cutting lines PL forms according to the mobile route at ball center, thereby makes two side caps form the circumference that member 23 centers on or be enclosed in equally ball basically.
Next, will first embodiment's the ball screw 10 and the running and the advantage of side cap 17 be described.
As mentioned above, in this ball screw 10, side cap 17 is fixed on the side cap fixed surface 16 of nut 14, and each ball 15 that rolls between ball rolling groove 11 and 13 is mentioned part 24 by the ball of side cap 17 and is mentioned along the direction at the importing angle of ball rolling groove 11 and 13, and is successfully imported in the ball supply passage 22.Therefore, in this ball screw 10, even the lead of ball rolling groove size with in the circulating ball screw of tubulose when identical, the also very difficult flip-flop of the direction of advance of ball 15 in the ball-recirculation part.Therefore, when mentioning ball 15, can suppress the damage of ball 15 and the generation of noise.In addition, the number in ball-recirculation loop is not limited to the screw thread number with respect to the leading screw groove of for example end cover type ball screw, so load capacity can increase and can not increase the number (number of circle) of ball.
In ball screw 10, side cap 17 comprises that a pair of ball circulating member that is separated from each other along the direction of advance of ball 15 forms member 23 and 23, therefore ball-recirculation path 27 (each ball 15 is mentioned by ball-recirculation path 27 along the direction consistent with the importing angle of ball rolling groove 11 and 13, turns back to initial position then) can be at an easy rate by resin cast etc. side cap 17 inner formation.
In addition, in ball screw 10, (having identical external shape) side cap is formed member 23 and 23 combine and form side cap 17 by being somebody's turn to do, adopt this structure can use the single mould side cap of casting to form member 23 and 23, therefore can produce side cap 17 at an easy rate.
In addition, the dividing surface 23d that each side cap forms member 23 and 23 is formed by cutting lines PL, and this cutting lines PL shifts to an earlier date cutting groove notch portion 25 (this part be formed at ball mentions part 24 mention proximal part 24a place) at the place, deepest part of slot-open-section 25.That is, in side cap 17, the cutting lines PL that two side caps formation members 23 and 23 are separated from each other is formed at following position, and promptly this line cuts in advance respectively and mentioning the slot-open-section 25 that proximal part 24a place forms.Therefore, in fact slot-open-section 25 is not formed at each and mentions proximal part 24a place, and the notch branch of mentioning proximal part that is formed at before this runs into the problem that stress is concentrated.Therefore, though when (circuit in side cap 17) ball 15 when side cap forms member 23 and applies impact force, also must worry hardly near mentioning proximal part 24a or its, to begin to take place fatigue failure.Therefore, can improve the high speed running performance and the endurance quality of ball screw 10.
As mentioned above, side cap is cut apart in the following way, and promptly cutting lines PL starts from the deepest part place of (and ending at) slot-open-section 25, and promptly its mode is that in fact slot-open-section 25 is not formed at each and mentions proximal part 24a place.As the negative effect of this structure, each ball circulating member forms the dividing surface (at an end place of mentioning part 24 away from ball) of member 23 and mentions part 24 with respect to the mobile route deflection ball at ball center 15.Therefore, the misgivings below existing promptly can become unstable by the ability of mentioning near the periphery wall constraint ball 15 the proximal part 24a.
(second embodiment)
Therefore, as the second embodiment of the present invention, will concentrate and can make at the ability stable structure of mentioning proximal part vicinity constraint ball and describe reducing the stress of mentioning on the proximal part.
Second embodiment's side cap 17 only is that with the difference of first embodiment's side cap 17 structure of periphery wall extension part 23f is different, and other structure is identical with aforesaid first embodiment's.Therefore, only describe the configuration of periphery wall extension part 23f, and omitted explanation other parts and member.
In second embodiment's side cap 17, the periphery wall extension part 23f (this part forms periphery wall) (here cutting lines PL is offset) that each side cap forms member 23 and 23 extends to the opposite side of mentioning proximal part 24a that covers the ball circulating member formation member 23 that matches, as Fig. 8 and shown in Figure 9.
