Rolling prevention device

• US 20070052290A1
• Filed: 07/21/2006
• Published: 03/08/2007
• Est. Priority Date: 09/02/2005
• Status: Abandoned Application

• Current Assignee: Mando Corporation
• Original Assignee: Mando Corporation
• Inventors: Hwang, Yong
• Application Number:
  US11/490,550
• Publication Number:
  US 20070052290A1
• Time in Patent Office: Days
• US Class Current: 303/115.100
• CPC Class Codes: B60T 7/122 for locking of reverse movement
• CPC Class Codes: B60T 8/341 Systems characterised by their valves B60T8/36, B60T8/38 take precedence
• CPC Class Codes: B60T 8/4275 Pump-back systems

Abstract

A rolling prevention device for vehicles including a solenoid valve and relief valve parallel to each other. The solenoid valve and relief valve are connected to at least one hydraulic circuit, which is adapted to receive a hydraulic pressure from a master cylinder operated if a brake pedal is pressed. The relief valve has a valve sheet formed at an outer diameter portion thereof with a bypass. The bypass can be processed with ease by forming a V-shaped groove in the outer diameter portion or cutting and flattening a part of the outer diameter portion. Since a pressure in each wheel cylinder is able to be gently lowered via the bypass even if the brake pedal is released, a desired braking force can be maintained until a sufficient engine power is obtained, thus preventing unintentional rolling of a vehicle on a slope.

Claims

1. A rolling prevention device for use with an anti-lock brake system comprising a brake pedal, a master cylinder to be operated if the brake pedal is pressed, at least one hydraulic circuit provided in a modulator block and adapted to receive a hydraulic pressure from the master cylinder, a controller to control the hydraulic circuit, and a plurality of wheel cylinders to receive the hydraulic pressure that is controlled in the hydraulic circuit, the rolling prevention device comprising:

a solenoid valve installed between the master cylinder and the hydraulic circuit; and

a relief valve arranged parallel to the solenoid valve and having a bypass formed at an outer diameter portion of a valve sheet,

wherein the solenoid valve and relief valve are provided in the modulator block.

2. The device according to claim 1, wherein:

the solenoid valve is operated based on a rolling prevention operating signal applied from the controller; and

the relief valve closes an orifice at a preset pressure if the brake pedal is released, so as to lower the pressure in each wheel cylinder via the bypass.