CN111089147B - Microminiature precision transmission device suitable for friction load - Google Patents
Microminiature precision transmission device suitable for friction load Download PDFInfo
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- CN111089147B CN111089147B CN202010015546.XA CN202010015546A CN111089147B CN 111089147 B CN111089147 B CN 111089147B CN 202010015546 A CN202010015546 A CN 202010015546A CN 111089147 B CN111089147 B CN 111089147B
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- guide rod
- connecting block
- angular contact
- hole
- movable guide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H21/00—Gearings comprising primarily only links or levers, with or without slides
- F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
- F16H21/16—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and reciprocating motion
- F16H21/18—Crank gearings; Eccentric gearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a microminiature precision transmission device suitable for friction load, which comprises a connecting assembly, a movable guide rod and a driving crank, wherein the connecting assembly comprises a connecting block, a transmission pin shaft, two angular contact bearings and two angular contact bearing covers; the movable guide rod is horizontally arranged, one end of the movable guide rod is fixedly connected to the connecting block, the other end of the movable guide rod extends into an external horizontal guide groove, and the longitudinal direction of the horizontal guide groove extends leftwards and rightwards; one end of the driving crank, which is close to the connecting block, is provided with a U-shaped part, and the U-shaped part extends into the crank connecting hole; the transmission pin shaft is positioned in the opening of the U-shaped part and is used for alternately contacting with the two inner walls of the U-shaped part and rolling on the inner wall of the U-shaped part when the U-shaped part rotates around a vertical line, so that the movable guide rod is driven to move left and right along the longitudinal direction of the horizontal guide groove. The invention has stronger adaptability and can obviously improve the system efficiency and the transmission precision. The device structure is dismantled conveniently, repeatedly usable, and is with low costs, can use under the high temperature operating mode.
Description
Technical Field
The invention belongs to the field of transmission devices, and particularly relates to a micro-miniature precision transmission device.
Background
In the field of precision transmission, from rotation to reciprocation, the most typical structure is a crank-moving guide mechanism, the rotation of a driving crank is converted into reciprocation of an output moving guide, in the structure, the moving guide bears constant load, the load can be zero, the motion track of the moving guide is strictly limited on a straight line, the moving guide can only obtain instant pause at the end of each motion, in order to obtain longer pause, the motion track at the output end of the crank is changed from a straight line to an arc, and the radius of the arc is equal to the rotation radius of the input crank.
When the movable guide rod bears friction load, the friction load borne by the movable guide rod is increased and the motion track of the movable guide rod deviates in the radial direction due to the reasons that the external acting force of the system is unstable and the dynamic characteristics are inconsistent. Because the output movable guide rod is in rigid connection, the output movable guide rod and the output movable guide rod can cause the reduction of system efficiency and the deterioration of transmission precision, and even directly cause the locking of the movable guide rod to cause the system failure.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a miniature precision transmission device suitable for friction load, which has simple structure and reliable work and can obviously improve the system efficiency and the transmission precision.
To achieve the above objects, according to one aspect of the present invention, there is provided a micro-miniature precision actuator suitable for friction load, characterized by comprising a connecting assembly, a moving guide and a driving crank, wherein,
the connecting assembly comprises a connecting block, a transmission pin shaft, two angular contact bearings and two angular contact bearing covers, wherein an angular contact bearing mounting hole which is through up and down is formed in the connecting block, the upper end and the lower end of the angular contact bearing mounting hole of the connecting block are respectively sleeved with one angular contact bearing, the upper end and the lower end of the connecting block are respectively provided with one angular contact bearing cover at the position corresponding to the angular contact bearing, the transmission pin shaft is vertically arranged, the upper end and the lower end of the transmission pin shaft are respectively arranged on an inner ring of one angular contact bearing, and a crank connecting hole which is communicated with the angular contact bearing mounting hole is formed in the front side of the connecting block;
the movable guide rod is horizontally arranged, one end of the movable guide rod is fixedly connected to the connecting block, the other end of the movable guide rod extends into an external horizontal guide groove, and the horizontal guide groove longitudinally extends left and right;
one end of the driving crank, which is close to the connecting block, is provided with a U-shaped part, and the U-shaped part extends into the crank connecting hole;
the transmission pin shaft is positioned in the opening of the U-shaped part and used for alternately contacting with the two inner walls of the U-shaped part and rolling on the inner wall of the U-shaped part when the U-shaped part rotates around a vertical line, so that the moving guide rod is driven to move left and right along the longitudinal direction of the horizontal guide groove.
Preferably, a movable guide rod connecting hole is horizontally formed in the left side of the connecting block, internal threads are formed in the inner wall of the connecting block at the movable guide rod connecting hole, and the movable guide rod is fixedly connected to the connecting block through the internal threads.
