Recently, Mitsubishi Motors Corporation President Yi Zixu revealed in an interview with Tencent Auto that Mitsubishi will no longer develop imported car business in China, and the focus in China will be placed in GAC Mitsubishi.
Mitsubishi Motors has less than 100,000 units in the Chinese market. In 2013, sales of Guangzhou Automobile Mitsubishi, Southeast Mitsubishi and Mitsubishi imported vehicles totaled 68,000 units. There is no public data showing the specific sales of Mitsubishi imported cars, but according to Mitsubishi Motors. According to the plan announced at the end of 2012, the sales volume of imported cars will reach 25,000 in 2013.
The reason why the business of imported cars was stopped was mainly to be able to focus on Mitsubishi's business in China. Yi Zixu said: "Mitsubishi is no longer developing more imported cars in China." He hopes that GAC Mitsubishi's production and sales will reach 130,000 vehicles as soon as possible. . And "I hope to reach 200,000-300,000 in 5 years."
Mitsubishi's development in China is not short, but it can be described as twists and turns. As one of the earliest brands to enter China and foreign brands, Yi Zixiu said frankly that Mitsubishi has always hoped to have a 50:50 partner, but it was not until September 2012 that it ushered in the first 50:50 joint venture in China. Yizi Xiu waited for a long time, which also led to the development of Mitsubishi in China. Yizi Xiu once proposed that in 2015, he hopes Mitsubishi will achieve sales of 300,000 units in China. But the reality of the data is far from the same. Mitsubishi Motors, which is small in scale and too thin in its product line, can only hope for the Guangzhou Automobile Mitsubishi in the Chinese market.
GAC Mitsubishi has officially started mass production in 2013 and currently has two domestic models. "Guangzhou Mitsubishi is still a baby, I hope that the baby will grow up quickly," he said.
According to Mitsubishi's plan, GAC Mitsubishi still takes the development of SUV as the main direction. Yizi Xiu told Tencent Auto that Mitsubishi will continue to expand its SUV products at GAC Mitsubishi. But at the same time, in the past 2-3 years, we will always pay attention to the needs of the Chinese market to consider whether to introduce car products.
He did not disclose the specific product plan, only said that in the market, the most popular Outlander in the upcoming model candidates, "if introduced, will be as soon as possible", Yi Zixu also hopes to introduce Mitsubishi EV or PHEV in China as soon as possible. Model. He stressed that EV and PHEV are the future direction and also the advantage of Mitsubishi Motors.
Angular contact Ball Bearings
Angular Contact Ball Bearing has high
limit rotational speed, they can carry radial load and axial load
simultaneously, they can also withstand purely radial load. The axial load
carrying capacity depends on the magnitude of contact angle and increases with
increasing contact angle.
Structures
1.
Non-separable
angular contact ball bearings
This inner ring and outer ring of this
type of bearings cannot be separated and comprises following structures:
Contact
angle α=15° counter bore on outer
ring,7000Ctype
Contact
angle α=25° counter bore on outer
ring,7000ACtype
Contact
angle α=40° counter bore on outer
ring, 7000B type
2. Four-point
contact ball bearings
This type of bearings is separable
bearings. Whereof, QJ0000 type has two-piece inner ring and QJF0000 type has
two-piece outer ring. Their contact angles are same as 35°.When received no
load or pure radial load, the steel balls of the Ball Bearing contact with the
four points of the rings. When it is received a pure axial load, the steel
balls perform a two-point contact with the ring. In addition, besides the axial
load from both directions, this kind of bearing can take torque-load as well.
3.
Double
row angular contact ball bearings
This kind of bearings can accommodate
radial loads as well as axial loads acting in both directions; they can also
take loading moment. They can restrain the axial displacement from both
directions of the shaft or housing; the contact angle is 30° (or 40°)
Permissible tilt angle
There is only a little inclination
between the inner ring and outer ring of angular contact bearings, the
permissible tilt angle varies according to the internal clearance when the
bearings are operating, the bearing dimensions, internal design, force and loading
moment received by the bearings. The value of the maximum permissible tilt
angle should be able to ensure that no much extra stress to be generated inside
the bearings.
The tilt angle existing between the
inner ring and outer ring will influence the bearing service life. Meanwhile,
the running accuracy is decreased down and noise increased.
Tolerance and clearance
The tolerances of general angular
contact bearings are class normal P0, class P5 and P6. Class P4 and P2 are applicable
to machine tool spindles and bearing amount in pairs.
Clearance
of single row angular contact bearing is decided by the contact angle, which is
guaranteed by manufacturing.
Axial clearance of Four-point contact ball bearings is listed in
table 1.
Cage material
Generally, the cage of angular contact
bearing is pressed cage of steel sheet or brass cage, and it is solid brass
cage for two row angular contact bearing.
