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Valve gear for internal combustion engine

A technology for internal combustion engines and valves, applied to valve devices, mechanical equipment, engine components, etc., can solve the problem of a large number of parts and achieve the effect of changing the valve opening characteristics

Inactive Publication Date: 2010-08-11
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem of a large number of parts

Method used

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  • Valve gear for internal combustion engine
  • Valve gear for internal combustion engine
  • Valve gear for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] first refer to Figure 1 to Figure 11 Embodiment 1 of the present invention will be described.

[0070] 〔Overall structure of the valve gear〕

[0071] figure 1 It is a view schematically showing the overall structure of the valve device 10 of the internal combustion engine 1 according to Embodiment 1 of the present invention.

[0072] Here, the internal combustion engine 1 has four cylinders (#1 to #4), and is an inline four-cylinder engine that performs a combustion expansion process in the order of #1→#3→#4→#2. Furthermore, each cylinder of the internal combustion engine 1 has two intake valves and two exhaust valves. and, figure 1 The shown structure functions as a mechanism for driving two intake valves or two exhaust valves provided in each cylinder.

[0073] The valve device 10 of the present embodiment has a camshaft 12 . The camshaft 12 is connected to a crankshaft (not shown) through a timing chain or a timing belt, and rotates at 1 / 2 the crankshaft speed...

Embodiment 2

[0155] Next, refer to Figure 12 Example 2 of the present invention will be described.

[0156] The structure of the valve device 10 of the present embodiment is the same as that described above except for the setting of the helical groove 80 provided on the large-diameter portion 62 of the camshaft 12. Figure 7 Except for the difference in the setting of the helical groove 64 shown, it has the same structure as the valve device 10 of the first embodiment described above.

[0157] Figure 12 It is a developed view for explaining the setting of the helical groove 80 in Embodiment 2 of the present invention.

[0158] In above-mentioned embodiment 1, with above-mentioned Figure 7 In the illustrated form, the helical groove 64 is set so that most of the shallow groove portion 64c of the helical groove 64 gradually becomes shallower from the end 64b side is located in the lift section. Also, the timing E, that is, the timing at which the function of the retaining slide pin 58...

Embodiment 3

[0163] Next, refer to Figure 13 and Figure 14 , Embodiment 3 of the present invention will be described.

[0164] The structure of the valve device 10 of this embodiment is the same as that of the valve device 10 of the first embodiment except for the difference in the structure of the joint portion between the notch portion 90 e of the slide pin 90 and the lock pin 92 .

[0165] Figure 13 is an enlarged view of the bonding portion in Embodiment 1, which is used for comparison with the structure of Embodiment 3 of the present invention.

[0166] exist Figure 13 In the shown structure, the inner surface of the notch part 58e of the slide pin 58 and the peripheral surface of the lock pin 70 which consists of a single diameter are joined. This combination requires two properties. That is, the first performance is the performance of receiving and holding the slide pin 58 against the urging force of the return spring 56 , and the second performance is a good response perfo...

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Abstract

A valve gear mechanism for an internal combustion engine, capable of changing valve-opening characteristics of a valve. The mechanism can smoothly change valve-opening characteristics by using a simplified structure without causing an increase in the number of parts and without causing an increase in sliding friction. A valve gear has a switching mechanism (24) for switching connection and disconnection between rocker arms (32, 34) arranged between a valve (18) and cams (14, 16). When a slide pin (58) reaches an displacement end (Pmax2) in the direction in which a slide pin (58) is retracted,the urging force of a return spring (56) acting on switching pins (48, 54L, 54R) is received by an engaging portion, formed between a notch (58e) provided in the slide pin (58) and a rock pin (70), with the engaging portion separated from a camshaft (12).

Description

technical field [0001] The invention relates to a valve device of an internal combustion engine, in particular to a valve device of an internal combustion engine capable of changing the valve opening characteristic of the valve. Background technique [0002] In the prior art, for example, Patent Document 1 discloses a valve device for an internal combustion engine. In the valve device of the internal combustion engine, a cam push rod equipped with two types of cams is provided on each cylinder, and by making the cam push rod The valve driving cams of the respective cylinders are switched by moving in the axial direction relative to the rotationally driven cam shaft. More specifically, in such a conventional valve train, there are helically formed guide grooves at both ends of the outer peripheral surface of each cam pusher. In addition, each guide groove has an electric actuator that drives a drive pin that can be inserted into and pulled out of the guide groove. [0003] ...

Claims

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Application Information

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IPC IPC(8): F01L13/00
CPCF01L13/0036F01L1/185F01L2105/00F01L2820/031F01L2250/04F01L2250/02F01L2013/0052F01L1/267F01L13/0005F01L1/2405Y10T74/20882F01L2305/00
Inventor 江崎修一锦织贵志木户冈昭夫
Owner TOYOTA JIDOSHA KK
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