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CN104879463A - Gear enabling screw rod to move axially and movement mechanism - Google Patents

Gear enabling screw rod to move axially and movement mechanism Download PDF

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Publication number
CN104879463A
CN104879463A CN201510222186.XA CN201510222186A CN104879463A CN 104879463 A CN104879463 A CN 104879463A CN 201510222186 A CN201510222186 A CN 201510222186A CN 104879463 A CN104879463 A CN 104879463A
Authority
CN
China
Prior art keywords
gear
leading screw
screw rod
motion
transmission
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.)
Pending
Application number
CN201510222186.XA
Other languages
Chinese (zh)
Inventor
曹林逸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan University
Original Assignee
Sichuan University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sichuan University filed Critical Sichuan University
Priority to CN201510222186.XA priority Critical patent/CN104879463A/en
Publication of CN104879463A publication Critical patent/CN104879463A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H37/00Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H25/00Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20Screw mechanisms
    • F16H25/24Elements essential to such mechanisms, e.g. screws, nuts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H25/00Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20Screw mechanisms
    • F16H25/24Elements essential to such mechanisms, e.g. screws, nuts
    • F16H25/2409Elements essential to such mechanisms, e.g. screws, nuts one of the threads being replaced by elements specially formed for engaging the screw or nut, e.g. pins, racks, toothed belts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H2702/00Combinations of two or more transmissions

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

The invention belongs to the field of screw rod transmission control and discloses a gear enabling a screw rod to move axially and a movement mechanism. The gear is characterized in that the outer periphery of the transmission gear is provided with teeth which can be meshed with other gears or a synchronous belt to realize transmission, and the inner periphery of the transmission gear is provided with an internal thread which can be in meshed transmission with the screw rod. The movement mechanism takes the gear as a motion body, the screw rod axially pushes a driven part along rotation of the gear, the rotation motion can be converted into linear motion according to leads in corresponding specifications, and the driven part is fixedly connected with the tail end of the screw rod to realize linear motion correspondingly. The gear enabling the screw rod to move axially and the movement mechanism have the advantages that firstly, the problem of difficulty in enabling the screw rod to move axially is solved; secondly, mechanical equipment which adopts the gear and the movement mechanism enables a mechanical transmission mechanism to be simplified greatly; thirdly, since the driven part is fixedly connected with the tail end of the screw rod to realize linear motion, the screw rod is insusceptible to bending stress generated by the driven part radially and protected from serious deformation.

