SANWA TEKKI CORPORATION

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ShinkansenAutomatic Tension Balancers

Spring-type balancer: Model NS

Model NS balancers are smaller and lighter balancers that are made by using a high-stress spring material to reduce spring diameters. Their two-tier springs make it possible for them to have long-stroke responses. Accordingly, Model NS balancers can cope with the tension and strokes that occur in almost all types of overhead contact line systems.

Major specifications

ModelStandard tensionTensile change rateStroke(mm)
NS100-19.82kN (1000kgf)Less than ±15%470 (±235)
NS100-2590 (±295)
NS100-3710 (±355)
NS150-114.7kN (1500kgf)Less than ±15%420 (±210)
NS150-2560 (±280)
NS150-3700 (±355)
NS200-119.6kN (2000kgf)Less than ±15%500 (±250)
NS200-2630 (±315)
NS200-3760 (±380)
NS250-124.5kN (2500kgf)Less than ±15%240 (±120)
NS250-2360 (±180)
NS250-3480 (±240)
NS300-129.4kN (3000kgf)Less than ±15%390 (±195)
NS300-2530 (±265)
NS300-3660 (±330)
NS400-239.2kN (4000kgf)Less than ±15%650 (±325)
NS400-3790 (±395)

Spring-type balancer: Model NSS

Model NSS balancers are spring-type tension balancers that are used for the Tohoku, Joetsu, and Kyushu Shinkansen. Their three-tier springs make it possible for them to cope with the expansion and contraction of overhead contact lines at a tensile change rate of less than ±9% (for an overhead contact line length of 800 m). Use of a high-tensile steel material as spring steel enabled us to reduce the balancer size to its limit. Model NSS balancers are classified into two types. One type is for a tension of 39.2 kN (4000 kgf) as seen in the photograph, and the other type is for a tension of 24.5 kN (2500 kgf).

Major specifications

ModelStandard tensionTensile change rateStroke(mm)
NSS250-124.5 kN (2500 kgf)Less than ±9%250 (±125)
NSS250-2380 (±190)
NSS250-3510 (±255)
NSS400-139.2 kN (4000 kgf)Less than ±9%380 (±190)
NSS400-2510 (±255)
NSS400-3640 (±320)

Pulley-type balancer

滑車式 在来線用Pulley-type balancers exhibit a tensile change rate of approximately 5%, which is lower than that of spring-type balancers. They are capable of handling large expansions and contractions (for an overhead contact line length of 800 m). In addition to the new No. 2 balancer seen in the photograph (29.4 kN (3000 kgf) or lower), the No. 3 balancer (53.7 kN (5500 kgf) or lower) and others are also available.

Main specifications of the product shown in the photograph

ModelModel II (new)
Standard tension29.4kN (3000kgf)
Tension change rateUp to ±5%
Stroke800mm

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