CN209444767U - Planetary-screw and toolroom machine with the planetary-screw - Google Patents

Abstract

A kind of planetary-screw and the toolroom machine with the planetary-screw, to solve the problems, such as the construction complexity and Rotation Noise of existing planetary-screw.The planetary-screw includes: a driving screw, has an external screw thread and an interconnecting piece；One nut runs through the hole of the nut both ends of the surface with one, and the inner wall for forming the hole has an internal screw thread；And a planetary set, there is a support construction, for supporting multiple rollers in the support construction position rotating, multiple roller is mutually the same and has external screw thread, and the external screw thread of multiple rollers is meshed with the internal screw thread of the external screw thread of the driving screw and the nut.The planetary-screw can be used in a toolroom machine.

Description

Planetary-screw and toolroom machine with the planetary-screw

Technical field

The utility model relates to a kind of linear translation mechanism and the toolroom machines with the linear translation mechanism more particularly to one Kind for converting rotational motion into linear translatory motion, or by linear translatory motion be converted to rotary motion planetary-screw and Toolroom machine with the planetary-screw.

Background technique

Fig. 1 is please referred to, is a kind of existing planetary-screw 9, the planetary-screw 9 is by a driving screw 91 and a nut Between 92 be equipped with multiple rollers 93, the driving screw 91 have an external screw thread 911, the nut 92 have an internal screw thread 921 and Non-threaded 922 part of 921 sections of two sides of internal screw thread, non-threaded 922 part accommodate a collar 94, have in the collar 94 interior Ring tooth 941 and a fixed plate 95, multiple roller 93 is mutually the same and has external screw thread 931 and outer toothed portion 932, and multiple The both ends of roller 93 cover respectively is through at two fixed plates 95, and multiple roller 93 is distributed in the driving screw 91 weeks with equi-angularly space It encloses, and coaxial with the driving screw 91, the external screw thread 931 of multiple roller 93 and the internal screw thread 921 of nut 92 and the driving screw 91 External screw thread 911 be meshed, the outer toothed portion 932 of multiple roller 93 is meshed with the inner circular tooth 941 of the collar 94, makes the nut 92 can move axially relative to the driving screw 91, or move axially the driving screw 91 can relative to the nut 92.

In addition, being additionally provided with oil between two fixed plates 95 and the collar 94 to keep the smooth of the planet stud 9 rotation Envelope 951 in filling lubricating oil in the nut 92 and between two fixed plates 95, and also screws togather that there are two ends on the driving screw 91 Lid 96, two end caps 96 close two end edges of the nut 92, to prevent the lubricating oil to be lost.

Above-mentioned existing planet stud 9, in order to ensure multiple roller 93 can be with jointly stabilizing around the driving screw 91 Around and the nut 92 in rotation, in multiple 93 additional processing of roller outer toothed portion 932, and in processed in the nut 92 this two A non-threaded 922 part simultaneously accommodates processing inner circular tooth 941 in the collar 94 and the collar 94, in this way, the existing planet spiral shell The construction of bar is complicated, and the problem of cause processing cost to increase.

In addition, the lubricating oil can still follow external screw thread 911,931 that the driving screw 91 and multiple roller 93 are screwed Position is gradually lost, and causes the planetary-screw that can generate noise when rotating, so need to frequently disassemble two end caps 96, this two it is solid After fixed board 95, the collar 94 and multiple roller 93, then the lubricating oil is filled in the nut 92 and two fixed plates 95 Between, so that the filling of the lubricating oil is become trouble and difficulty.

In view of this, existing planetary-screw still has improvedd necessity really.

Utility model content

Toolroom machine described in the utility model can be used to convert rotational motion into linear translatory motion, or will linearly put down The transmitting of various power, the output that shifting movement is converted to rotary motion are mechanical.It such as but can be without limitation plastic forming, punching Press, linear actuators, 3D printing machine etc..

