Throttle Body Bypass Control Assembly
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Solution Overview
Problem
Conventional throttle body assemblies with attached bypass control devices are difficult to assemble and are not compact due to the need for complex machining of the throttle body to form the bypass and valve guide hole, and the assembly of components such as the control valve, screw mechanism, and electric motor, which also increases the size of the throttle body.
Innovation Solution
A separate control base is joined to the throttle body, with communication grooves and holes that allow the bypass control device to be formed and assembled separately, incorporating a control valve and electric motor with a common axis perpendicular to the air intake path, enabling parallel assembly and fine control of air intake, while the metering hole's elongated shape and offset positioning prevent blow-back gas and foreign matter from entering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bypass and valve guide hole are formed completely in the throttle body, then the bypass control device can be integrated, but the machining of the throttle body becomes troublesome and assembly becomes difficult
Solution Approach 1:
The bypass control device is divided into a separate control base that can be manufactured independently from the throttle body. The control base includes the bypass passage, valve guide hole, and metering hole, while the throttle body maintains its primary air intake function. This segmentation allows each component to be manufactured and assembled separately, reducing machining complexity and improving ease of manufacture.
2Reliability
If the dimension of the throttle body in the axial direction is increased to increase the bypass downstream passage length, then foreign matter entry is prevented, but the throttle body size increases
Solution Approach 1:
The bypass downstream passage is configured to extend in a direction perpendicular to the axial direction of the throttle body. The passage includes a lengthwise hole that extends radially outward from the bypass, creating a longer flow path that prevents foreign matter entry without increasing the axial dimension of the throttle body. This dimensional change allows the passage length to be increased in a radial direction rather than axially.
3Device complexity
If the metering hole is positioned directly downstream, then the structure is simple, but blow-back gas and foreign matter can easily enter and cause clogging
Solution Approach 1:
A bypass downstream passage is introduced as an intermediary between the bypass and the metering hole. This passage includes a lengthwise hole that extends radially outward and creates a longer flow path that dampens blow-back gas and prevents foreign matter from directly reaching the metering hole. The intermediary passage acts as a buffer zone that protects the metering hole from clogging while maintaining a relatively simple overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies assembly, enhances assembly efficiency, prevents clogging by damping blow-back gas energy and filtering out foreign matter, and allows for a compact throttle body assembly by forming the bypass control device separately from the throttle body, while maintaining effective control over air intake.
Implementation Method 1
a screw mechanism converting rotation of an output shaft of the electric motor into axial movement and transmitting the axial movement to the control valve
Data Source
Figure 1
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AI summary
In a throttle body assembly with an attached bypass control device, a control base (5) is joined to a mounting face (1a) formed on one side of the throttle body (1), a first communication groove (16) communicating with a downstream end of an upstream passage (14) of the bypass (13) and a second communication groove (17) communicating with an upstream end of a downstream passage (15) of the bypass (13) are formed in the mounting face (1a), a valve guide hole (7), an inflow hole (11) providing communication between the first communication groove (16) and the valve guide hole (7), and a metering hole (10) providing communication between the second communication groove (17) and the valve guide hole (7) and being opened and closed by a control valve (12) are formed in the control base (5), and the valve guide hole (7), the control valve (12), and the electric motor (20) are provided so that a common axis (Y) thereof points in a direction perpendicular to an axis (X) of an air intake path (2), and the metering hole (10) and a downstream end part of the downstream passage (15) are disposed with an offset (S) from each other along the axis (X) of the air intake path (2). This enables the bypass control device to be formed and assembled separately from the throttle body assembly.