CN86105524A - A kind of all balance method of connecting rod - Google Patents
A kind of all balance method of connecting rod Download PDFInfo
- Publication number
- CN86105524A CN86105524A CN86105524.1A CN86105524A CN86105524A CN 86105524 A CN86105524 A CN 86105524A CN 86105524 A CN86105524 A CN 86105524A CN 86105524 A CN86105524 A CN 86105524A
- Authority
- CN
- China
- Prior art keywords
- connecting rod
- weight
- equilibrium block
- balance
- crankshaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The present invention relates to a kind of method that causes the device vibration owing to connecting rod that is used for reducing, be specially adapted to internal-combustion engine and air compressor vibration damping, specifically adopted a connecting rod equilibrium block to be attached on the connecting rod cap, thereby and according to the shape of corresponding calculated formula correction crankshaft balance weight and the full balance of weight realization connecting rod crank mechanism, vibration 10-30% be can reduce, thereby the application area and the accurate grade of connecting rod enlarged.
Description
The present invention is a kind of balance method that connecting rod shakes that reduces, particularly for single all balance method that overlaps the crank linkage mechanism.
The balance method of connecting rod has had many kinds, as the uniaxiality balance of explosive motor, double-shaft balance.Machine inner equilibrium etc.These balance methods all are that reciprocal inertia force is launched by Newton binomial:
X
ε=m
pR ω
2(cos θ+go into cos2 θ+...)
In the formula: X-inertial force;
m
p-motor reciprocation mass;
The radius of gyration of r-engine crank;
The rotational angular velocity of ω-engine crank;
The corner of θ-engine crank;
Be divided into inertial force at different levels.(with reference to figure 1) is common, for convenience of calculation, has ignored the above inertial force of secondary, all is approximation method.Utilize this method result calculated made high speed, high-power internal combustion engine, air compressor etc. can produce very big vibration, thereby have limited further applying of connecting rod.
The purpose of this invention is to provide a kind of all balance method, make existing connecting rod, the vibration index of particularly single cover crank linkage mechanism has decline by a relatively large margin.
The present invention is achieved in that promptly the connecting rod and the connecting rod cap (1) of crank joint at existing connecting rod, adds a connecting rod equilibrium block (2) that adapts with the connecting rod size, and the shape and the weight of change crankshaft balance weight.
In order to determine the weight of connecting rod equilibrium block and crankshaft balance weight, derive the new formula of a reciprocal inertia force that the above inertial force of secondary is taken into account:
X
Z＝m
prω
2（cosθ+u1+u2）
U wherein
1=go into that cos2 θ/(1-goes into
2Sin
2θ)
1/2
u
2=
Sin
22 θ/(1-goes into
2Sin
2θ)
3/2
X
ε=reciprocation mass inertial force
m
p=internal-combustion engine or air compressor reciprocation mass.
R=crankshaft rotation radius
ω=crankshaft angular speed
θ=crank angle
Go into=r/L, L is a length of connecting rod
According to u
1, u
2, the weight of connecting rod equilibrium block is obtained as follows:
m
B＝（3-10）% (m
P·L)/(r
B)
In the formula: m
B-institute adds the connecting rod mass of balance block
r
B-m
BBarycenter be connected the distance at center with crank to connecting rod
(3-10) % is a posterior infromation.
For ease of the stationary links equilibrium block, the connecting rod equilibrium block is made the crescent shape (Fig. 2) of removing two jiaos.Be screwed at connecting rod and crank joint (referring to Fig. 4) or directly adding man-hour and be integrated.
On original explosive motor or air compressor, in order to solve vibration problem, generally at the former equilibrium block that is added with of crank bearing., be under the enough big situation of excessive balance now, just only add the connecting rod equilibrium block, no longer change the weight of crankshaft balance weight at original crankshaft balance weight owing to added a connecting rod equilibrium block at connecting rod and crank joint; If original crankshaft balance weight is non-excessive balance,, in the time of can not offsetting the weight of connecting rod equilibrium block, then need to increase the weight of crankshaft balance weight though perhaps be excessive balance.When increasing crankshaft balance weight, need to satisfy simultaneously following formula:
△G
R·R＞m
B·r
(△ G
RR-m
BR)＜go into m
BR
B
△ G in the formula
RThe weight that-crankshaft balance weight need increase.