To solve the above problems, can simplify its construction the purpose of this utility model is to provide a kind of planetary-screw, into And processing cost can be reduced.

The purpose of this utility model is to provide a kind of planetary-screw, there is simple structure, and profit can be easy to carry out The filling of lubricating oil, and then noise when planetary-screw rotation can be reduced.

The purpose of this utility model is to provide a kind of toolroom machine with the planetary-screw, can be easy to carry out maintenance and Lubricating oil is filled, and then the noise when toolroom machine failure rate and its planetary-screw rotation can be reduced.

The planetary-screw of the utility model a, comprising: driving screw has an external screw thread and an interconnecting piece；One Nut runs through the hole of the nut both ends of the surface with one, and the inner wall for forming the hole has an internal screw thread；An and planet Group has a support construction, and for supporting multiple rollers in the support construction position rotating, the multi-roller is mutually the same and has There is external screw thread, the external screw thread of multiple rollers is meshed with the internal screw thread of the external screw thread of the driving screw and the nut.

Accordingly, the planetary-screw of the utility model is mainly connect by the support construction and the driving screw and nut Cheng Wei Touching, and only engaged by the external screw thread of multiple roller with the internal screw thread of the external screw thread of the driving screw and the nut, make multiple At can be relative to the driving screw and nut at rotation and revolution, have relatively simple construction and can be reduced on the whole roller Friction, in this way, the processing cost of the planetary-screw can be greatly reduced, and can promote production and packaging efficiency.And due to the branch Support structure does not contact directly with the driving screw and nut, and then can reduce formed noise and other effects when planetary-screw rotation.

Wherein, which is ladder type hole, has first internal diameter in the inner wall of interlude, at the nut both ends The inner wall on side has the second internal diameter, which is closely sealed portion, and the internal diameter in the closely sealed portion is greater than this in first The internal diameter of diameter, the internal screw thread are located at the first internal diameter position.So, it can be ensured that the external screw thread of multiple roller only can be with this The internal screw thread of nut is meshed, to avoid multiple roller external screw thread collide the nut other inner walls effect.

Wherein, which has at least one through-hole for penetrating through the inner wall, outside wall surface, which respectively can be with It is in openable closing by a plug member.In this way, lubricating oil to be fills up to the effect in the nut in which can be convenient.

Wherein, which is two, and two through-holes respectively can connect an oil guide pipe.In this way, the lubricating oil can be made At the effect being cyclically fills up in the nut.

Wherein, which is made of two fixed plates and multiple fixed columns, the centre of two fixed plates Respectively with a perforation and the multiple assembly holes being surrounded on around the perforation, it is circle that multiple assembly hole, which is located at the perforated base, On the circumference of the same Radius of the heart, the both ends of multiple fixed column are respectively in connection in the assembly hole.In this way, the support construction can be with Firmly support multiple roller at the effect of position rotating.

Wherein, the both ends of multiple fixed column respectively have an engaging portion for protruding from two fixed plates, the knot Conjunction portion has external screw thread, and each engaging portion is fixed for an engaging member with threads.In this way, multiple fixed column, which has, to be facilitated Ground dismantling and combination, the effect for making the support construction and multiple rollers repair and replace with can be convenient.

Wherein, multiple fixed column respectively has external screw thread and mutually the same, and each external screw thread respectively can be with the driving screw The internal screw thread of external screw thread and the nut is meshed, and respectively has a gap, each gap between each engaging member and two fixed plates Slightly larger than the back lash of the external screw thread of each fixed column and the internal screw thread of the external screw thread of the driving screw and the nut.In this way, should Multiple fixed columns equally can be relative to the driving screw and nut at the effect of rotation and revolution.

Wherein, the engaging member is heavy is set to the assembly hole.In this way, the engaging member has the effect of that the fixation plate surface will not be protruded from.

Wherein, which protrudes from the outer surface of two fixed plates and does not contact with the nut.In this way, can prevent The engaging member, which collides the nut and the fixed column, can be facilitated the effect of removal.