Use this structure, though determined split position makes two ball circulating members formation members 23 mention proximal part 24a with 23 periphery wall at each and sentences different ratios around ball, but periphery wall is combined by this mode that one of periphery wall covers another periphery wall, as shown in Figure 8.Therefore, can make by the ability of mentioning near the periphery wall constraint ball 15 the proximal part 24a and become stable.In Fig. 8, reference character O represents the center of ball 15.
Therefore, in second embodiment's side cap 17, two side caps form member 23 and 23 and can combine in the following manner, and promptly the periphery wall extension part 23f of each side cap formation member 23 covers the opposite side of mentioning proximal part 24a that the side cap that is complementary forms member 23.Therefore, can make by the ability of mentioning near the periphery wall constraint ball the proximal part 24a and become stable.
As mentioned above, in ball screw 10 of the present invention, improve the ball of (as ball circulating member) side cap 17 and mentioned the intensity of mentioning proximal part 24a of part 24 (this part has less intensity), and, just can provide side cap 17 that can strengthen working at high speed performance and endurance quality and ball screw 10 with this side cap 17 by doing like this.
Ball screw of the present invention is not limited to top embodiment, can carry out various improvement under the prerequisite that does not break away from subject matter of an invention.
For example, in each the foregoing description, projection and hole as positioning device can be set at dividing surface (engaging surface) 23d place, thereby two dividing surfaces are relative to each other located.The side cap fixed hole that is used for set screw 18 is directly passed can be formed at side cap 17.
In the above-described embodiments, near each mentions proximal part 24a, equally side cap is cut apart according to the mobile route at ball center in other place, cutting lines PL (side cap 17 is cut apart on its whole length along this cutting lines) is set in this way.Yet the present invention is not limited to this structure, and it is not so equally cutting apart that cutting lines also can be arranged to make side cap.Yet, thereby for make two ball circulating members form members can be basically equally round the ability of ball scleronomic constraint ball, preferably adopt mobile route, cutting lines PL is set by near equally cut apart side cap mentioning proximal part except each in other place mode according to the ball center.
In the above-described embodiments, though have the V-shaped groove that is acute angle at the slot-open-section 25 of mentioning the formation of proximal part 24a place, slot-open-section 25 is not limited to this V-shaped groove.That is, slot-open-section only needs to comprise recess, and for example depression and groove also can be U-shaped or semicircle such as slot-open-section.
In the ball screw 10 of the foregoing description, though side cap 17 (side cap forms member 23 and 23) is formed by resin, side cap 17 also can for example be formed by metal, for example uses agglomerated material, for example sintered steel, perhaps metal jet molding (MIM).Use this part structure, ball screw even can be used under the situation of high temperature is inappropriate and use resin cast type side cap under the situation of this high temperature.
In addition, be used for mentioning ball or the path of navigation 21p that ball turns back to ball orbit path 8p being formed in (see figure 2) in each supporting leg part 19p of side cap 17p from ball orbit path 8p.The bearing of trend of path of navigation 21p tilts with respect to the external peripheral surface of supporting leg part 19p.That is, path of navigation 21p tilts along the direction of ball-recirculation path.Each path of navigation 21p is communicated with central corridor 22p, and this central corridor 22p jointly forms ball-recirculation path 27p with this to path of navigation 21p.The annular peripheral passage that is used for ball 15p forms by ball-recirculation path 27p and ball orbit path 8p.For example, the output shaft of motor (not shown) can be connected to the end of thread spindle 12p via connecting piece, and when thread spindle 12p rotated, nut 14p in axial direction moved by rolling ball 15p.
