CN203176146U - Screw-joint transmission structure - Google Patents

Screw-joint transmission structure Download PDF

Info

Publication number
CN203176146U
CN203176146U CN 201220680728 CN201220680728U CN203176146U CN 203176146 U CN203176146 U CN 203176146U CN 201220680728 CN201220680728 CN 201220680728 CN 201220680728 U CN201220680728 U CN 201220680728U CN 203176146 U CN203176146 U CN 203176146U
Authority
CN
China
Prior art keywords
thread
joint
steel pipe
hole
drive mechanism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN 201220680728
Other languages
Chinese (zh)
Inventor
朱琦琦
程立
吕军玲
徐刚
马冲
李娟�
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.)
China Three Gorges Corp
China XD Electric Co Ltd
Original Assignee
China Three Gorges Corp
China XD Electric Co Ltd
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 China Three Gorges Corp, China XD Electric Co Ltd filed Critical China Three Gorges Corp
Priority to CN 201220680728 priority Critical patent/CN203176146U/en
Application granted granted Critical
Publication of CN203176146U publication Critical patent/CN203176146U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Landscapes

  • Mutual Connection Of Rods And Tubes (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

The utility model discloses a screw-joint transmission structure which comprises a joint with external threads and a steel tube with internal threads, wherein a stepped hole is formed in one end, extending into the steel tube, of the joint; and annular diagonal planes are arranged at the ends of the steel tube, so uniform force is applied on all threads, and the hidden danger that some part at the root of the threads cracks due to oversized force applied on certain thread is avoided.