Wherein, the both ends of multiple roller respectively have an assembled portion, and each assembled portion is each can be arranged in two fixed plates Assembly hole at moving rotary.So, it can be ensured that multiple roller is located at the effect between two fixed plates at smooth rotation.

Wherein, the planetary roller quantity between the adjacent fixed column of any two is identical.In this way, multiple fixed column can be equal The frictional force that the even multiple roller of receiving and driving screw and nut revolve, has the effect of can achieve good force balance.

Wherein, the closely sealed portion at the both ends of the nut respectively has a closure member, and the closure member is at being releasably incorporated into this Nut.In this way, lubricating oil can be closed in the hole of the nut by the closure member, to avoid lubricating oil leakage, to promote work Make the tidiness of environment, and prevent extraneous dust or foreign matter from falling into the spiral shell and turning space, avoids influencing the nut and the main spiral shell The effect of the smooth rotation degree of bar.

Wherein, which is made of elastic material.It, can be to avoid in this way, the closure member has preferably sealing effect The effect that lubricating oil leaks out.

Wherein, which is screwed with the driving screw with screw thread, the screw pitch of the screw thread of the closure member and the driving screw or Spiral shell shape is different.So, it can be ensured that lubricating oil can be closed in the hole of the nut by the closure member, can to avoid lubricating oil by The effect for screwing togather position leakage of the closure member and the driving screw.

In addition, the planetary-screw of the utility model can be used in a toolroom machine, can be used for converting rotational motion into Linear translatory motion, or linear translatory motion is converted into rotary motion, and have and carry out to the planetary-screw with can be convenient Maintenance and filling lubricating oil and other effects.

Detailed description of the invention

Fig. 1 is a kind of existing planetary-screw structural map.

Fig. 2 is the stereogram exploded view of the first preferred embodiment of the utility model.

Fig. 3 is the stereogram exploded view of the planetary set of the first preferred embodiment of the utility model.

Fig. 4 is the combination section of the first preferred embodiment of the utility model.

Fig. 5 is the local structure enlarged drawing of A as shown in Figure 4.

Fig. 6 is the driving screw and nut structural map of the part B as shown in Figure 4.

Fig. 7 is the combination section of the second preferred embodiment of the utility model.

Description of symbols

(the utility model)

1 driving screw

11 external screw thread, 12 interconnecting piece

2 nuts

2a the first internal diameter the second internal diameter of 2b

2c third internal diameter

The closely sealed portion of 21 internal screw thread 22

23 hollow part, 24 through-hole

25 plug member, 26 setting element

3 planetary sets

The perforation of 31 fixed plates 311

312 assembly holes 32,32 ' fixed columns

321,321 engaging portions ' 322,322 ' engaging members

323 ' external screw threads

33 roller, 331 assembled portion

34 leak-stopping parts

4 closure members

41 stretch through 42 internal screw thread of hole

The gap G

(prior art)

9 planetary-screw, 91 driving screw

911 external screw thread, 92 nut

921 internal screw threads 922 are non-threaded

921 internal screw threads 922 are non-threaded

93 roller, 931 external screw thread

932 outer toothed portion, 94 collar

95 fixed plate, 951 oil sealing

96 end caps.

Specific embodiment

To enable the above-mentioned and other purposes, feature and advantage of the utility model to be clearer and more comprehensible, hereafter spy enumerates this reality With novel preferred embodiment, and cooperate attached drawing, be described in detail below:

The utility model full text directionality or its approximate term, for example, "front", "rear", "left", "right", " on (top) ", " under (bottom) ", "inner", "outside", " side " etc., mostly in reference to the direction of attached drawing, each side's tropism or its approximate term are only To aid in illustrating and understand each embodiment of the utility model, not to limit the utility model.