More particularly, shown in Fig. 2 and 4, side cap 17p has the ball-recirculation path 27p (this path has overall structure on the whole length on the bearing of trend of ball-recirculation path 27p) that is formed by path of navigation 21p and central corridor 22p.In addition, although in fact supporting leg part 19p can easily be fitted into respectively in the ball circulating member fixed hole 20p among the side cap fixed surface 16p, but the direction of advance that ball 15p mentions among (returning) path 21p at (supporting leg part 19p inner form) each ball forms by such three dimensional constitution, and promptly ball can be tangent basically with thread spindle 12p and be raised on the consistent direction with the importing angle of each ball rolling groove 11p and 13p basically.Therefore, the formation of nut 14p is very simple, has improved the design freedom of ball-recirculation path 27p (being path of navigation 21p and central corridor 22p) in addition.Side cap 17p has the ball that forms in the terminal part office of each path of navigation 21p and mention part (being represented by reference character PU) in Figure 15.Ball is mentioned part and is had the shape of similar ligule, so that this part can be inserted among the ball rolling groove 11p of thread spindle 12p, thereby from ball orbit path 8p, successfully mention (perhaps scooping up) (in ball orbit path 8p, rolling) ball 15p, and it is imported among the path of navigation 21p.This ball is mentioned part and is stretched to ball rolling groove 11p from path of navigation 21p.
Next, will periphery wall that form side cap 17p and the ball-recirculation path that wherein forms be described in more detail.Figure 14 and 15 shows the explanatory diagram of side cap 17p, and Figure 14 is the perspective view of side cap, and Figure 14 A shows side cap and forms component composition situation together, and Figure 14 B shows one of them side cap and forms member.
The ball-recirculation path 27p that is formed by path of navigation 21p and central corridor 22p forms in the side cap 17p of having cut apart inside as shown in Figure 14B.
That is, the ball-recirculation path 27p that is formed on side cap 17p inside comprises and sentences a pair of path of navigation 21p that continuous with it mode forms respectively at the relative two ends of central corridor 22p.Path of navigation 21p is formed or is defined by the periphery wall around these path of navigation 21p respectively, and these periphery walls form a pair of supporting leg part 19p (referring to Figure 14 A) respectively.This is thereby that the importing angle with thread spindle 12p that tilts is corresponding to supporting leg part 19p, promptly tilt in opposite direction with predetermined angle with respect to central corridor 21p, shown in Figure 14 A and 14B, and these supporting leg parts 19p forms in the mode of three-dimensional with the path of navigation 22p that wherein forms.In Figure 14 A, the direction that ball 15p advances with three dimensional constitution is represented to C by arrow A.
As shown in Figure 14B, the periphery wall that forms path of navigation 21p is formed by the periphery wall surface 23ap that is arranged to be parallel to path of navigation 21p basically.The thickness T A that forms the periphery wall of path of navigation 21p is substantially equal to form the thickness T C of the periphery wall of central corridor 22p, also equals the thickness T B of curved portion.Here, term " thickness is substantially equal to (perhaps even basically) " refers to the varied in thickness of periphery wall in ± 50%.That is, more stable on the whole length that is contracted in the die casting product of casting material during the pouring operation when the varied in thickness of periphery wall is in ± 50%, so this point is desirable.And, when the varied in thickness of periphery wall is in ± 20%, during the pouring operation contraction of casting material more stable, so this point is more wished.Preferably except the thickness of prescribed product on the whole length, this product (ball circulating member) is cast by following mode, promptly on its whole length, compare evenly (promptly basically at shape of cross section perpendicular to the periphery wall in the plane of ball direction of advance, external peripheral surface is arranged essentially parallel to inner circumferential surface, no matter and the shape of external peripheral surface how).When the thickness on the whole length reduces when causing thickness to equate (even basically) basically on whole length, fears are entertained that, and product is frangible.In this case, have less than the flexural modulus of 40kg/cm2 and when being not less than the casting material of 5 cantilever impact value, this material is just very suitable, the impact value of ball because it can dissipate when choosing.
The periphery wall of side cap 17p has (uniform basically) thickness that equates basically on whole length, and the internal diameter of therefore working as ball-recirculation path 27p is represented (referring to Figure 14 B) by Lw, and the diameter of ball 15p is when being represented by Dw, and ball-recirculation path 27p forms according to the mode that the relation between Lw and the Dw satisfies following formula (1).In other words, side cap 17p (a pair of ball circulating member forms member 23p and 23p) forms by this way, and promptly the thickness of periphery wall changes in the scope that satisfies following formula (1).
Lw-Dw≤0.1Dw(1)
(the 3rd embodiment)
Next, will the 3rd embodiment's ball screw 10p and operation and the advantage of side cap 17p be described.
