Rubber Spring:SRX,SRXT
6Pages

General Description of Rubber Spring FOR HIGH DEFLECTION Bulge of Outer Diameter Features (1) Durability: Durability for 100 strokes (at deflection of 35%) These rubber springs have the ability to resist unti oil, chemical, heat, dust, corrosion. (2) Maximum deflection: 35% (3) Permanent set: 2% or less (at deflection of 35% and 300,000 strokes) (4) High buckling resistance: Buckling does not occur in parallel load. At the inclination of 3˚, the spring has buckling limit of 35%. (5) Compact size: Since the deflection is large, the free length is approximately half of the coil spring. (6) Maximum load: The load is increased by approx. 10% more than the conventional parts (SR cushion). Application Range (1) Heat resistance When the SRX is repeatedly compressed, it generates heat with hysteresis effect. Temperature rise reaches a balanced value and becomes constant around 1,000 strokes. The larger the volume, deflection rate and strokes per minute (spm) are, the larger temperature rise is. When 80 x L160 x inner diameter 22 is used at the deflection of 35% and at 40 spm, the balanced temperature rise is approx. 30°C. Continuous heat resistance of the SRX is 80°C. (2) Dust resistance The SRX is very resistant to the atmosphere with much dust or machined powder. If such dust or powder is buried in the pressurizing surface or fixed area, crack does not grow. Use the SRX as it is. (3) Scratch resistance If the SRX has scratches in the compression direction, it may not be broken immediately. It is better to replace it at an early stage. (4) Durability At the deflection of 35%, the durability is one million strokes. If the SRX is desired to be used more than 35% (up to 40%), please contact us. Pressure Source Components When the SRX is compressed, the outer diameter is bulged. The bulge rate is not relevant to the spring size. It is proportional to the deflection rate and the rate is almost constant of D = 0.81 Bulge rate of outer diameter: D= hD −hD 0 p100 hD 0 Deflection rate: = S p100 L Where D0: Initial outer diameter mm, L: Initial length mm D : Maximum outer diameter, S: Deflection mm Therefore hD = 1 0.81 S phD0 L The required clearance between the maximum bulge diameter and the wall is at least 5 mm. SRX is the product with a special blending method of various rubbers. It is resistant to large deflection (35%) and high load. Permanent set is limited. It is very cost effective compared to coil springs or urethane springs. Great improvement of durability (5) Oil resistance and chemical resistance Machine Oil Grinding Oil Cutting Oil Hydraulic Oil Gear Oil Gasoline Turbine Oil Acetone Anitone Ammonia Ethyl Alcohol Hydrochloric Acid (Hot) Hydrochloric Acid (Cold) Glycerin u W p Trichlene Oxalic Acid y Nitric Acid (Diluted) u Fuming Nitric Acid p Tar W Toluene p Phenol W Benzene p Paint Thinner W Sulfuric Acid (Diluted) y Sulfuric Acid (Concentrated) p W Varnish Acetic Acid Diethyl Ether u No Change y Slightly Changed. W Considerably Changed. p Not Allowed.

General Description of Rubber Spring FOR HIGH DEFLECTION Application Example of SRX Clearance hole Within (rubber inner diameter + 2 to 3 mm) Seating diameter Deep hole diameter Refer to the standard page for detailed dimensions. (1) Use retainer SORTB whose retaining force is improved. (2) It is recommended that resin spacer SOIS be used to prevent heating between rubber springs when the SRX is used in stages. (3) Use guide pin (manufactured by customer) with the diameter smaller by 1 to 2 mm than the rubber inner diameter and with precision finish ( 1.6 ). (4) When the SRX is used in...

Rubber Spring FOR HIGH DEFLECTION S Retainer used for SRXT (with Retainer) When overall length is L40 the retainer is SORTA. 40-30 is SRX only. When the deflection is 35%, the SRX can be used up to one million strokes. Refer to page 516 for retainer ( ) and the spacer for stack use of springs. F value in above chart shows average force. Load-deflection diagram shown next page is from actual test data. Pressure Source Components Special blend rubber S25C Hardness : Shore A69

Rubber Spring LOAD - DEFLECTION DIAGRAMS SRX40 Compression Return Compression Return Compression Return Compression Return Compression Return Compression Return Compression Return Pressure Source Components

Rubber Spring LOAD - DEFLECTION DIAGRAMS SRX80 14 Compression Return Compression Return Compression Return Compression Return Compression Return Compression Return Compression Return Pressure Source Components

Rubber Spring LOAD - DEFLECTION DIAGRAMS SRX100 35 SRX100-100 Pressure Source Components Compression Return Compression Return Compression Return