Electric Parking Brake Actuator with Cycloid Reducer
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Solution Overview
Problem
Conventional manual parking brake systems require drivers to exert inappropriate force and have a large operating radius, which complicates operation and occupies valuable interior space in vehicles.
Innovation Solution
An electric parking brake system incorporating a motor, cycloid speed reducer, spindle member, and nut member to convert rotational motion into linear movement, enabling efficient operation and reduced space usage, with a compact actuator design that includes a cycloid speed reducer and direct spindle member coupling for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual parking brake system with a pivoting lever is used, then the brake shoes can be applied to the drum, but the operating radius is large and interior space is occupied
Solution Approach 1:
The patent replaces the manual mechanical pivoting lever system with an electric motor-driven actuator system. The motor (110) connects through a speed reducer (120) to a spindle member (130) that converts rotational motion into linear motion, eliminating the need for a large manual operating lever and reducing interior space requirements while maintaining brake application capability
Solution Approach 2:
The patent transforms the motion dimension from rotational pivoting (requiring large arc movement) to linear reciprocating motion. The spindle member (130) with male screw portion and nut member (140) with female screw portion converts the motor's rotational output into linear back-and-forth movement of the operating lever, achieving compact space utilization
2Device complexity
If a manual parking brake system is used, then the structure is simple, but the operating force required is inappropriate and operation is complicated
Solution Approach 1:
The patent substitutes the manual force application mechanism with an electric motor system. The motor (110) provides controlled electromagnetic force to actuate the brake, eliminating the need for the driver to apply inappropriate manual forces while maintaining relatively simple overall system structure
Solution Approach 2:
The patent changes the operating parameter from manual force magnitude control to electric motor control. The motor can precisely control the magnitude and direction of force applied to the operating lever, providing appropriate and controllable braking force without complicating the system structure
3Volume of moving object
If a compact actuator design is used, then space utilization is improved, but the actuator length must be minimized
Solution Approach 1:
The patent uses the screw mechanism to convert rotational motion into linear motion, effectively packing the actuator's functional length into a compact radial or axial footprint. The male screw portion (131a) and female screw portion (141a) enable the operating lever to move linearly while the motor rotates in place, minimizing the actuator's overall length
Solution Approach 2:
The patent nests the spindle member (130) with the nut member (140) within the actuator housing, creating a compact integrated assembly. The speed reducer (120) is connected to the motor (110) and the spindle member, with components arranged concentrically or in nested configurations to minimize the actuator's external dimensions while maintaining functional length
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The electric parking brake system provides convenient operation, reduced space occupancy, and minimized actuator length, facilitating faster braking and improved space utilization within vehicles.
Implementation Method 1
a motor (110) to generate drive power required to drive the pivoting lever (8)
Implementation Method 2
a cycloid speed reducer (120) connected to a rotating shaft of the motor (110) to amplify the drive power
Implementation Method 3
a spindle member (130) having a male screw portion (131a), and a nut member (140) having a female screw portion (141a) screwed to the male screw portion of the spindle member in a rectilinear reciprocal manner
Implementation Method 4
first and second brake shoes (2, 3) installed in both sides of the drum (1) to apply brake force to the drum (1)
Data Source
AI summary
Disclosed is a motor driven type electric parking brake system. The parking brake system includes a drum that is rotated along with a wheel, first and second brake shoes installed in the drum to apply brake force to the drum, an operating lever that supports the two brake shoes and pushes the two brake shoes against an inner surface of the drum when a pivoting lever is pulled, a motor to generate drive power to drive the pivoting lever, a cycloid speed reducer connected to a rotating shaft of the motor to amplify the drive power, a spindle member rotatably connected to the speed reducer and having a male screw portion, and a nut member having a female screw portion reciprocally screwed to the male screw portion. The nut member is moved in a longitudinal direction of the spindle member and supports an end of the pivoting lever.