Pneumatic rotary motor without connecting rods
A pneumatic rotary motor includes cylinders around a central channel, an inlet tube, an exhaust tube, ducts being in communication with the cylinders, a rotor in the channel and including an eccentric rotation member, a rotating shaft, an intake valve adapted to communicate the inlet tube with the duct or not, and an exhaust valve adapted to communicate the exhaust tube with the duct or not, and pistons slidably mounted in the cylinders and being in contact with the rotation member. Sequentially entering compressed air into each cylinder through the inlet tube, the intake valve, and the duct will push the piston to rotate the rotation member to output power from the rotating shaft, and release the air from one of the cylinders through the duct, the exhaust valve, and the exhaust tube at the end of each revolution of the rotor.
1. Field of Invention
The invention relates to pneumatic motors and more particularly to a pneumatic rotary motor without connecting rods and other associated components.
2. Related Art
Conventionally, a pneumatic motor can convert energy of compressed air into mechanical motion. There have been numerous suggestions in prior patents for pneumatic motor. However, such prior art pneumatic motors are typically relatively complex in constructions due to the increased number of connecting rods and unreliable in use. Thus, the need for improvement still exists.
SUMMARY OF THE INVENTIONIt is therefore an object of the present invention to provide a pneumatic rotary motor without any connecting rods so as to increase transmission efficiency, decrease the manufacturing cost, and make maintenance easy.
To achieve the above and other objects, the present invention provides a pneumatic rotary motor comprising a housing including a central, cylindrical channel, a plurality of cylinders equally spaced around a periphery of the channel and in communication therewith, an inlet tube, an exhaust tube, and a plurality of ducts each being in communication with the cylinder; a rotor fitted in the channel and including an eccentric rotation member on a top, a lower rotating shaft operatively connected to the rotation member, an intermediate intake valve adapted to communicate the inlet tube with the duct or not, and an exhaust valve adapted to communicate the exhaust tube with the duct or not; a plurality of pistons each slidably mounted in the cylinder and being in contact with the rotation member; and a plurality of cylinder head covers each releasably secured to an outer portion of the cylinder; whereby sequentially entering compressed air into each of the cylinders through the inlet tube, the intake valve, and the duct will push the piston to rotate the rotation member to output power from the rotating shaft, and release the air from one of the cylinders through the duct, the exhaust valve, and the exhaust tube at the end of each revolution of the rotor.
In one aspect of the present invention the number of each of the cylinders, the pistons, and the ducts is three, and thus a phase difference of 120 degrees exists between the compressed air entering one cylinder and the compressed air entering the next cylinder.
In another aspect of the present invention the number of each of the cylinders, the pistons, and the ducts is five, and thus a phase difference of 72 degrees exists between the compressed air entering one cylinder and the compressed air entering the next cylinder.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.
Referring to
The pneumatic rotary motor further comprises a rotor 20 fitted in the channel 11 and including an eccentric, cylindrical rotation member 21 on a top and having an outer periphery 211, a lower rotating shaft 22 operatively connected to the rotation member 21, an intermediate intake valve 23 adapted to communicate with one end of the inlet tube 13 and one end of the duct 15 or not, and an exhaust valve 24 adapted to communicate with one end of the exhaust tube 14 and one end of the duct 15 or not.
The pneumatic rotary motor further comprises three piston assemblies 30 each mounted in the tunnel 12. The piston assembly 30 comprises a cylinder 31 mounted in an outer portion of the tunnel 12 and being in communication with the other end of the duct 15, the cylinder 31 including a bore 311, a piston 32 slidably mounted in the bore 311 of the cylinder 31 and including an outer periphery 321, a head 322 at one end in contact with the outer periphery 211 of the rotation member 21, and an annular groove 323 in its intermediate portion with a piston ring (not numbered) put thereon, and an outer cylinder head cover 33 threadedly secured to the housing 10 to conceal the piston assembly 30 in the housing 10.
Referring to
Referring to
It is to be understood that the present invention is by no means limited only to the particular constructions herein disclosed and shown in the drawings, but also comprises any modifications or equivalents within the scope of the claims.
Claims
1. A pneumatic rotary motor comprising:
- a housing including a central, cylindrical channel, a plurality of cylinders equally spaced around a periphery of the channel and in communication therewith, an inlet tube, an exhaust tube, and a plurality of ducts each being in communication with the cylinder;
- a rotor fitted in the channel and including an eccentric rotation member on a top, a lower rotating shaft operatively connected to the rotation member, an intermediate intake valve adapted to communicate the inlet tube with the duct or not, and an exhaust valve adapted to communicate the exhaust tube with the duct or not;
- a plurality of pistons each slidably mounted in the cylinder and being in contact with the rotation member; and
- a plurality of cylinder head covers each releasably secured to an outer portion of the cylinder;
- whereby sequentially entering compressed air into each of the cylinders through the inlet tube, the intake valve, and the duct will push the piston to rotate the rotation member to output power from the rotating shaft, and release the air from one of the cylinders through the duct, the exhaust valve, and the exhaust tube at the end of each revolution of the rotor.
2. The pneumatic rotary motor of claim 1, wherein the number of each of the cylinders, the pistons, and the ducts is three.
3. The pneumatic rotary motor of claim 2, wherein a phase difference of 120 degrees exists between the compressed air entering one cylinder and the compressed air entering the next cylinder.
4. The pneumatic rotary motor of claim 1, wherein the number of each of the cylinders, the pistons, and the ducts is five.
5. The pneumatic rotary motor of claim 4, wherein a phase difference of 72 degrees exists between the compressed air entering one cylinder and the compressed air entering the next cylinder.
Type: Application
Filed: Sep 15, 2006
Publication Date: Mar 20, 2008
Inventor: Chia-Peng Lo (Taichung City)
Application Number: 11/521,797
International Classification: F01B 1/06 (20060101);