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Article type: Cover
1928 Volume 31 Issue 139 Pages
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Published: November 20, 1928
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Article type: Appendix
1928 Volume 31 Issue 139 Pages
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Hideo SHIMA
Article type: Article
1928 Volume 31 Issue 139 Pages
969-984
Published: November 20, 1928
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The empirical formulae proposed by various authors for estimating the amount of tractive force of railway steam locomotives afford very often the results remarkably different from each other. Dr.K.Asakura, C.M.E of the rolling stock section of the J.G.R., pointed out that the diversity arises principally from the too simple and liberal idea that the resistance of railway locomotives may be assumed directly proportional to their weights. He recommended a new method of calculation based on his original principle which holds fairly good for the most of various test-results and has been adopted since by the majority of engineers of the J.G.R. However, as the method requires a series of complicated calculations he also recommended the use of a set of charts prepared from the data which he had at hand at that time. The object of this paper is to recommend another set of new charts which are believed to be simpler in use and closer in result inaccordance with the characteristics of the modern locomotives fitted with superheaters as well as feedwater-heaters and working at higher steam pressure. 1. By assuming the rate of combustion (B) and computing the principal dimensions of the locomotive we find Q_<max>/NJP, ratio of the maximum evaporative power of the boiler to the product of the total piston displacement into the boiler pressure.(Fig. 8). 2. The ratio of the mean effective pressure to the boiler pressure multiplied by the mechanical efficiency of the steam engine (yη) is to be found corresponding to Q_<max>/NJP and n, the r.p.m. of the driving wheels (Fig. 9.) 3. The tractive force at the driving wheel tread (Z) is to be found by calculating graphically (Fig. 9) the following formula, where D is the diameter of the driving wheel. Z=y.η. 20 NJP/πD 4. The tractive force at the drawbar will be got by subtracting the running resistance corresponding to the speed from the value of Z.
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Hisashi IMAIZUMI
Article type: Article
1928 Volume 31 Issue 139 Pages
985-1008
Published: November 20, 1928
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Express passenger locomotives, type EF 52,for Tokaido main line are designed by the Government Railways in co-operation with principal makers in Japan, and recently were manufactured by those makers. General descriptions of the locomotive are as follows : [table] In this paper the writer treats general characteristics and constructions of this locomotive.
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Kiichi ASAKURA
Article type: Article
1928 Volume 31 Issue 139 Pages
1009-1024
Published: November 20, 1928
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Owing to the competition between the automobile and the railway, the frequent service of the railway trains has become very important, and for this reason, the gasoline engine is now much used for the railway motor car. The Government Railways are now making 4-wheeled motor cars having 40 H.P. engine, which are to be assigned to the remote district. The Diesel engine is gradually applied to the locomotive. The Government Railways have placed an order of two Diesel locomotives to German makers. The Diesel engine for the locomotive use must be light but solid. The weight of 20 kg/H.P. may be considered as available. The electric transmission gear may be considered as the most convenient and applicable to the big power locomotive. The Diesel locomotive which may be substituted for the present biggest steam or electric locomotive of the Government Railways, must have 1500 H.P. Diesel engine and may weigh 150 tons. However its design is very difficult and moreover it is very hard to use such locomotive due to the economic point of view, because it will be of very high price.
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[in Japanese]
Article type: Article
1928 Volume 31 Issue 139 Pages
321-323
Published: November 20, 1928
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[in Japanese]
Article type: Article
1928 Volume 31 Issue 139 Pages
323-327
Published: November 20, 1928
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[in Japanese]
Article type: Article
1928 Volume 31 Issue 139 Pages
327-328
Published: November 20, 1928
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[in Japanese]
Article type: Article
1928 Volume 31 Issue 139 Pages
328-330
Published: November 20, 1928
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[in Japanese]
Article type: Article
1928 Volume 31 Issue 139 Pages
330-331
Published: November 20, 1928
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[in Japanese]
Article type: Article
1928 Volume 31 Issue 139 Pages
331-332
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Article type: Article
1928 Volume 31 Issue 139 Pages
332-334
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Article type: Article
1928 Volume 31 Issue 139 Pages
334-335
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[in Japanese]
Article type: Article
1928 Volume 31 Issue 139 Pages
335-338
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[in Japanese]
Article type: Article
1928 Volume 31 Issue 139 Pages
338-342
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Article type: Article
1928 Volume 31 Issue 139 Pages
342-343
Published: November 20, 1928
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Article type: Article
1928 Volume 31 Issue 139 Pages
343-344
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Article type: Article
1928 Volume 31 Issue 139 Pages
344-347
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Article type: Article
1928 Volume 31 Issue 139 Pages
347-351
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Article type: Article
1928 Volume 31 Issue 139 Pages
351-354
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1928 Volume 31 Issue 139 Pages
355-357
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Article type: Article
1928 Volume 31 Issue 139 Pages
357-358
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Article type: Article
1928 Volume 31 Issue 139 Pages
358-359
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Article type: Article
1928 Volume 31 Issue 139 Pages
359-360
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Article type: Article
1928 Volume 31 Issue 139 Pages
360-361
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Article type: Article
1928 Volume 31 Issue 139 Pages
361-362
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1928 Volume 31 Issue 139 Pages
362-367
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Article type: Article
1928 Volume 31 Issue 139 Pages
367-370
Published: November 20, 1928
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Article type: Appendix
1928 Volume 31 Issue 139 Pages
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Published: November 20, 1928
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Article type: Cover
1928 Volume 31 Issue 139 Pages
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Published: November 20, 1928
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Article type: Cover
1928 Volume 31 Issue 139 Pages
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Published: November 20, 1928
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