Description

A kind of drive mechanism of scyewed joint
Technical field
The utility model belongs to mechanical transmission fields, particularly a kind of drive mechanism of scyewed joint.
Background technique
Scyewed joint is the removable connection that utilizes thread part to constitute, and scyewed joint makes two parts form an integral body by the mutual snap close of internal and external threads on two parts.In the long connecting rod drive mechanism, in order to improve connecting rod strength, reduce connecting rod weight, to save cost, for convenience detach, often adopt the structure of " steel pipe+joint ", namely the steel pipe two ends directly connect with joint by screw thread, form an integral body.The joint dimension at two ends is little, is convenient to structure that the machine addition needs in order to link to each other with other driving parts, as pin hole processing on joint, links to each other with other parts by pin etc.But there is a drawback in this long connecting rod drive mechanism: because thread root stress is concentrated and the influence of screw thread unbalance stress, in the process of tension and compression transferring power repeatedly, be easy to produce fatigue fracture, particularly for the steel pipe of intermediate portion, because screw thread has removed certain wall thickness, it is big to add the steel pipe length dimension, is unfavorable for heat treatment, more is easy to generate fatigue fracture.Fig. 1 is the stressed schematic representation of tradition " steel pipe+joint " structure screw thread, respectively enclose the screw thread discontinuity among Fig. 1, when the stressed drawstring of the steel pipe that has internal thread has externally threaded joint, end circle internal thread on the steel pipe and the stressed maximum of initial circle outside thread on the joint, then be easy to produce stress at end circle internal thread and the externally threaded root of initial circle and concentrate, be easy to generate the phenomenon of fatigue fracture.
The model utility content
The purpose of this utility model is to propose a kind of drive mechanism of scyewed joint, reduces the stress of thread root and concentrates, and makes screw thread stressed evenly, improves the intensity of drive mechanism.
To achieve these goals, the utility model adopts following technological scheme:
A kind of drive mechanism of scyewed joint comprises the steel pipe that has externally threaded joint and have internal thread, and the end that joint stretches into steel pipe is provided with step hole, and the termination of steel pipe is provided with the scarf of annular.
The utility model further improves and is: described step hole is made up of first hole and second hole.
The utility model further improves and is: the degree of depth in described first hole is 2 ~ 4 times of externally threaded pitch, and the degree of depth in second hole is 3 ~ 5 times of externally threaded pitch.
The utility model further improves and is: the diameter in described first hole is 0.6 ~ 0.7 times of outside thread nominal diameter, and the diameter in second hole is 0.4 ~ 0.5 times of outside thread nominal diameter.
The utility model further improves and is: the axis angulation of the profile line of described scarf and steel pipe is 15 ~ 20 °.
The utility model further improves and is: 5 ~ 7 times of the projected length outside thread pitch length of described scarf on the axis of steel pipe.
The utility model further improves and is: joint is provided with the shaft shoulder, and joint and steel pipe scyewed joint are provided with elastic washer between the end of joint and the shaft shoulder.
The utility model further improves and is: the screw-thread ending place of described internal thread has the first annular spron.
The utility model further improves and is: described externally threaded screw-thread ending place has the second annular spron.
The utility model has following beneficial effect with respect to prior art:
The utility model is provided with step hole in the end inside that joint stretches into steel pipe, offer step hole and can reduce near the screw thread rigidity the initial outside thread on the joint, when steel pipe is stressed when socketing, end circle internal thread and the externally threaded initial outside thread of internal thread take the lead in stressed, and stressed maximum in each circle screw thread, the root at end circle internal thread forms stress raisers easily; Because step hole has reduced near the screw thread rigidity the initial outside thread on the joint, after end circle internal thread and initial outside thread are stressed, initial externally threaded stressed will reducing, can better power be delivered on the screw thread of internal thread and externally threaded other circles, respectively to enclose screw thread stressed evenly thereby make, and avoided the hidden danger because of the local cracking of the stressed excessive thread root that causes of a certain circle screw thread.The end that the utility model is connected with joint at steel pipe is provided with the scarf of annular, offer the rigidity that scarf can reduce the screw thread of close end on the steel pipe, when joint is stressed when drawing steel pipe, the initial internal thread of internal thread and externally threaded end circle outside thread take the lead in stressed, scarf has reduced the screw thread rigidity of close end on the steel pipe, the stressed of initial internal thread will reduce, can better power be delivered on the screw thread of internal thread and externally threaded other circles, respectively to enclose screw thread stressed evenly thereby make, avoid the hidden danger because of the local cracking of the stressed excessive thread root that causes of a certain circle screw thread, improved the intensity of scyewed joint drive mechanism.
