Following the previous issue of “2017 Best Selling Car TOP100†in the previous issue, the “One-point Commentary†of this issue was analyzed based on the focus2move data with the world’s top 50 car brands sold as dimensions. Perhaps contrary to most people's expectations, in the TOP50 brand, the number of Chinese brands actually won the championship for four consecutive years, and is still slowly improving. However, if we look at the absolute value of sales and the average rankings, there is still a big gap between the Chinese auto brands and the world advanced level. The parallel of optimism and caution is the attitude that our industry needs to continue to hold. Top 50 brands, China accounted for a quarter In the past 2017, although the Chinese auto market has ushered in the lowest growth rate in recent years, it still maintains the upward momentum. Therefore, China's own brands have also achieved a new record of overall success. This score has reached a global scale and it is worthwhile to make a comparison. 2017 global auto brand sales list TOP50 Plan focus: · In 2017, the world’s highest-selling 50 car brands, Chinese brands accounted for 13 seats, the largest among the various departments; · The highest ranked Chinese brand is Changan, the 18th; • Toyota has no accidents, and Volkswagen and Ford are also ranked second and third respectively; Mercedes-Benz is the highest in luxury cars. If calculated according to the sales volume of the group, Toyota lost to Volkswagen Group and Renault-Nissan-Mitsubishi Alliance in 2017. However, if only a single brand is calculated, no other brand in the championship position of Toyota can be shaken so far - 87.1333 million vehicles. The record set a new record, and other brands have never even reached 7 million. Volkswagen and Ford’s respective silver and bronze status are equally strong, and there have been no changes since 2014. Of course, Volkswagen has sales of 6,815,111 cars and the highest increase in the top three (4.3%). No surprise future will be the second brand to surpass the 7 million mark. Due to its poor performance in the Chinese market, Ford is the only one in the top three to slip. Honda is the biggest winner in the top ten, although the 8.0% year-on-year increase is not as good as the 9th Renault and the 10th Mercedes, but the latter two ranks have not changed compared to 2016, while Honda has jumped from the 6th. To the fourth, broke into the top five ranks. For Mercedes-Benz, it became the only luxury car in the top ten, and this achievement deserves a special book. Perhaps most readers did not expect that according to the ethnic divisions, the “brilliant†Chinese brands had the most seats in the top 50, with a total of 13 seats: Changan No. 18; Geely No. 21; Wuling No. 23 Bao Jun 28th; Dongfeng 29th; Haval 31st; Chery 38th; BAIC 39th (combined Yubao, Weiwang, etc.); Chuanqi 41st; JAC 46th (including commercial vehicles); Roewe 47th; BYD 48th; Fukuda 49th. In the last 5 of the top 50, there were 4 seats that "by accident happened to catch up" with Chinese brands. In contrast, there are nine Japanese brands on the list, and it can be said that apart from the fall of Isuzu, UD trucks/Guanggang and other niche brands have not been ranked, mainstream Japanese car brands have been included in the list. There are 7, 6, 4, 3, 2, and 2 brands in the US, Germany, France, India, South Korea, and the UK. Italy, Spain, Sweden and South Africa each have a brand ranking. Many Chinese auto brand seats can be viewed from two perspectives. On the one hand, there are more brands to be rewarded. However, on the other hand, because of the large number of brands, the power is dispersed and the rankings are behind, which is not a manifestation of a mature automobile society. In fact, the top 50 Chinese brand seats are not new at all. This has been the case since 2014 and the number has gradually increased from 11 to 13. Four years TOP50 brand each department number In any case, progress needs affirmation, and the gap needs to be addressed. What are the biggest gaps and shortcomings? Sales and rankings are weaknesses Various statistical agencies have their own statistical calibers and data. At the same time, JATO Dynamics also released its own 2017 sales data, but its statistical scope is limited to 52 mainstream markets worldwide, with light vehicles (passenger vehicles and light Commercial vehicle) registration volume / license amount shall prevail. According to JATO Dynamics' global sales volume TOP25 brand sales data for 2017, only three brands, namely Geely, Baojun and Wuling, were selected for the China Automotive Group. Chang'an's failure to participate was partly related to the cut of commercial vehicles, but it also reminded us that in the first half of the original TOP50 list, there were very few Chinese brands. Plan focus: · The average Chinese brand ranking is about 35; · There is not much difference between the sales volume of 13 brands in China and the sales volume of two brands in South Korea, which is far inferior to the Japanese, American and German brands; · Chinese brand sales maintained growth in 2017, but the average rankings declined; · Japanese car sales and rankings continue to rise. The “One-Point Review†focused on the statistics of focus2move over the past four years and found that from 2014 to 2017, the total sales of Chinese brands in the Top 50 grew fastest, only suddenly “braking†in 2017, and the growth rate was almost In stagnation. In addition, the total sales of the Chinese brands in the Top 50 have not yet crossed the tens of millions of vehicles, while the American and German systems are about 15 million, and the Japanese system is more than 25 million. Four years sales of TOP50 brands Since we know that the current annual sales of light vehicles in the world are around 97 million, this means that Japanese cars always account for more than a quarter of the total, while the U.S. and German lines are close to one sixth, and Chinese brands can only take One-tenth of the market. Although Korean brands always have only Hyundai and Kia to enter the top 50, while Renault-Samsung and Ssangyong missed the TOP50, only these two