Research on Years and Restoration Intervals of Vehicle Reducer

Through calculations and statistical results, a preliminary conclusion can be drawn from the synthesis: For a large hump with a heavy workload, the average number of brakes per year for one section of the reducer is about 300,000 vehicles, and the maximum is 500,000 vehicles. The two-position reducer The average number of brakes per year is approximately 10,000 vehicles, with a maximum of 250,000 vehicles. The average number of brakes per year for three-position reducers is approximately 40,000 vehicles, with a maximum of 70,000 vehicles.

For small and medium hump speed reducer action will be significantly reduced. Overall machine and wearing parts, wearing parts life analysis reducer machine life three parts reducer general design life of 100,000 vehicles. According to the number of brakes per year for the above-mentioned speed reducer, it can be used for a minimum of 14 years and an average of 25 years.

In fact, except for a small number of TJY-1 and T-2, which have been used for 20 years, and TTKZ-1 (A50) has been used for more than 16 years, other retarders may be identified later (for example, TJKZ-B(50). , TJKI-D (50)), there is no long-term use of records; some simply do not meet the service life requirements (such as TJKI-C).

However, most of the three-position reducers are generally around 10-12 years old, and overhauled due to the appearance of a new type of reducer. The design life of the first and second parts reducer is 1 million vehicles (eg TJK(Y)3 a (50), 2 million vehicles (eg T suit (all 3 (50), TK4 one (50)), and 30 10,000 vehicles (eg, T not K, TJK3 B (50).) If the number of brakes per year is calculated based on the above-mentioned reducer, one part of the big hump can be used for a minimum of 2 years, 4 years and 6 years respectively (up to a maximum braking per year. 500,000 vehicles, with an average of 3.3 years, 6.7 years and 10 years (300,000 brakes per year on average).

The two parts can be used for a minimum of 4, 8 and 12 years (up to 250,000 brakes per year), with an average of 6.7 years, 13.3 years and 20 years (based on the average annual number of brakes per million vehicles). In the use of the reducer, wear parts need to be replaced frequently to ensure normal use of the reducer. However, the wear life of the wearer varies greatly and it also directly affects the performance of the reducer.

Reducer Wear Life The strength of the main components of the reducer is generally in line with the design life, except for casting and material defects. However, the failure of the reducer and the degraded performance are mostly caused by excessive wear of the wear parts. The following analyzes several wear parts that have the greatest impact on the performance of the reducer.

In addition to the brake track TJKI-c, TJKI-D using 50kg / m rail restructuring, other reducers are mostly used 60 m rail restructuring. The newly-manufactured TJK3-B50 reducer adopts a 75k-long m-steel rail system. According to the statistics, 50k stays in the brake track can wear 35 to 450,000 vehicles; 60k stay m brake track can wear 50 to 600,000 vehicles; 75k stay m brake track can wear 657,700 vehicles; in large and medium-sized Hump, using 60kg / m brake track in one or two parts available 1 to 3 years; three parts available 8 to 12 years. The 50kg/m brake track can only be used for 6 to 8 years at three locations. The overhaul period is too short and is not recommended.

The sleeper plate and rail rubber pad reducer sleeper plate withstands the impact force of the rail when the reducer is released and prevents the reducer from crawling and floating to wear on the side, and is also subject to the positive pressure of the passing vehicle when not braking. The sleepers are easier to damage than the sleepers on the positive line. In addition, the rail rubber pad of the original reducer is not easy to be replaced, and the rubber pad is not replaced after being damaged or aged, which may cause damage to the sleeper plate. After the sleeper board is damaged, due to poor repair and replacement, the reducer must often be overhauled.

Therefore, the life of the sleeper plate often determines the service life of the reducer. Ordinary sleeper plate life is generally 100,000 vehicles; wear side and sleeper slots increase iron plate sleeper plate life can reach 200,000 vehicles. If you need to increase the life of the sleeper board, you need to use a combined sleeper board, that is, wear side and sleeper groove as replaceable parts. According to the calculation and analysis of the combined sleeper plate life up to 400,000 vehicles or more. The TJK3 B50 reducer adopts a combined sleeper plate. The life of the rail rubber pad is generally 50 to 600,000 vehicles, so the rubber pad needs to be replaced during the repair. TJK3 B50 reducer repair period of more than 10-12 million trips, so it is necessary to replace the rubber mat during this time, for this purpose, TIK3 a B50 reducer rubber pads using the positive general type, in order to replace.

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