The utility model further has following beneficial effect: when joint and steel pipe assembling, be provided with elastic washer between the end of steel pipe and the shaft shoulder of joint, by the elastic force of elastic washer, make to produce pretightening force between internal thread and the outside thread to prevent thread looseness.In addition, the utility model has first and second annular spron at the screw-thread ending place of internal and external screw thread, makes things convenient for withdrawing and reduce the last stress that encloses the internal and external screw thread root to concentrate.
Description of drawings
Fig. 1 is the stressed schematic representation of tradition " steel pipe+joint " structure screw thread;
Fig. 2 is the structural representation of steel pipe of the present utility model;
Fig. 3 is the structural representation of joint of the present utility model;
Fig. 4 is steel pipe of the present utility model and the schematic representation that cooperates of joint;
Fig. 5 is the stressed back of the utility model internal and external threads distortion schematic representation;
Wherein: 1 is that joint, 2 is that steel pipe, 3 is that elastic washer, 4 is that internal thread, 5 is that outside thread, 6 is that end, 7 is that the shaft shoulder, 8 is that step hole, 9 is that first hole, 10 is that second hole, 11 is that scarf, 12 is that the second annular spron, 13 is that the first annular spron, 14 is that the last internal thread, 15 that encloses is that initial internal thread, 16 is that initial outside thread, 17 is that the last outside thread, 18 that encloses is axis.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Referring to shown in Fig. 2 to 4, the drive mechanism of a kind of scyewed joint of the utility model, comprise the joint 1 that has outside thread 5 and the steel pipe 2 that has internal thread 4, the end inside that joint 1 stretches into steel pipe 2 is provided with step hole 8, step hole 8 is made up of first hole 9 and second hole 10, the degree of depth in first hole 9 is 2 ~ 4 times of pitch of outside thread 5, the degree of depth in second hole 10 is 3 ~ 5 times of pitch of outside thread 5, the diameter in first hole 9 is 0.6 ~ 0.7 times of outside thread 5 nominal diameters, and the diameter in second hole 10 is 0.4 ~ 0.5 times of outside thread 5 nominal diameters; The termination of steel pipe 2 is provided with the scarf 11 of annular, and axis 18 angulations of the profile line of scarf 11 and steel pipe 2 are 15 ° ~ 20 °, and the projected length of scarf 11 on the axis 18 of steel pipe 2 is 5 times of outside thread 5 pitch; The screw-thread ending place of internal thread 4 has the first annular spron 13, and the screw-thread ending place of outside thread 5 has the second annular spron 12; Referring to Fig. 4, joint 1 is provided with the shaft shoulder 7, when joint 1 and steel pipe 2 assemblings, is provided with elastic washer 3 between the end 6 of steel pipe 2 and the shaft shoulder 7.
When steel pipe 2 is stressed when socketing 1, if there is not step hole 8, it is stressed that the end circle internal thread 14 of internal thread 4 and the initial outside thread 16 of outside thread 5 take the lead in, and in each circle screw thread stressed maximum, therefore form stress raisers at the root of end circle internal thread 14 easily; When step hole 8, because step hole 8 has reduced near the rigidity of the screw thread the initial outside thread 16 on the joint 1, therefore, after end circle internal thread 14 and initial outside thread 16 are stressed, the stressed of initial outside thread 16 will reduce, so just will better power be delivered on the screw thread of other circles of internal thread 4 and outside thread 5, respectively to enclose screw thread stressed evenly thereby make, and avoided the hidden danger because of the local cracking of the stressed excessive thread root that causes of a certain circle screw thread.
When joint 1 is stressed when drawing steel pipe 2, the initial internal thread 15 of internal thread 4 takes the lead in stressed with the end circle outside thread 17 of outside thread 5, because scarf 11 has reduced the rigidity of the screw thread of close termination on the steel pipe 2, therefore, the stressed of initial internal thread 15 will reduce, so just will better power be delivered on the screw thread of other circles of internal thread 4 and outside thread 5, respectively to enclose screw thread stressed evenly thereby make, and avoided the hidden danger because of the local cracking of the stressed excessive thread root that causes of a certain circle screw thread.
The first annular spron 13, the second annular spron 12 make that withdrawing is convenient and reduced last circle internal thread 14 and the stress of end circle outside thread 17 roots is concentrated.Add elastic washer 3 and urgent moment between steel pipe 2 and the joint 1, by the elastic force of elastic washer 3, make to produce pretightening force between internal thread 4 and the outside thread 5 to prevent thread looseness.
The utility model adopts new structure, make and respectively enclose screw thread stressed more even (as shown in Figure 5), avoided the stressed excessive phenomenon of partial screw threads, reduced the stress of thread root and concentrated, improved the intensity of scyewed joint drive mechanism, reduced connecting rod weight simultaneously, saved cost, for convenience detach.