brands achieved a total sales volume of nearly 8 million vehicles, and accumulated 988 brands with 13 Chinese brands. Millions are not far away. Even according to the statistics of focus2move, among the top 25 brands, there are only Changan, Geely and Wuling brands, and the number of brands of JATO is similar, which can be regarded as Chang’an’s “top out†of Baojun in the top 25 through commercial vehicles. Rankings. "One sentence comment" also established a measure of the dimension: the average ranking. That is, the ranking average of a department of car brands in the current year, the smaller the overall ranking is, the better. According to this line of thinking, the results of our calculations show that the average ranking of Chinese brands in 2017 is 35.2, which is close to that in 2014 and not as good as in 2015 and 2016. The average ranking of 35 or so also means that Chinese brands are ranked behind on average. In turn, the average Japanese ranking has improved from about 19 in previous years to about 17; the US Department has improved from about 23 to 21, and the German system has improved from about 14 to about 13. Although the Korean Department is fluctuating, the average ranking from 6 to 7 is the best in each department. Even the average ranking of Indian brands in 2017 exceeded that of Chinese brands. Four-year average ranking of TOP50 brands Chinese brands have many seats, and at the same time have the dual meaning of comfort and sadness. This is a kind of frustrating pride. There are both positive and negative results. In 2018, China's auto market will not be peaceful. CAAC and other agencies have already given 3% increase in commercial vehicles and passenger cars. Some of them even believe that passenger cars will experience a rare negative growth. For joint venture brands and independent brands, the pressure is obvious. It is not difficult to predict that with the Matthew's reshuffle, Chinese brands will intensify the trend of “stronger and weaker players are eliminatedâ€. In the end, perhaps the number of Chinese brands on the TOP50 list will not grow, but the ranking Total sales will leap forward significantly, and that's when we can really be proud. The so-called aligning bearing is that the raceway raceway is spherical, and it can adapt to the angular displacement between the two raceways, which is mainly supported by radial load, and can also bear a small number of two-way axial loads.
Tune ball bearing editing
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Characteristics of core bearing
It is mainly subjected to radial load, and it can also bear a small amount of bidirectional axial load.
The center ball bearing is the inner ring of the two raceways and the outer ring of the raceway for the spherical surface, and the ball bearing is assembled with a ball shaped roller. It can bear a large radial load and also bear a certain axial load, as shown in Figure 1. The outer raceway of this kind of bearing is spherical, so it has the performance of adjusting center.
The main features of the ball bearing are as follows:
(1) the outer race raceway of the ball aligning ball bearing is a part of the sphere. The center of curvature is on the bearing axis. Therefore, the bearing has the function of adjusting the center, and it can be automatically adjusted when the shaft and shell appear flexure, and does not increase the bearing burden.
(2) an appropriate amount of axial load that can bear radial load and two directions. But it can't bear the torque load.
This kind of bearing has smaller contact angle, almost no contact angle under axial load, small axial load capacity, large radial load capacity, and suitable for heavy load and impact load.
(3) the double row center ball bearing with tightened and locking nuts can be installed at any position on the optical axis and does not need to be positioned on the shoulder.
Spherical Roller Bearing is in the two groove of the inner ring and outer ring raceways between Spherical Bearing assembly, a drum shaped roller, as shown in figure 3. Spherical Roller Bearing with two rollers, mainly bear radial load, also can withstand any direction of the amount of axial load; radial load capacity is very high, especially suitable for radial heavy loads or vibration, but unable to bear pure axial load.
The main characteristics of the spherical roller bearing:
(1) bearing with self-aligning ball like outer ring spherical roller bearing raceway is a part of spherical surface, the curvature center on the bearing axis, the bearing outer ring raceway is spherical shape, so its self-aligning performance is good, can compensate concentricity error, thus can realize the automatic aligning.
(2) in the section perpendicular to the rolling direction, the roller busbar is a curve, which fits well with the inside and outside raceway. The roller and raceway are linear contacts, which can bear radial load and axial load, and has good impact resistance.
(3) roller and roller bearing raceway match well, and are therefore relatively serious curve generatrix, sliding, friction than cylindrical roller bearings, spherical roller bearings are allowed so low working speed.
(4) the heart fades with a normal roller bearing non symmetrical roller, it will generate an axial force, roller by the force and the center fixed flange contact, spherical roller bearing symmetrical roller, it can move along the axial direction using the middle movable baffle ring, so no longer block roller center the edge of the constraints, and saves the recess of the inner raceway, the roller can be used longer, so as to improve the bearing capacity.
(5) single row self-aligning roller bearing contact angle is 0. Under axial load, the contact angle did not change significantly, the axial load will be very small contact forces generated great between roller and raceway, so when the axial load is greater than the radial load, the loads of single row spherical roller bearing can bear radial and axial.
(6) bearing with self-aligning ball like set with tight double row spherical roller bearing can be installed in any position on the optical axis, do not need to process the positioning shaft shoulder.
