CN113606308B - Floating gear driven parallelogram mechanism - Google Patents
Floating gear driven parallelogram mechanism Download PDFInfo
- Publication number
- CN113606308B CN113606308B CN202110820341.3A CN202110820341A CN113606308B CN 113606308 B CN113606308 B CN 113606308B CN 202110820341 A CN202110820341 A CN 202110820341A CN 113606308 B CN113606308 B CN 113606308B
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- Prior art keywords
- gears
- floating
- fixed shaft
- gear
- central body
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- 230000007246 mechanism Effects 0.000 title claims abstract description 42
- 238000005452 bending Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 4
- 230000033001 locomotion Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000005489 elastic deformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/12—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types
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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
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
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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
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/028—Gearboxes; Mounting gearing therein characterised by means for reducing vibration or noise
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a parallelogram mechanism driven by a floating gear. Two gears are respectively fixedly connected to two connecting frames of the parallelogram mechanism and serve as fixed shaft gears, an odd number of gears which are meshed with each other are arranged between the two fixed shaft gears and serve as floating gears, wherein the floating gears positioned in the middle are arranged on an elastic support, and radial pressure is formed on the rest floating gears and the fixed shaft gears; the rest floating gears are all arranged on the sliding block, so that radial pressure generated by the floating gears positioned in the middle can be transmitted to the two fixed shaft gears directly or sequentially through the rest floating gears. The mechanism solves the problem that the force transmission characteristic of the mechanism is too poor near the collinear position of the four bars when the parallelogram mechanism is singly used, thereby obviously reducing the vibration of the mechanism; the synchronous contradiction between two parallel transmission chains caused by manufacturing errors is overcome, the gear transmission backlash can be eliminated, and the running noise is reduced.
Description
Technical Field
The invention relates to a parallelogram mechanism and a structure, in particular to a floating gear-driven parallelogram mechanism capable of stably moving.
Background
The most common approach in use of parallelogram mechanisms is where one side link acts as a driving member and the link and the other side link act as a driven member. In theory, the rotating speeds of the two side link rods of the mechanism are consistent, and the connecting rods do parallel motion; in practice, however, the rotational speeds of the two side links are not identical due to manufacturing errors and gaps in the hinges, and the movement of the links is not parallel. Since the transmission angle of the mechanism is zero in the four-bar collinear position, the force transmission characteristics near this position are poor: this not only results in a mechanism that has a very high fluctuation in speed of movement near this location, but may even cause reversal of the driven side link, presenting a problem of uncertainty in movement. Thus, how to improve the smoothness of the parallelogram mechanism in practical use is a problem to be solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a floating gear driven parallelogram mechanism so as to improve the stability of the parallelogram mechanism in actual use.
The technical scheme adopted for solving the technical problems is as follows:
according to the invention, two gears are respectively fixedly connected to two side link rods of a parallelogram mechanism to serve as fixed shaft gears, an odd number of gears which are meshed with each other are arranged between the two fixed shaft gears to serve as floating gears, wherein the floating gears positioned in the middle are arranged on an elastic support, and radial pressure is formed on the rest floating gears and the fixed shaft gears; the rest of the floating gear wheels are all arranged on the sliding block, so that radial pressure generated by the floating gear positioned in the middle can be transmitted to the two fixed shaft gears directly or sequentially through the rest of the floating gears.
The elastic support consists of a central body, supporting heads positioned at two sides of the central body and beams connecting the central body and the supporting heads, a floating gear positioned in the middle is arranged in the central body, and the central body and the supporting heads at two sides are respectively connected through a beam; the radial force is generated by forcibly clamping the two support heads into the fixed runner, and bending deformation generated in the beam acts on the floating tooth in the middle through the central body to form the required pressure.
The floating gear driven parallelogram mechanism can be used for single-screen circumferential translation bit pattern volume display so as to reduce vibration and noise. The mechanism of the invention is an improvement of a parallelogram mechanism and can also be used for a parallel rod coupler, a lifting platform, a directional feeder and the like.
