A Comprehensive Method of Apportioning Reliability Goals for New Product of Hydraulic Excavator

Table 8

Weight of each component.

Units	Subsystems	Failure Parts	Failure Times	Allocation Factor ()	Failure rate ()
Unit1	Hydraulic	boom cylinder	10	0.06849315	0.000757814
		bucket cylinder	4	0.02739726	0.000303126
		arm cylinder	6	0.04109589	0.000454689
		pilot valve	7	0.04794521	0.000530470
		accumulator	4	0.02739726	0.000303126
		steel pipe	5	0.03424658	0.000378907
		hose	11	0.07534247	0.000833596
		main pump	7	0.04794521	0.000530470
		main valve	4	0.02739726	0.000303126
		ball valve	2	0.01369863	0.000151563
		transition joins	6	0.04109589	0.000454689
Unit2	Electric	GPS	9	0.06164384	0.000682033
		diode	3	0.02054795	0.000227344
		work lamp	1	0.00684932	0.000075781
		position switch	1	0.00684932	0.000075781
		wiring harnesses	3	0.02054795	0.000227344
		wipers	5	0.03424658	0.000378907
Unit3	Power	engine	1	0.00684932	0.000075781
		Accelerator knob	7	0.04794521	0.000530470
		auxiliary water	4	0.02739726	0.000303126
		belt	1	0.00684932	0.000075781
		starting motor	1	0.00684932	0.000075781
		gasoline pump	13	0.0890411	0.000985159
		radiator	2	0.01369863	0.000151563
		tank cap	6	0.04109589	0.000454689
Unit4	Working device	boom	5	0.03424658	0.000378907
		bucket	4	0.02739726	0.000303126
Unit5	Chassis	tension spring	3	0.02054795	0.000227344
		crawler	4	0.02739726	0.000303126
Unit6	Body and accessories	door lock	4	0.02739726	0.000303126
		sprinkling can	1	0.00684932	0.000075781
		air spring	2	0.01369863	0.000151563