為什麼四門轎車都不做後面雨刷 - 轎車
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By Ursula
at 2018-01-08T02:30
at 2018-01-08T02:30
Table of Contents
這之前好像討論過了? 不過趁機再寫詳細點
以車商的立場
雨刷是能不裝就不裝,不裝可以省成本、省重量、省開關控制器線路馬達、提高妥善率
所以裝雨刷是被迫的
要問的問題是為什麼5門大多數都被迫要做後雨刷?是要解決什麼問題?
直接的問題是5門車款的後擋風玻璃太容易被泥水噴髒
必須裝雨刷來解決
後擋風玻璃不是說下雨就會髒,這牽涉到泥土沉積的機制
可以看以下影片模擬車輛的泥水沉積:
https://www.youtube.com/watch?v=o1Dg8juCYfo
車輛行進時,由於壓差會產生尾流區(wake region, 若有更好譯法請告知)
尾流區的空氣會被捲起迴流,表面流速慢,泥水會在這個區域內沉積
尾流區不只發生在車尾,還會發生在輪子和後照鏡後方
尾流不只會捲空氣,還會包含雨水、泥水、雪水、塵土等等
基本上有什麼捲什麼
如果只有捲到雨水,那就不太會髒,例如後照鏡的尾流區沒什麼髒汙問題
但如果捲到塵土、雪水或泥水就會很髒,例如輪子的尾流區就會充滿髒汙
前輪尾流區造成輪拱和前後車門髒汙
後輪尾流區造成後葉子板和車輛後部髒汙
現在來講4門和5門的區別(可以配下圖)
http://www.exa.com/en/industry/automotive
5門車因為造型因素,整個車子後方是一個大的尾流區
http://www.exa.com/sites/default/files/media-module/e39touring.gif
他勢必會跟後輪的尾流區合流
後輪捲起的泥水塵土很容易被捲上後檔玻璃造成髒汙
逼不得已只好裝雨刷來清潔
四門車因為造型關係,有可能後擋和後車廂有兩個分開的尾流區
http://www.exa.com/sites/default/files/media-module/e39limousine.gif
後輪尾流區只和後車廂尾流區合流,沒有流到後檔玻璃的尾流區
髒只髒到後車廂,後檔玻璃就沒有泥土問題
如果造型設計得更流線,也有可能後檔完全沒有尾流區,尾流區只產生在後車廂後方
這樣更沒問題,在尾流區以外的車窗受到的風速很大,雨水會直接被吹走
大概是這樣,不過5門4門只是個分類,
空氣動力上沒有說5門一定怎樣怎樣4門一定怎樣怎樣,也有4門尾流很大的
總之,是車商依據測試出來的結果決定能不能不裝雨刷
※ 引述《dog9527 (致命病毒)》之銘言:
: 如題
: 我覺得後面雨刷很方便
: 而且四門做的話也沒衝突
: 每次下雨上面有雨水真的很影響視野
: 晚上加雨天真的視線不佳
: 為什麼四門都不做後雨刷呀?
--
以車商的立場
雨刷是能不裝就不裝,不裝可以省成本、省重量、省開關控制器線路馬達、提高妥善率
所以裝雨刷是被迫的
要問的問題是為什麼5門大多數都被迫要做後雨刷?是要解決什麼問題?
直接的問題是5門車款的後擋風玻璃太容易被泥水噴髒
必須裝雨刷來解決
後擋風玻璃不是說下雨就會髒,這牽涉到泥土沉積的機制
可以看以下影片模擬車輛的泥水沉積:
https://www.youtube.com/watch?v=o1Dg8juCYfo
車輛行進時,由於壓差會產生尾流區(wake region, 若有更好譯法請告知)
尾流區的空氣會被捲起迴流,表面流速慢,泥水會在這個區域內沉積
尾流區不只發生在車尾,還會發生在輪子和後照鏡後方
尾流不只會捲空氣,還會包含雨水、泥水、雪水、塵土等等
基本上有什麼捲什麼
如果只有捲到雨水,那就不太會髒,例如後照鏡的尾流區沒什麼髒汙問題
但如果捲到塵土、雪水或泥水就會很髒,例如輪子的尾流區就會充滿髒汙
前輪尾流區造成輪拱和前後車門髒汙
後輪尾流區造成後葉子板和車輛後部髒汙
現在來講4門和5門的區別(可以配下圖)
http://www.exa.com/en/industry/automotive
5門車因為造型因素,整個車子後方是一個大的尾流區
http://www.exa.com/sites/default/files/media-module/e39touring.gif

