US 9,810,322 B2 · Piston unit of a working cylinder

Abstract

A piston unit of a working cylinder has first and second coupling partners. The first coupling partner is a piston. The second coupling partner a piston rod. The piston rod is inserted axially into the piston. Each of the coupling partners has an annular groove. The groove of the piston rod is an external groove. The groove of the piston is an internal groove. The grooves of the coupling partners lie opposite one another. The unit has a coupling strand which engages in the grooves of the coupling partners and is placed into engagement by insertion into an annular groove gap defined by the grooves. The engagement of the coupling strand in the grooves produces a form-locking connection between the partners. The piston rod is oversized in relation to the piston and provides an additional frictional connection.

Drawings

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Drawings

Claims8

Dependent claims

A piston unit of a working cylinder, comprising:

a first coupling partner being a piston and a second coupling partner being a piston rod, said second coupling partner being coaxially inserted into a bore within said first coupling partner along a longitudinal axis;
said first and second coupling partners each having a respective annular groove formed therein, said annular groove of said second coupling partner being an external groove on an outer surface of said piston rod and said annular groove of said first coupling partner being an internal groove on an internal surface of said bore in said piston, said annular grooves of said first and second coupling partners being disposed opposite one another and defining an annular-groove chamber, said first coupling partner having an access opening extending from an outer surface of the piston to said annular-groove chamber;
a coupling strand for engaging into said annular grooves of said first and second coupling partners, said coupling strand being insertable into said annular-groove chamber through said access opening, an engagement of said coupling strand into said annular grooves of said first and second coupling partners effecting a positive locking connection between said first and second coupling partners;
said second coupling partner having an oversize in relation to an internal diameter of said bore of said first coupling partner, for providing an interference fit effecting a non-positive locking connection between said first and second coupling partner, said interference fit preventing relative movement between said first and second coupling partners for preventing damage to seal elements of the piston unit;
a hybrid coupling action produced by said interference fit and said coupling strand, said hybrid coupling action including a frictional locking between said first and second coupling partners resulting from said interference fit for axially and rotational locking said first and second coupling partners to one another, said coupling strand for accommodating axial forces acting on said first and second coupling partners.

2 more elements

Dependencies are inferred from the claim text.

Description4,659 words

Summary3,407 words

#The invention relates to a piston unit of a working cylinder, provided in particular as a hydraulic or pneumatic pressurized-flow consumer.

#Working cylinders as hydraulic or pneumatic pressurized-flow consumers which have a piston unit are generally known from the prior art.

#Working cylinders of said type are generally of multi-part form, wherein the piston unit is composed of a piston and of a piston rod connected to said piston.

Brief description of the drawings8 figures

#The invention will be explained in more detail below, on the basis of exemplary embodiments, with reference to:

#FIG. 1 which shows a sectional illustration of a piston unit without a coupling strand,

#FIG. 2 which shows a sectional illustration of a piston unit with a coupling strand,

Detailed description1,104 words

#FIG. 1 shows a piston unit according to the invention, without a coupling strand, in a full section.

#The piston unit is of multi-part form and has a piston 1 and a piston rod 2, wherein the piston rod 2 has been partially inserted into the piston 1.

#Below, the piston 1 and the piston rod 2 will also be described collectively as coupling partners.

Facts

Application

14/429,457Filed 19 Sep 2013

Priority

DE 20 2012 008 997 U19 Sep 2012

Published

US 2015/0226326 A113 Aug 2015

Granted

7 Nov 2017

Term ends

27 Apr 2034

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 220 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification8 codes

F16J 1/12
Connection to driving members: with piston-rods, e.g. rigid connections
F15B 15/1447
Component parts; Constructional details: pistons; Piston to piston rod assemblies
F16B 3/04
Key-type connections; Keys: using keys formed of wire or other flexible material, to be inserted through an opening giving access to grooves in…
Y10T 403/7075
Interfitted members: including discrete retainer

Timeline

19 Sep 2012Priority claimedDE 20 2012 008 997 U
19 Sep 2013Application filedUS 14/429,457
2 Apr 2015Assigned to Buemach Engineering International B.V.assignment of assignor's interest
13 Aug 2015PublishedUS 2015/0226326 A1
7 Nov 2017GrantedUS 9,810,322 B2
12 Oct 2026TodayWithin its term
27 Apr 2034Term endsEstimated, includes 220 days of adjustment

Piston unit of a working cylinder

Life of this patent

Piston unit of a working cylinder

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims8

Description4,659 words

Drawings

Classification8 codes

Life of this patent

Description4,659 words