As mentioned above, in this ball screw 10p, side cap 17p is fixed on the side cap fixed surface 16p of nut 14p, and each the ball 15p that rolls between ball rolling groove 11p and 13p mentions part 24p by the ball of side cap 17p and mentions along the direction at the importing angle of ball rolling groove 11p and 13p, and is successfully imported among the central corridor 22p.Therefore, in this ball screw 10p, even the helical pitch size of ball rolling groove as in the circulating ball screw of tubulose the time, the direction of advance of ball 15p also is difficult to flip-flop in the ball-recirculation part.Therefore, when mentioning ball 15p, can suppress the damage of ball 15p and the generation of noise.In addition, the number in ball-recirculation loop for example is not limited to the screw thread number with respect to the leading screw groove of end cover type ball screw, so load capacity can increase and can not increase the number (number of circle) of ball.
In ball screw 10p, side cap 17p comprises that a pair of ball circulating member that is separated from each other along the direction of advance of ball 15p forms member 23p and 23p, therefore ball-recirculation path 27p (each ball 15p is mentioned by ball-recirculation path 27p along the direction consistent with the importing angle of ball rolling groove 11p and 13p, turns back to initial position then) can be at an easy rate forms in that side cap 17p is inner by resin cast etc.
In addition, in ball screw 10p, (having identical external shape) side cap is formed member 23p and 23p combine and form side cap 17p by being somebody's turn to do, and can use the single mold side cap of casting to form member 23p and 23p by this structure, therefore can produce side cap 17p at an easy rate.
Especially in this ball screw 10p, the outer surface that forms each periphery wall 23ap of path of navigation 21p is arranged essentially parallel to the mobile route of (being represented by the arrow A) ball among the path of navigation 21p.The thickness T A of this periphery wall 23ap is substantially equal to form the thickness T C of the periphery wall of central corridor 22p.That is the thickness of periphery wall evenly (TA=TC) basically on the whole length of ball-recirculation path 27p.Therefore, the wall thickness of side cap 17p along its whole length basically relatively evenly.Therefore, the contraction change in the casting material is difficult to enlarge, and so just can improve the accuracy at the inner ball-recirculation path 27p that forms of side cap 17p.
In addition, the accuracy that needs control ball-recirculation path 27p is satisfying above-mentioned formula (1), so the internal diameter of ball-recirculation path 27p can be held the admissible value that is lower than expectation.Therefore, just can reduce ball 15p is arranged and worry interfering with each other with interlace mode, especially when side cap is formed from a resin, can suitably suppress the wearing and tearing of ball-recirculation path inside.
This of side cap 17p can closely be assembled to (see figure 1) among the ball circulating member fixed hole 20p of a pair of similar otch along the direction perpendicular to thread spindle 12p respectively to supporting leg part 19p.As mentioned above, the outer surface of the periphery wall 23ap of the path of navigation 21p that forms in each supporting leg part 19p is arranged to be arranged essentially parallel to the mobile route of ball, so outer wall surface 23ap forms in the mode that tilts.Therefore, after side cap 17p was fixed on the nut 14p, depression can be formed at the supporting leg part 19p inserting side of each ball circulating member fixed hole 20p.That is, when depression was formed at the place, supporting leg part 19p inserting side of each hole 20p, supporting leg part 19p just can not fully seal this hole 20p, will worry that therefore foreign matter is through this depression intrusion.Therefore, wish that depression passes through for example member sealing of similar cover.
(the 4th embodiment)
Therefore, the fourth embodiment of the present invention will be described, wherein form and prevent allotrylic cover part, be used for suitably preventing that foreign matter from invading through (being used for fixing side cap 17p's) ball circulating member fixed hole 20p at each supporting leg place of a pair of supporting leg part 19p of side cap 17p.
That is, in the fourth embodiment of the present invention, be provided with its periphery wall uniform basically side cap on the whole length of ball-recirculation path, and formed the cover part that prevents that foreign matter from invading through the ball circulating member fixed hole in the leg section office.The difference of the 4th embodiment's side cap 17p and the 3rd embodiment's side cap 17p only is to be provided with and prevents allotrylic cover part and support the supporting part that prevents allotrylic cover part respectively, and other structure is identical with aforesaid the 3rd embodiment.Therefore, only describe the supporting part that prevents allotrylic cover part and support it, and omitted explanation other parts and member.
