between the plates of a jaw crusher tensile stresses are in-duced in the particle. Thus the compressive force applied by the jaw plates causes the rock particle to fail in tension as shown in Figure 5 . Figure 3: Crushing actions  Figure 4: Single toggle jaw crusher  Figure 5: Fracture of rock particle under jaw-liner loading 3 W
Single Toggle Jaw Crusher Double Toggle Jaw Crusher In contrast the single toggle jaw crusher has fewer shafts and bearings and only one toggle which goes from the bottom of the swinging jaw to a fixed point at the back of the jaw crusher. The eccentric is located at the top of the swinging jaw and is part of the shaft.
The single toggle jaw crusher mechanism can be modelled as a planar mechanism as shown in Figure 1. However in this mechanism it is the coupler that is the output link and the transmission angle as defined in the above cited literature fails to be a suitable indicator of the efficacy of force transmission.
A sectional view of the single-toggle type of jaw crusher is shown below. In one respect the working principle and application of this machine is similar to the Dodge crushers; the movable jaw has its maximum movement at the top of the crushing chamber and minimum movement at the discharge point.
single toggle jaw crusher more common today as the primary crusher in quarrying operations . According to Carter [9 ] in 1999 s ales o f the single toggle jaw crus her exceed ed t hose o f the
single toggle jaw crusher working principle figure. working principle now single jaw crushers include one toggle that goes from the bottom of the swinging jaw right up to a certain point behind the jaw crusher. compared to double toggle jaw crushers single ones include fewer shafts and bearings.
Fig.4.5 swinging lever or pitman of the single toggle jaw crusher 52 Fig.4.6 assembled structure of swinging jaw plate with pitman 52 Fig.4.7 Finite Element Analysis Process in CATIA 54