Preferably, the connecting hole of the moving guide rod is a stepped hole and comprises a large hole and a small hole, the large hole is arranged on the left side of the small hole, the large hole is a smooth hole, and the inner wall of the connecting block at the small hole is provided with the internal thread.
Preferably, the right side of the connecting block is also horizontally provided with a moving guide rod connecting hole, and the moving guide rod connecting hole on the right side of the connecting block is bilaterally symmetrical to the moving guide rod connecting hole on the left side of the connecting block;
each movable guide rod connecting hole is connected with one movable guide rod through an internal thread.
Preferably, the coaxiality of the left and right macropores is less than 0.008 mm.
Preferably, one end of the moving guide rod close to the connecting block is provided with a shaft shoulder, and the shaft shoulder is abutted with the outer side of the connecting block.
Preferably, one end of each angular contact bearing cover close to the angular contact bearing is provided with an annular boss, and the annular boss abuts against the outer ring of the angular contact bearing at the corresponding position.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1) the driving crank is simple in structure, the open U-shaped part is designed to be convenient to use, the connecting block can be inserted from the connecting hole of the curved groove to use, and the movable guide rod can be conveniently driven to move by the rotation of the driving crank.
2) The connecting block and the movable guide rod connecting structure is simple and easy to process, and can effectively ensure the coaxiality and the axial positioning precision of the rigid movable guide rods on the two sides, thereby ensuring the transmission precision.
3) Aiming at the conditions that the friction load borne by the movable guide rod is increased and the movement track of the movable guide rod deviates in the radial direction due to the reasons of unstable external acting force, inconsistent dynamic characteristics and the like, the invention has stronger adaptability and can obviously improve the system efficiency and the transmission precision. The device structure is dismantled conveniently, repeatedly usable, and is with low costs, can use under the high temperature operating mode.
4) According to the invention, by arranging the angular contact bearing, the radial clearance and the axial small displacement of the angular contact bearing can be utilized to offset the extra offset displacement of the movable guide rod caused by external reasons, so that the movable guide rod is reduced to bear extra load, and the transmission precision and efficiency of the device are improved.
5) The invention has the advantages of small occupied space, stable transmission, convenient assembly and disassembly, reusability and high repeated utilization rate.
Drawings
Fig. 1 is an exploded schematic view of the present invention.
Fig. 2 is a schematic cross-sectional view of the present invention.
FIG. 3 is a schematic view of the drive crank of the present invention;
fig. 4 is a sectional view of the connector block of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 4, a microminiature precision transmission device suitable for friction load is characterized by comprising a connecting assembly 2, a moving guide rod 3 and a driving crank 1, wherein,
the connecting assembly 2 comprises a connecting block 21, a transmission pin shaft 25, two angular contact bearings 22 and two angular contact bearing covers 23, wherein an angular contact bearing mounting hole 211 which penetrates through the connecting block 21 from top to bottom is arranged on the connecting block 21, the angular contact bearings 22 are respectively sleeved at the upper end and the lower end of the angular contact bearing mounting hole 211 of the connecting block 21, the angular contact bearing covers 23 are respectively arranged at the upper end and the lower end of the connecting block 21 at positions corresponding to the angular contact bearings 22, the angular contact bearing covers 23 are preferably fixed on the connecting block 21 through screws 24, one end of each angular contact bearing cover 23 close to the angular contact bearing is provided with an annular boss 231, the annular boss 231 abuts against the outer ring of the angular contact bearing 22 at the corresponding position, the transmission pin shaft 25 is vertically arranged, and the upper end and the lower end of the transmission pin shaft 25 are respectively arranged on the inner ring of, a crank connecting hole communicated with the angular contact bearing mounting hole 211 is formed in the front side of the connecting block 21;
the moving guide rod 3 is horizontally arranged, one end of the moving guide rod is fixedly connected to the connecting block 21, the other end of the moving guide rod extends into an external horizontal guide groove, and the longitudinal direction of the horizontal guide groove extends leftwards and rightwards;
one end of the driving crank 1 close to the connecting block 21 is provided with a U-shaped part 11, and the U-shaped part 11 extends into the crank connecting hole;
the transmission pin shaft 25 is located in the opening 12 of the U-shaped portion 11, and is used for alternately contacting with the two inner walls of the U-shaped portion 11 and rolling on the inner walls of the U-shaped portion 11 when the U-shaped portion 11 rotates around a vertical line, so as to drive the moving guide rod 3 to move left and right along the longitudinal direction of the horizontal guide groove.