他勢必會跟後輪的尾流區合流
後輪捲起的泥水塵土很容易被捲上後檔玻璃造成髒汙
逼不得已只好裝雨刷來清潔
四門車因為造型關係,有可能後擋和後車廂有兩個分開的尾流區
http://www.exa.com/sites/default/files/media-module/e39limousine.gif

後輪尾流區只和後車廂尾流區合流,沒有流到後檔玻璃的尾流區
髒只髒到後車廂,後檔玻璃就沒有泥土問題
如果造型設計得更流線,也有可能後檔完全沒有尾流區,尾流區只產生在後車廂後方
這樣更沒問題,在尾流區以外的車窗受到的風速很大,雨水會直接被吹走
大概是這樣,不過5門4門只是個分類,
空氣動力上沒有說5門一定怎樣怎樣4門一定怎樣怎樣,也有4門尾流很大的
總之,是車商依據測試出來的結果決定能不能不裝雨刷
※ 引述《dog9527 (致命病毒)》之銘言:
: 如題
: 我覺得後面雨刷很方便
: 而且四門做的話也沒衝突
: 每次下雨上面有雨水真的很影響視野
: 晚上加雨天真的視線不佳
: 為什麼四門都不做後雨刷呀?
--
Tags:
轎車
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
By Necoo
at 2018-05-20T12:38
at 2018-05-20T12:38