In the 4th embodiment's side cap 17p, prevent allotrylic cover part 24p and prevent that the supporting part 25p (this part is supporting and preventing allotrylic cover part 24p) of allotrylic cover from forming on the outer surface 23ap of each periphery wall that is formed with path of navigation 21p.
Prevent that for making allotrylic cover part 24p from can prevent suitably that foreign matter is through ball circulating member fixed hole 20p intrusion, this prevents that allotrylic cover part 24p has the excircle part 24ap consistent with the interior shape of ball circulating member fixed hole 20p, and when side cap is fixed on the nut, prevent the depression of place, the supporting leg part 19p inserting side formation that allotrylic cover part 24p has sealed at ball circulating member fixed hole 20p.The supporting part 25p that prevents allotrylic cover part forms to support the mode that prevents allotrylic cover part 24p on the outer surface 23ap of periphery wall vertically.That is, prevent that allotrylic cover part 24p is arranged on the outer surface 23ap of periphery wall by a supporting part 25p who prevents allotrylic cover part.
Therefore, in the 4th embodiment's side cap 17p, can prevent foreign matter through the ball circulating member fixed hole 20p that wherein is fixed with side cap 17p and invade, and can realize operation similar and advantage to the 3rd embodiment's side cap.
As mentioned above, in the present invention, provide to have the side cap 17p that accuracy is improved, and the ball screw that is provided with this side cap 10p also is provided with ball-recirculation path 27p.
Ball screw of the present invention is not limited to the foregoing description, can carry out various improvement under the prerequisite that does not break away from subject matter of an invention.
In each above-mentioned passing through a pair of side cap formation member 23p and 23p are combined among the embodiment who forms side cap 17p, can locate to be provided with projection and hole at dividing surface (engaging surface), so that two dividing surfaces are relative to each other located as positioning device.The side cap fixed hole that is used for set screw 18p is directly passed can form at side cap 17p.Though side cap 17p combines and forms by this is formed member 23p and 23p to side cap, side cap needn't always be divided into two parts.For example, side cap can be divided into four parts, and therefore can form by four side caps formation members, and wherein above-mentioned side cap 17p is also separated at the central part place of central corridor.A pair of path of navigation forms by continuous mode at the relative place, end of central corridor respectively, term " continuously " is not limited to show that forming member directly is integrally formed with one another, but also comprises a plurality of members of separating mutually " on the function continuously " meaning of combining each other.
In the above-described embodiments, cutting lines PL (side cap 17p is cut apart on its whole length along this cutting lines) is provided with according to the mobile route at ball center and in the mode of equally cutting apart side cap.Yet the present invention is not limited to this structure, and cutting lines also can be arranged to make the side cap structure so equally to be cut apart.
Claims (8)
1. ball circulating member that is used for ball screw, this ball screw comprises thread spindle, described thread spindle has the ball rolling groove that forms on its external peripheral surface; Nut, described nut have the ball rolling groove that forms on its inner circumferential surface relative with the external peripheral surface of described thread spindle; With a plurality of balls, described ball is arranged in the ball orbit path that forms between the ball rolling groove of described nut and described thread spindle;
Described ball circulating member comprises:
Ball is mentioned part, and each ball is mentioned part and all is used for mentioning ball from a side of described ball orbit path;
The ball-recirculation path is used for and will mentions the opposite side that the ball of mentioning at the part place turns back to the ball orbit path at described ball;
Described ball is mentioned part and described ball-recirculation path forms an integral body each other;
Slot-open-section forms mentioning the close end office respectively, and integrally described ball is mentioned part respectively and be connected to described ball-recirculation path; And
Two ball circulating members form members, and the cutting lines that this member extends on the direction of advance through the ball of described ball circulating member inside is separated each other, wherein,
Described cutting lines is through the deepest part of the described slot-open-section of a side, and the deepest part of the described slot-open-section of process opposite side.
