US 7,029,253 B2Granted

Pneumatic tool having a pneumatic cylinder for avoiding failure of bearings

AssigneeGison Machinery Co., Ltd.

InventorFreddy Lin

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Abstract

A pneumatic cylinder of pneumatic tool capable of avoiding failure of bearings, including: a cylinder body having an internal cylindrical chamber in which a rotor is disposed, a rotary shaft being fixedly connected with the rotor, whereby high pressure air can flow into the cylinder body to drive and rotate the rotor and the rotary shaft; two end caps respectively covering two ends of the cylinder body, two ends of the rotary shaft respectively extending out of the cylinder body through the through holes of the two end caps; two bearings respectively installed in the cavities of the two end caps and fitted on two ends of the rotary shaft; and two airtight rings located between the bottom walls of the cavities and the bearings to achieve an airtight effect between the bottom walls of the cavities and the bearings.

Claims6

Dependent claims

A pneumatic cylinder of a pneumatic tool comprising:

a) a cylinder body having:
i) an cylindrical chamber;
ii) an inlet located in the in a wall thereof and communicating with the cylindrical chamber;
and
iii) a predetermined number of outlets communicating with the cylindrical chamber;
b) two end caps, one of the two end caps is located on each of two opposing ends of the cylindrical body, each of the two end caps having:
i) a first central through hole;
ii) an annular projecting wall;
and
iii) a circular cavity extending through the annular projecting wall and communicating with the first central through hole, the circular cavity having a circular dent located in a bottom thereof;
c) a rotor located in the cylindrical chamber and having a rotary shaft being fixed thereto, one of two ends of the rotary shaft being inserted through the first central through hole of each of the two end caps;
d) two bearings, one of the two bearings being located in the circular cavity of each of the two end caps;
and
e) two airtight rings, one of the two airtight rings being located in each circular dent between one of the two bearings and the bottom of the circular cavity of each of the two end caps, each of the two airtight rings having a second central through hole, one of two ends of the rotary shaft being inserted through the second central through hole of each of the two airtight rings.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/722,533Filed 28 Nov 2003
Published: US 2005/0118050 A12 Jun 2005
Granted: 18 Apr 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F01C 1/3442
The inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation: the surfaces of…
F01C 21/108
Stators; Members defining the outer boundaries of the working chamber: with an axial surface, e.g. side plates
F04C 2240/52
Bearings: for assemblies with supports on both sides
F01C
Rotary-piston or oscillating-piston machines or engines