A motor assembly for a pneumatic tool includes: a motor cylinder coaxially secured in a tubular inner housing, which is coaxially secured in a tubular outer housing and has an inlet passage defining a longitudinal axis, including a valve seat, and defining forward and reverse passages that communica
A motor assembly for a pneumatic tool includes: a motor cylinder coaxially secured in a tubular inner housing, which is coaxially secured in a tubular outer housing and has an inlet passage defining a longitudinal axis, including a valve seat, and defining forward and reverse passages that communicate with a motor chamber and extend through the valve seat, and an exhaust port that communicates with the motor chamber, and a throttle passage defined between the inner and outer housings; a motor rotor supported within the motor chamber and rotatable in a forward or reverse direction; and a rotary valve coaxially disposed in the inner housing, supported by the valve seat, and rotatable about the longitudinal axis between forward and reverse positions.
대표청구항▼
1. A motor assembly for use in a pneumatic tool, said motor assembly comprising: a housing unit includinga tubular outer housing, anda tubular inner housing coaxially secured in said tubular outer housing and having an inlet passage that defines a longitudinal axis, said tubular inner housing cooper
1. A motor assembly for use in a pneumatic tool, said motor assembly comprising: a housing unit includinga tubular outer housing, anda tubular inner housing coaxially secured in said tubular outer housing and having an inlet passage that defines a longitudinal axis, said tubular inner housing cooperating with said tubular outer housing to define a throttle passage therebetween;a motor cylinder coaxially secured in said tubular inner housing, and including a valve seat that has a central axis collinear with the longitudinal axis, said motor cylinder defining a motor chamber, forward and reverse passages each of which communicates with said motor chamber, partially extends through said valve seat, and has at least one opening formed in an inner surrounding surface of said valve seat of said motor cylinder, and at least one exhaust port that communicates with said motor chamber and said throttle passage for exhaust of motive fluid from said motor chamber to said throttle passage;a motor rotor supported within said motor chamber in said motor cylinder for rotation about the longitudinal axis, said motor rotor being able to rotate in a forward direction in response to flow of the motive fluid into said motor chamber from said forward passage, and to rotate in a reverse direction opposite to said forward direction in response to flow of the motive fluid into said motor chamber from said reverse passage;a rotary valve coaxially disposed in said tubular inner housing of said housing unit, supported by said valve seat of said motor cylinder, and having a valve passage, said valve passage having a first section that extends along the longitudinal axis and that is in fluid communication with said inlet passage, and a second section that is in fluid communication with said first section, said second section of said valve passage having an opening that is formed in an outer surrounding surface of said rotary valve abutting against said inner surrounding surface of said valve seat of said motor cylinder, that is able to be in fluid communication with said opening of said forward passage or said opening of said reverse passage, and that is configured not to extend through an axial end surface of said rotary valve, said rotary valve being rotatable relative to said valve seat of said motor cylinder about the longitudinal axis between a forward position, where said valve passage is placed in communication between said inlet passage in said tubular inner housing and said forward passage in said motor cylinder, and a reverse position, where said valve passage is placed in communication between said inlet passage in said tubular inner housing and said reverse passage in said motor cylinder; anda valve actuating unit mounted movably to said housing unit and operable to actuate rotation of said rotary valve between the forward and reverse positions;wherein said tubular inner housing of said housing unit is formed with a second slot that communicates with said throttle passage;wherein said rotary valve has an annular outer surface formed with an U-shaped groove;wherein, when said valve passage of said rotary valve communicates with one of said forward and reverse passages in said motor cylinder, the other one of said forward and reverse passages in said motor cylinder communicates with said U-shaped groove in said annular outer surface of said rotary valve; andwherein said valve seat of said motor cylinder has an annular outer surface formed with an opening that communicates with said second slot in said tubular inner housing and said U-shaped groove in said annular outer surface of said rotary valve. 2. The motor assembly as claimed in claim 1, wherein said tubular inner housing of said housing unit is formed with a first slot that communicates between said exhaust port in said motor cylinder and said throttle passage. 3. The motor assembly as claimed in claim 1, wherein: said housing unit defines an exhaust passage between said tubular outer housing and said tubular inner housing; andsaid tubular inner housing of said housing unit includes an intermediate portion that surrounds said rotary valve, said intermediate portion being formed with at least one interconnecting passage that extends in a direction parallel to the longitudinal axis and that communicates between said opening in said valve seat of said motor cylinder and said exhaust passage. 4. The motor assembly as claimed in claim 1, wherein: said forward passage in said motor cylinder includes a first forward passage portion communicating with said motor chamber, and at least one second forward passage portion formed in said valve seat;said reverse passage in said motor cylinder includes a first reverse passage portion communicating with said motor chamber, and at least one second reverse passage portion formed in said valve seat;when said valve passage of said rotary valve communicates with said second forward passage portion of said forward passage, said second reverse passage portion of said reverse passage communicates with said U-shaped groove in said annular outer surface of said rotary valve; andwhen said valve passage of said rotary valve communicates with said second reverse passage portion of said reverse passage, said second forward passage portion of said forward passage communicates with said U-shaped groove in said annular outer surface of said rotary valve. 5. The motor assembly as claimed in claim 1, wherein said valve actuating unit includes a valve actuator, said valve actuator including a head portion mounted movably on said tubular outer housing of said housing unit, and a stem portion connected to said head portion and extending through said tubular outer housing and said tubular inner housing to engage said rotary valve, such that said head portion of said valve actuator is movable relative to said tubular outer housing to cause rotation of said rotary valve between the forward and reverse positions. 6. The motor assembly as claimed in claim 5, wherein said valve actuating unit further includes an operating ring sleeved rotatably on said tubular outer housing of said housing unit and in engagement with said head portion of said valve actuator, such that said operating ring is rotatable relative to said tubular outer housing about the longitudinal axis to cause movement of said valve actuator.
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이 특허에 인용된 특허 (4)
Ghode Anil P. (Mundelein IL) Diedrich Thomas J. (Racine WI) De Rome Raymond D. (Twin Lakes WI), Air motor with offset front and rear exhausts.
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