Forces Generated in the Parking Brake of the Pallet Locking System

Abstract

Automatic parking systems are parking structures with a computer-controlled automated vehicle loading and unloading process using sophisticated technological equipment. The paper describes a construction design for a pallet locking system, which is used to lock parking pallets with or without a vehicle, at a particular location and floor, that is, in a rack cell. This is one of the basic design concept variants of "Multi-Tower" automatic parking systems. This concept makes it possible to store cars stacked in rack cells. Cars on pallets are guided to the vertical cells of the parking system, stacked above each other on pallets, by an electric freight traction elevator. Pallets are stacked into the horizontal cells, on either or both sides, on a given floor of the parking system by means of a chain transfer device. After the pallet has been guided to a particular position, the pallet must be fixed in this position by the pallet locking system so that when the vehicle needs to be retrieved, the chain transfer device can again latch onto it and move it to the traction lift cage without any problems. The locking system also functions as a brake for the pallet carrying the parked vehicle. The paper also presents the theoretical calculations of the pallet brake, which is a crucial element of the pallet locking system of the conceptual variant of the "MULTI TOWER" automatic parking system.

Pallet Fixing Lock, Determination of Shear Resistance and Spring Stiffness

“…The amount of force F that must be exerted to push the pulley 2 fixation lock from the space between the two faces of the brake profile 6 of the brake profile assembly 7 is directly proportional to the compressive force F p of deformed springs 4 [5]. The forces in the horizontal plane F x and in the vertical plane F y required to push the pulley 2 from brake profile gap 7 can be determined by calculation according to [1,3]. The calculation methodology [3] and experimental measurements [4] show that the spring compression force is influenced by the friction resistance T, which is generated by the shear friction in the contact surface of the tube 3 and the plain bushing 5 (Fig.…”

“…The forces in the horizontal plane F x and in the vertical plane F y required to push the pulley 2 from brake profile gap 7 can be determined by calculation according to [1,3]. The calculation methodology [3] and experimental measurements [4] show that the spring compression force is influenced by the friction resistance T, which is generated by the shear friction in the contact surface of the tube 3 and the plain bushing 5 (Fig. 2) when inserting/withdrawing the "roller holder A" into/from body 1 of the fixation lock.…”

“…1 and Fig. 4) of a design different from that indicated in [1,2,3], the principle of their operation is identical to the locking Pallet Fixing Lock, Determination of Shear Resistance and Spring Stiffness brakes [1]. In order to verify the functional properties of the pallet fixation lock (Fig.…”

Vertical Forces Acting on the Lock-Off Element of the Pallet Brake System

“…According to [1,2] and relationship (13), the maximum value of instantaneous force F acting in a horizontal plane F x [N]can be calculated, which gives the initial displacement of the brake pulley from the circular recess of the brake ramp. Table 3 presents the theoretically calculated values of the compressive forces exerted by the V16-102, R16-102 and G16-102 springs when pushing the brake pulley into the filleted circular recess of the brake ramp of the pallet lock-off system, when the tangent from the horizontal plane to the outer surface of the pulley measures h H = 8 mm to the bottom surface of the structurally modified brake ramp.…”

“…Brake ramp 24 (original design see [2] Figure 2) has been structurally modified for the purpose of measurements, see Figure 3, due to the bending of the threaded rod 11 that connects the charge 34 motion screw 35 with holder 32 brake bodies 28 (see [1] Figure 1). The bending of the threaded rod 11 is caused by the forces generated when rolling the brake pulley over the inclined surface of the brake ramp 24, i.e.…”