Sliding Sleeve Limiting Tooth Profile for Transmission Synchronizer
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Solution Overview
Problem
Existing sliding sleeves for synchronizing devices in vehicle transmissions face challenges with expensive production costs and critical manufacturing tolerances due to complex stop teeth designs, which can lead to overshift and damage.
Innovation Solution
A sliding sleeve with engagement teeth and a limiting tooth having the same tooth profile, where the limiting tooth is designed to protrude into a tooth gap and function as a fully-fledged tooth for torque transmission, increasing the number of teeth and reducing flexural rigidity, allowing for higher torque transmission and uniform dynamic behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stop teeth are designed with modified shape to limit axial displacement, then axial displacement can be limited, but manufacturing complexity and cost increase
Solution Approach 1:
The limiting tooth is designed with the same profile as engagement teeth, allowing it to serve dual purposes: limiting axial displacement and transmitting torque. This multi-functionality eliminates the need for specialized stop tooth designs, reducing manufacturing complexity while maintaining reliability.
Solution Approach 2:
The invention changes the positional parameter of the limiting tooth relative to engagement teeth, placing it in a tooth gap rather than at a division position. This parameter change allows the limiting tooth to function effectively without requiring modified tooth shapes, thus avoiding increased manufacturing complexity.
2Reliability
If stop teeth are machined with greater tooth height, then axial displacement can be limited, but material removal and manufacturing time increase
Solution Approach 1:
The limiting tooth uses the standard tooth profile and height engaged with the carrier body, eliminating the need for additional material removal. It limits axial displacement through its position in the tooth gap rather than through increased tooth height, thus maintaining manufacturing productivity.
3Ease of manufacture
If stop teeth are formed with standard profile, then manufacturing is simpler, but manufacturing tolerances become critical
Solution Approach 1:
The limiting tooth acts as an intermediary element positioned in the tooth gap, mediating between the engagement teeth and the axial displacement limitation function. This intermediary position reduces the impact of manufacturing tolerances on the overall system performance.
Solution Approach 2:
By using the same profile as engagement teeth, the limiting tooth can be manufactured using the same tooling and processes, reducing the criticality of manufacturing tolerances while maintaining the ability to limit axial displacement effectively.
4Strength
If number of teeth is increased for torque transmission, then load-bearing capacity increases, but flexural rigidity decreases
Solution Approach 1:
The limiting tooth is positioned in the tooth gap rather than at the division position, representing a spatial reconfiguration. This dimensional change allows increased tooth engagement for torque transmission while maintaining structural integrity through optimized positioning rather than simply increasing tooth count.
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 solution enables higher torque transmission, increased load-bearing capacity, and reduced flexural rigidity, while maintaining uniform dynamic behavior, thus preventing overshift and enhancing the reliability of the synchronizing device.
Implementation Method 1
the limiting tooth is designed to protrude into a tooth gap and function as a fully-fledged tooth for torque transmission
Implementation Method 2
the limiting tooth is arranged between two pitch positions... the limiting tooth projects, at least partially, into the tooth gap
Data Source
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AI summary
Synchronizing units are used in transmissions of vehicles in order to bring a shaft and a gear wheel to an identical rotational speed and, after this synchronization, to couple the shaft and the gear wheel for conjoint rotation. The aim of the present invention is to propose a sliding sleeve having improved functional characteristics and to propose a corresponding synchronizing device or dog clutch having the sliding sleeve. This aim is achieved by means of a sliding sleeve (6) for a synchronizing device (1) or dog clutch of a transmission, wherein the sliding sleeve (6) is designed as an annular body and defines a main axis (H), wherein pitch positions (T) are defined on the annular body, wherein the pitch positions (T) are distributed regularly around the main axis (H) with the spacing of a pitch (t), with a plurality of engagement teeth (12), wherein the engagement teeth (12) are designed as internal teeth, wherein each of the engagement teeth (12) is arranged in a pitch position (T), wherein the sliding sleeve (6) has at least one engagement region (14), in which at least two engagement teeth (12) are arranged in pitch positions (T) which are adjacent in the circumferential direction, with at least one limiting tooth (13) for limiting axial motion of the sliding sleeve (6), wherein the limiting tooth (13), at least in some regions, is arranged in a gap between two pitch positions (T), wherein the tooth profile in a sectional plane extending through the limiting tooth (13) preferably centrally with respect to an axial direction is identical in the case of the limiting tooth (13) and in the case of at least one of the engagement teeth (12).