The approximation term such as " in conjunction with ", " combination " described in the utility model full text or " assembling ", it is main comprising still may be used after connection It separates with not destroying component, or the kenels that keep component inseparable etc. after connection；Such as with have threaded component be screwed or The connection types such as solder bond, can be according to being intended to connected component material or assembling demand for tool usually intellectual in this field Give selection.

It is the first embodiment of the planetary-screw of the utility model shown in referring to figure 2. comprising a driving screw 1, One nut 2 and a planetary set 3, the planetary set 3 are located in the nut 2, and are surrounded on around the driving screw 1, make the master Screw rod 1 can be in carrying out linear movement axially with respect to the nut 2 and the planetary set 3, or makes the nut 2 and the planetary set 3 It can be in axially with respect to the driving screw 1 progress linear movement.

The driving screw 1 has an external screw thread 11, which can be located at one end of the driving screw 1, the driving screw 1 An interconnecting piece 12 also having, the interconnecting piece 12 can be located at the other end of the driving screw 1, which can connect one A power device (figure is not painted), allows the driving screw 1 to be driven the rotation.

The nut 2 has the hole for running through two end faces, and the inner wall for forming the nut 2 in the hole can be at single straight The hole of diameter or the inner wall can be the ladder type hole without same diameter, and in the present embodiment, which is step type Hole has a first internal diameter 2a in the inner wall of interlude, and the inner wall for being formed in 2 liang of end edges of nut has the second internal diameter The internal diameter of 2b, second internal diameter 2b are greater than the internal diameter of first internal diameter 2a, preferably, two the second internal diameter 2b with should The also internal diameter with third internal diameter a 2c, each third internal diameter 2c is between the first internal diameter 2a and the between first internal diameter 2a Between the internal diameter of two internal diameter 2b.2 inner wall of nut for forming first internal diameter 2a has an internal screw thread 21, and being formed should 2 inner wall of nut of second internal diameter 2b can be a closely sealed portion 22, and, it is formed in the nut 2 of third internal diameter 2c Wall surface can be a hollow part 23.The nut 2 preferably has at least one through-hole 24 for penetrating through the inner wall, outside wall surface, should At least one each through-hole 24 can be in the closing that can be opened by a plug member 25, fill lubricating oil at least one through-hole 24 In in the nut 2.In addition, the through-hole 24 can be two, and two through-holes 24 when the nut 2 is at fixed when not rotating It respectively can connect an oil guide pipe (figure is not painted), so that lubricating oil is formed circulation by two through-holes 24, have more preferably Lubricant effect.

Referring to figure 2., shown in Fig. 3 and Fig. 4, which has a support construction, which can support more A 33 position rotating of roller, in the present embodiment, the support construction is by being equipped with 32 structures of multiple fixed columns between two fixed plates 31 At the centre of two fixed plates 31 respectively has a perforation 311, which can extend through is somebody's turn to do without contacting Two perforation 311.Each fixed plate 31 also has the multiple assembly holes 312 being surrounded on around the perforation 311, multiple assembly hole 312 are located on the circumference of the same Radius centered on the perforation 311.

Multiple fixed column 32 can be respectively in connection in two fixed plates 31, making multiple fixed column 32 can be with by both ends Be collectively formed stable support construction with two fixed plates 31, multiple fixed column 32 be surrounded on 1 periphery of driving screw not with The driving screw 1 and the nut 2 contact.In the present embodiment, respectively there is one to protrude from this two admittedly at the both ends of each fixed column 32 The engaging portion 321 of fixed board 31, the engaging portion 321 respectively protruded can be combined fixation with an engaging member 322 respectively, in the present embodiment In, which can have external screw thread, which can be a nut；The engaging member 322, which can sink, to be set to The assembly hole 312 or the engaging member 322 can protrude from the outer surface of two fixed plates 31, two fixed plates 31 and The engaging member 322 of the protrusion can correspond to the position third internal diameter 2c of the nut 2, and two fixed plates 31 and the combination Part 322 not with the third internal diameter 2c location contacts.

The both ends of multiple roller 33 respectively have an assembled portion 331, and two assembled portions 331 are each can be arranged in this two For the assembly hole 312 of fixed plate 31 at moving rotary, multiple roller 33 is mutually the same and respectively has external screw thread 332, each external screw thread 332 can be meshed respectively with the internal screw thread 21 of the external screw thread 11 of the driving screw 1 and the nut 2, in this way, in the support construction Not and under the driving screw 1 and the nut 2 contact situation, each roller 33 can phase for two fixed plates 31 and multiple fixed column 32 For the driving screw 1 and the nut 2 revolution and rotation.

The internal screw thread of the external screw thread 332 of the roller 33 and the external screw thread 11 of the driving screw 1 and the nut 2 can be all list Line screw thread or multi start thread, in addition, 11 shape of external screw thread of the driving screw 1 and 21 shape of internal screw thread of the nut 2 are preferably formed It is identical, and 332 shape of external screw thread of the roller 33 preferably with 11 shape of external screw thread of the driving screw 1 and the internal screw thread of the nut 2 21 shapes form difference, as shown in figure 5,11 shape of external screw thread of the driving screw 1 and 21 shape of internal screw thread of the nut 2 are formed The external screw thread 322 of chevron, the roller 33 forms arc chord angle, so, it is possible to reduce the external screw thread 332 of the roller 33 and the master The contact area of the external screw thread 11 of screw rod 1 can reduce the frictional force between two external thread parts 11,332 accordingly, tool It is reduced the effect that noise generates and promotes smooth rotation degree.Relatively, in other embodiments, it also may be selected to make the driving screw 1 11 shape of external screw thread and 21 shape of internal screw thread of the nut 2 form arc chord angle, the external screw thread 332 formation of the roller 33 The form of chevron, the utility model are without restriction.

The center of multiple roller 33 and multiple fixed column 32 preferably on same Radius circumference, and with regular fashion at It is located on to isogonism distribution 1 periphery of driving screw, and, multiple roller 33 is with multiple fixed column 32 preferably at ratio of integers It is arranged, with the roller 33 of identical quantity between the fixed column 32 for keeping any two adjacent.For example, in the present embodiment, the rolling Column 33 and the sum of the fixed column 32 are nine, and the quantity ratio of multiple roller 33 and multiple fixed column 32 is 2:1, whereby, It can make multiple fixed column 32 that can uniformly bear the frictional force that multiple roller 33 revolves with driving screw 1 and nut 2, To reach good force balance.

Referring to figure 2., shown in Fig. 4, the opposite end surface in the axial direction of the nut 2 also each have a closure member 4, the envelope Lubricating oil can be closed in the hole of the nut 2 at the closely sealed portion 22 for being releasably incorporated into the nut 2, the closure member 4 by closing member 4 It is interior, to avoid lubricating oil leakage, to promote the tidiness of working environment, and prevent extraneous dust or foreign matter from falling into the spiral shell Turn space 31, avoids the smooth rotation degree for influencing the nut 2 Yu the driving screw 1.In the present embodiment, it is passed through with a positioning component The nut 2 is worn for fixing the closure member 4, rotates synchronously the closure member 4 with the nut 2, preferably, the closure member Leak-stopping part 34 is preferably had between 4 and the nut 2, is leaked out to avoid lubricating oil by the closure member 4 and 2 junction of nut. The closure member 4 has the hole 41 that stretches through to stretch through for the driving screw 1, axially penetrates through the driving screw 1 in the nut 2 Portion, the hole 41 that stretches through can have internal screw thread 42, and the external screw thread 11 of the internal screw thread 42 and the driving screw 1 is screwed.Whereby, the envelope Closing member 4 and the nut 2 integral can be performed relative motion with the driving screw 1, to be used in a toolroom machine, such as: in modeling In glue Jet forming machine, the closure member 4 and the nut 2 can be at position rotatings, which can make opposite linear shifting It is dynamic, plastics are projected by nozzle；Alternatively, the driving screw 1 can make this at the rotation of positioning in other processing equipments Closure member 4 and the nut 2 can make axially opposite displacement work.

