Hydraulic Control Unit Press-Fit Connection for Compact Brake Layouts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Straddle riding-type vehicles face challenges in downsizing hydraulic pressure control units due to the large transverse width of bolt head connections between the base and housing, limiting the layout flexibility and requiring a more compact connection structure.
Innovation Solution
A hydraulic pressure control unit with a recessed portion in the base and a pin press-fitted into this recessed portion, connected via a through-hole defined by branch portions, and reinforced by an independent reinforcing member, allowing for a compact and durable connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bolt connection is used to connect the base to the housing, then the connection strength is improved, but the transverse width increases making downsizing difficult
Solution Approach 1:
The invention extracts the problematic bolt head from the connection structure and replaces it with a pin that has a small cross-sectional area. The pin is press-fitted into a recessed portion, eliminating the need for a large bolt head while maintaining connection strength through the press-fit mechanism and reinforcing member.
Solution Approach 2:
The pin is nested within the recessed portion formed in the base, with the reinforcing member also positioned within the recessed area. This nesting arrangement allows the connection structure to be embedded within the existing component geometry, minimizing the transverse width projection.
2Length of moving object
If the connection structure is simplified for downsizing, then the transverse width is reduced, but the durability may be compromised
Solution Approach 1:
The recessed portion is pre-formed in the base with precise dimensions and surface treatment before pin installation. This preliminary preparation ensures proper fit and stress distribution, enhancing the durability of the press-fit connection while maintaining a compact structure.
Solution Approach 2:
The reinforcing member acts as an intermediary element that distributes the mechanical stresses from the pin connection across a larger area of the base. This mediator prevents stress concentration at the pin interface, thereby improving durability without increasing the transverse width.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
To obtain a hydraulic pressure control unit that can respond to a request of downsizing, and a manufacturing method of such a hydraulic pressure control unit. A hydraulic pressure control unit of a braking system to be mounted to a straddle riding-type vehicle is provided with a base in which a flow path of a brake fluid is formed, a circuit substrate that controls driving of a hydraulic pressure adjusting valve to open and close the flow path, a housing in which the circuit substrate is housed, and a connection portion that connects the base to the housing, in which the connection portion is provided with a recessed portion that is formed in the base, and a pin that is held by the housing and includes an end portion that is press-fitted into the recessed portion, a through-hole is formed in the end portion that is press-fitted into the recessed portion, an outer periphery of the through-hole is defined by a first branch portion and a second branch portion, both ends thereof being connected to each other, of the end portion that is press-fitted into the recessed portion, and a reinforcing member independent of the base and the pin is brought into contact with and presses against at least either one of the first branch portion and the second branch portion.