CN2095285U

CN2095285U - Non-impact cam special for high-speed strengthened gasoline engine

Info

Publication number: CN2095285U
Application number: CN 91212657
Authority: CN
Inventors: 范崇武; 刘晓华; 张志明; 孙郑慧
Original assignee: CHANGSHA INST OF AUTOMOBILE ENGINE HUNAN
Current assignee: CHANGSHA INST OF AUTOMOBILE ENGINE HUNAN
Priority date: 1991-05-10
Filing date: 1991-05-10
Publication date: 1992-02-05

Abstract

The utility model relates to a non-impact cam special for a high-speed strengthened gasoline engine. The equation of the working section of the profile of the cam is that Y=L (1+C[1]X< 2 >+C[4]X< 4 >+C[p]X[p]+C[q]X[q]+C[gamma]X[gamma]+C[s]X[s]). The utility model is characterized in the equation, wherein, the range of L is from 7.0MM to 7.5MM, the range of C[2] is from-1.5 to 1.7, C[4] equals to 0.140, the range of C[p] is from 8.0 to 13.0, the range of C[q] is from-11 to 26, the range of Cy is from 4 to 15, the range of Cs is from-0.9 to 1.6, the range of P is from 10 to 16, the range of q is from 16 to 18, the range of gamma is from 18 to 22, and the range of S is from 22 to 24. Moreover, the range of the base radius phi is from 15MM-20MM, and the contact width between the cam and a tappet is 18MM. The total lift range is from 7.2MM to 8.0MM. The total wrap angle is from 190DEG to 210DEG. The lift range of a working section is from 7.0MM to 7.5MM. The wrap angle theta of the working section is from 120DEG to 130DEG. The lift range of a buffer section is from 0.2MM to 0.5MM. The wrap angle theta [1]+theta [2] of the buffer section is from 70DEG to 80DEG. The utility model has the advantages of good dynamic characteristic, no impact and abrasion resistance.

Description

Non-impact cam special for high-speed strengthened gasoline engine

The utility model belongs to the cam profile improved design of the distribution device of motor, mainly is applicable on 492Q, 495Q petrol engine and the variant machine thereof after the reinforcement.

Along with development of science and technology, China 492Q petrol engine has carried out repeatedly improving, and power, moment of torsion improve constantly.Chinese patent application number is 90219807.6 " four-cylinder intensified gasoline engine ", is keeping under the constant prerequisite of former 492Q petrol engine production line, and after structure-reinforced, power increases to 110 horsepowers by 85 horsepowers, and moment of torsion increases to 20.5kgm by 18.5kgm.Original distribution device can not adapt to requirement, and especially cam profile can not satisfy requirements such as its lift, intensity.

The purpose of this utility model just is to provide a kind of and is exclusively used in reinforced 492Q, 495Q petrol engine, and can satisfy the no impact cam of its power character, intensity and other performance requirement.

The technical solution of the utility model is that the active section of cam profile still adopts high power equation, but parameter is made new choose reasonable, elaborates below in conjunction with accompanying drawing:

Accompanying drawing 1 is a front view of the present utility model, also is the cam type line chart.As shown in Figure 1, cam profile of the present utility model is by basic circle, breeze way (Q ₁, Q ₂Institute's corresponding circle segmental arc), three sections compositions of active section (Q institute corresponding circle segmental arc), its active section is high power equation, its equation is:

Y＝L（1＋C ₁X ²＋C ₄X ⁴＋CpX ^P＋CqX ^q＋C _γXγ＋CsX ^S）

Wherein: X---cam angle;

Y---tappet lift on the cam;

Outstanding feature of the present utility model is in the aforesaid equation:

L＝7.0－7.5mm

C ₂＝－1.5－－1.7 C ₄＝0.140

Cp＝8.0－13.0 Cq＝－11－－26

C _γ＝4－15 Cs＝－0.9－－1.6

p＝10－16 q＝16－18

γ＝18－22 s＝22－24

The parameter Base radius φ of cam profile is 15-20mm, with the contact width of tappet be 18mm, total lift is 7.2-8.0mm, total cornerite is 190 °-210 °, the active section lift is 7.0-7.5mm, the active section wrap angle is 120 °-130 °, and the breeze way lift is 0.2-0.5mm, the breeze way wrap angle ₁+ θ ₂It is 70 °-80 °.

The inventor takes above-mentioned cam profile, and the camshaft of making has following advantage: 1. profile symmetry, and high-order can be led continuously, makes distribution device keep a level and smooth continuous acceleration; 2. have bigger valve lift, can increase air inflow, obtain good power character; 3. the contact width of Base radius and cam and tappet all increases, and has reduced the wearing and tearing between tappet.

Through being used for 492Q modification Series Gasoline Engines, (annotate: in order to alleviate the contradiction that lift brings accekeration to increase, calculating rotating speed is chosen in the 100-120% scope of rated speed, can guarantee the good dynamic property of distribution device in rated speed, in addition, adopting less valve overlap, can guarantee that idling is stable and steam discharge is clean) performance index reach, and rated power (horsepower) is 105-115; Maximum Torque (kilogram-metre) is 20-205; Minimum specific fuel consumption (gram/horsepower-hour) 205-210.

Claims

1, the special-purpose no impact cam of a kind of high-speed enhanced petrol engine, its cam profile active section is high side's equation, equation is:

Y=L(1+C ₁X ²+C ₄X ⁴+C _PX ^P+C _qX ^q+C _γX ^γ+C _sX ^s)

Wherein: the X-cam angle;

Tappet lift on the Y-cam;

Of the present utility model being characterised in that in the aforesaid equation:

L=7.0-7.5mm

C ₂=-1.5--1.7 C ₄=0.140

C _p=8.0-13.0 C _q=-11--26

C _γ=4-15 C _s=-0.9--1.6

P=10-16 q=16-18

γ=18-22 S=22-24

The parameter Base radius φ of cam profile is 15-20mm, with the contact width of tappet be 18mm, total lift is 7.2-8.0mm, total cornerite is 190 °-210 °, and the active section lift is 7.0-7.5mm, and the active section wrap angle is 120 °-130 °, the breeze way lift is 0.2-0.5mm, the breeze way wrap angle ₁+ θ ₂It is 70 °-80 °.