Description

A kind of leading screw is in axial direction moved gear and motion
Technical field
The invention belongs to lead screw transmission control field, particularly a kind of leading screw is in axial direction moved gear and relative motion mechanism, for the production of in the machinery facilities such as batching, simplify mechanical transmission structure, eliminate leading screw by the impact radially bending stress.
Background technique
Control in application in lead screw transmission, machinery uses lead screw pair to be mostly based on leading screw, the rotation motion of self is converted into the straight line motion of nut, drives Passive part by nut.At present, clear and definite a kind of mechanism that leading screw is moved vertically is not also had.Screw mechanism has slip friction mechanisms and two kinds, rolling friction mechanism.In present many machinery, be mostly that the ball screw used is used for rotation motion to be converted into straight line motion.Mostly ball screw pair is using ball screw as main movement, when ball screw is as active body, nut on leading screw will change into straight line motion with the rotation angle of screw mandrel according to the helical pitch of corresponding specification, passive workpiece can be connected with nut by nut seat, thus realizes corresponding straight line motion.But realize rotation motion to be converted into straight line motion with leading screw, Passive part needs to be connected with nut by nut seat.If run into accurate small mechanical equipment just to seem excessive cumbersome and complicated.Maximum defect be leading screw in transmission process, leading screw can affect by the flexural stress of nut transmission, and leading screw can gross distortion, thus affects the overall positioning precision of machinery.
Summary of the invention
The object of this invention is to provide a kind of leading screw is in axial direction moved gear and motion, leading screw is made in axial direction to promote Passive part, realize straight line motion, simplify mechanical motion mechanism, and leading screw is by affecting from Passive part flexural stress radially, there will not be the situation of gross distortion, thus improve the overall positioning precision of machinery.
In order to realize above object, present invention employs following technological scheme: a kind of leading screw is in axial direction moved gear and motion, gear it is characterized in that driving gear external diameter has can with the teeth of Timing Belt or other meshed transmission gear, internal diameter has can with the internal thread of leading screw engagement driving; Motion is for moving person with gear of the present invention, gears meshing is on leading screw, gear both sides are arranged on bearing, leading screw in axial direction can promote Passive part with the rotation of gear, straight line motion is changed into according to the helical pitch of corresponding specification, Passive part is fixedly connected with leading screw end, thus realizes corresponding straight line motion.
For preventing gear and leading screw from coming off, the effective interaction length of leading screw must be greater than the range distance of Passive part.
Beneficial effect of the present invention is:
1), provide a kind of leading screw can be made in axial direction to move gear and motion, take gear as moving person, leading screw in axial direction can move with the rotation of gear, thus solves the problem that leading screw is in axial direction moved.
2), produce batching machine equipment and use gear of the present invention and mechanism thereof, eliminate original above nut body, mechanical transmission positioning means is simplified widely.
3), Passive part is fixedly connected with leading screw end, realizes straight line motion, and leading screw by affecting from Passive part flexural stress radially, not there will not be the situation of gross distortion, thus improve the overall positioning precision of machinery when leading screw is long.
4), use the designs simplification that the machinery of gear of the present invention and motion thereof is relevant, greatly save material, saved cost significantly thus.
Accompanying drawing explanation
Fig. 1 is the sectional view of gear of the present invention.
Fig. 2 is the motion schematic diagram of gear of the present invention.
Fig. 3 is the production proportioner using mechanism of the present invention.
The implication marked in figure is as follows:
1-gear 2-leading screw 3-bearing 4-piston (Passive part) 5-piston cylinder 6-one-way valve
Embodiment
Gear of the present invention as shown in Figure 1, it is characterized in that driving gear external diameter has can with the teeth of Timing Belt or other meshed transmission gear, internal diameter has can with the internal thread of leading screw engagement driving; Motion as shown in Figure 2, for moving person with this gear (1), leading screw (2) in axial direction can promote Passive part with the rotation of gear, straight line motion is changed into according to the helical pitch of corresponding specification, Passive part is fixedly connected with leading screw (2) end, thus realizes corresponding straight line motion.
Below in conjunction with accompanying drawing 3, preferred embodiment is elaborated.It is emphasized that it is only exemplary that following example illustrates, instead of in order to limit the scope of the invention and apply.
For making the object, technical solutions and advantages of the present invention clearly understand, in conjunction with the example of the accurate proportioner of concrete fluid, the present invention is further described.
Concrete implementation step is as follows:
1) according to fluid element requirement, design ingredient sector as shown in Figure 3.Select suitable leading screw, specify the basic parameter of leading screw (2), comprise nominal diameter, helical pitch, head number etc.Required known to required fluid volume V by dispensing fluids, the amount of feed S that leading screw (2) drives piston (4) to move 1for: in formula, A is the cross-section area of piston cylinder (5); Require to complete in stipulated time T, then the speed V that moves vertically of leading screw 1for: the angular velocity of leading screw for: in formula, P is guide screw lead; The driving torque of leading screw j in formula 1for screw turns inertia, for the angular velocity of leading screw.
2) this example selects slip friction mechanisms as engagement pair.Coordinated from engagement driving, gear and leading screw belong to internal messing, there is transmission self-locking critical angle λ, should follow reference books, making the lead angle of gear and leading screw when designing engagement the normal transmission of ability, engagement driving efficiency ρ ' is equivalent friction angle.If select rolling friction mechanism to be engagement pair, ball screw pair friction hinders minimum, locking phenomenon can not occur with during gear transmission.
3) gear parameter design: the screw thread of gear internal diameter should according to the parameter such as size design nominal diameter, helical pitch, head number with leading screw correct engagement, and the teeth in the outside diameter of gear etc. are then according to existing gear rules design.
4) the associated actuator accounting equation of gear and leading screw engagement pair: ignore frictional influence, gear angular velocity gear moment j in formula 2for pinion rotation inertia; Gear linear velocity V 2for: d in formula 2for gear nominal diameter; Velocity ratio d in formula 1for leading screw nominal diameter; Transmission speed ratio in formula, P is guide screw lead; Driving torque ratio
5) processing method of gear: this example selects slip friction mechanisms, after the parameter on the inside and outside footpath of gear determines, after the teeth on common gear working method machining gears external diameter, internal diameter processing is used tapping method instead and is reached relevant Bite size requirement; But select rolling friction mechanism, the processing method of gear internal diameter then will according to the nut processing method for inside diameter processing on existing ball screw pair.
6), after assembling fluid element device according to Fig. 3 with correct assembly method, available Timing Belt or other gear control this device as power source transmission.
Some common practise the present invention belonging to those skilled in the art are unspecified.

