Piston for a fluid pump

The piston design with a cup-shaped cap, sleeve-shaped nut, and ring nut arrangement addresses radial clearance issues by allowing radial play compensation, improving operational efficiency and component replacement in fluid pumps.

WO2026124871A1PCT designated stage Publication Date: 2026-06-18ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ROBERT BOSCH GMBH
Filing Date
2025-11-10
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing piston designs for fluid pumps, particularly in compressor assemblies, suffer from radial clearance compensation issues due to manufacturing and assembly tolerances, which cannot be adequately addressed by current positive-locking connections, leading to potential operational inefficiencies.

⚗Method used

A piston design featuring a cup-shaped piston cap, sleeve-shaped cylinder nut, and ring nut arrangement that allows for a floating bearing, enabling axial clearance adjustment without preventing radial movement, thereby compensating for manufacturing and assembly tolerances through a floating bearing mechanism.

🎯Benefits of technology

The design achieves effective radial play compensation around the entire circumference of the piston, minimizing axial movement and reducing frictional forces, thus enhancing operational efficiency and ease of component replacement.

✦ Generated by Eureka AI based on patent content.

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    Figure EP2025082405_18062026_PF_FP_ABST
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Abstract

The invention relates to a piston (10) for a fluid pump, the piston being indended for securing to a first end (21) of a drive piston (20) which can be moved back and forth linearly along a stroke direction (x) in a cylinder chamber (200) of the fluid pump, the first end (21) of the drive piston having a disc-shaped end portion (22) which is oriented perpendicularly to the stroke direction (x), and the piston (10) comprising: a substantially pot-shaped piston cap (30) which can be placed on the end portion (22) of the drive piston (20) from a first side (23) of the disc-shaped end portion and which is designed to delimit a working space (202) between the piston (10) and the cylinder chamber (200) in the stroke direction (x); a substantially sleeve-shaped cylindrical nut (40) which is designed to receive at least part of the drive piston (20) along the stroke direction (x) and to contact the disc-shaped end portion (22) from a second side (24) of the disc-shaped end portion (22), the second side lying opposite the first side (23); and a substantially sleeve-shaped ring nut (50) which is designed to hold the piston cap (30) and the cylindrical nut (40) at a defined axial distance to one another along the stroke direction (x).
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