R-need add crankshaft balance weight △ G
RCenter of gravity to the distance of crank center of gravity.
Or, △ G
RR＜go into m
BR
B+ m
BBr
Increase △ G
RMethod, generally can adopt following two kinds of methods, a kind of method is with △ G
RBe fixed together with former crankshaft balance weight; Another kind method is to change the shape of former crankshaft balance weight and suitably increase its weight.Move after changing the center of gravity that the block-shaped Perfected process of former crank balance is former arc crankshaft balance weight, satisfied the needs of balance, the weight that perhaps increases former crankshaft balance weight satisfies the needs of balance.
This balance method and original balance method relatively can make connecting rod one-level inertial force and moment reduce 10-100%, and above inertial force at different levels of secondary and moment reduce 10-30%, thereby its vibration index is significantly descended.
Fig. 1 is the position loss diagram of connecting rod
Fig. 2 is a kind of structural drawing of connecting rod equilibrium block
Fig. 3 is a kind of structural drawing of crankshaft balance weight
Fig. 4 is the connecting rod cap schematic representation that adds the connecting rod equilibrium block
The embodiment of this connecting rod all balance method to shown in Figure 4, is connecting rod equilibrium block and the crankshaft balance weight of using on 12 horsepowers of single cylinder explosive motors as Fig. 2.Implementation methods is to be screwed a connecting rod equilibrium block as shown in Figure 2 at connecting rod and crank joint, and weight is about 500 grams; The 9-12 millimeter is cut away at two ends at former arc crankshaft balance weight upper edge straight section, and strengthen weight 50-100 gram, like this, increase the connecting rod equilibrium block, change the shape and weight of former crankshaft balance weight after, our experiments show that its vibration index is than the vibration index decline 10-30% of former explosive motor.
Claims (4)
1, a kind of method of utilizing the load balance piece to realize the full balance of connecting rod is characterized in that being provided with connecting rod equilibrium block [2] on connecting rod cap [1].
2,, it is characterized in that the connecting rod equilibrium block can be made into the first quarter moon shape of removing two jiaos as the said method of claim 1.
3, as the said method of claim 1, it is characterized in that the connecting rod equilibrium block is fastened on the connecting rod cap with screw or when the processing connecting rod cap be integrated.
4, as the said method of claim 1, it is characterized in that the shape of former crankshaft balance weight and weight fibrous root adjust accordingly according to the connecting rod equilibrium block, concrete with reference to following formula:
△G
R·R＞m
B·r
△ G
RR-m
BR＜go into m
BR
B
The △ GR-crankshaft balance weight weight that need increase wherein
R-△ GR center of gravity is to the distance of crank center of gravity
MB-connecting rod equilibrium block weight
R-crankshaft rotation radius
Go into-r and connecting rod stock ratio
The rB-mB barycenter is to crank-connecting rod hinge joint centre distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86105524.1A CN1003884B (en) | 1986-07-25 | 1986-07-25 | Total balanced method of crank connecting rod system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86105524.1A CN1003884B (en) | 1986-07-25 | 1986-07-25 | Total balanced method of crank connecting rod system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86105524A true CN86105524A (en) | 1988-02-17 |
| CN1003884B CN1003884B (en) | 1989-04-12 |
Family
ID=4802872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN86105524.1A Expired CN1003884B (en) | 1986-07-25 | 1986-07-25 | Total balanced method of crank connecting rod system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003884B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476467A (en) * | 2010-11-25 | 2012-05-30 | 上海华器智能机械设备有限公司 | Novel mechanical pressing machine |
-
1986
- 1986-07-25 CN CN86105524.1A patent/CN1003884B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476467A (en) * | 2010-11-25 | 2012-05-30 | 上海华器智能机械设备有限公司 | Novel mechanical pressing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1003884B (en) | 1989-04-12 |
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| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |