Brake Pressure Generator Spindle Drive With Compact Planetary Gearset
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Solution Overview
Problem
Existing electromechanical brake pressure generators face challenges in optimizing the positioning of the spindle drive unit to maximize available installation space, particularly in coaxial configurations, while maintaining compactness and efficient force transmission.
Innovation Solution
The use of a multi-stage planetary gear set transmission coupled with a compact bearing assembly, including axial and radial bearings, such as needle or angular ball bearings, integrated within the housing to minimize space requirements and support axial and radial forces, allowing for a compact and efficient brake pressure generator design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multi-stage planetary gear set transmission is used, then the transmission ratio is increased and force transmission is improved, but the device complexity and installation space requirements increase
Solution Approach 1:
The patent combines the axial needle bearing and radial slide bearing into a single integrated bearing assembly that supports the spindle drive unit. This merging of bearing functions reduces the number of separate components and simplifies the overall transmission structure while maintaining the high transmission ratio achieved through the multi-stage planetary gear set.
Solution Approach 2:
The bearing assembly is nested within the housing structure, with the axial needle bearing and radial slide bearing arranged concentrically around the spindle drive unit. This nesting arrangement allows the multi-stage planetary gear set to achieve high transmission ratios without proportionally increasing the overall device volume or complexity.
2Volume of stationary object
If the bearing assembly is completely accommodated in the housing, then the installation space is reduced, but the ease of manufacture and assembly decreases
Solution Approach 1:
The bearing assembly is segmented into distinct functional components - the axial needle bearing for axial force reception and the radial slide bearing for radial force reception. This segmentation allows each bearing type to be optimized independently for its specific function while being integrated into a compact overall assembly that fits within the housing without excessive complexity.
Solution Approach 2:
The bearing assembly serves multiple functions simultaneously: it supports axial forces from the spindle drive unit, supports radial forces, and is completely accommodated within the housing to minimize installation space. The integrated design achieves this multi-functionality through the coordinated arrangement of needle and slide bearings within the confined housing volume.
3Volume of stationary object
If a compact bearing assembly with needle and slide bearings is used, then the installation space in axial and radial directions is reduced, but the reliability under combined axial and radial forces decreases
Solution Approach 1:
The patent applies different bearing types at different locations and for different force directions: axial needle bearings are used specifically for receiving axial forces along the spindle axis, while radial slide bearings are used for receiving radial forces perpendicular to the axis. This localized optimization of bearing quality ensures reliable force reception in each direction while maintaining compact overall dimensions.
Solution Approach 2:
The bearing assembly combines different bearing technologies - needle bearings (rolling contact) and slide bearings (sliding contact) - into a composite support system. This composite approach leverages the advantages of both bearing types: needle bearings provide low-friction axial support, while slide bearings provide reliable radial support, together achieving high reliability in a compact configuration.
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
This configuration enables a compact brake pressure generator with reduced installation space requirements, allowing for a greater transmission ratio and efficient force transmission, while maintaining the structural integrity and cost-effectiveness of the design.
Implementation Method 1
The bearing assembly includes an axial needle bearing for receiving the axial forces
Implementation Method 2
The bearing assembly includes a radial slide bearing for receiving the radial forces
Implementation Method 3
The bearing assembly includes an angular ball bearing for receiving axial and radial forces
Implementation Method 4
With the aid of the transmission, a spindle or a spindle nut of the spindle drive unit is drivable, which is rotatably mounted in a housing of the brake pressure generator via a bearing assembly receiving axial and radial forces
Data Source
AI summary
An electromechanical brake pressure generator including a spindle drive unit for converting a rotational motion of an electric motor-driven drive shaft into a translatory motion of a piston that is coupled to the spindle drive unit, the spindle drive unit being operatively connected to the drive shaft via a multi-stage transmission. The multi-stage transmission is a planetary gear set having a first and a second stage. With the aid of the transmission, a spindle or a spindle nut of the spindle drive unit is drivable, which is rotatably mounted in a housing of the brake pressure generator via a bearing assembly receiving axial and radial forces. A braking system for a vehicle including an electromechanical brake pressure generator is also described.