Claims (9)

1. the drive mechanism of a scyewed joint, it is characterized in that: comprise the joint (1) that has outside thread (5) and the steel pipe (2) that has internal thread (4), the end that joint (1) stretches into steel pipe (2) is provided with step hole (8), and the termination of steel pipe (2) is provided with the scarf (11) of annular.
2. the drive mechanism of scyewed joint according to claim 1, it is characterized in that: described step hole (8) is made up of first hole (9) and second hole (10).
3. the drive mechanism of scyewed joint according to claim 2 is characterized in that: the degree of depth in described first hole (9) is 2 ~ 4 times of pitch of outside thread (5), and the degree of depth of second hole (10) is 3 ~ 5 times of pitch of outside thread (5).
4. according to the drive mechanism of claim 2 or 3 described scyewed joint, it is characterized in that: the diameter in described first hole (9) is 0.6 ~ 0.7 times of outside thread (5) nominal diameter, and the diameter of second hole (10) is 0.4 ~ 0.5 times of outside thread (5) nominal diameter.
5. the drive mechanism of scyewed joint according to claim 1, it is characterized in that: axis (18) angulation of the profile line of described scarf (11) and steel pipe (2) is 15 ~ 20 °.
6. the drive mechanism of scyewed joint according to claim 1 or 5, it is characterized in that: the projected length of described scarf (11) on the axis (18) of steel pipe (2) is 5 ~ 7 times of outside thread (5) pitch.
7. the drive mechanism of scyewed joint according to claim 1, it is characterized in that: joint (1) is provided with the shaft shoulder (7), joint (1) and steel pipe (2) scyewed joint are provided with elastic washer (3) between the end (6) of joint (1) and the shaft shoulder (7).
8. the drive mechanism of scyewed joint according to claim 1, it is characterized in that: the screw-thread ending place of described internal thread (4) has the first annular spron (13).
9. the drive mechanism of scyewed joint according to claim 1, it is characterized in that: the screw-thread ending place of described outside thread (5) has the second annular spron (12).
CN 201220680728 2012-12-11 2012-12-11 Screw-joint transmission structure Expired - Lifetime CN203176146U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220680728 CN203176146U (en) 2012-12-11 2012-12-11 Screw-joint transmission structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220680728 CN203176146U (en) 2012-12-11 2012-12-11 Screw-joint transmission structure

Publications (1)

Publication Number Publication Date
CN203176146U true CN203176146U (en) 2013-09-04

Family

ID=49072848

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201220680728 Expired - Lifetime CN203176146U (en) 2012-12-11 2012-12-11 Screw-joint transmission structure

Country Status (1)

Country Link
CN (1) CN203176146U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109519447A (en) * 2018-11-28 2019-03-26 中国航空工业集团公司西安飞行自动控制研究所 Reduce the servo valve oily filter skeleton structure of screw thread stress

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109519447A (en) * 2018-11-28 2019-03-26 中国航空工业集团公司西安飞行自动控制研究所 Reduce the servo valve oily filter skeleton structure of screw thread stress

Similar Documents

Publication Publication Date Title
CN202187997U (en) Anti-rotation rivet-turning type self-locking nut
CN202560769U (en) Check bolt and nut connecting pair
CN201739292U (en) Positioning pin for automobile assembling clamp
CN203176146U (en) Screw-joint transmission structure
CN202611729U (en) Steel strand anchor rod
CN203730588U (en) Coupler
CN204942463U (en) Detachable gear wheel axle
CN204784284U (en) Separation and reunion separator
CN203604457U (en) Reliable gapless connection device for shaft
CN206478071U (en) There is carpenter's hardware-joint of flange face
CN202326908U (en) Shackle with counter bores
CN202520729U (en) Novel screw-thread steel connecting sleeve
CN204784005U (en) Interior threaded fastener
CN207974926U (en) A kind of wind driven generator principal shaft assembly
CN207010380U (en) The fastening structure of integral machine rotor
CN204099437U (en) A kind of transmission coupling
CN204152937U (en) For vibrating the threaded anti-loosing structure on the main shaft larger with impact force
CN205533669U (en) Cylinder head stud
CN219953903U (en) Fixing bolt
CN202883624U (en) Self-tapping and thread-sectioning coupling screw
CN201437812U (en) Connecting bolt for windmill
CN202882516U (en) Hollow thin-wall cross arm made of composite materials
CN202251288U (en) Connecting piece for nylon core rods
CN208185401U (en) A kind of mechanical gear easy to repair
CN204253912U (en) The combustion gas pipe valve that energy centering connects

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CX01 Expiry of patent term
CX01 Expiry of patent term

Granted publication date: 20130904