42 Questions
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?
Determination of load case & constraints; Determination of acting surfaces; Based on the flow of Flux
What is the purpose of a star disc hub-shaft connection?
To translate an external axial actuating force into a much higher radial force.
Describe the construction of the ETP-HYLOC hydraulic joint.
It consists of a double-walled steel sleeve enclosing a conical moveable piston, and it requires a hydraulic pump for mounting and dismantling.
What is the function of an adjustable locknut in mechanical connections?
To provide a means of adjusting the preload or tension in the connection.
Explain the concept of pre-tensioning in connection mechanisms.
Pre-tensioning involves applying an initial load or force to the connection before it is subjected to the operating load.
What is the primary function of Spieth clamping sets (sleeves) in mechanical connections?
To provide pre-tensioning from either the shaft or the hub.
In what way does a conical piston hub-shaft connection (hydraulic) differ from other hydraulic connections?
It utilizes a double-walled steel sleeve enclosing a conical moveable piston for mounting and dismantling, using a hydraulic pump.
What are the characteristics of a ring type joint (clamping ring) in mechanical connections?
It utilizes a clamping ring to create a secure connection.
What distinguishes a star ring joint from other ring type joints?
It is designed with a star-shaped ring for the connection.
What are the advantages of spline shaft-spline plate connections?
Even power transmission, high transmittable power, good for alternating torque distribution, no eccentricity, easy assembly, and standardized.
What are the disadvantages of polygon shaft connections?
Production requiring special machines, high local surface pressure peaks, difficult FEM checking, and high cost.
What is the principle of force-locking joints based on?
Elastic clamping to prevent hub and shaft movement.
What are the types of force-locking joints mentioned in the text?
Adjustable hub-shaft, non-adjustable cylinder-cylinder, and direct touch.
What are the advantages of an interference fit?
Easy machining, self-centering, and smooth cross-sections.
What are the disadvantages of an interference fit?
Strict tolerances and difficult machining.
What does the term 'Hirth joint' connect?
Shafts, disks, rotors, wheels, and cranks with remarkable precision and maximum torque capacity.
What are the advantages of polygon shaft connections?
Self-centering construction, efficient for alternating load cases, and no eccentricity.
What does the deformation in an interference fit include?
Shaft (f1) and hub (f2) deformation, with a linear connection between bearing pressure and radial deformation.
What are the advantages of key connections engineering?
Covers the real pressure distribution, utilization of the length of the latch, and types of pins (dowel pin, taper pin, groove pin).
What does the calculation of key connections involve?
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).
What is the comparison with limit state checks in key connections?
Normal shearing stress (cs) and polar cross-section factor of the shaft (Kp).
What is the main concern in the case of angle misalignment in conical joints?
Reduced stress in the hub
What is the essential element in wedge joints?
A sloping part (wedge) pressed between hub and shaft with axial force
What are the advantages of frictional hub-shaft connections?
Backlash-free, reversing operation, simultaneous transmission of torque and axial force, compact solutions, and reduced costs
What is the specific focus of the text in relation to assembly processes and effects on surfaces?
During pressing-on, a smearing effect occurs, changing surface roughness and reducing transmittable power
How are the transmittable torque and force needed for axial movement calculated in interference fit?
Using minimum overlap
What is the assembly method for clamping joint?
Using a two-part hub with a grooved arm
What are the assembly situations for conical ring pairs?
Specific assembly situations for conical ring pairs
What are the critical aspects in wedge joints?
Transmittable torque and tension stress in the hub
What are the main calculations involved in interference fit (shaft-hub connection)?
Transmittable torque and force needed for axial movement using minimum overlap
What are the force play options for conical joints?
Pre-tensioned or torque-loaded
What is the focus of the text in relation to ring type joints with conical rings?
Further details on ring type joints with conical rings
What are the necessary checks for hub stress in interference fit (shaft-hub connection)?
Considering internal pressure and tangential stress from centrifugal force
What is the base function of packings, gaskets, and seals according to the text?
To control or stop leakage of fluids or solid dry products through mechanical clearances under pressure or vacuum.
What is the methodology mentioned in the text for packings, gaskets, and seals?
To block the unsealed routings by force, such as pressurizing the medium.
What is the purpose of packings, gaskets, and seals in mechanical systems?
To control or stop leakage of fluids or solid dry products through mechanical clearances under pressure or vacuum.
What is the base function of packings, gaskets, and seals according to the text?
To control or stop leakage of fluids or solid dry products through mechanical clearances when under pressure or vacuum.
What is the methodology mentioned in the text for packings, gaskets, and seals?
The methodology is to block the unsealed routings by force, such as pressurizing the medium.
What are the critical aspects in wedge joints according to the text?
The critical aspects in wedge joints include the essential element in wedge joints and the assembly method for clamping joint.
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.
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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