It please refers to shown in Fig. 6, which can also make the envelope as made by the flexible material such as silica gel, rubber The internal screw thread 42 of closing member 4 can fit in the external screw thread 11 of the driving screw 1, to avoid lubricating oil with the rotation of the driving screw 1 And it leaks out.Alternatively, the spiral shell of the external screw thread 11 of the screw pitch D1 and driving screw 1 of the internal screw thread 42 of the closure member 4 can also be passed through Difference is formed away from D2；Or the spiral shell shape of the internal screw thread 42 of the closure member 4 is different from the spiral shell shape of the external screw thread 11 of the driving screw 1； Whereby, the internal screw thread 42 of the closure member 4 and the external screw thread 11 of the driving screw 1 can be further formed it is more close be bonded, and it is logical The material for crossing the closure member 4 has elasticity, will not generate excessive obstruction to the rotation of the driving screw 1, have and promote the envelope The airtightness effect of closing member 4 and the driving screw 1.

It please refers to shown in Fig. 7, is the second embodiment of the utility model planetary-screw, is compared with first embodiment, In the present embodiment, multiple 32 ' of fixed column respectively has 323 ' of external screw thread and mutually the same, and each 323 ' of external screw thread respectively can be with this The external screw thread 11 of driving screw 1 and the internal screw thread 21 of the nut 2 are meshed；Multiple 32 ' of fixed column can be extended through this by both ends Two fixed plates 31 allow 321 ' of engaging portion of multiple 32 ' of fixed column to protrude from two fixed plates 31, and this two A 321 ' of engaging portion is each can be combined by 322 ' of engaging member, and 321 ' of the two basic change portion can be external screw thread, each engaging member 322 ' can be a nut, respectively have a clearance G between each 322 ' of engaging member and two fixed plates 31, which omits Greater than the back lash of the internal screw thread 21 of the external screw thread 11 and nut 2 of 323 ' of the external screw thread and the driving screw 1, in this way, can be with Allow multiple 32 ' of fixed column and two fixed plates 31 that stable support construction is collectively formed, and makes multiple fixed column 32 ' can be relative to two fixed plates 31 at small axial movement.322 ' of the engaging member is same can to sink set on the assembly hole 312 or 322 ' of the engaging member can protrude from outer surface and two fixed plates 31 and the protrusion of two fixed plates 31 322 ' of engaging member not with the third internal diameter 2c location contacts of the nut 2.

By above structure, when the planetary-screw of the utility model acts, the driving screw 1 can be driven to rotate, make to engage Rotation can be formed in multiple roller 33 of the internal screw thread 21 of the external screw thread 11 and nut 2 of the driving screw 1 and is surrounded jointly The driving screw 1 revolves, in this way, the driving screw 1 can make opposite linear movement when the nut 2 is at position rotating, and By the forward and reverse rotation of the driving screw 1, the driving screw 1 is allow to make linear movement repeatedly；Or the driving screw 1 is at positioning Rotation when, the closure member 4 and the nut 2 can make axially opposite displacement, and pass through the forward and reverse rotation of the driving screw 1, The closure member 4 and the nut 2 is set to make linear movement repeatedly.

In conclusion the planetary-screw of the utility model, mainly by the support construction and the driving screw and the nut at Not in contact with, and only engaged by the external screw thread of multiple roller with the internal screw thread of the external screw thread of the driving screw and the nut, make this Multiple rollers are at can be relative to the driving screw and nut at rotation and revolution, on the whole with relatively simple construction and can be with Friction is reduced, in this way, the processing cost of the planetary-screw can be greatly reduced, and production and packaging efficiency can be promoted.And by It is not contacted directly with the driving screw and nut in the support construction, and then formed noise when planetary-screw rotation can be reduced And other effects.In addition, when the planetary-screw of the utility model is used in toolroom machine, can also easily repair and easily Fill lubricating oil and other effects.