Claims (4)

1. the gear making leading screw in axial direction move and a motion thereof, the external diameter that it is characterized in that driving gear has can with the teeth of Timing Belt or other meshed transmission gear, internal diameter has can with the internal thread of leading screw engagement driving; Motion is based on gear, and leading screw in axial direction can move with the rotation of gear, is converted into straight line motion according to the helical pitch of corresponding specification, and passive workpiece by being connected with leading screw end, thus realizes corresponding straight line motion.
2. motion according to claim 1 has slip friction mechanisms and rolling friction mechanism two kinds of forms.
3. the design of motion according to claim 1 and using method thereof.
4. the correlation computations formula related to when using motion according to claim 1:
Leading screw is movement velocity V vertically 1for: s in formula 1for leading screw drives the amount of feed of Passive part motion, T is run duration;
Leading screw angular velocity for: in formula, P is guide screw lead;
Lead screw transmission moment j in formula 1for screw turns inertia, for the angular velocity of leading screw;
Gear angular velocity
Gear moment j in formula 2for pinion rotation inertia, for the angular velocity of gear;
Velocity ratio d in formula 1for leading screw nominal diameter, D 2for gear nominal diameter;
Transmission speed ratio
Driving torque ratio .
CN201510222186.XA 2015-05-05 2015-05-05 Gear enabling screw rod to move axially and movement mechanism Pending CN104879463A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510222186.XA CN104879463A (en) 2015-05-05 2015-05-05 Gear enabling screw rod to move axially and movement mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510222186.XA CN104879463A (en) 2015-05-05 2015-05-05 Gear enabling screw rod to move axially and movement mechanism

Publications (1)

Publication Number Publication Date
CN104879463A true CN104879463A (en) 2015-09-02

Family

ID=53947076

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510222186.XA Pending CN104879463A (en) 2015-05-05 2015-05-05 Gear enabling screw rod to move axially and movement mechanism

Country Status (1)

Country Link
CN (1) CN104879463A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101059165A (en) * 2006-12-19 2007-10-24 兰州理工大学 Lead screw nut pair transmission control device and method, nut subassembly processing method
US20120079902A1 (en) * 2009-08-10 2012-04-05 Schaeffler Technologies Gmbh & Co. Kg Ball screw drive having an axially supported threaded spindle
CN102947620A (en) * 2010-04-26 2013-02-27 日本精工株式会社 Linear actuator
CN103174810A (en) * 2011-12-22 2013-06-26 株式会社日立制作所 Roller screw
CN104160176A (en) * 2012-02-17 2014-11-19 Ntn株式会社 Electric linear actuator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101059165A (en) * 2006-12-19 2007-10-24 兰州理工大学 Lead screw nut pair transmission control device and method, nut subassembly processing method
US20120079902A1 (en) * 2009-08-10 2012-04-05 Schaeffler Technologies Gmbh & Co. Kg Ball screw drive having an axially supported threaded spindle
CN102947620A (en) * 2010-04-26 2013-02-27 日本精工株式会社 Linear actuator
CN103174810A (en) * 2011-12-22 2013-06-26 株式会社日立制作所 Roller screw
CN104160176A (en) * 2012-02-17 2014-11-19 Ntn株式会社 Electric linear actuator

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PB01 Publication
EXSB Decision made by sipo to initiate substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
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Application publication date: 20150902