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Cam sliding block locating mechanism for variable valve lifting mechanism

A cam slider and valve lift technology, which is applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve the problem of inaccurate positioning of the cam slider, which affects the efficiency of the variable valve lift mechanism, and the cam line shape. Imperfection and other problems, to achieve the effect of long-term perfect cam line shape, simple and reliable structure, convenient processing and assembly

Active Publication Date: 2016-02-10
HANGZHOU XZB TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among them, a better variable valve lift mechanism is a structure in which a cam slider is provided on the cam, and the line shape of the cam is changed through the activity of the cam slider to achieve the purpose of variable valve lift, but there is a problem of the cam slider. The movement is easy to deviate, the positioning is inaccurate, and the problem of shaking in the circumferential direction occurs. The mechanism is unstable and easy to be damaged, resulting in imperfect line shape of the cam, which affects the efficiency of the variable valve lift mechanism.

Method used

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  • Cam sliding block locating mechanism for variable valve lifting mechanism
  • Cam sliding block locating mechanism for variable valve lifting mechanism
  • Cam sliding block locating mechanism for variable valve lifting mechanism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0037] Implementation mode one: if Figure 1-3 As shown, the cam slider positioning mechanism for the variable valve lift mechanism includes an inner shaft 1, an outer shaft 2 and a cam 3, the inner shaft 1 can move axially in the outer shaft 2; the cam 3 is provided with a slider Slot 3.1a, the slider groove 3.1a is provided with a cam slider 4 that can realize radial movement, and the bottom of the cam slider 4 is provided with an arc groove 4.1a, and the arc of the arc groove 4.1a is the same as that of the inner shaft 1 matching; the inner shaft 1 is provided with an annular small-diameter section 1a of a certain axial length, and a certain slope is provided between the small-diameter section 1a and the outer surface of the inner shaft 1; an opening 2a is provided on the outer shaft 2, and the cam slider 4 passes through The opening 2a is in contact with the inner shaft 1, and the radial movement of the cam slider 4 is controlled by the inner shaft 1.

[0038] The cam 3 a...

Embodiment approach 2

[0040] Implementation mode two: if Figure 4-7 As shown, the difference from Embodiment 1 lies in the positioning mechanism. The positioning mechanism includes: the slider groove 3.2a on the cam 3, and the cam 3 is respectively provided with a pin hole 3.2b and a The radial guide rail 3.2c; the cam slider 4 is provided with a radial waist-shaped hole 4.2b corresponding to the pin hole 3.2b, and a guide rail groove 4.2a matching the guide rail 3.2c; the cotter pin sleeve 11 passes through the waist Shaped hole 4.2b, positioning pin 9 passes through cotter pin sleeve 11 and front and rear pin hole 3.2b, and is fixed on the cam 3.

[0041] The working principle is: the axial movement of the inner shaft 1 makes the cam slider 4 move outside the small-diameter section 1a when the high lift works, and the cam slider 4 moves radially to lift up along the slider groove 3.2a, and the radial movement is controlled by the guide rail 3.2a. c and guide rail groove 4.2a guide positioning f...

Embodiment approach 3

[0042] Implementation mode three: if Figure 8-10 As shown, the difference from Embodiment 1 and Embodiment 2 lies in the positioning mechanism. The positioning mechanism includes: a slider groove 3.3a on the cam 3, and pin holes 3.3b are arranged on the front and rear sides of the slider groove 3.3a on the cam 3 A radial waist-shaped hole 4.3b is provided on the cam slider 4 corresponding to the pin hole 3.3b; a positioning pin 8 is provided to pass through the waist-shaped hole 4.3b and the front and rear pin holes 3.3b, and is fixed on the cam 3; The bottom of the cam slider 4 is provided with an arc groove 4.3a, and the arc of the arc groove 4.3a matches the arc of the inner shaft 1.

[0043] The working principle is: when the high lift works, the axial movement of the inner shaft 1 moves the cam slider 4 to the outside of the small diameter section 1a, the cam slider 4 moves radially and lifts up along the slider groove 3.3a, and the positioning pin 8 and the waist shape ...

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PUM

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Abstract

The invention discloses a cam sliding block locating mechanism for a variable valve lifting mechanism. The cam sliding block locating mechanism comprises a cam shaft and a cam, wherein the cam shaft comprises an inner shaft and an outer shaft; the inner shaft can perform axial movement inside the outer shaft; a sliding block groove is formed in the cam; a cam sliding block capable of achieving radial movement is arranged in the sliding block groove; when the cam sliding block retracts, the outer contour of the cam does not have change, and when the cam sliding block stretches out, the outer contour of the cam has bulges; and the locating mechanism used for locating and guiding the radial movement of the cam sliding block is arranged on the cam and the cam sliding block. According to the cam sliding block locating mechanism, the structure is simple and reliable, the control is easy, the parts are less, the assembly is compact, the processing and assembly are relatively convenient, the reliability is high, and the cost is low; the cam sliding block achieves the radial movement and return under the driving of the inner shaft of the cam shaft and an external cam follower, and the radial location of the cam sliding block is achieved through the locating mechanism; the specially designed locating mechanism is used, and the cam sliding block can be highly lifted and located inside the cam successfully, and can be located after return, so that the mechanism is enabled to be stable.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a cam slider positioning mechanism for a variable valve lift mechanism. Background technique [0002] The maximum valve lift of a traditional engine is fixed and invariable during normal operation, that is, there is only one cam profile of the camshaft. This makes it impossible for the lift to make the engine respond well in both high-speed and low-speed areas. The valve lift of the traditional engine - the design of the cam profile is a balanced choice for the engine under all working conditions. As a result, the engine can neither get the best high-speed efficiency nor the best low-speed torque. The most balanced performance under all working conditions. [0003] However, with the development of the automobile industry, people have higher and higher requirements on engine performance, fuel consumption and emissions. Variable valve lift technology has become one of Peugeot's k...

Claims

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Application Information

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IPC IPC(8): F01L13/00F01L1/06
Inventor 徐纳任海军
Owner HANGZHOU XZB TECH