2. ball circulating member as claimed in claim 1, wherein,
Each of two described ball circulating member formation members all has the periphery wall extension of extending from its periphery wall, and
The periphery wall extension part of each of two described ball circulating member formation members all covers the opposite side of mentioning proximal part that the ball circulating member that is complementary forms member.
3. ball screw comprises:
Ball circulating member as claimed in claim 1.
4. ball circulating member that is used for ball screw, this ball screw comprises thread spindle, described thread spindle has the ball rolling groove that forms in its external peripheral surface; Nut, described nut have the ball rolling groove that forms in its inner circumferential surface relative with the external peripheral surface of thread spindle; With a plurality of balls, described ball is arranged in the ball orbit path that forms between the ball rolling groove of described nut and described thread spindle;
Described ball circulating member comprises:
The ball-recirculation path of Xing Chenging is used for mentioning ball from a side of ball orbit path, and the ball of being mentioned is turned back in the opposite side of ball orbit path therein;
Described ball-recirculation path comprises central corridor, and a pair of path of navigation is sentenced continuous with it mode in the opposite end of described central corridor respectively and formed; Wherein,
The outer surface that forms each periphery wall of described path of navigation respectively is arranged to basically to parallel with the mobile route of ball in the described respective guide path, and
The thickness that forms each periphery wall of described path of navigation respectively is substantially equal to be formed at the thickness of the periphery wall of described central corridor.
5. ball circulating member as claimed in claim 4, wherein,
When the internal diameter of described ball-recirculation path is represented by Lw, and the diameter of described ball is when being represented by Dw,
Described ball-recirculation path forms according to the mode that the relation between Lw and the Dw satisfies following formula (1):
Lw-Dw≤0.1Dw(1)
6. ball circulating member that is used for ball screw, this ball screw comprises thread spindle, described thread spindle has the ball rolling groove that forms in its external peripheral surface; Nut, described nut have the ball rolling groove that forms in its inner circumferential surface relative with the external peripheral surface of thread spindle; With a plurality of balls, described ball is arranged in the ball orbit path that forms between the ball rolling groove of described nut and described thread spindle;
Described ball circulating member comprises:
The ball-recirculation path of Xing Chenging is used for mentioning ball from a side of described ball orbit path, and the ball of being mentioned is turned back in the opposite side of described ball orbit path therein;
Described ball-recirculation path comprises central corridor, and a pair of path of navigation sentences continuous with it mode in the opposite end of described central corridor respectively and form, wherein,
Be used to prevent the prevent allotrylic cover part of foreign matter through each ball circulating member fixed hole intrusion, this part is formed on the outer surface of described each periphery wall by the described supporting part of allotrylic cover part that prevents, thereby described fixed hole is formed at and is used in the described nut described ball circulating member is installed on wherein, described periphery wall is formed with described path of navigation respectively, thereby described supporting part is formed on vertically basically on the outer surface of described periphery wall and supports the described allotrylic cover part that prevents.
7. ball screw comprises:
Ball circulating member as claimed in claim 4.
