SU1280232A1 - Shoe brake braking cylinder - Google Patents

Abstract

The invention relates to mechanical engineering and can be applied in hydraulic brake systems. The aim of the invention is to improve performance by increasing the speed of the brake cylinder of the shoe brake. In the case of a wheel cylinder there is a piston (П) 2 with a seal 3 and with an elastic ring 4 installed with an axial bore P an additional piston (DP) 5 with a flange (F) 6. A mechanical seal 9 is installed between the F and P with an axial clearance. During braking, the brake fluid under pressure flows through the opening 14 into the working cavity 15 and through the gap between the F and the housing 1 into the space of between F and P. DP overcomes the resistance of spring 12 and moves in the axial bore P. Thrust ring 4 keeps P of displacement. After the contact F with the mechanical seal 9, the DP and P move together, under pressure sufficient to move the ring 4. The pad 1 1 is pressed against the drum 13. After the pressure is released, the pad 11 moves under the action of the spring 12 only by the stroke of the PD. Shifter Shchaets only when braking on the amount of wear of a pair of friction. 1 il. / J (L 1C 00 o to with

Description

The invention relates to mechanical engineering and can be applied in hydraulic brake systems.

greater axial force and braking torque respectively.

When a fluid is depressurized by a torch, the purpose of the invention is to improve 5, the block 11 under the action of the return spring 12 moves in the direction of the housing 1 only by the stroke of the additional piston 5, i.e. up to the tip 10 in

exploitation characteristics by increasing the speed of the shoe brake brake. The drawing depicts the brake shoe coaxial brake, general view. W piston 2. Stroke is determined by the selected stroke between the pads.

In the housing 1, the wheel dilander is 11 and the drum 13. The spring force is placed on the piston 2 with a seal of -3, in the groove of the piston 2 a stop ring 4 of the automatic regulator of the gap is installed with an effort, and in the axial bore (not indicated) a piston 5 with a flange 6. The additional piston 5 is sealed in the bore of the piston 2 by a seal. Mezhdu20 is automatically maintained by the required flange 6 and the end of the piston 2 with an axial clearance between the brake drum 8, and a three-way seal 13 and brake pads 11, position 9. The additional piston 5 is connected to the terminal 11 pressed to it. a return piston 5 with a small diameter spring 12 i 25, and the block 11 is installed. The fluid flow rate required by the nozzle with a clearance relative to the bar for supplying the pads 11 decreases, ban 13. At the opening 14, the working cavity 15 of the wheel cylinder communicates with the drive. 30 6, i.e. almost wheel diameter- Brake works as follows. of a cylinder. During braking, the brake fluid under pressure through the opening 14 in the cylinder body 1 enters the working cavity 15 and through the gap between the flange 6 and the cylinder body 1 into the space between the flange 6 and the piston 2. The fluid pressure acts simultaneously on the piston. 2 and additional piston 5, after-40

12 is chosen such that it is insufficient to move the piston 2 mounted in the cylinder body 1 on the thrust ring 4 with tension. Thus, the piston 2 moves only during braking almost by the amount of wear of the pair of friction. By this

moreover, the choice of this gap during braking is made possible by the movement of the surplus, while the created braking force is determined by the area of the flange

Consequently, significant braking moments will be achieved with a small course of the control lever (not shown).

Claims (2)

The invention relates to mechanical engineering and can be applied in hydraulic brake systems. The aim of the invention is to improve the operating characteristics by increasing the speed of the shoe brake brake. The drawing depicts the brake shoe coaxial brake, general view. A piston 2 with a seal of -3 is located in the housing 1 of a wheel-mounted diesel cylinder; in the groove of the piston 2, the stop ring 4 of the automatic regulator of the clearance is installed, and in the axial bore (not indicated) an additional piston 5 with a flange 6. The additional piston 5 is sealed It is sealed from the piston 2 version. A flange seal 9 is located between the flange 6 and the end of the piston 2 with an axial clearance 8. An additional piston 5 through the tip 10 is connected with a block 11 pressed against it by a return spring 12, the block 11 being installed with a clearance relative to the drum 13. Through the hole 14 the working cavity 15 of the wheel dilindr communicates with the drive. The brake operates as follows. During the braking process, the brake fluid under pressure through the hole 14 in the cylinder body 1 enters the working cavity 15 and through the gap between the flange 6 and the cylinder body 1 into the space between the flange 6 and the piston 2. The fluid pressure acts simultaneously on the piston 2 and the additional piston 5, the last scientific research institute, overcoming the resistance of the spring 12, moves in the axial bore of the piston 2, which is kept from displacement by the thrust ring 4. After the flange 6 comes into contact with the face pack otneniem 9, there is a joint motion of the pistons 2 and 5, it is possible to increase after a fluid pressure sufficient to shear the ring 4. The operation is carried out the process of the can torus. Thus, at the initial braking time, when choosing the gap between the flange 6 and the seal 9, only the small diameter piston 5 moves, and at the final moment, when the shoe 11 is led to the drum 13, the fluid presses over the entire area of the flange 6 and creates a much greater axial force and respectively, the braking torque. When the fluid is depressurized, the torch, in response to the action of the return spring 12, moves in the direction of the housing 1 only by the stroke of the additional piston 5, i.e. until the tip 10 stops in the piston 2. The stroke is determined by the selected stroke between the pads 11 and the drum 13. The spring force 12 is chosen so that it is not sufficient to move the piston 2 mounted in the cylinder body 1 on the thrust ring 4 with tension. Thus, the piston 2 moves only during braking almost by the amount of wear of the pair of friction. This automatically maintains the necessary clearance between the brake drum 13 and the brake pads 11, and the choice of this gap during braking is made possible by the movement of the additional piston 5 with a small diameter. The flow rate of the fluid required for the supply of the pads 11 is reduced, while the braking force generated is determined by the area of the flange 6, i.e. almost the diameter of the wheel cylinder. Consequently, significant braking moments will be achieved with a small course of the control lever (not shown). Claims The brake cylinder brake shoe, comprising a housing at least one piston sealed in an outer diameter, located in the housing, and an automatic clearance adjuster, formed in the form of an anvil ring mounted in a piston bore with a tension on the inner surface of the cylinder mirror, differing in that, in order to improve performance by increasing speed, it is equipped with an additional piston with a flange and bearing surface for contact with brake pads and a torus The central piston has a through axial bore, with an additional piston mounted in the axial bore with the ability to move and with 31280232 4 seal on the outer diameter of the piston and the end of the main piston, the mechanical seal is located with the flange is located with a gap in the casing gap between the flange additionally.