초록 ▼

An impulse unit (10) is disclosed which provides for a symmetric transfer of torque between a case (16) and spindle (18) selectively for one or two impulses for each relative rotation between the case and spindle. A pair of cylindrical rollers (84, 86) is provided to isolate two symmetric chambers b

An impulse unit (10) is disclosed which provides for a symmetric transfer of torque between a case (16) and spindle (18) selectively for one or two impulses for each relative rotation between the case and spindle. A pair of cylindrical rollers (84, 86) is provided to isolate two symmetric chambers between the case and spindle to transfer torque therebetween. The use of cylindrical rollers reduces the overall wear in the tool, improves oil sealing capability during long time use, and reduces the cost of manufacture.

대표청구항 ▼

An impulse unit, comprising: a case defining an interior cavity of predetermined length centered on a first axis, the wall of the cavity having a generally elliptical cross section perpendicular to the first axis with mutually perpendicular minor and major axes, the wall defining first and second se

An impulse unit, comprising: a case defining an interior cavity of predetermined length centered on a first axis, the wall of the cavity having a generally elliptical cross section perpendicular to the first axis with mutually perpendicular minor and major axes, the wall defining first and second seal lands on opposite sides of the first axis along the minor axis, each extending the entire length of the cavity; a spindle mounted to the case for relative rotation between the case and spindle about the first axis, the spindle extending through the cavity and having an outer surface, the outer surface defining first and second seal lands thereon on opposite sides of the first axis, the spindle further having a first recess formed therein through the outer surface, the first recess extending parallel the first axis the length of the cavity on one side of the first axis between the first and second seal lands on the spindle, and a second recess formed therein through the outer surface, the second recess extending parallel the first axis the length of the cavity on the opposite side of the first axis from the first recess between the first and second seal lands on the spindle; a first cylindrical roller having a length equal to the length of the cavity and partly received within the first recess of the spindle for simultaneous contact with the surface of the first recess and the wall of the cavity; a second cylindrical roller having a length equal to the length of the cavity and partly received within the second recess for simultaneous contact with the surface of the second recess and the wall of the cavity; means for maintaining a fluid in the spaces between the wall of the cavity and the outer surface of the spindle; and means for rotating the case and spindle relative each other about the first axis, alignment of the first seal lands on the case and spindle and the second seal lands on the case and spindle temporarily isolating a first pair of chambers formed between the spindle and case from a second pair of chambers formed between the spindle and case to fluidically couple the case and spindle for joint rotation to transfer a torque impulse therebetween until sufficient fluid passes between the first pair of chambers to the second pair of chambers to misalign the seal lands and decouple the case from the spindle.