Leaf springs are commonly used in vehicle suspensions. The rod is supported by an elastic beam flexure hinge, both being originally horizontal. Flexure bearings are often part of compliant mechanisms. In order to permit a large deflection, three lamina emergent torsional flexure hinges are reconfigured to create a new triple lettype flexure hinge tlet in this paper. This paper designs and analyzes a new kind of flexure hinge obtained by using a topology optimization approach, namely, a quasivshaped flexure hinge qvfh. Standard export powerpoint slide the modeling effort so far, to the best of the authors knowledge, has regarded the torsional flexure hinges as constant rectangular crosssection members, an example being the paper by zhang et al. A design method for flexurebased com pliant mechanisms.
Use features like bookmarks, note taking and highlighting while reading compliant mechanisms. The flexure hinge is a special mechanical component that produces the limited angular motion utilizing the microelastic deformation of the material, which possesses the advantages of no friction, zero backlash, high sensitivity, and so on. A design method for flexurebased compliant mechanisms on the basis of stiffness and stress characteristics presentata da. Research on zerostiffness flexure hinge zsfh based on spring fourbar linkage4bsl author links open overlay panel tian liu a shusheng bi a yanbin yao b zhaohui dong c qizi yang a lang liu d. The obtained optimal hinge designs are validated with a finite element model and show good agreement. Dec 24, 1985 the double flexure hinge 35, 36 formed by recesses 30, 31 and 32 is identical to the double flexure hinge 25, 26 formed by recesses 20, 21 and 22 in all respects except that the common recess 20 for double hinge 25, 26 is formed through edge 24 of arm 16, whereas the common recess 30 of double hinge 35, 36 is formed through opposite edge 23. Ruiling duan, yuhe li, qingxiang li, and juan gong design and analysis on microworktable using novel symmetric flexure hinge based on microassembly, proc. Design and performance analysis of a tlettype flexure hinge. Leaf springs are an example of a flexure system with one compliant degree of freedom. Analysis and design of symmetric notch flexure hinges ning xu.
Flexure hinge has been widely used in high precision micropositioning mechanism and the most common type is right circular flexure hinge. Thus, the validity of the analytic computation formula is verified, realize accurate design and computation for such flexure hinges is realized, and. Download it once and read it on your kindle device, pc, phones or tablets. A flexure hinge assembly comprising a pair of fixed telescopes inner and outer tubular members separated into at least one driving portion, at least one gimbal portion and at least one driven portion and a plurality of flexure blades all formed by a plurality of slots and apertures through the walls of each tubular member. Research on zerostiffness flexure hinge zsfh based on.
Stiffnessoriented design of a flexure hingebased parallel. Oct 08, 2001 in this paper, we propose backlashfree and frictionfree manipulators using flexure hinges and direct drive actuators. Although various flexure hinges with different configurations have been successively proposed, they are often designed based on designers experiences and inspirations. Jul 25, 2002 the design equations are the result of an exact deduction and are concise in their expressions, so it is more convenient to use them in calculating and analyzing flexure hinges and flexure hinge mechanisms.
Keywords flexure hinge, stiffness, rotational precision, hinge index. Preferred for their simplicity, as they can be included as a feature in a single piece of material as in a tic tac boxs lid. Flexure bearings serve much of the same function as conventional bearings or hinges in. We print the stage such that the hinge axes all lie in the horizontal plane. Pdf download for analysis and design of symmetric notch flexure. From this study, the following parameters were established as design guide for a circular micro flexure hinge. A onepiece 3d printed flexure translation stage for open. Design of flexure hinges provides practical answers and directions to the needs of efficiently designing, analyzing, and optimizing devices that include flexure hinges.
Flexure hinges and torsion suspensions are devices which connect or transmit load between two components while. Experimental and finite element analyses suggest that a nonsymmetric elliptical flexure hinge is the most suitable type for use in the soft monolithic robotic finger. Design of flexure hinges kindle edition by lobontiu, nicolae. It contains readytouse plots and simple equations describing several flexure types for the professional that needs quick solutions to current applications. A flexure hinge is a major component in designing compliant mechanisms that offers unique possibilities in a wide range of application fields in which high positioning accuracy is required. Principles of microscale flexure hinge design for enhanced. Jan 23, 2010 in this paper, a new twodimensional, compliant, monolithic piezoactuated microgripper using flexure hinges is reported. Pdf this article presents the analytic models of four types of flexure hinges elliptic, circular, parabolic, and hyperbolic flexure hinges.
