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Design method of inner curved surface of stator for booster vacuum pump for brake

A technology of booster vacuum pump and curved surface design, which is applied to the components, pump components, mechanical equipment, etc. of the pumping device for elastic fluid, which can solve the problem of reducing the life and braking performance of booster vacuum pump, increasing rotor wear speed, vibration and noise. and other problems, to achieve the effect of good operation performance, stable output flow and high efficiency

Inactive Publication Date: 2017-08-08
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, one of the key technologies of the booster vacuum pump is the smoothness of the inner surface of the stator. If the inner surface is not designed properly, it will cause air leakage, vibration and noise, and increase the wear speed of the rotor, thereby directly reducing the life of the booster vacuum pump and braking performance

Method used

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  • Design method of inner curved surface of stator for booster vacuum pump for brake
  • Design method of inner curved surface of stator for booster vacuum pump for brake
  • Design method of inner curved surface of stator for booster vacuum pump for brake

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] The present invention is a method for designing the inner curved surface of the stator of a booster vacuum pump for braking, such as figure 1 As shown, the entire stator curve is smoothly connected by arc curves and transition curves, which are arc segment AB, high-order curve segment BC, involute segment CD, high-order curve segment DE, and arc segment EF. Composite curves are symmetric about the XY axis. Therefore, as long as the 1 / 4 profile is obtained, the inner curve of the entire stator can be obtained according to the symmetry. The steps are as follows:

[0026] Step 1, the radius ρ(θ) from the center O of the profiled line on the stator surface to any point on the curve is a function of the rotation angle θ, starting from 1 / 4 of the profiled line, the range of θ is [0,90°]. definition is the velocity of the curve, is the acceleration of the curve,...

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Abstract

The invention provides a method for designing the stator inner curved surface of a booster vacuum pump for braking. The entire stator curve is formed by smooth connection of arc curves and transition curves, which are arc segment AB, high-order curve segment BC, involute segment CD, The high-order curve segment DE and the arc segment EF; the composite curve is symmetrical about the XY axis; therefore, as long as the The profile line of the entire stator can be obtained according to the symmetry. In the present invention, a high-order curve is added in the middle of the original profile as a transition curve, so that the curve becomes smoother, the vibration shock phenomenon is eliminated, and the working life of the booster vacuum pump is effectively improved.

Description

technical field [0001] The invention relates to a method for designing the inner curved surface of a stator of a booster vacuum pump for braking. Background technique [0002] The booster vacuum pump for brakes is a vacuum chamber with a large diameter. There is a diaphragm (or piston) with a push rod in the middle inside. The vacuum chamber and the piston are eccentrically installed to separate the chamber into two parts. One part communicates with the atmosphere, and the other part is connected with the engine intake pipe through a pipeline. It uses the principle of inhaling air when the car engine is working to cause a vacuum on one side of the booster pump, and the pressure difference compared to the normal air pressure on the other side, and use this pressure difference to strengthen the braking thrust. The use of the vacuum booster braking system can improve braking feasibility and reduce driver fatigue, which is beneficial to reduce the incidence of traffic accidents...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C29/00
Inventor 桑小虎周晓君
Owner SHANGHAI UNIV
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