By Jacob
at 2018-05-24T17:47
at 2018-05-24T17:47

By Frederic
at 2018-05-25T11:38
at 2018-05-25T11:38

By Freda
at 2018-05-26T16:38
at 2018-05-26T16:38

By Hedwig
at 2018-05-30T01:13
at 2018-05-30T01:13

By Madame
at 2018-06-02T06:27
at 2018-06-02T06:27

By Frederic
at 2018-06-06T09:59
at 2018-06-06T09:59

By Christine
at 2018-06-07T13:45
at 2018-06-07T13:45

By Tom
at 2018-06-12T00:14
at 2018-06-12T00:14

By Barb Cronin
at 2018-06-15T18:57
at 2018-06-15T18:57

By Brianna
at 2018-06-19T04:51
at 2018-06-19T04:51

By Wallis
at 2018-06-22T03:16
at 2018-06-22T03:16

By John
at 2018-06-24T19:37
at 2018-06-24T19:37

By Rosalind
at 2018-06-27T17:38
at 2018-06-27T17:38

By Wallis
at 2018-06-30T21:11
at 2018-06-30T21:11

By Audriana
at 2018-07-01T00:50
at 2018-07-01T00:50

By Candice
at 2018-07-04T07:47
at 2018-07-04T07:47

By Thomas
at 2018-07-05T16:06
at 2018-07-05T16:06

By Quanna
at 2018-07-09T04:44
at 2018-07-09T04:44

By Ivy
at 2018-07-10T18:37
at 2018-07-10T18:37

By Kama
at 2018-07-13T06:29
at 2018-07-13T06:29

By Anthony
at 2018-07-16T14:21
at 2018-07-16T14:21

By Adele
at 2018-07-17T09:56
at 2018-07-17T09:56

By Mia
at 2018-07-20T08:42
at 2018-07-20T08:42

By Barb Cronin
at 2018-07-23T01:01
at 2018-07-23T01:01

By Enid
at 2018-07-27T04:26
at 2018-07-27T04:26

By Edith
at 2018-07-27T07:07
at 2018-07-27T07:07

By Delia
at 2018-07-30T06:00
at 2018-07-30T06:00

By Hamiltion
at 2018-08-03T08:53
at 2018-08-03T08:53

By Kumar
at 2018-08-03T13:20
at 2018-08-03T13:20

By Annie
at 2018-08-04T19:07
at 2018-08-04T19:07

By Skylar Davis
at 2018-08-09T13:49
at 2018-08-09T13:49

By Noah
at 2018-08-10T11:50
at 2018-08-10T11:50

By Elma
at 2018-08-14T16:25
at 2018-08-14T16:25

By Belly
at 2018-08-16T00:25
at 2018-08-16T00:25

By Dora
at 2018-08-19T11:12
at 2018-08-19T11:12

By Charlotte
at 2018-08-20T15:10
at 2018-08-20T15:10

By Hedda
at 2018-08-25T00:07
at 2018-08-25T00:07

By Agatha
at 2018-08-25T06:46
at 2018-08-25T06:46

By Kumar
at 2018-08-27T01:06
at 2018-08-27T01:06

By Zanna
at 2018-08-30T12:50
at 2018-08-30T12:50

By Dinah
at 2018-09-02T06:42
at 2018-09-02T06:42

By Daniel
at 2018-09-07T02:41
at 2018-09-07T02:41

By Ida
at 2018-09-09T20:34
at 2018-09-09T20:34

By Susan
at 2018-09-10T16:10
at 2018-09-10T16:10

By Sarah
at 2018-09-15T14:37
at 2018-09-15T14:37

By Necoo
at 2018-09-20T07:10
at 2018-09-20T07:10

By Gilbert
at 2018-09-22T05:47
at 2018-09-22T05:47

By Rebecca
at 2018-09-25T06:21
at 2018-09-25T06:21

By Anthony
at 2018-09-29T14:43
at 2018-09-29T14:43

By Yuri
at 2018-09-30T11:30
at 2018-09-30T11:30

By Lauren
at 2018-10-02T15:14
at 2018-10-02T15:14

By Connor
at 2018-10-06T13:02
at 2018-10-06T13:02

By Blanche
at 2018-10-10T17:54
at 2018-10-10T17:54

By Adele
at 2018-10-14T19:53
at 2018-10-14T19:53

By Agnes
at 2018-10-15T06:29
at 2018-10-15T06:29

By Una
at 2018-10-17T22:01
at 2018-10-17T22:01

By Jake
at 2018-10-18T06:01
at 2018-10-18T06:01

By Faithe
at 2018-10-22T06:27
at 2018-10-22T06:27

By Adele
at 2018-10-25T18:16
at 2018-10-25T18:16

By Caroline
at 2018-10-28T01:41
at 2018-10-28T01:41

By Hedy
at 2018-10-28T03:13
at 2018-10-28T03:13

By John
at 2018-10-28T22:03
at 2018-10-28T22:03

By Kelly
at 2018-10-31T17:24
at 2018-10-31T17:24

By Leila
at 2018-11-04T11:03
at 2018-11-04T11:03

By Irma
at 2018-11-05T06:23
at 2018-11-05T06:23

By Quintina
at 2018-11-08T09:07
at 2018-11-08T09:07

By Eartha
at 2018-11-12T05:07
at 2018-11-12T05:07

By Agatha
at 2018-11-13T03:14
at 2018-11-13T03:14

By Charlie
at 2018-11-14T10:41
at 2018-11-14T10:41

By Emily
at 2018-11-17T06:25
at 2018-11-17T06:25

By Poppy
at 2018-11-18T22:46
at 2018-11-18T22:46

By Yuri
at 2018-11-20T03:47
at 2018-11-20T03:47

By Ula
at 2018-11-22T14:03
at 2018-11-22T14:03

By Thomas
at 2018-11-24T20:10
at 2018-11-24T20:10

By Isabella
at 2018-11-29T03:49
at 2018-11-29T03:49

By Jessica
at 2018-11-30T14:39
at 2018-11-30T14:39

By Valerie
at 2018-12-02T17:26
at 2018-12-02T17:26

By Ophelia
at 2018-12-04T07:11
at 2018-12-04T07:11

By Robert
at 2018-12-08T09:38
at 2018-12-08T09:38

By Ethan
at 2018-12-10T15:46
at 2018-12-10T15:46

By Franklin
at 2018-12-14T06:50
at 2018-12-14T06:50

By Belly
at 2018-12-15T14:40
at 2018-12-15T14:40

By Candice
at 2018-12-19T11:31
at 2018-12-19T11:31

By Thomas
at 2018-12-20T15:43
at 2018-12-20T15:43

By Puput
at 2018-12-21T22:40
at 2018-12-21T22:40

By Yedda
at 2018-12-24T11:42
at 2018-12-24T11:42

By Jacob
at 2018-12-29T02:01
at 2018-12-29T02:01
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By Caroline
at 2019-01-02T11:22
at 2019-01-02T11:22
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By Olga
at 2019-01-04T09:53
at 2019-01-04T09:53
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By Michael
at 2019-01-06T09:28
at 2019-01-06T09:28
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By Mary
at 2019-01-10T08:43
at 2019-01-10T08:43
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By Linda
at 2019-01-14T21:15
at 2019-01-14T21:15
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By Andy
at 2019-01-16T00:02
at 2019-01-16T00:02
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By Ivy
at 2019-01-19T08:00
at 2019-01-19T08:00
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By Elvira
at 2019-01-23T21:33
at 2019-01-23T21:33
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By Hazel
at 2019-01-24T06:25
at 2019-01-24T06:25
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By Bennie
at 2019-01-27T10:24
at 2019-01-27T10:24
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By Emma
at 2019-01-28T23:03
at 2019-01-28T23:03