Abstract this paper presents the analytic flexure hinge, involved in design optimization for a compliant mechanism, as a one. Modeling and design of flexure hingebased compliant mechanisms. An improved flexure hinge permits both angular pivoting and longitudinal expansion and contraction and is made of a body member of solid material which is normally not flexible or expandable. The transverse loads cause internal shear forces and bending moments in the beams as shown in figure 1 below. In many mems applications, however, it is rather difficult to obtain this geometric configuration by means of regular etching techniques because. Us4143451a method of manufacturing a flexure hinge. Each of these hinge types is described by a parameterized geometric model. The operation of flexure hingebased parallel manipulators primarily relies on their stiffness or compliance characteristics, which are considered by means of an analytical method, the finite element method fem or an experimental method. Torsional stiffness of several variable rectangular cross. Design of flexure hinges provides practical answers to the present and future needs of efficient design, analysis, and optimization of devices that incorporate flexure hinges. Large stroke performance optimization of spatial flexure.
Us4143451a method of manufacturing a flexure hinge assembly. Different from conventional hinge, monolithic flexure hinge has the advantages of no friction, no. Linear flexure bearings consist of vertically oriented flexure elements held into place on the top and bottom by rectangular mounting blocks. This paper presents a method for large deformation analysis for flexure hinged displacement amplifier by minimum potential energy. A cantilever flexure is a single leaf or notched flexure rigidly clamped between the two sections of a mechanism with one fixed and one free to rotate. Multiobjective optimization of flexure hinge mechanism.
A first recess is defined partway through the body member at one longitudinally extending edge opposite second and third recesses defined through the opposite longitudinallyextending edge of the body. Principles of microscale flexure hinge design for enhanced endurance. The slit mechanism has been built and the deflection load performance experimentally validated. Design and analysis of a highaccuracy flexure hinge. Pdf analysis and design of symmetric notch flexure hinges. The tlet consists of flexure hinges in a series coupled with others in parallel configuration. Simulation results showed that stiffness and accuracy of the modified doubleparallelogram flexure hinge mechanism are higher than general doubleparallelogram flexure hinge mechanism, and output displacement linearity is better than singleparallelogram flexure hinge mechanism. The proposed joint is capable of generating a large. The scanning mechanism incorporating the slits has been demonstrated in the laboratory. Optimal design of a flexurehinge precision stage with a. The operation of flexure hinge based parallel manipulators primarily relies on their stiffness or compliance characteristics, which are considered by means of an analytical method, the finite element method fem or an experimental method. Riverhawk flexural pivot bearing document downloads flex pivots. Calculation on rotation stiffness of asymmetrical right. Riverhawks linear flexure bearings are used for shockvibration dampers and cam followers with linkages in various industries.
Multiobjective design optimization of flexure hinges for. A three degrees of freedom dof parallel robot x, y, z that is a transposition in a flexible structure of the delta robot kinematics is presented. On mechanical properties of planar flexure hinges of. Theoretical calculation and finite element software ansys are both used to acquire the optimum dimensional parameters of the mechanism. The flexure hinges are the most vulnerable parts in a flexurebased mechanism due to their smaller dimensions and stress concentration characteristics, therefore evaluating the maximum stresses generated in them is crucial for assessing the workspace and the fatigue life of the mechanism. Firstly, asymmetrical right circular flexure hinge is presented and the structure factor is introduced in the paper according to the size of the cutting arc radius of both sides of right circular flexure hinge. Relations between design parameters and magnification ratio, and the optimal values for the parameters to achieve a longer stage displacement are presented. Topological and shape optimization of flexure hinges for. The flexure hinge of claim 15 wherein the at least one recess has an outline in a direction y and direction z plane in which. Department of precision instruments and mechanology, tsinghua university, beijing 84, china. Download pdf the art of flexure mechanism design free. Design and analysis on microworktable using novel symmetric.
Flexure bearings serve much of the same function as conventional bearings or hinges in applications which require angular compliance. Modelbased design of flexure hinges for rectilinear guiding with. With the width w of a circular flexure from 300 to 500. The simplest form of flexural hinge is the cantilever flexure. A flexible multibody modeling approach is used for efficient modeling.