Further, a moving guide rod connecting hole 212 is horizontally formed in the left side of the connecting block 21, an internal thread 213 is formed in the inner wall of the connecting block 21 at the moving guide rod connecting hole 212, and the moving guide rod 3 is fixedly connected to the connecting block 21 through the internal thread 213. Preferably, the moving guide connecting hole 212 is a stepped hole and includes a large hole 214 and a small hole 215, the large hole 214 is located at the left side of the small hole 215, the large hole 214 is a light hole, and the inner wall of the connecting block 21 at the small hole 215 is provided with the internal thread 213; furthermore, the right side of the connecting block 21 is also horizontally provided with a moving guide connecting hole 212, the moving guide connecting hole 212 on the right side of the connecting block 21 is bilaterally symmetrical to the moving guide connecting hole 212 on the left side of the connecting block 21, and the coaxiality of the left and right large holes is less than 0.008 mm. Each moving guide rod connecting hole 212 is connected with one moving guide rod 3 through an internal thread 213, a shaft shoulder 31 is arranged at one end of the moving guide rod 3 close to the connecting block 21, and the shaft shoulder 31 is abutted against the outer side of the connecting block 21. The part of the outer side of the movable guide rod 3, which is in contact with the large hole 214, is an outer circular surface, and has higher coaxiality requirements with the large hole 214 and the axis of the movable guide rod 3, the part is in small clearance fit with the large hole 214, the plane of the convex shoulder of the movable guide rod 3 and the axis of the movable guide rod 3 have higher verticality requirements, the movable guide rod 3 and the connecting block 21 jointly ensure the coaxiality of the movable guide rod 3 and the large hole 214 of the connecting block 21 after the movable guide rod 3 is connected with the connecting block 21, the convex shoulder can ensure that the movable guide rod 3 can bear larger friction load in the working process of the device, and the effective friction load is transmitted to the threads of the movable guide.
The U-shaped part 11 of the driving crank 1 can be made of non-metal materials with certain strength, and the motion precision of the transmission pin shaft 25 rolling on the two inner walls of the U-shaped part 11 alternately is ensured under the condition of smaller clearance fit of the U-shaped part 11 and the transmission pin shaft 25, so that the transmission precision is ensured. In addition, in order to ensure the radial positioning accuracy of the connecting block 21, the thickness dimension (the dimension from the upper end to the lower end) of the U-shaped portion 11 is in medium clearance fit with the upper and lower opening dimensions of the crank connecting hole of the connecting block 21, and the rotation angle of the connecting block 21 around the axis of the moving guide rod 3 is ensured to be not more than 0.2 °. In addition, the left and right openings of the crank attachment holes of the attachment block 21 are sized so as not to interfere with the rotation of the U-shaped portion 11 of the attachment block 21.
When an experiment is carried out, the driving crank 1 is driven by an external power source (such as a motor) to rotate around a vertical line, the U-shaped part 11 also swings left and right around the vertical line, when the friction load borne by the moving guide rod 3 is increased due to the fact that external acting force is unstable, dynamic characteristics are inconsistent and the like, and the moving track of the moving guide rod 3 deviates in the radial direction, the moving guide rod 3 and the connecting block 21 are fixedly connected, and the radial deviation is transmitted to the outer ring of the connecting block 21 and the angular contact bearing 22, so that the clearance of the angular contact bearing 22 inside the connecting block 21 and the displacement of the inner ring and the outer ring offset the deviation of the moving guide rod 3, the additional load borne by the moving guide rod 3 is further reduced, and the moving precision and the efficiency of the transmission device are improved.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A microminiature precision transmission device suitable for friction load is characterized by comprising a connecting assembly, a movable guide rod and a driving crank, wherein,
the connecting assembly comprises a connecting block, a transmission pin shaft, two angular contact bearings and two angular contact bearing covers, wherein an angular contact bearing mounting hole which is through up and down is formed in the connecting block, the upper end and the lower end of the angular contact bearing mounting hole of the connecting block are respectively sleeved with one angular contact bearing, the upper end and the lower end of the connecting block are respectively provided with one angular contact bearing cover at the position corresponding to the angular contact bearing, the transmission pin shaft is vertically arranged, the upper end and the lower end of the transmission pin shaft are respectively arranged on an inner ring of one angular contact bearing, and a crank connecting hole which is communicated with the angular contact bearing mounting hole is formed in the front side of the connecting block;
the movable guide rod is horizontally arranged, one end of the movable guide rod is fixedly connected to the connecting block, the other end of the movable guide rod extends into an external horizontal guide groove, and the horizontal guide groove longitudinally extends left and right;
one end of the driving crank, which is close to the connecting block, is provided with a U-shaped part, and the U-shaped part extends into the crank connecting hole;
the transmission pin shaft is positioned in the opening of the U-shaped part and is used for alternately contacting with the two inner walls of the U-shaped part and rolling on the inner wall of the U-shaped part when the U-shaped part rotates around a vertical line, so that the moving guide rod is driven to move left and right along the longitudinal direction of the horizontal guide groove;
when the friction load borne by the movable guide rod is increased and the motion track of the movable guide rod is deviated in the radial direction, the radial deviation is transmitted to the connecting block and the outer ring of the angular contact bearing, the clearance of the angular contact bearing in the connecting block and the displacement of the inner ring and the outer ring offset the deviation of the movable guide rod, so that the extra load borne by the movable guide rod is reduced, and the motion precision and the efficiency of the transmission device are improved.