By Noah
at 2019-02-02T16:41
at 2019-02-02T16:41
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By Anthony
at 2019-02-06T15:03
at 2019-02-06T15:03
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By Joseph
at 2019-02-09T17:08
at 2019-02-09T17:08
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By Heather
at 2019-02-10T19:03
at 2019-02-10T19:03

By Elma
at 2019-02-10T23:32
at 2019-02-10T23:32
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By Ina
at 2019-02-12T20:51
at 2019-02-12T20:51
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By Gilbert
at 2019-02-16T12:20
at 2019-02-16T12:20
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By Ivy
at 2019-02-17T08:58
at 2019-02-17T08:58
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By Dorothy
at 2019-02-20T15:47
at 2019-02-20T15:47
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By David
at 2019-02-22T01:45
at 2019-02-22T01:45
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By Hedy
at 2019-02-24T12:39
at 2019-02-24T12:39

By Joseph
at 2019-02-26T13:08
at 2019-02-26T13:08
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By Dinah
at 2019-03-01T15:54
at 2019-03-01T15:54
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By Lucy
at 2019-03-04T07:40
at 2019-03-04T07:40
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By Tracy
at 2019-03-08T11:44
at 2019-03-08T11:44

By Edith
at 2019-03-11T14:12
at 2019-03-11T14:12

By Rosalind
at 2019-03-14T20:44
at 2019-03-14T20:44
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By Zora
at 2019-03-17T06:55
at 2019-03-17T06:55
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By Doris
at 2019-03-21T01:34
at 2019-03-21T01:34

By Todd Johnson
at 2019-03-21T12:18
at 2019-03-21T12:18

By Madame
at 2019-03-24T23:25
at 2019-03-24T23:25

By Olivia
at 2019-03-26T06:01
at 2019-03-26T06:01

By Agatha
at 2019-03-27T02:39
at 2019-03-27T02:39

By Wallis
at 2019-03-30T12:22
at 2019-03-30T12:22
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By Sarah
at 2019-03-31T20:45
at 2019-03-31T20:45
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By Ingrid
at 2019-04-04T12:42
at 2019-04-04T12:42
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By Agatha
at 2019-04-07T07:31
at 2019-04-07T07:31
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By Selena
at 2019-04-10T18:17
at 2019-04-10T18:17

By Liam
at 2019-04-13T15:28
at 2019-04-13T15:28
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By Barb Cronin
at 2019-04-15T14:19
at 2019-04-15T14:19

By Eartha
at 2019-04-19T23:44
at 2019-04-19T23:44

By Charlie
at 2019-04-24T14:28
at 2019-04-24T14:28

By Wallis
at 2019-04-27T11:25
at 2019-04-27T11:25

By Blanche
at 2019-04-30T23:52
at 2019-04-30T23:52

By Hedda
at 2019-05-02T08:08
at 2019-05-02T08:08

By Necoo
at 2019-05-04T18:45
at 2019-05-04T18:45

By Necoo
at 2019-05-05T21:17
at 2019-05-05T21:17

By James
at 2019-05-09T21:57
at 2019-05-09T21:57

By Liam
at 2019-05-11T02:51
at 2019-05-11T02:51
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By Adele
at 2019-05-14T04:31
at 2019-05-14T04:31
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By Brianna
at 2019-05-16T12:00
at 2019-05-16T12:00
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By Quintina
at 2019-05-20T14:20
at 2019-05-20T14:20
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By Kelly
at 2019-05-21T05:43
at 2019-05-21T05:43
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By Candice
at 2019-05-25T17:15
at 2019-05-25T17:15
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By Poppy
at 2019-05-27T11:25
at 2019-05-27T11:25
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By Candice
at 2019-05-29T14:09
at 2019-05-29T14:09

By Hazel
at 2019-06-03T03:14
at 2019-06-03T03:14

By Daniel
at 2019-06-04T22:26
at 2019-06-04T22:26

By Edward Lewis
at 2019-06-07T10:23
at 2019-06-07T10:23

By Gary
at 2019-06-12T03:11
at 2019-06-12T03:11

By Jacob
at 2019-06-14T09:56
at 2019-06-14T09:56

By Zanna
at 2019-06-16T17:37
at 2019-06-16T17:37

By Olive
at 2019-06-16T19:30
at 2019-06-16T19:30

By Eartha
at 2019-06-19T19:41
at 2019-06-19T19:41

By Ophelia
at 2019-06-20T19:19
at 2019-06-20T19:19

By Mary
at 2019-06-21T11:43
at 2019-06-21T11:43
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