In this contribution, the potential of improving the motion precision as well as the motion range by specific design of the flexure hinge dimensions and in particular. Geometrical dimensions include the hinge length, the hinge thickness, the side height, the rigid beam width, the total height. The closedform compliance equations of the flexure hinge were derived to design the powerfunctionshaped flexure hinges and could achieve higher motion accuracy than the commonly used circular flexure hinge and vshaped flexure hinge. The geometrical parameters of the constant rectangular cross section flexure hinge are shown in figure 1 with its coordinate system whose origin is located at the free end of the hinge, and axis and axis are in the longitudinal and height directions, respectively. Large deformation analysis for flexure hinged displacement. At present, there is much research in the design of flexible hinges, such as the proposed cross reed flexure hinge, the generalized threecross reed flexure hinge, the inner and outer ring flexure hinge, and so on. Analysis and design of symmetric notch flexure hinges. Design of flexure hinges in an hdrive precision stage with a large span. Flexibility calculation of likeu type flexure hinge bentham open.
Click download or read online button to the art of flexure mechanism design book pdf for. However, flexures require no lubrication and exhibit very low or no friction. Firstly, a displacement amplifying mechanism with a cornerfilleted flexure hinge hereafter referred to as a flexible hinge is proposed, and the type of piezoelectric actuator is determined. Jan 20, 2014 the flexure hinges are the most vulnerable parts in a flexure based mechanism due to their smaller dimensions and stress concentration characteristics, therefore evaluating the maximum stresses generated in them is crucial for assessing the workspace and the fatigue life of the mechanism. Rules of thumb for manufacturability versus hinge functionality. For zero stiffness flexure hinges, matching the appropriate negative stiffness module is the key. In this paper, we propose backlashfree and frictionfree manipulators using flexure hinges and direct drive actuators. A precision stage employing a lever mechanism and flexure hinges is analyzed theoretically, with bending in the lever considered. A jpe precision point sheet about the formulas of flexure hinge design and flexure hinge stiffness to benefit your play free and frictionless system design.
The flexure hinged displacement amplifier is widely used in micro electromechanical system, micro manipulation, gyroscopes. Analysis and design of symmetric notch flexure hinges ning. A universal analytical method is adopted for flexure hinges. Fused deposition modeling, a lowcost 3d printing technique, was used to fabricate the flexure hinges and the soft monolithic robotic fingers. Flexure hinge the united states of america as represented. A novel piezostackdriven jetting dispenser with corner. Several objective functions simultaneously arise in optimization to enhance the magnification factor in improving the mechanisms performance. A flexure hinge is a flexible connector that can provide a limited rotational motion between two rigid parts by means of material deformation. The fatigue properties of wood in flexure pdf free download. A flexure bearing is a category of flexure which is engineered to be compliant in one or more angular degrees of freedom.
Generalized equations for estimating stress concentration. Tamarack habilitation technologies tamarack flexure joint. This arrangement is aimed to enhance the displacement of the joint. Large stroke performance optimization of spatial flexure hinges.
Design of flexure hinges in an hdrive precision stage with a large. Flexure blades are formed by pairs of adjacent apertures with the slots. Riverhawk flexural pivot bearing document downloads flex. The microgripper is designed, and a comparison study on stress and displacement is done by varying the hinge parameters such as the hinge radius, web thickness, position of flexure hinge, and radius of curvature of hinges. Dec 07, 2017 the flexure hinge of claim 15 wherein the at least one recess has an outline in a direction y and direction z plane in which. The double flexure hinge 35, 36 formed by recesses 30, 31 and 32 is identical to the double flexure hinge 25, 26 formed by recesses 20, 21 and 22 in all respects except that the common recess 20 for double hinge 25, 26 is formed through edge 24 of arm 16, whereas the common recess 30 of double hinge 35, 36 is formed through opposite edge 23. Click download or read online button to the art of flexure mechanism design book pdf for free now. Parametric study of circular micro flexure hinge design. Download the art of flexure mechanism design ebook pdf or read online books in pdf, epub, and mobi format. Lever mechanisms are usually used to enlarge output displacements in precision stages. Pdf modeling and design of flexure hingebased compliant. A design method for flexurebased com pliant mechanisms on.
864 1124 1221 1258 1251 1492 285 451 68 1173 838 1438 1288 1495 818 235 1475 120 1158 1216 1400 626 736 585 1554 1167 332 498 365 115 241 486 1396 1474