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Valve timing controller

A valve timing and controller technology, applied in the direction of machines/engines, non-mechanically actuated valves, engine components, etc., can solve the problems of large radial size, increased number of components, and large size of valve timing controllers , to achieve high running accuracy and maintain the effect of running precision

Active Publication Date: 2013-02-13
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the outer diameter of the helical biasing member engages with the pin is relatively large, the radial dimension of the biasing member becomes large so that the size of the valve timing controller also becomes large.
Furthermore, in addition to engaging the outer end of the biasing member, an additional pin is required to engage the inner end of the biasing member, which increases the number of parts

Method used

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  • Valve timing controller
  • Valve timing controller
  • Valve timing controller

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0023] Figures 1 to 7 A valve timing controller according to the first embodiment is shown.

[0024] image 3 A driving force transmission system to which the valve timing controller 10 is applied is schematically shown. Engine 6 has sprocket 81 fixed to crankshaft 8 as a driving shaft of engine 6 , gear 138 coaxially connected to camshaft 7 as a driven shaft, and sprocket 92 connected to camshaft 9 . The chain 5 is wound around the sprocket 81 , the sprocket 92 and the gear 138 , whereby the driving force of the crankshaft 8 is transmitted to the camshafts 7 and 9 . The gear 138 and the vane rotor 16 which will be described later configure a part of the valve timing controller 10 . The camshaft 7 drives the exhaust valve 71 and the camshaft 9 drives the intake valve 91 . The vane rotor 16 is connected to the camshaft 7 . The valve timing controller 10 adjusts the valve timing of the exhaust valve 71 .

[0025] Such as figure 1 and 2 As shown, the valve timing control...

no. 2 approach

[0075] refer to Figure 8 , the second embodiment will be described. In the second embodiment, the shape of the biasing member and the position where the engaging portion engages with the outer end of the biasing member are different from those in the first embodiment.

[0076] The total length of the wire 260 of the spring 26 is set shorter than that in the first embodiment. The position of the engagement pin 24 is different from that in the first embodiment. Such as Figure 8 As shown, the inner end 261 and the outer end 262 respectively Engages with the engagement groove 167 and the engagement pin 24 . Engagement pin 24 is located near line "L" in the winding direction. In the present embodiment, the engagement pin 24 is located at a position where the axis line "Ax2" intersects the line "L0".

[0077] Figure 8 The vane 161 is shown in contact with the stop surface 135 . That is, the vane rotor 16 is advanced maximally. In this case, the specific points “sp1”, “sp...

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PUM

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Abstract

A valve timing controller has a spiral spring biasing a vane rotor in an advance direction. An inner end and an outer end of the spring are respectively engaged with an engage groove and an engage pin in such a manner that a center of a most inner imaginary circle passing through a center line of the wire is apart from a center of a most outer imaginary circle passing through both the center line of the wire and an engage point between the inner end and the engage groove. The most outer imaginary circle is eccentric to the most inner imaginary circle by a specified amount.

Description

technical field [0001] The present invention relates to a valve timing controller that changes a valve timing of at least one of an intake valve and an exhaust valve according to engine driving conditions. Background technique [0002] A valve timing controller having a vane rotor adjusts a valve opening / closing time of at least one of an intake valve and an exhaust valve by changing a differential phase between a camshaft and a crankshaft of an engine. JP-2003-120229A and JP-2009-523943A (US-2010-0154732A1) show a valve timing controller provided with a biasing member that biases the vane rotor against the housing The maximum advance position or the maximum lag position. [0003] In the valve timing controller shown in JP-2003-120229A, the helical biasing member biases the vane rotor toward the most advanced position relative to the housing. The inner end of the helical bias member engages a slot formed in a boss of the vane rotor. The outer ends of the helical biasing m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/34F01L9/02
CPCF01L1/3442F01L1/34F01L9/02F01L2001/34469F01L2001/34483F01L2001/34456F01L1/344F01L2001/34479
Inventor 中村拓司
Owner DENSO CORP