XX型自卸車制動比例閥設(shè)計(畢業(yè)設(shè)計)
13000字    26頁

摘    要

眾所周知，汽車制動時，如果前輪先抱死，汽車將失去轉(zhuǎn)向控制能力，但尚處于在穩(wěn)定狀態(tài)，如果后軸先抱死，則有可能發(fā)生后軸側(cè)滑甚至急轉(zhuǎn)，使汽車失去控制，此時汽車處于非穩(wěn)定狀態(tài)，易發(fā)生交通事故。在汽車撞車事故中，以車輪在制動情況下抱死而引起的制動距離增加.跑偏和側(cè)滑所引起的事故占比例最高，轎車為49.5%。輕型客貨車為52.3%。為了保證汽車行駛安全，提高運輸效率，世界各國都在制定或補充修訂制動法規(guī)。例如，瑞典F18法規(guī)規(guī)定:在各種載荷下，在附著系數(shù)為0. 8的道路上，在低于規(guī)定的制動效能下，不能有一個車輪抱死。對總質(zhì)量小于3t的汽車，在減涼度為o. 8 ~ 8. 0m /s2之間時，不允許后輪先抱死【1】。
因此加裝制動里調(diào)節(jié)裝置以防止后輪先于前輪抱死對汽車的安全性能有極其重要的意義。CBW3102B型自卸汽車是在原農(nóng)用車基礎(chǔ)上改裝的，沒有加裝制動力調(diào)節(jié)裝置，這對其制動的安全性和制動效率產(chǎn)生了巨大影響。為了提高其制動安全性和制動效率，本文擬設(shè)計一種比例閥以改善其制動安全性和制動效率。
本文是通過對該車制動力的分配計算，比較了各種比例閥的優(yōu)缺點后確定并設(shè)計了一種慣性比例閥作為該車的制動力調(diào)節(jié)裝置的。

關(guān)鍵詞：防止后輪先抱死，制動力分配，計算，設(shè)計，慣性比例閥

ABSTRACT

As well as we know, while a vehicle brake, if the front wheels are locked further than the rear wheels, the vehicle will hold out to control, but he still is in stable condition; if the rear wheels are locked further than the front wheels, there may occur sideslip, even sharp turn, the vehicle is in unstable condition, it’s easy to occur an accident. In the vehicle accidents, the locking of the wheels when the vehicle is braking leads to the braking distance increase sideslip and sharp turn takes the highest proportion, car for 49.5%, light bus or vehicle for 52.3%. In order to ensure the safety of the vehicle, and improve the efficiency，all countries of the world formulated or revised brake rules and regulations. For example, the Swedish F18 regulations in various loads in a devil of 0.8 roads, below the prescribed work efficiency, can't have a locking of the wheels. For the all quality of the vehicle less than 3t, the deceleration is between o. 8 ~ 8. 0m /s2, the rear wheels locked first are not allowed.
So, it’s very important to put a braking force distribution device on the vehicle to avoid the rear wheels locked further than the front wheels. CBW3102 dumper truck is changed by the farm vehicle, hasn’t any braking force distribution device, this effect the   braking security and efficiency. So, in order to improve the braking security and efficiency this text design a proportion valve to improve the braking security and efficiency.
This text through counting the vehicle’s braking force distribution, and compare many valves’ good and bad efficiency , then decide to design the inertia proportion valve is good for this truck.

Key words：Avoid the rear wheels locked further, braking force distribution, count, design, inertia proportion valve

 
目錄
中文摘要 Ⅰ
ABSTRACT Ⅱ
1緒論 1
1.1 概述 1
1.2 汽車制動力裝置的發(fā)展歷史 2
1.3課題研究的意義 3
1.4主要研究內(nèi)容 4
2汽車前后制動力分配分析 5
2.1對該車基本數(shù)據(jù)進行分析 5
2.2比例系數(shù)C值的計算 5
2.3對該車進行理想制動力分配計算 7
3對該車應(yīng)采用的實際制動力分配進行討論分析……………………………10
3.1對該車應(yīng)采用的制動力調(diào)節(jié)裝置的選擇 10
3.1.1限壓閥 10
3.1.2比例閥 10
3.1.3感載比例閥 11
3.1.4慣性比例閥 11
3.2慣性比例閥的實際制動力分配討論分析 12
4.慣性比例閥的設(shè)計 16
4.1慣性比例閥參數(shù)計算 16
4.2慣性比例閥尺寸參數(shù)的設(shè)計 17
4.3慣性比例閥的結(jié)構(gòu)設(shè)計 18
5.結(jié)束語 21
參考文獻 22