2. A micro precision actuator suitable for friction load as claimed in claim 1, wherein the left side of the connecting block is horizontally provided with a moving guide connecting hole, the connecting block is provided with an internal thread on the inner wall of the moving guide connecting hole, and the moving guide is fixedly connected to the connecting block through the internal thread.
3. A miniature precision actuator as claimed in claim 2, wherein said moving guide connecting hole is a stepped hole comprising a large hole and a small hole, the large hole is at the left side of the small hole and the large hole is a smooth hole, said connecting block is provided with said internal thread on the inner wall at the small hole.
4. The micro-miniature precision transmission device suitable for friction load as claimed in claim 3, wherein the right side of the connecting block is also horizontally provided with a moving guide rod connecting hole, and the moving guide rod connecting hole on the right side of the connecting block is bilaterally symmetrical to the moving guide rod connecting hole on the left side of the connecting block;
each movable guide rod connecting hole is connected with one movable guide rod through an internal thread.
5. A miniature precision actuator as claimed in claim 4 in which the right and left large apertures are less than 0.008mm coaxial.
6. A miniature precision actuator suitable for friction loads as claimed in claim 2 wherein said end of said movement guide rod adjacent to the connecting block is provided with a shoulder and said shoulder abuts the outside of said connecting block.
7. The miniature precision transmission device suitable for friction load as claimed in claim 1, wherein each of said angular contact bearing covers has an annular boss at one end near the angular contact bearing, and the annular boss abuts against the outer ring of the angular contact bearing at the corresponding position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015546.XA CN111089147B (en) | 2020-01-07 | 2020-01-07 | Microminiature precision transmission device suitable for friction load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015546.XA CN111089147B (en) | 2020-01-07 | 2020-01-07 | Microminiature precision transmission device suitable for friction load |
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| Publication Number | Publication Date |
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| CN111089147A CN111089147A (en) | 2020-05-01 |
| CN111089147B true CN111089147B (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010015546.XA Active CN111089147B (en) | 2020-01-07 | 2020-01-07 | Microminiature precision transmission device suitable for friction load |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5458577U (en) * | 1977-09-30 | 1979-04-23 | ||
| CA1062975A (en) * | 1975-09-19 | 1979-09-25 | Homer J. Shafer | Piston operator for imparting rotary motion |
| US4334436A (en) * | 1980-08-21 | 1982-06-15 | F. Jos. Lamb Company | Bearing arrangement for oscillating shafts |
| CN102478120A (en) * | 2010-11-19 | 2012-05-30 | 董峰 | Rotary valve driving device |
| CN102562449A (en) * | 2011-12-26 | 2012-07-11 | 中科恒源科技股份有限公司 | Stepless blade pitch transformation system of medium and small power wind-driven generator |
| CN207728728U (en) * | 2017-12-29 | 2018-08-14 | 南京通派光电科技有限公司 | A kind of slide block device |
-
2020
- 2020-01-07 CN CN202010015546.XA patent/CN111089147B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1062975A (en) * | 1975-09-19 | 1979-09-25 | Homer J. Shafer | Piston operator for imparting rotary motion |
| JPS5458577U (en) * | 1977-09-30 | 1979-04-23 | ||
| US4334436A (en) * | 1980-08-21 | 1982-06-15 | F. Jos. Lamb Company | Bearing arrangement for oscillating shafts |
| CN102478120A (en) * | 2010-11-19 | 2012-05-30 | 董峰 | Rotary valve driving device |
| CN102562449A (en) * | 2011-12-26 | 2012-07-11 | 中科恒源科技股份有限公司 | Stepless blade pitch transformation system of medium and small power wind-driven generator |
| CN207728728U (en) * | 2017-12-29 | 2018-08-14 | 南京通派光电科技有限公司 | A kind of slide block device |
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| CN111089147A (en) | 2020-05-01 |
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