Mechanical Constants Determination Quiz
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Questions and Answers

What are the three types of effects based on which torque transmitting joints are classified?

Form-locking; Force-locking; Material-closing

Name three examples of key joints used in form-locking joints.

Square key; Woodruff key; Sledge runner key

What are the advantages of a key joint in torque transmission?

Simple structure; Simple assembly; Standardized; Trusted calculation methods

What are the steps involved in the calculation of torque transmitting elements?

<p>Determination of load case &amp; constraints; Determination of acting surfaces; Based on the flow of Flux</p> Signup and view all the answers

What is the purpose of a star disc hub-shaft connection?

<p>To translate an external axial actuating force into a much higher radial force.</p> Signup and view all the answers

Describe the construction of the ETP-HYLOC hydraulic joint.

<p>It consists of a double-walled steel sleeve enclosing a conical moveable piston, and it requires a hydraulic pump for mounting and dismantling.</p> Signup and view all the answers

What is the function of an adjustable locknut in mechanical connections?

<p>To provide a means of adjusting the preload or tension in the connection.</p> Signup and view all the answers

Explain the concept of pre-tensioning in connection mechanisms.

<p>Pre-tensioning involves applying an initial load or force to the connection before it is subjected to the operating load.</p> Signup and view all the answers

What is the primary function of Spieth clamping sets (sleeves) in mechanical connections?

<p>To provide pre-tensioning from either the shaft or the hub.</p> Signup and view all the answers

In what way does a conical piston hub-shaft connection (hydraulic) differ from other hydraulic connections?

<p>It utilizes a double-walled steel sleeve enclosing a conical moveable piston for mounting and dismantling, using a hydraulic pump.</p> Signup and view all the answers

What are the characteristics of a ring type joint (clamping ring) in mechanical connections?

<p>It utilizes a clamping ring to create a secure connection.</p> Signup and view all the answers

What distinguishes a star ring joint from other ring type joints?

<p>It is designed with a star-shaped ring for the connection.</p> Signup and view all the answers

What are the advantages of spline shaft-spline plate connections?

<p>Even power transmission, high transmittable power, good for alternating torque distribution, no eccentricity, easy assembly, and standardized.</p> Signup and view all the answers

What are the disadvantages of polygon shaft connections?

<p>Production requiring special machines, high local surface pressure peaks, difficult FEM checking, and high cost.</p> Signup and view all the answers

What is the principle of force-locking joints based on?

<p>Elastic clamping to prevent hub and shaft movement.</p> Signup and view all the answers

What are the types of force-locking joints mentioned in the text?

<p>Adjustable hub-shaft, non-adjustable cylinder-cylinder, and direct touch.</p> Signup and view all the answers

What are the advantages of an interference fit?

<p>Easy machining, self-centering, and smooth cross-sections.</p> Signup and view all the answers

What are the disadvantages of an interference fit?

<p>Strict tolerances and difficult machining.</p> Signup and view all the answers

What does the term 'Hirth joint' connect?

<p>Shafts, disks, rotors, wheels, and cranks with remarkable precision and maximum torque capacity.</p> Signup and view all the answers

What are the advantages of polygon shaft connections?

<p>Self-centering construction, efficient for alternating load cases, and no eccentricity.</p> Signup and view all the answers

What does the deformation in an interference fit include?

<p>Shaft (f1) and hub (f2) deformation, with a linear connection between bearing pressure and radial deformation.</p> Signup and view all the answers

What are the advantages of key connections engineering?

<p>Covers the real pressure distribution, utilization of the length of the latch, and types of pins (dowel pin, taper pin, groove pin).</p> Signup and view all the answers

What does the calculation of key connections involve?

<p>Determination of load case (F), acting surfaces (pressed surface: Ap, weakest cross-section: A∴), and load per unit surface (average surface pressure: p, average shearing stress: τ).</p> Signup and view all the answers

What is the comparison with limit state checks in key connections?

<p>Normal shearing stress (cs) and polar cross-section factor of the shaft (Kp).</p> Signup and view all the answers

What is the main concern in the case of angle misalignment in conical joints?

<p>Reduced stress in the hub</p> Signup and view all the answers

What is the essential element in wedge joints?

<p>A sloping part (wedge) pressed between hub and shaft with axial force</p> Signup and view all the answers

What are the advantages of frictional hub-shaft connections?

