A three-bar linkage curve is the locus of a fixed point M on the plane linked to the rod [PQ] of an articulated quadrilateral (APQB), A and B being fixed. The three “bars” are [AP] and [BQ] (called the cranks or the rocker arms) – and [PQ] (called the connecting rod, or the couple).

The four-bar linkage is a planar mechanism consisting of four rigid members: the frame, the input link, the output link, and the coupler link. These members are connected by four revolute pairs forming a closed-loop kinematic chain of 1-degree-of-freedom.

In great number of applications the output from a simple mechanism is the path traced by one of the points on the coupler link. These paths are generally called “coupler point curves” or “coupler paths”.

Transmission angle is the angle between the coupling member and the output member in a mechanism. • The angle between the direction of absolute motion and. direction of the relative motion of the point in which the. driven member gets the motion impulse.

The maximum and the minimum transmission angle is: mmin=18.570 (D1=71.430) and mmax=102.640 (D2=12.640). since mmin deviates most from 900, mmin is the critical transmission angle. The Classical Transmission Angle Problem. Design of Drag-link Mechanisms with Optimum Transmission Angle.

1. The law states that for a four-bar linkage system, the sum of the shortest and longest link of a planar quadrilateral linkage is less than or equal to the sum of the remaining two links, then the shortest link can rotate fully with respect to a neighbouring link.

Place a spirit level protractor on the driveshaft about halfway between the transmission and the Differential. Read and record the angle shown on the protractor scale and note whether the driveshaft points up or down at the front. Record the angle as “3 degrees up” or “2 degrees down,”etc.

15 degrees

An Offset Shaft, or Cardan Shaft as it is typically called,is a drive shaft, with u-joints, used to transfer power from a motor (driver) to a piece of equipment (driven). Offset denotes that the shafts of the driver and driven elements are not “inline” with each other.

Those needle bearings need to rotate in order for the u-joint to operate reliably and smoothly. These u-joint angles should always be at least 1-degree to avoid wearing out the yoke bearings. U-joints fail at 30* degrees.

1 to 3 degrees

E Series joints

In your case, it appears that the pinion is operating at an intersecting angle to the driveshaft. This will cause a vibration at speed. The reason adding weight with a passenger affects the vibration is that the intersecting angle has improved, but not eliminated, the problem.

A common symptom of a failing driveshaft is an intense shaking coming from underneath the vehicle. Worn out u-joints or bushings can cause the driveshaft to vibrate. Vibrations caused by tire balance issues are speed sensitive while driveshaft vibrations aren’t.

According to Currie, the average car crafter should strive for between 1 and 3 degrees between the tailshaft of the transmission and driveshaft, and 1 to 3 degrees between the driveshaft and pinion. Furthermore, the two angles should be nearly equal (between 1 and 3 degrees), but always opposite (see crude diagram).

three degrees

Re: Drop Shackles They will change the pinion angle, but not enough to cause any concerns. A 1.5-2″ rear drop will be so slight it will not cause any increase in wear of the u-joints.

So what symptoms would lead you to identifying bad pinion angle? Drive train vibration at speed, wheel hop and universal joint fatigue/failure are all good indicators. These things can come out of no where with suspension bushing failures, engine and transmission mount failures or even leaf spring fatigue and wrap.

Typically the transmission output shaft will be above the centerline of the pinion, ideally dropping on approximately a 3-degree angle or less. As the rear suspension and axle move up and down the distance between the transmission output shaft and the pinion changes.

While the actual setting of pinion angle does not have an effect on traction, in a leaf spring car, the changes encountered in the rear suspension during a launch can. So, while a stationary pinion angle will not have much effect on traction, once it moves, all bets are off.

It is the angle of the pinion shaft to the ground or the frame. The pinion shaft should be parallel to the engine crankshaft/transmission mainshaft. That angle is usually 4 degrees, up in front. That means your pinion should be at 4 degrees also, up in front. Sometimes with a leaf spring car, esp.

1nicenova wrote: I talked with travis at calvert racing & he said that 2-4 degrees negative with the caltracs was what they recommend. But thay set them by reading the angle at the tailshaft of the trans and the angle of the pinion.

By using the Ladder Bar to carry power to the chassis, the front end reacts by rising. As the front of the car travels upward, rapid weight transfer is created which “plants” the rear tires and propels the car forward.

When installed in an off-road vehicle, a ladder bar is used to provide better traction. By preventing the rear end of the vehicle and the front axle from rotating the 4X4 becomes more stable in situations where poor traction is experienced.

Traction bars are a solid bar on either side of the axle that connects to the frame with heim joints. This allows the suspension to still function properly while preventing axle wrap. Traction bars make sure all the torque is applied to the wheels and helps keep you going straight down the road without slipping.

When you tow heavy there is often terrible axle wrap. With the added weight and increases demand for power to move, the axle will rotate more then normal. Tractions bars will prevent this and keep your leafs in better condition.