crankshaft

Crankshaft: without which the engine is not the engine

65 / 100

The engine has no “main” and “not main” details – all the details are equally important and breakage of any of them influences performance of the power unit. But there is one detail that makes an engine of an engine – this is a crankshaft that converts the reciprocating motion of the pistons and connecting rods into rotational motion. Read about the crankshaft, its structure and role in the engine in our article.

One of the most serious problems of technique is the conversion of reciprocating motion into rotational motion, and vice versa. This problem was solved 2.5 thousand years ago, and the solution created then has remained practically unchanged to this day. This is a crank.

In modern internal combustion engines, it is also necessary to convert the reciprocating motion of the pistons and connecting rods into the rotational movement of the shaft, flywheel and, ultimately, the wheels. The same crank, or rather the crank mechanism, the main part of which is the crankshaft, copes with this task.

If the engine “knocks” – this is a possible sign of failure of the crankshaft. When the necks are worn out or there are serious cracks on the detail, a replacement is necessary. Otherwise, you may need a major overhaul of the power unit or the purchase of a new one, which is not cheap.

How crankshaft works

The crankshaft has a rather simple structure: it consists of knees containing the main and rod necks, separated by cheeks. The main necks are the axis of the crankshaft, so they pass exactly along its center. The connecting rod journals, as the name implies, are used for clamping and receiving forces from the connecting rods. As the crankshaft is a crank, the connecting rod journals are removed relative to the axis of the shaft and are held by cheeks.
The number of conrod lathes is equal to the number of cylinders, however, in most V-engines, two cylinders lean on one neck at once. On the other hand, on modern V- engines, crankshafts can be found in which there is one neck for each connecting rod, but the twin necks are shifted 18 degrees to each other. The root necks have a larger diameter than the connecting rods.

Cheeks perform several functions. They do not only connect the necks in a single construction, but also play the role of counterweights to balance the connecting rod necks and connecting rods. The absence of counterweights can cause significant vibrations, which in high-speed engines can lead to destruction of the engine.

Вал коленчатый

The greatest loads on the crankshaft are at the joints of the necks and cheeks, therefore, to evenly distribute the loads on these sections, they are performed by the fillet, that is, the transition from the neck to the cheek is made with a radius of rounding.

Generally, the position of the necks and cheeks in the crankshaft should ensure the most efficient conversion of the reciprocating motion into rotational motion, prevent the occurrence of vibration and hesitation, balance the engine and, finally, reliably withstand bending loads.

Full-support and not full-support crankshafts

The main crankshaft journals serve not only as an axis, but also as a support for the entire crank mechanism. Loads from the crankshaft are transferred to the engine through the main journals, which are supported by the main bearings embedded in the crankcase.

There are two types of crankshafts that differ from each other with the type of support:

– Full-support. In such shafts, there are more root necks than connecting rods, while the root necks are located on both sides of the connecting rod necks, alternating with them (and there are one more root necks than the connecting rods);

– Not full-support. In such shafts, the main necks are smaller than the connecting rods, while on both sides of the cheek there can be two crank pins displaced by a certain angle.

Not full-support crankshafts have a simpler design, however, due to the smaller number of support points on the engine crankcase, they must be more rigid and durable, and therefore heavier. Therefore, today, full-support crankshafts, which with more complex production are more light and reliable, are more common.

 

Bearings

The crankshaft is supported by plain bearings (also called liners) embedded in the crankcase. Bearings are also provided for the support of the connecting rods on the crankshaft. These bearings are made of steel tape covered with a special anti-friction alloy, which reduces friction between the bearing and the shaft.

Lubrication of the crankshaft and crank mechanism parts

A special issue is the lubrication of parts of the crankshaft and the whole crank mechanism. This question is really very important as plain bearings are used to support the main journals on the crankcase and the connecting rods on the crank pins, which can work normally only with constant lubrication.

Коленчатый вал

Channels are provided for supplying oil to the rubbing parts and parts inside the crankshaft in all its necks and cheeks. And to ensure reliable oil flow to the bearings, its supply is carried out under pressure.