<p>Backlash-free, reversing operation, simultaneous transmission of torque and axial force, compact solutions, and reduced costs</p> Signup and view all the answers

What is the specific focus of the text in relation to assembly processes and effects on surfaces?

<p>During pressing-on, a smearing effect occurs, changing surface roughness and reducing transmittable power</p> Signup and view all the answers

How are the transmittable torque and force needed for axial movement calculated in interference fit?

<p>Using minimum overlap</p> Signup and view all the answers

What is the assembly method for clamping joint?

<p>Using a two-part hub with a grooved arm</p> Signup and view all the answers

What are the assembly situations for conical ring pairs?

<p>Specific assembly situations for conical ring pairs</p> Signup and view all the answers

What are the critical aspects in wedge joints?

<p>Transmittable torque and tension stress in the hub</p> Signup and view all the answers

What are the main calculations involved in interference fit (shaft-hub connection)?

<p>Transmittable torque and force needed for axial movement using minimum overlap</p> Signup and view all the answers

What are the force play options for conical joints?

<p>Pre-tensioned or torque-loaded</p> Signup and view all the answers

What is the focus of the text in relation to ring type joints with conical rings?

<p>Further details on ring type joints with conical rings</p> Signup and view all the answers

What are the necessary checks for hub stress in interference fit (shaft-hub connection)?

<p>Considering internal pressure and tangential stress from centrifugal force</p> Signup and view all the answers

What is the base function of packings, gaskets, and seals according to the text?

<p>To control or stop leakage of fluids or solid dry products through mechanical clearances under pressure or vacuum.</p> Signup and view all the answers

What is the methodology mentioned in the text for packings, gaskets, and seals?

<p>To block the unsealed routings by force, such as pressurizing the medium.</p> Signup and view all the answers

What is the purpose of packings, gaskets, and seals in mechanical systems?

<p>To control or stop leakage of fluids or solid dry products through mechanical clearances under pressure or vacuum.</p> Signup and view all the answers

What is the base function of packings, gaskets, and seals according to the text?

<p>To control or stop leakage of fluids or solid dry products through mechanical clearances when under pressure or vacuum.</p> Signup and view all the answers

What is the methodology mentioned in the text for packings, gaskets, and seals?

<p>The methodology is to block the unsealed routings by force, such as pressurizing the medium.</p> Signup and view all the answers

What are the critical aspects in wedge joints according to the text?

<p>The critical aspects in wedge joints include the essential element in wedge joints and the assembly method for clamping joint.</p> Signup and view all the answers

Study Notes

  • The text discusses various types of gearbox components and their assembly methods, specifically focusing on interference fits and conical joints.
  • Interference fit (shaft-hub connection):
    • Minimum overlap results in smallest bearing pressure and highest bearing pressure at maximum overlap.
    • Transmittable torque and force needed for axial movement are calculated using minimum overlap.
    • Hub stress checks are necessary, considering internal pressure and tangential stress from centrifugal force.
  • Assembly processes and effects on surfaces:
    • During pressing-on, a smearing effect occurs, changing surface roughness and reducing transmittable power.
  • Clamping joint:
    • Two-part hub with a grooved arm is used.
  • Conical joints:
    • Hub with a conical bore is pressed onto a conical shaft end.
    • Force play of the connection can be pre-tensioned or torque-loaded.
    • Reduced stress in the hub is a main concern, especially in the case of angle misalignment.
  • Wedge joints:
    • Essential element is a sloping part (wedge) pressed between hub and shaft with axial force.
    • Transmittable torque and tension stress in the hub are critical aspects.
  • Frictional hub-shaft connections:
    • Standard machine elements used for shaft-hub connections.
    • Advantages include backlash-free, reversing operation, simultaneous transmission of torque and axial force, compact solutions, and reduced costs.
  • Conical ring pairs (built-in situations):
    • Specific assembly situations for conical ring pairs.
  • Ring type joints (conical ring force play):
    • Vectors of the first ring pair and force play of the entire assembly are discussed.
  • Ring type joints (conical ring):
    • Further details on ring type joints with conical rings.

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Gaskets & Sealing PDF
Torque Transmitting Joints PDF

Description

Test your knowledge on the determination of mechanical constants using thick-wall tubes theory, Young's modulus, and Poisson's ratio. The quiz covers equations for calculating K1 and K2 and their relationship with material properties.

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