Vehicle Door Crank Plate Geometry for Release Cable Pull
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Solution Overview
Problem
Existing vehicle door mechanisms face challenges in ensuring a sufficient pulling amount of the release cable to release the door latch without increasing the size of the cable pulling member or decreasing the ease of operation of the handle.
Innovation Solution
A vehicle door configuration that includes a handle, a handle arm turned about a rotary shaft, a cable pulling member with a contact surface that increases in distance from the rotary shaft as it moves opposite to the turning direction, and a latch device connected to the release cable. This configuration ensures the release cable is pulled effectively without enlarging the cable pulling member or complicating the handle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the size of the cable pulling member is increased to ensure sufficient pulling amount of the release cable, then the pulling amount of the release cable is increased, but the cable pulling member is likely to come into contact with other members (typically door glass) in the door due to vibration during vehicle travel
Solution Approach 1:
The cable pulling member is designed with a curved contact surface that follows an arc centered on the rotary shaft. This curvature allows the contact point to move along the arc as the member rotates, generating sufficient cable pulling distance without requiring a large member size. The curved geometry transforms rotational motion into linear cable displacement efficiently, resolving the contradiction between pulling amount and member size.
Solution Approach 2:
The invention utilizes the rotational dimension around the rotary shaft to generate linear displacement of the release cable. By positioning the contact surface at an appropriate distance from the rotary shaft and allowing it to move along an arc, the system converts angular rotation into effective linear pulling motion, achieving sufficient cable displacement without increasing the physical size of the cable pulling member in the linear dimension.
2Length of moving object
If the operation amount of the handle is increased to ensure the pulling amount of the release cable, then the pulling amount of the release cable is increased, but ease of operation of the handle for the user decreases
Solution Approach 1:
The curved contact surface on the cable pulling member creates a mechanical advantage through its arc geometry. As the handle rotates the cable pulling member, the contact point travels along the curved surface, which amplifies the rotational motion into greater linear cable displacement. This allows sufficient pulling amount to be achieved with a normal handle operation range, maintaining ease of operation while ensuring adequate cable pull.
Solution Approach 2:
The invention changes the geometric parameters of the cable pulling member, specifically the radius and curvature of the contact surface. By optimizing these parameters, the system achieves an efficient conversion ratio between handle rotation angle and cable displacement. This allows the release cable to be pulled the required distance with a moderate handle operation amount, preserving user comfort and ease of operation.
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 described configuration ensures an appropriate pulling amount of the release cable, preventing the need for a larger cable pulling member and maintaining ease of handle operation, thus effectively releasing the door latch.
Implementation Method 1
a cable pulling member that is configured to be turned about a rotary shaft with turning of the handle arm, thus pulling a release cable... the contact surface of the cable pulling member is formed such that a distance from the rotary shaft of the cable pulling member to the contact surface increases as the contact surface moves in a direction opposite to a turning direction
Data Source
AI summary
A vehicle door maintains a pulling amount of a release cable without increasing the size of a cable pulling member, or degrading ease of operation of a door handle. The door includes a handle gripped by a user; a handle arm turned about a hinge pin with operation of the handle; a crank plate turned about a hinge pin with turning of the handle arm, thus pulling a release cable; and a latch device that releases a door lock when the release cable is pulled. The crank plate pulls the release cable by causing a contact surface, which comes into contact with the release cable, to move with turning of the crank plate. The contact surface is formed such that a distance from the hinge pin to the contact surface increases as the contact surface moves in a direction opposite to a turning direction when opening the door.