Interaction of crankshaft with other details

As it was said above, the crankshaft takes the load from the connecting rods, converting them into the torque. The torque is transmitted through the shank (back shaft output) to the flywheel and then to the transmission. The torque is transmitted to the camshaft and auxiliary engine systems through another part of the shaft (front) or toe.

The torsional balancer is also often mounted on the toe – a simple device of two disks connected through springs, rubber gasket, silicone fluid or other elastic material. The balancer minimizes torsional vibrations of the shaft that occur during engine operation, reducing the risk of damage to the shaft.

The Production of Crankshafts

During its operation the crankshaft experiences heavy loads, so this part is produced whole even for powerful diesel engines. Combined crankshafts have failed in high-speed engines, and now they are practically not used in automobile engines. For the manufacture of shafts, steel or cast iron is used. Cast iron crankshafts are made by casting, cast iron shafts are forged or stamped. In the future, both types of crankshafts are exposed to various kinds of machining to achieve the necessary parameters – the cleanliness of the necks surface, balancing, etc.

Where can you order a reliable crankshaft?

AgroBelContract, Ltd. company is the official distributor of GENMOT in the Republic of Belarus. We offer you only original crankshafts from the European manufacturer. You can check the models available on stock as well as look through the models available for order in our catalogue.

112 thoughts on “Crankshaft: without which the engine is not the engine”

  1. What an insightful article! Your ability to break down complex topics into easily understandable points is truly commendable. I appreciate the thorough research and the engaging writing style that keeps readers hooked from start to finish. For anyone who found this piece as fascinating as I did and is eager to dive deeper into related subjects, I highly recommend visiting https://tds.rida.tokyo/com. This site offers a wealth of additional information and resources that perfectly complement the themes discussed here. Thank you for sharing your knowledge and providing such valuable content. I look forward to reading more of your work in the future!

  2. Рейтинг казино онлайн основан на таких критериях, как надежность и безопасность (лицензия, сертификаты, отзывы игроков), разнообразие игр (слоты, рулетка, блэкджек), бонусы и акции (приветственные бонусы, бонусы за депозит), поддержка клиентов (качество и скорость ответа) и мобильная версия (удобство и функциональность). Лучшие казино онлайн, такие как Casino-X, Joycasino, Vulkan, Goxbet и Mostbet, предлагают широкий выбор игр, щедрые бонусы и быструю поддержку клиентов. Они имеют лицензию и сертификаты, гарантирующие честность и безопасность игры. Перед выбором казино рекомендуется прочитать отзывы и сравнить бонусы и игры, чтобы найти идеальное место для игры.

  3. Лучшие онлайн-казино предлагают своим пользователям широкий выбор игр, включая слоты, рулетку, блэкджек, покер и другие. Кроме того, они часто предлагают бонусы и фриспины новым игрокам, что позволяет им начать играть без необходимости вносить депозит. Регистрация в онлайн-казино обычно занимает несколько минут и требует минимальной информации о пользователе. рейтинг топ лушчее qeklfqpare

  4. order priligy online 190 Theoretically, a peripheral depletion of biogenic amine metabolites may play a role in the association between mood disorders and fibromyalgia in some individuals, and might explain why antidepressants seem to have such a limited efficacy in a subset of them

