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Crank link rod mechanism with variable length link rod

A crank-link mechanism and connecting rod technology, which is applied in the direction of mechanical equipment, belts/chains/gears, transmission devices, etc., can solve problems such as no solutions, no attention to it, and pressure effects

Inactive Publication Date: 2009-05-13
朱瑞林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that the oscillating motion of the slider driven by the connecting rod in the ordinary crank-link mechanism is not a pure sine or cosine motion. The distance between the blocks, so the distance between the inner end faces of the two pistons driven by the slider cannot be kept constant during the operation of the mechanism
This is an unfavorable factor in some cases, such as affecting the pressure of the working medium between the inner faces of the two pistons.
However, neither prior art nor theory has attracted attention to this, and no solution has been proposed.

Method used

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  • Crank link rod mechanism with variable length link rod
  • Crank link rod mechanism with variable length link rod
  • Crank link rod mechanism with variable length link rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, the device 7 is sealed and fixedly connected with the piston guide tube 5 through flanges, bolts, and gasket assemblies, the piston 4 is sealed and movable with the piston guide tube 5 through the sealing element, and the piston rod of the piston 4 is in contact with the contact piece 12 Vertical fixed connection, the piston rod is covered with a spring 13 (compression spring), one end of the spring 13 bears on the outer end of the piston guide cylinder 5, and the other end bears on the contact piece 12, so as to ensure that the contact piece 12 is in tangential contact with the push wheel 10 all the time, and the push wheel The radius of 10 is equivalent to the connecting rod length of the common crank linkage mechanism, which is greater than the length of the crank 1, and the geometric center of the push wheel 10 is fixedly connected with the end of the crank 1. The crank 1 is driven to rotate by a power device (such as a motor), and the crank 1 drives th...

Embodiment 2

[0036]Embodiment 2, adjust the parameters such as the size and rotational speed of the crank 1 and the connecting rod 2 so that the pistons can obtain the required movement law or the distance between the inner end surfaces of the two pistons can be changed according to the required law. From the motion analysis below, it can be seen that different lengths of the crank 1 and connecting rod 2 form different motion laws, and designing different lengths of the crank 1 and connecting rod 2 according to actual needs can make the piston 4 obtain different motion laws. In addition, from the following formula (10) and Figure 16 It can be seen that the smaller η is (η=λ / λ'=(l 1 / l 2 ) / (l 1 ' / l 2 ')=(l 1 l 2 ') / (l 1 'l 2 )), the smaller the change δ of the distance between the inner faces of the two pistons 4 is. Accordingly, if the push wheel 10 is not used and the δ is desired to be small, a smaller η design can be adopted. where l 1 , l 1 ' are the lengths of the cranks 1...

Embodiment 3

[0037] Example 3, any with l 1 is the length of crank 1, with l 2 2 + l 1 2 sin 2 β = l 2 2 + l 1 2 sin 2 ωt The crank-and-rod mechanism formed by the length of the connecting rod 2 can implement the crank-and-rod mechanism with variable length of the connecting rod, wherein l 1 is the length of crank 1, l 2 Be the length of fixed-length connecting rod 2 of ordinary crank-link mechanism, equal to the radius of push wheel 10 at this moment, β is the position angle of certain instant crank 1, ω is the angular velocity of crank 1, t is time.

[0038] The motion analysis will be car...

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Abstract

In the invention, a variable-length virtual connecting-rod is used instead of a common slot-and-crank mechanism. A variable-length connecting-rod formed by a driving wheel makes the member driven by the driving wheel produce a pure sinusoidal or cosinusoidal motion for making the equipment operation space or the medium in it produce a pure sinusoidal or cosinusoidal oscillation or maintaining an invariant equipment operation space to guarantee the medium pressure in the space not to be influenced. Regulating the length of the crank and / or the connecting-rod can make the equipment operation space change according to the fixed law.

Description

technical field [0001] The invention relates to a crank connecting rod mechanism with variable connecting rod length, which belongs to the technical fields of mechanical principles and mechanisms. Background technique [0002] The crank-link mechanism can be used in many machines or instruments. The study found that the oscillating motion of the slider driven by the connecting rod in the ordinary crank-link mechanism is not a pure sine or cosine motion. The distance between the blocks, thus the distance between the inner end faces of the two pistons driven by the slider cannot be kept constant during the operation of the mechanism. This is an unfavorable factor in some cases, such as affecting the pressure of the working medium between the inner end faces of the two pistons. However, neither the prior art nor the theory has attracted attention to this, and no solution has been proposed. In view of this, the present invention provides a crank-rod mechanism with variable co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H21/18
Inventor 朱瑞林
Owner 朱瑞林
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