The invention has the beneficial effects that:
the mechanism adopts gears meshed with each other, and a transmission chain is added between two side links of the parallelogram mechanism and is parallel to the transmission chain through the connecting rods. This will overcome the problem of poor force transfer characteristics of the mechanism near the collinear position of the four bars when the parallelogram mechanism is used alone, thereby significantly reducing vibration of the mechanism. Meanwhile, the invention adopts the floating gear arranged on the elastic support and the sliding block, which not only can overcome the synchronization contradiction between two parallel transmission chains caused by manufacturing errors, but also can eliminate gear transmission backlash, thereby reducing the operation noise of the mechanism. Has good application prospect in the occasions needing to use the parallelogram mechanism, in particular to occasions with higher requirements on noise.
Drawings
FIG. 1 is a schematic diagram of the movement of a mechanism incorporating a floating gear;
FIG. 2 is a schematic diagram of the movement of a mechanism comprising three floating gears;
fig. 3 is a specific embodiment of a floating gear in the middle to achieve floating.
In the figure: 1. the device comprises a side link, 2, a connecting rod, 3, a side link, 4, a rack, 5, a fixed shaft gear, 6, a fixed shaft gear, 7, a floating gear, 8, a sliding block, 9, a sliding block, 10, an elastic support, 11, a floating gear, 12, a sliding block, 13, a sliding block, 14, a floating gear, 15, a central body, 16, a beam, 17 and a supporting head.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
The parallelogram mechanism is characterized in that two identical gears are respectively arranged on two hinges of the frame and used as fixed shaft gears, and the two fixed shaft gears are respectively fixedly connected with two side links; an odd number of gears meshed with each other are arranged between the two fixed shaft gears to serve as floating gears, wherein the floating gear positioned in the middle is arranged on an elastic support, and radial pressure is formed on the other floating gears and the fixed shaft gears, which are meshed with the floating gears at two sides; the other floating gears are all arranged on the sliding pair, and the sliding direction of the sliding pair is along the center distance direction between the rotary wheels, so that radial pressure generated by the floating gears positioned in the middle can be sequentially transmitted to the two fixed shaft gears through the other floating gears.
The rotating shafts of the fixed shaft gear and the floating gear are positioned at the central shaft of the fixed shaft gear and the floating gear.
As shown in fig. 1 and 2, the parallelogram mechanism is formed by hinging four rod pieces, wherein one rod piece is fixed as a frame 4, two rod pieces hinged with the frame 4 are a side link 1 and a side link 3 respectively, and the other ends of the side link 1 and the side link 3 are hinged with a connecting rod 2 respectively to form a parallelogram. The hinges at the two ends of the frame 4 are respectively and coaxially provided with a fixed shaft gear 5 and a fixed shaft gear 6, the fixed shaft gear 5 and the side link 1 are fixedly connected, namely, keep synchronous rotation, and the fixed shaft gear 6 and the side link 3 are fixedly connected, namely, keep synchronous rotation. The fixed shaft gear 5 drives the side link 1 to actively rotate around the corresponding hinge, and the fixed shaft gear 6 drives the side link 3 to passively rotate around the corresponding hinge.
When the number of floating gears is one: the mechanism comprising a floating gear is shown in fig. 1, a floating gear 7 is arranged between the fixed shaft gear 5 and the fixed shaft gear 6, the floating gear 7 is arranged on the frame 4 through an elastic floating structure, and the floating gear 7 is respectively meshed with the fixed shaft gear 5 and the fixed shaft gear 6.
FIG. 1 is a schematic diagram of the movement of a mechanism including a floating gear. Wherein the side link 1, the connecting rod 2, the side link 3 and the frame 4 form a parallelogram mechanism. The fixed shaft gear 5 is fixedly connected with the side link 1 into a whole; the fixed shaft gear 6 is fixedly connected with the side link 3 into a whole; the floating gear 7 is meshed with the fixed shaft gear 5 and the fixed shaft gear 6 at the same time, and is arranged on an elastic support 10 through a hinge, two ends of the elastic support are respectively arranged on a sliding block 8 and a sliding block 9 through hinges, and the sliding block 8, the sliding block 9 and the frame 4 respectively form a moving pair.
When the number of floating gears is three: as shown in figure 2, the mechanism comprising three floating gears is characterized in that three floating gears 7, 11 and 14 are arranged between a fixed shaft gear 5 and a fixed shaft gear 6, the floating gear 7 positioned in the middle is arranged on a frame 4 through an elastic floating structure, the other two floating gears 11 and 14 are respectively positioned at two sides of the floating gear 7 and meshed with the floating gear 7, and simultaneously are respectively meshed with the fixed shaft gear 5 and the fixed shaft gear 6, the two floating gears 11 and 14 are respectively arranged on sliding blocks 12 and 13 through hinges, and the sliding blocks 12 and 13 and the frame 4 form sliding pairs.
Figure 2 is a schematic diagram of the movement of a mechanism comprising three floating gears. Wherein the side link 1, the connecting rod 2, the side link 3 and the frame 4 form a parallelogram mechanism. The fixed shaft gear 5 is fixedly connected with the side link 1 into a whole; the fixed shaft gear 6 is fixedly connected with the side link 3 into a whole; the middle floating gear 7 is meshed with the floating gear 11 and the floating gear 14 at the same time and is arranged on an elastic support 10 through a hinge, two ends of the elastic support are respectively arranged on a slide block 8 and a slide block 9 through hinges, and the slide block 8, the slide block 9 and the frame 4 respectively form a moving pair; the floating gear 11 is meshed with the floating gear 7 and the fixed shaft gear 5 at the same time and is arranged on the sliding block 12 through a hinge, and the sliding block 12 and the frame 4 form a weighing pair; the floating gear 14 is meshed with the floating gear 7 and the fixed shaft gear 6 at the same time, and is mounted on the sliding block 14 through a hinge, and the sliding block 14 and the frame 4 form a moving pair.
The middle floating gear 7 is meshed with the floating gear 11 and the floating gear 14 at the same time, the floating gear 11 is meshed with the dead axle gear 5 and the floating gear 7 at the same time, and the floating gear is arranged on the sliding block 12 through a hinge, and the sliding block 12 and the frame 4 form a moving pair; the floating gear 14 is meshed with the fixed shaft gear 6 and the floating gear 7 at the same time, and is arranged in the sliding block 14 through a hinge, and the sliding block 14 and the frame 4 form a sliding pair.
The elastic floating structure comprises a frame 4, sliding blocks 8, sliding blocks 9 and an elastic support 10, wherein the elastic support 10 is arranged at the middle side of the frame 4, a floating gear 7 in the middle is hinged with the elastic support 10, the elastic support 10 is respectively hinged with the two sliding blocks 8 and 9, the two sliding blocks 8 and 9 respectively form a moving pair with the frame 4, and the sliding direction is parallel to the connecting line of the two fixed hinges on the frame 4.
The floating gears 11 and 14 are respectively hinged to the sliding blocks 12 and 13, the sliding blocks 12 and 13 and the frame 4 respectively form a moving pair, and the sliding direction enables radial pressure generated by the floating gear 7 to be respectively transmitted to the two fixed shaft gears 5 and 6 through the floating gears 11 and 14; the solution shown achieves this by mounting the slider between the links of two fixed hinges on the frame 4.
The elastic floating structure for realizing floating of the middle floating gear comprises an elastic support 10 and sliding grooves on the machine frames 4 at two sides, wherein the middle of the elastic support 10 is a central body 15, a round hole is formed in the central body 15, a rotating shaft of the floating gear 7 is arranged in the round hole of the central body 15, the central body 15 is respectively connected with two supporting heads 17 through respective beams 16, and the two supporting heads 17 are forcedly clamped into the sliding grooves on the machine frames 4 and can move along the sliding grooves to generate elastic deformation and form required pressure; the two support heads 17 act as slides and the runner acts as a guide rail, so that the support heads 17 can slide in the runners of the frame 4, forming two pairs of movements that simplify the slide 8 and the slide 9.
Fig. 3 is a specific embodiment of a floating gear in the middle to achieve floating. A floating gear 7 is arranged in a round hole of the central body 15, and the central body 15 is connected with a supporting head 17 through two side beams 16; the supporting heads 17 at the two ends are forcedly clamped into the sliding grooves on the frame 4 during installation, so as to generate elastic deformation and form required pressure; at the same time, the supporting head 17 can slide in the sliding groove of the frame 4, so that two sliding pairs which simplify the sliding blocks 8 and 9 are formed.
The working process principle conditions of the invention are as follows:
When the fixed shaft gear 5 is driven to rotate by external force, the side link 1 is driven to synchronously rotate, and then the driven fixed shaft gear 6 and the side link 3 are driven to correspondingly synchronously rotate. At this time, the middle floating gear 7 is always pressed against the direction close to the side of the frame 4 under the action of the elastic floating structure, so that radial pressure is formed on the floating gear meshed with the floating gear and transferred to the two fixed shaft gears through the floating gear, or radial pressure is directly formed on the two fixed shaft gears, and the floating gear drive is formed. The synchronous contradiction between the gear transmission chain and the connecting rod transmission chain caused by manufacturing errors is eliminated, the running stability of the mechanism is improved, and the running noise is reduced while the backlash in the gear transmission is eliminated and the vibration of the mechanism is reduced.
Claims (1)
1. A floating gear driven parallelogram mechanism, characterized by: the two ends of the frame are hinged with one ends of the two side links respectively through hinges, and the two ends of the connecting rod are hinged with the other ends of the two side links respectively, so that a parallelogram mechanism is formed; two identical gears are respectively arranged on two hinges at two ends of the frame and used as fixed shaft gears, and the two fixed shaft gears are respectively fixedly connected with two side links; an odd number of gears which are meshed with each other are arranged between the two fixed shaft gears to serve as floating gears, wherein floating gears at two ends are respectively meshed with the two fixed shaft gears, the floating gear positioned in the middle is arranged on an elastic support, and radial pressure is formed on the rest floating gears and the fixed shaft gears; the other floating gears are all arranged on the corresponding sliding blocks through hinges, and each sliding block and the rack form a sliding pair respectively, so that radial pressure generated by the floating gear positioned in the middle can be transmitted to the two fixed shaft gears directly or sequentially through the other floating gears;
The elastic support mainly comprises a central body, supporting heads positioned at two sides of the central body and beams connecting the central body and the supporting heads, wherein a floating gear positioned in the middle is arranged in the central body, and the central body and the supporting heads at two sides are respectively connected through one beam; the radial force is generated by forcibly clamping the two support heads into the fixed runner, and the bending deformation generated in the beam acts on the floating gear in the middle through the central body to form the required pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110820341.3A CN113606308B (en) | 2021-07-20 | 2021-07-20 | Floating gear driven parallelogram mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110820341.3A CN113606308B (en) | 2021-07-20 | 2021-07-20 | Floating gear driven parallelogram mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113606308A CN113606308A (en) | 2021-11-05 |
| CN113606308B true CN113606308B (en) | 2024-07-23 |
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ID=78338015
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110820341.3A Active CN113606308B (en) | 2021-07-20 | 2021-07-20 | Floating gear driven parallelogram mechanism |
Country Status (1)
| Country | Link |
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| CN (1) | CN113606308B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204639708U (en) * | 2014-12-20 | 2015-09-16 | 重庆联合机器制造有限公司 | Double hold-down mechanism |
| CN107366724A (en) * | 2017-09-13 | 2017-11-21 | 长沙学院 | A kind of gapless floating gear rack gearing |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2895610Y (en) * | 2006-04-07 | 2007-05-02 | 陈立军 | Wall-sawing machine saw-piece protective cover directing mechanism |
| TWI454625B (en) * | 2011-12-13 | 2014-10-01 | Ind Tech Res Inst | Apparatus of eliminating backlash for a planet gear set |
| CN103423410B (en) * | 2012-05-23 | 2015-10-14 | 中烟机械技术中心有限责任公司 | Realize the mechanism of track and Rigid-body Guidance |
| CN103423406B (en) * | 2012-05-23 | 2015-12-02 | 中烟机械技术中心有限责任公司 | Realize the device of track and Rigid-body Guidance |
| CN103089919B (en) * | 2013-01-28 | 2015-06-17 | 北京邮电大学 | Surface contact gear transmission mechanism |
| CN103398162A (en) * | 2013-08-16 | 2013-11-20 | 南京宁嘉机电有限公司 | Transmission device with adjustable center distance from input shaft to output shaft |
| KR101518413B1 (en) * | 2013-11-29 | 2015-05-08 | 에스앤티중공업 주식회사 | Gear Assembly for Back-lash Elimination and Main Spindle Driving Apparatus of Hobbing Machine Using Thereof |
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2021
- 2021-07-20 CN CN202110820341.3A patent/CN113606308B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204639708U (en) * | 2014-12-20 | 2015-09-16 | 重庆联合机器制造有限公司 | Double hold-down mechanism |
| CN107366724A (en) * | 2017-09-13 | 2017-11-21 | 长沙学院 | A kind of gapless floating gear rack gearing |
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| Publication number | Publication date |
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| CN113606308A (en) | 2021-11-05 |
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