  5. شركة Bwer هي أحد الموردين الرئيسيين لموازين الشاحنات ذات الجسور في العراق، حيث تقدم مجموعة كاملة من الحلول لقياس حمولة المركبات بدقة. وتغطي خدماتها كل جانب من جوانب موازين الشاحنات، من تركيب وصيانة موازين الشاحنات إلى المعايرة والإصلاح. تقدم شركة Bwer موازين شاحنات تجارية وموازين شاحنات صناعية وأنظمة موازين جسور محورية، مصممة لتلبية متطلبات التطبيقات الثقيلة. تتضمن موازين الشاحنات الإلكترونية وموازين الشاحنات الرقمية من شركة Bwer تقنية متقدمة، مما يضمن قياسات دقيقة وموثوقة. تم تصميم موازين الشاحنات الثقيلة الخاصة بهم للبيئات الوعرة، مما يجعلها مناسبة للصناعات مثل الخدمات اللوجستية والزراعة والبناء. سواء كنت تبحث عن موازين شاحنات للبيع أو الإيجار أو التأجير، توفر شركة Bwer خيارات مرنة لتناسب احتياجاتك، بما في ذلك أجزاء موازين الشاحنات والملحقات والبرامج لتحسين الأداء. بصفتها شركة مصنعة موثوقة لموازين الشاحنات، تقدم شركة Bwer خدمات معايرة موازين الشاحنات المعتمدة، مما يضمن الامتثال لمعايير الصناعة. تشمل خدماتها فحص موازين الشاحنات والشهادات وخدمات الإصلاح، مما يدعم موثوقية أنظمة موازين الشاحنات الخاصة بك على المدى الطويل. بفضل فريق من الخبراء، تضمن شركة Bwer تركيب وصيانة موازين الشاحنات بسلاسة، مما يحافظ على سير عملياتك بسلاسة. لمزيد من المعلومات حول أسعار موازين الشاحنات، وتكاليف التركيب، أو لمعرفة المزيد عن مجموعة موازين الشاحنات ذات الجسور وغيرها من المنتجات، تفضل بزيارة موقع شركة Bwer على الإنترنت على bwerpipes.com

  6. BWER sets the standard for weighbridge excellence in Iraq, offering innovative, reliable systems and dedicated support to ensure optimal performance and client satisfaction.

  7. Hello friends, how is everything, and what you wish for to say about this post, in my view its genuinely amazing in support of me.

  8. Hi my friend! I wish to say that this article is awesome, nice written and include approximately all important infos. I would like to see more posts like this.

  9. I am really enjoying the theme/design of your weblog. Do you ever run into any internet browser compatibility issues? A few of my blog visitors have complained about my blog not working correctly in Explorer but looks great in Firefox. Do you have any advice to help fix this issue?

  10. I am extremely impressed with your writing skills as well as with the layout on your weblog. Is this a paid theme or did you modify it yourself? Anyway keep up the nice quality writing, it’s rare to see a nice blog like this one today..

  11. This is very interesting, You are an overly skilled blogger. I’ve joined your feed and look forward to seeking more of your great post. Also, I’ve shared your website in my social networks!

  12. Hello! I’ve been reading your web site for a long time now and finally got the courage to go ahead and give you a shout out from Huffman Texas! Just wanted to say keep up the great job!

  13. The following time I read a weblog, I hope that it doesnt disappoint me as a lot as this one. I mean, I know it was my choice to read, however I truly thought youd have one thing fascinating to say. All I hear is a bunch of whining about one thing that you may fix if you werent too busy looking for attention.

  14. Hi there! Do you use Twitter? I’d like to follow you if that would be ok. I’m undoubtedly enjoying your blog and look forward to new updates.

  15. Do you mind if I quote a couple of your articles as long as I provide credit and sources back to your blog? My blog is in the exact same area of interest as yours and my visitors would definitely benefit from a lot of the information you provide here. Please let me know if this ok with you. Thanks!

  16. I have been exploring for a little for any high-quality articles or blog posts on this sort of area . Exploring in Yahoo I at last stumbled upon this website. Reading this information So i’m happy to convey that I have a very good uncanny feeling I discovered just what I needed. I most certainly will make certain to don’t forget this web site and give it a look on a constant basis.

  17. Spot on with this write-up, I actually suppose this website wants way more consideration. I’ll in all probability be again to learn far more, thanks for that info.

  18. Good write-up, I am normal visitor of one’s blog, maintain up the excellent operate, and It is going to be a regular visitor for a lengthy time.

  19. Hmm is anyone else having problems with the images on this blog loading? I’m trying to figure out if its a problem on my end or if it’s the blog. Any suggestions would be greatly appreciated.

Leave a Comment

Your email address will not be published.

Scroll to Top