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Crank link rod mechanism with variable length link rod

A technology of crank connecting rod mechanism and connecting rod, which is applied in mechanical equipment, belt/chain/gear, transmission, etc., can solve the problems of pressure influence, cannot be kept constant, and no solutions are proposed.

Inactive Publication Date: 2007-01-03
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] In Embodiment 1, the device 7 is sealed and fixedly connected with the piston guide cylinder 5 through flanges, bolts, and gasket components. The piston 4 is in a sealed and movable fit with the piston guide cylinder 5 through a sealing element. The piston rod of the piston 4 and the contact piece 12 Vertically fixed connection, the piston rod is sheathed with a spring 13 (compression spring). One end of the spring 13 is against the outer end of the piston guide cylinder 5, and the other end is against the contact 12 to ensure that the contact 12 is always in tangential contact with the pushing wheel 10. The pushing wheel The radius of 10 is equivalent to the connecting rod length of an ordinary crank connecting rod mechanism, and is greater than the length of the crank 1. The geometric center of the pushing 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), the crank 1 drives the push wheel 10 to ...

Embodiment 2

[0036]In the second embodiment, the parameters such as the size and speed of the crank 1 and the connecting rod 2 are adjusted so that the piston obtains the required motion law or the distance between the inner end faces of the two pistons is changed according to the required law. From the following motion analysis, it can be seen that different lengths of crank 1 and connecting rod 2 form different motion laws. Designing different lengths of crank 1 and connecting rod 2 according to actual needs can make 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 between the inner end faces of the two pistons 4 is. Accordingly, if the push wheel 10 is not used and δ is desired to be small, a smaller η design solution can be adopted. Where l 1 , L 1 ′Respectively the length of crank 1 of the left and right mechanism, l 2 ...

Embodiment 3

[0037] Example 3. Anything 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-connecting rod mechanism composed of the length of connecting rod 2 can implement the crank-connecting rod mechanism with variable connecting rod length. 1 Is the length of crank 1, l 2 It is the length of the fixed-length connecting rod 2 of the ordinary crank connecting rod mechanism, which is equal to the radius of the pushing wheel 10, β is the position angle of the crank 1 at a certain instant, ω is the angular velocity of the crank 1, and t is the time.

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PUM

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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 a variable connecting rod length, belonging to the technical field of mechanical principles and mechanism. Background technique [0002] The crank connecting rod mechanism can be used in many machinery equipment or instruments. Research has found that the oscillating motion of the slider driven by the connecting rod in the ordinary crank-connecting rod mechanism is not pure sine or cosine motion. When the double-crank-connecting rod mechanism is used, even if the two cranks are installed in anti-symmetrical (phase angle difference 180°), the two slides The distance between the blocks, and thus the distance between the inner end faces of the two pistons driven by the sliding block, cannot be kept constant during the operation of the mechanism. This is an unfavorable factor in some cases, such as the pressure of the working medium between the inner end faces of the two pistons. However, neither th...

Claims

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Application Information

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IPC IPC(8): F16H21/18
Inventor 朱瑞林
Owner 朱瑞林