Dynamic equivalent radial
load
Single-row
angular contact ball bearings with a contact angle of 15°
Single
bearing or bearing in pairs(7000
C.7000
C/DT)
Fa/Fr≤e Pr=Fr
Fa/Fr>e Pr=0.44Fr+YFa
Back-to-back
and face to face arrangements(7000
C/DB.7000 C/DF)
Fa/Fr≤e Pr=Fr+Y1Fa
Fa/Fr>e Pr=0.72Fr+Y2Fa
Single-row
angler contact ball bearings with a contact angle of 25°
Single
bearing or bearing in pairs(7000
AC.7000
AC/DT)
Fa/Fr≤0.68 Pr=Fr
Fa/Fr>0.68 Pr=0.41Fr+0.87Fa
Back-to-back
and face to face arrangements(7000
AC/DB.7000 AC/DF)
Fa/Fr≤0.68 Pr=Fr+0.92Fa
Fa/Fr>0.68 Pr=0.67Fr+1.41Fa
Single-row
angular contact ball bearings with a contact angle of 40°
Single
bearing or bearing in pairs (7000 B.7000
B/DT)
Fa/Fr≤1.14 Pr=Fr
Fa/Fr>1.14 Pr=0.35Fr+0.57Fa
Back-to-back
and face to face arrangements(7000 B/DB.7000
B/DF)
Fa/Fr≤1.14 Pr=Fr+0.55Fa
Fa/Fr>1.14 Pr=0.57Fr+0.93Fa
Four
point contact ball bearings with a contact angle of 35°
Fa/Fr≤0.95 Pr=Fr+0.66Fa
Fa/Fr>0.95 Pr=0.6Fr+1.07Fa
Double-row
angular contact ball bearings with a contact angle of 45°
Fa/Fr≤1.34 Pr=Fr+0.47Fa
Fa/Fr>1.34 Pr=0.54Fr+0.81Fa
Static equivalent radial
load
Single-row
angular contact ball bearings with a contact angle of 15°
For
single bearing or bearing in pairs(7000 C.7000 C/DT)
P0r=0.5Fr+0.46Fa
P0r<Fr P0r=Fr
For
back-to-back and face-to-face arrangements (7000 C/DB.7000 C/DF)
P0r=Fr+0.92Fa
Single-row
angular contact ball bearings with contact angle of 25°
For
single bearing or bearing in pairs (7000 AC.7000 AC/DT)
P0r=0.5Fr+0.38Fa
when
P0r<Fr let P0r=Fr
For
two bearings in back-to-back and face-to-face arrangements
P0r=Fr+0.76Fa
Single-row
angular contact ball bearings with contact angle of 40°
For
single bearing or bearing in pairs
P0r=0.5Fr+0.26Fa
when
P0r<Fr let P0r=Fr
For
two bearings in back-to-back and face-to-face arrangements
P0r=Fr+0.52Fa
Four
point contact ball bearings
P0r=Fr+0.58Fa
Double-row
angular contact ball bearings with contact angle of 45°
P0r=Fr+0.44Fa
Fr Actual radial load of the bearing.
Fa Axial load of the bearing
The
values of e .Y .Y1 .Y2 see Table
2.
Table 1 Axial internal clearance of four point
contact ball bearings
μm
|
Nominal bore diameter d
mm
|
C2
clearance
|
Standard
clearance
|
C3
clearance
|
C4
clearance
|
|
Over
|
To
|
Min
|
Max
|
Min
|
Max
|
Over
|
To
|
Min
|
Max
|
|
10
18
40
60
80
100
140
180
220
260
|
18
40
60
80
100
140
180
200
260
300
|
15
26
36
46
56
66
76
96
115
135
|
55
66
86
96
116
136
156
176
195
215
|
45
56
76
86
96
116
136
156
175
195
|
85
106
126
136
156
176
196
216
235
275
|
75
96
116
126
135
156
176
196
215
255
|
115
146
166
176
196
216
236
256
295
335
|
105
136
156
166
176
196
216
236
275
295
|
145
186
206
216
236
256
276
296
335
355
|
Table 2 Calculate
Coefficient
μm
|
|
e
|
Y
|
Y1
|
Y2
|
|
0.172
0.345
0.689
1.03
1.38
2.07
3.45
5.17
6.89
|
0.38
0.4
0.43
0.46
0.47
0.5
0.55
0.56
0.56
|
1.47
1.4
1.3
1.23
1.19
1.12
1.02
1
1
|
1.65
1.57
1.46
1.38
1.34
1.26
1.14
1.12
1.12
|
2.39
2.28
2.11
2
1.93
1.82
1.66
1.63
1.63
|
Dw
is the diameter of the rolling element
Angular Contact Ball Bearing
Machined Cage Angular Contact Ball Bearing,Pressed Cage Angular Contact Ball Bearing,One Row Angular Contact Ball Bearing,Two Row Angular Contact Ball Bearing
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