8. ball screw comprises:
Ball circulating member as claimed in claim 6.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP230730/04 | 2004-08-06 | ||
| JP2004230730A JP4525233B2 (en) | 2004-08-06 | 2004-08-06 | Ball circulation member and ball screw |
| JP234303/04 | 2004-08-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1740590A true CN1740590A (en) | 2006-03-01 |
| CN100441916C CN100441916C (en) | 2008-12-10 |
Family
ID=36025361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101098506A Active CN100441916C (en) | 2004-08-06 | 2005-08-08 | Ball circulating member and ball screw |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4525233B2 (en) |
| CN (1) | CN100441916C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107076285A (en) * | 2014-10-17 | 2017-08-18 | 舍弗勒技术股份两合公司 | Ball screw nut |
| CN110375045A (en) * | 2018-04-13 | 2019-10-25 | 银鼎精密元件（上海）有限公司 | Two-piece return pipe and ball screw structure |
| CN110375046A (en) * | 2018-04-13 | 2019-10-25 | 银鼎精密元件（上海）有限公司 | Ball screw structure |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2650563B1 (en) * | 2010-12-08 | 2020-03-25 | NSK Ltd. | Ball screw device |
| CN206054653U (en) * | 2014-01-06 | 2017-03-29 | 日本精工株式会社 | Ball-screw |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2325859A1 (en) * | 1975-03-12 | 1977-04-22 | Legueu Pierre | Ball screw for machine tool use - has transfer passage with lip to pick up balls and bent through right angle |
| JP2591913Y2 (en) * | 1991-12-13 | 1999-03-10 | 日本精工株式会社 | Ball screw device |
| JP2002310254A (en) * | 2001-04-13 | 2002-10-23 | Koyo Seiko Co Ltd | Ball screw device and electric power steering device using the same |
| JP3993504B2 (en) * | 2001-12-05 | 2007-10-17 | Ｔｈｋ株式会社 | Ball screw circulation parts and ball screw |
| JP2003294105A (en) * | 2002-03-29 | 2003-10-15 | Nsk Ltd | Screw feed device |
| JP2003343683A (en) * | 2002-05-30 | 2003-12-03 | Nsk Ltd | Linear motion device |
| JP2004108455A (en) * | 2002-09-17 | 2004-04-08 | Nsk Ltd | Ball screw device |
| CN2597759Y (en) * | 2002-12-27 | 2004-01-07 | 银泰科技股份有限公司 | Circulation flow guiding pipe of nut seat of ball guide screw |
-
2004
- 2004-08-06 JP JP2004230730A patent/JP4525233B2/en active Active
-
2005
- 2005-08-08 CN CNB2005101098506A patent/CN100441916C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107076285A (en) * | 2014-10-17 | 2017-08-18 | 舍弗勒技术股份两合公司 | Ball screw nut |
| US10591033B2 (en) | 2014-10-17 | 2020-03-17 | Schaeffler Technologies AG & Co. KG | Ball screw nut |
| CN110375045A (en) * | 2018-04-13 | 2019-10-25 | 银鼎精密元件（上海）有限公司 | Two-piece return pipe and ball screw structure |
| CN110375046A (en) * | 2018-04-13 | 2019-10-25 | 银鼎精密元件（上海）有限公司 | Ball screw structure |
| CN110375046B (en) * | 2018-04-13 | 2022-07-19 | 银鼎精密元件（上海）有限公司 | Ball screw structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4525233B2 (en) | 2010-08-18 |
| JP2006046570A (en) | 2006-02-16 |
| CN100441916C (en) | 2008-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1740590A (en) | Ball circulating member and ball screw | |
| CN1190603C (en) | Device for assembling two panels or the like and formed by two co-operating parts | |
| CN1361937A (en) | Motor and production method of motor | |
| CN1190174C (en) | Interdental brush and production method therefor | |
| CN1250900C (en) | Reflector-movable head-light for automobile | |
| CN101039820A (en) | Mirror angle adjuster | |
| CN1693723A (en) | A joining assembly including a plastic support member and a plastic threaded element | |
| CN1116358A (en) | Tarnsformer and coil bobbin therefor | |
| CN1066621C (en) | A cosmetic container | |
| CN101068497A (en) | Endoscope insertion part | |
| CN1671312A (en) | Button | |
| CN1597246A (en) | Ball screw apparatus | |
| CN1692232A (en) | Multi-pitch screw, multi-pitch nut, feed screw device using the screw and nut, and method of producing the nut | |
| CN101045480A (en) | Bicycle pedal crank assembly and related elements | |
| CN1133887C (en) | Centralized coating mould device for producing separable optical fiber belt and its producing method | |
| CN1320243C (en) | Key cylinder and method for assembling a key cylinder | |
| KR101330467B1 (en) | Form rolling die | |
| CN1897407A (en) | Small DC motor | |
| CN1294561A (en) | Synthetic resin container bearing lable | |
| US9841096B2 (en) | Belt pulley and method for producing it | |
| JP2011117472A (en) | Prepared hole for fastening screw | |
| CN1258069C (en) | Inside micrometer | |
| CN1407251A (en) | Torsional limitator and rotary component with it | |
| CN1455718A (en) | Lapping tool | |
| CN1429168A (en) | Synthetic resin cap, manufacturing method and device thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |