阅读说明：本技术 一种浮动齿轮驱动的平行四边形机构 (Parallelogram mechanism driven by floating gear ) 是由 李立新 于 2021-07-20 设计创作，主要内容包括：本发明公开了一种浮动齿轮驱动的平行四边形机构。在平行四边形机构的两个连架上分别固连有两个齿轮作为定轴齿轮,在两个定轴齿轮之间安装有相互啮合的奇数个齿轮作为浮动齿轮,其中位于正中间的浮动齿轮安装在一个弹性支架上,对其余的浮动齿轮和定轴齿轮形成径向压力；其余的浮动齿轮均安装在滑块上,使得位于正中间的浮动齿轮产生的径向压力能够直接或经由其余的浮动齿轮依次传递到两个定轴齿轮上。本发明机构克服了单独使用平行四边形机构时在四杆共线位置附近机构传力特性太差的问题,从而显著减少机构振动；克服了制造误差产生的在两条并行传动链之间的同步性矛盾,并可消除齿轮传动侧隙,减少运行噪声。(The invention discloses a parallelogram mechanism driven by a floating gear. Two gears are fixedly connected to two connecting frames of the parallelogram mechanism respectively to serve as fixed shaft gears, odd gears which are meshed with each other are installed between the two fixed shaft gears to serve as floating gears, the floating gear located in the middle of the two fixed shaft gears is installed on an elastic support, and radial pressure is formed on the rest floating gears and the fixed shaft gears; the rest of the floating gears are all installed on the sliding blocks, 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 mechanism of the invention overcomes 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 used independently, thereby obviously reducing the vibration of the mechanism; the method overcomes the contradiction of synchronism between two parallel transmission chains caused by manufacturing errors, can eliminate gear transmission backlash and reduce operation noise.)

1. A parallelogram mechanism driven by floating gears is characterized in that: two gears are fixedly connected to two frame connecting rods of the parallelogram mechanism respectively to serve as fixed shaft gears, odd gears which are meshed with each other are installed between the two fixed shaft gears to serve as floating gears, the floating gear located in the middle of the two fixed shaft gears is installed 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 installed on the sliding blocks, so that radial pressure generated by the floating gear wheel positioned in the middle can be transmitted to the two fixed shaft gears directly or sequentially through the rest of the floating gear wheels.

2. A floating gear driven parallelogram mechanism as claimed in claim 1, wherein: the elastic support mainly comprises a central body, support heads positioned on two sides of the central body and a beam connecting the central body and the support heads, wherein a floating gear positioned in the middle is arranged in the central body, and the central body and the support heads on the two sides are connected through a beam respectively; the method for generating radial force is to force the two supporting heads to be clamped into the fixed sliding grooves, 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.

Technical Field

The invention relates to a parallelogram mechanism and a structure, in particular to a parallelogram mechanism which is driven by a floating gear and can move stably.

Background

The parallelogram mechanism is used, and the most common method is that one side link is used as a driving part, and a connecting rod and the other side link are used as driven parts. In theory, the rotating speeds of the two side link rods of the mechanism are consistent, and the connecting rods move in parallel; in practice, however, due to manufacturing tolerances and the presence of gaps in the hinges, the rotational speeds of the two side links are not uniform, and the movements of the links are not parallel. Since the transmission angle of the mechanism is zero in the four-bar collinear position, the force transfer characteristics are poor near this position: this not only results in a great fluctuation in the speed of movement of the mechanism near this position, but may even cause a reversal of the driven side link, with the problem of uncertainty in movement. Therefore, how to improve the stability of the parallelogram mechanism in practical use is a problem to be solved.

Disclosure of Invention

In order to solve the problems in the background art, the invention aims to provide a parallelogram mechanism driven by a floating gear, so as to improve the stability of the parallelogram mechanism in practical use.

The technical scheme adopted by the invention for solving the technical problems is as follows:

two gears are fixedly connected to two frame connecting rods of a parallelogram mechanism respectively to serve as fixed shaft gears, odd gears which are meshed with each other are installed between the two fixed shaft gears to serve as floating gears, the floating gear located in the middle of the two fixed shaft gears is installed 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 installed on the sliding blocks, so that radial pressure generated by the floating gear wheel positioned in the middle can be transmitted to the two fixed shaft gears directly or sequentially through the rest of the floating gear wheels.

The elastic support consists of a central body, support heads positioned at two sides of the central body and a beam connecting the central body and the support heads, a floating gear positioned in the middle is arranged in the central body, and the central body and the support heads at two sides are connected through a beam respectively; the method for generating radial force is to force the two supporting heads to be clamped into the fixed sliding grooves, and the bending deformation generated in the beams acts on the floating teeth in the middle through the central body to form the required pressure.

The parallelogram mechanism driven by the floating gear can be used for single-screen circumferential translation bitmap type volume display 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 coupling, a lifting platform, a directional feeder and the like.

The invention has the beneficial effects that:

the mechanism of the invention adopts gears which are 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 passing through the connecting rod. This will overcome the problem of poor force transfer characteristics of the mechanism near the four-bar collinear position when using a parallelogram mechanism alone, thereby significantly reducing the vibration of the mechanism. Meanwhile, the invention adopts the floating gear arranged on the elastic bracket and the sliding block, which not only can overcome the contradiction of synchronism between two parallel transmission chains generated by manufacturing errors, but also can eliminate the gear transmission backlash, thereby reducing the operation noise of the mechanism. The method has good application prospect in occasions where the parallelogram mechanism is needed, especially in occasions where the requirement on noise is high.

Drawings

FIG. 1 is a diagrammatic view of the mechanism movement including a floating gear;

FIG. 2 is a diagrammatic view of the mechanism movement containing three floating gears;

fig. 3 is a specific embodiment of floating of the floating gear in the middle.

In the figure: 1. side link, 2, connecting rod, 3, side link, 4, frame, 5, dead axle gear, 6, dead axle gear, 7, floating gear, 8, slider, 9, slider, 10, elastic support, 11, floating gear, 12, slider, 13, slider, 14, floating gear, 15, central body, 16, beam, 17, support head.

Detailed Description

The invention is further described with reference to the accompanying drawings and the detailed description.

The two same gears are respectively installed on two hinges of the frame and are used as fixed shaft gears which are respectively fixedly connected with the two connecting frame rods; odd gears which are meshed with each other are arranged between the two fixed shaft gears and are used 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 rest floating gears are all installed on the sliding pair, and the sliding direction of the sliding pair is along the center distance direction between the rotary wheels, so that the radial pressure generated by the floating gear positioned in the middle can be sequentially transmitted to the two fixed-axis gears through the rest floating gears.

The rotating shafts of the fixed gear and the floating gear are both positioned at the central shaft of the fixed gear and the floating gear.

As shown in fig. 1 and 2, the parallelogram mechanism is formed by four hinged rods, one of which is fixed as a frame 4, two rods hinged to 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 to a connecting rod 2 to form a parallelogram. The fixed shaft gear 5 and the fixed shaft gear 6 are respectively and coaxially arranged at the hinges at two ends of the rack 4, the fixed shaft gear 5 and the side link 1 are fixedly connected to keep synchronous rotation, and the fixed shaft gear 6 and the side link 3 are fixedly connected to keep synchronous rotation. The fixed shaft gear 5 drives the side link 1 to actively rotate around the hinge corresponding to the fixed shaft gear, and the fixed shaft gear 6 drives the side link 3 to passively rotate around the hinge corresponding to the fixed shaft gear.

When the number of the floating gears is one: as shown in figure 1, a floating gear 7 is arranged between a fixed shaft gear 5 and a fixed shaft gear 6, the floating gear 7 is arranged on a 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.

Figure 1 is a diagrammatic view of the mechanism movement 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 simultaneously and is mounted on an elastic support 10 through hinges, two ends of the elastic support are mounted on a sliding block 8 and a sliding block 9 through hinges respectively, and the sliding block 8, the sliding block 9 and the rack 4 form a moving pair respectively.

When the number of the 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 installed on a machine 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, and are simultaneously meshed with the fixed shaft gear 5 and the fixed shaft gear 6 respectively, the two floating gears 11 and 14 are installed on sliding blocks 12 and 13 through hinges respectively, and the sliding blocks 12 and 13 and the machine frame 4 form a sliding pair.

Figure 2 is a diagrammatic view of the mechanism movement containing 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 floating gear 7 in the middle is meshed with the floating gear 11 and the floating gear 14 at the same time and is arranged on an elastic bracket 10 through a hinge, two ends of the elastic bracket 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 machine frame 4 respectively form a moving pair; the floating gear 11 is meshed with the floating gear 7 and the fixed shaft gear 5 simultaneously and is arranged on a sliding block 12 through a hinge, and the sliding block 12 and the machine frame 4 form a balance pair; the floating gear 14 is meshed with the floating gear 7 and the fixed shaft gear 6 simultaneously, and is installed on the sliding block 14 through a hinge, and the sliding block 14 and the machine frame 4 form a moving pair.

The floating gear 7 in the middle is meshed with the floating gear 11 and the floating gear 14 at the same time, the floating gear 11 is meshed with the fixed shaft gear 5 and the floating gear 7 at the same time and is arranged on the sliding block 12 through a hinge, and the sliding block 12 and the machine frame 4 form a moving pair; the floating gear 14 is meshed with the fixed shaft gear 6 and the floating gear 7 simultaneously, and is installed in the sliding block 14 through a hinge, and the sliding block 14 and the machine frame 4 form a sliding pair.

The elastic floating structure comprises a frame 4, a sliding block 8, a sliding block 9 and an elastic support 10, the elastic floating structure is arranged on the middle side of the frame 4, a floating gear 7 in the middle is hinged to the elastic support 10, the elastic support 10 is hinged to the two sliding blocks 8 and 9 respectively, the two sliding blocks 8 and 9 form a moving pair with the frame 4 respectively, and the sliding direction of the moving pair 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 respectively form a moving pair with the frame 4, and the sliding direction enables the radial pressure generated by the floating gear 7 to be transmitted to the two fixed shaft gears 5 and 6 through the floating gears 11 and 14 respectively; the solution shown achieves this by mounting the slider between the two fixed hinge connections on the frame 4.

An elastic floating structure for realizing floating of a floating gear in the middle comprises an elastic support 10 and sliding grooves which are positioned on two sides of a rack 4, wherein a central body 15 is arranged in the middle of the elastic support 10, a round hole is formed in the central body, 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 forcibly clamped into the sliding grooves in the rack 4 and can move along the sliding grooves to generate elastic deformation and form required pressure; the two supporting heads 17 are used as sliding blocks, and the sliding grooves are used as guide rails, so that the supporting heads 17 can slide in the sliding grooves of the frame 4, and two sliding pairs which simplify the sliding blocks 8 and 9 are formed.

Fig. 3 is a specific embodiment of floating of the floating gear in the middle. The central body 15 is provided with a floating gear 7 in a circular hole, and the central body 15 is connected with a support head 17 through two side beams 16; when in installation, the supporting heads 17 at the two ends are forcibly clamped into the sliding grooves on the rack 4 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, and two sliding pairs which simplify the sliding blocks 8 and 9 are formed.

The working process principle condition of the invention is as follows:

when the dead axle gear 5 is driven by external force to rotate, the side link 1 is driven to synchronously rotate, and then the driven dead axle gear 6 and the side link 3 are driven to correspondingly synchronously rotate. At this time, the floating gear 7 in the middle is always pressed in the direction close to the frame 4 under the action of the elastic floating structure, and further radial pressure is formed on the floating gear meshed with the floating gear and transmitted to the two fixed-axis gears through the floating gear, or the radial pressure is directly formed on the two fixed-axis gears, so that floating gear driving is formed. The backlash in the gear transmission is eliminated, the vibration of the mechanism is reduced, and meanwhile, the synchronization contradiction between the gear transmission chain and the connecting rod transmission chain caused by manufacturing errors is eliminated, the operation stability of the mechanism is improved, and the operation noise is reduced.