Although the utility model is disclosed using above-mentioned preferred embodiment, it is not intended to limit the utility model, Any to be familiar with this those skilled in the art within the spirit and scope for not departing from the utility model, opposite above-described embodiment carries out various changes The technology scope that the utility model is protected is still fallen with modification, therefore the protection scope of the utility model should be with claim Subject to book defines.

Claims (15)

1. a kind of planetary-screw characterized by comprising

One driving screw has an external screw thread and an interconnecting piece；

One nut, the hole of the nut both ends of the surface is run through with one, and the inner wall for forming the hole has an internal screw thread；And

One planetary set has a support construction, and the support construction is for supporting multiple rollers are positioned in the support construction to revolve Turn, multiple roller is mutually the same and has external screw thread, the external screw thread of multiple rollers and the external screw thread of the driving screw and the nut Internal screw thread be meshed.

2. planetary-screw as described in claim 1, which is characterized in that the inner wall is ladder type hole, in the inner wall of interlude Face has first internal diameter, has second internal diameter in the inner wall of two end edge of nut, which is close Conjunction portion, the internal diameter in the closely sealed portion are greater than the internal diameter of first internal diameter, which is located at the first internal diameter position.

3. planetary-screw as described in claim 1, which is characterized in that the nut, which has, penetrates through the inner wall, outside wall surface extremely A few through-hole, at least one through-hole can be in the closing that can be opened by a plug member.

4. planetary-screw as claimed in claim 3, which is characterized in that the through-hole is two, and two through-holes can connect one A oil guide pipe.

5. planetary-screw as described in claim 1, which is characterized in that the support construction is by two fixed plates and multiple fixed columns It is constituted, multiple assembly holes that the centre of two fixed plates respectively has a perforation and is surrounded on around the perforation should Multiple assembly holes are located on the circumference of same Radius centered on the perforated base, the both ends of multiple fixed column respectively in connection with In the assembly hole.

6. planetary-screw as claimed in claim 5, which is characterized in that the both ends of multiple fixed column respectively have protrude from this two One engaging portion of a fixed plate, the engaging portion have external screw thread, and each engaging portion is fixed for an engaging member with threads.

7. planetary-screw as claimed in claim 6, which is characterized in that multiple fixed column respectively has external screw thread and each other phase Together, each external screw thread is able to be meshed with the internal screw thread of the external screw thread of the driving screw and the nut, each engaging member with this two Respectively there is a gap, each gap is greater than the external screw thread of each fixed column and the external screw thread and the spiral shell of the driving screw between fixed plate The back lash of female internal screw thread.

8. planetary-screw as claimed in claim 6, which is characterized in that the engaging member is heavy to be set to the assembly hole.

9. planetary-screw as claimed in claim 6, which is characterized in that the engaging member protrudes from the outer surface of two fixed plates And it is not contacted with the nut.

10. planetary-screw as claimed in claim 5, which is characterized in that the both ends of multiple roller respectively have an assembled portion, Each assembled portion can be arranged in the assembly hole of two fixed plates so as to moving rotary.

11. planetary-screw as claimed in claim 10, which is characterized in that the planet rolling between the adjacent fixed column of any two Column quantity is identical.

12. planetary-screw as described in claim 1, which is characterized in that the closely sealed portion at the nut both ends respectively has a closing Part, the closure member is at being releasably incorporated into the nut.

13. planetary-screw as claimed in claim 12, which is characterized in that the closure member is made of elastic material.

14. planetary-screw as claimed in claim 13, which is characterized in that the closure member is screwed with the driving screw with screw thread, The closure member is different from the externally threaded screw pitch of the driving screw or spiral shell shape.

15. a kind of toolroom machine, which is characterized in that have the planetary-screw as described in any one of claims 1 to 14.