JP2009276190A5

JP2009276190A5 -

Info

Publication number: JP2009276190A5
Application number: JP2008127261A
Authority: JP
Filing date: 2008-05-14
Publication date: 2010-01-21
Anticipated expiration: 2028-05-14

Claims

A servo motor,
An input shaft having an outer peripheral surface at least partially formed with a square screw and connected to a rotation shaft of the servo motor;
A roller that has a cylindrical surface that contacts the flank of the square screw and engages the square screw;
A linear guide mechanism comprising a rail and a runner block configured to be movable along the rail;
A connecting member to which the shaft of the roller is fixed and fixed to the runner block;
A cylindrical roller bearing that rotatably supports the cylindrical surface of the roller with respect to the axis of the roller, wherein substantially the entire cylindrical roller bearing is accommodated in the valley of the square screw;
An output shaft fixed to the connecting member;
A movable table fixed to the output shaft;
Control means for vibrating the movable table by driving the servo motor while switching the rotation direction of the rotation shaft of the servo motor;
A vibration test apparatus.

A plurality of the rollers;
The vibration test apparatus according to claim 1, wherein a pair of rollers included in the plurality of rollers are arranged so as to sandwich a thread of the square screw.

The vibration test apparatus according to claim 2, further comprising a biasing unit that biases the pair of rollers toward the crest of the square screw.

The connecting member has a roller support plate to which the shafts of the pair of rollers are fixed;
The roller support plate has a slot formed between the pair of rollers;
The urging means adjusts a distance between the pair of rollers and a load for urging the pair of rollers toward the crest of the square screw by adjusting a gap between the slit grooves. The vibration test apparatus according to claim 3.

The biasing means is
A first through hole that is drilled from one end of the roller support plate toward the slit;
A second through hole that is perforated from one end of the roller support plate toward the slit and has an internal thread formed on the inner periphery;
A female screw hole facing the first through hole through the slit and extending toward the other end of the roller support plate;
A first bolt that passes through the first through hole and is screwed into the female screw hole;
A second bolt screwed into the second through hole,
The head of the first bolt presses one end of the roller support plate to apply a load in a direction that narrows the width of the slit groove, and the tip of the second bolt is applied to the roller The vibration test apparatus according to claim 4, wherein a load in a direction in which the other end of the support plate is pressed to increase the width of the slit groove is applied to the roller support plate.

Portion of at least square thread of said input shaft, said roller and said output shaft, characterized in that it is housed in a casing filled with lubricating oil, according to any one of claims 1 5 Vibration test equipment.

An oil seal for preventing leakage of lubricating oil is provided between an opening for allowing the input shaft and the output shaft to pass through in the casing, and the input shaft and the output shaft. The vibration test apparatus according to claim 6.

A linear motion converter that converts rotational motion into linear motion,
Frame,
An input shaft rotatably supported with respect to the frame;
A square screw formed on at least a part of the outer peripheral surface of the input shaft;
A roller unit in which a rotating shaft that rotatably supports a roller having a cylindrical surface that abuts against the flank of the square screw via a cylindrical roller bearing that is substantially entirely accommodated in the valley of the square screw; ,
A rail fixed to the frame for sliding the roller unit so as to be slidable along the axial direction of the square screw;
An output shaft connected directly or indirectly to the roller unit;
With
As the input shaft rotates, the roller engaged with the square screw moves along the screw groove of the square screw, and the roller unit moves linearly along the rail. A linear motion converter characterized in that the output shaft also moves linearly.

The linear motion converter according to claim 8, wherein a plurality of the rollers are provided, and a pair of rollers included in the plurality of rollers are disposed so as to sandwich a thread of the square screw.

The linear motion converter according to claim 9, further comprising a biasing unit that biases the pair of rollers toward the crest of the square screw.

The roller unit has a slit formed between the pair of rollers;
The biasing means adjusts a distance between the pair of rollers and a load for biasing the pair of rollers toward the crest of the square screw by adjusting a gap between the slit grooves. The linear motion converter according to claim 10.

The biasing means is
A first through hole that is drilled from one end of the roller unit toward the slit;
A second through hole that is perforated from one end of the roller unit toward the slit and has an internal thread formed on the inner periphery;
A female screw hole facing the first through hole through the slit and extending toward the other end of the roller support plate;
A first bolt that passes through the first through hole and is screwed into the female screw hole;
A second bolt screwed into the second through hole;
Have
The head of the first bolt presses one end of the roller unit to apply a load in a direction that narrows the width of the slit groove, and the tip of the second bolt is connected to the roller unit. The linear motion converter according to claim 11, wherein a load in a direction of expanding the width of the slit groove by pressing the other end is applied to the roller unit.

The frame includes a casing body that houses the square screw, the roller unit, and the rail;
The linear motion converter according to claim 8, wherein the casing body is filled with lubricating oil.

A linear motion actuator comprising: the linear motion converter according to any one of claims 8 to 13; and a power device that can reversely drive an input shaft of the linear motion converter.

The linear actuator according to claim 14, wherein the power unit is a motor.

The linear motion actuator according to claim 15, wherein the motor is a servo motor.

In a vibration testing apparatus that drives a table fixed to the output shaft of a linear actuator and vibrates a test object held on the table,
The vibration testing apparatus according to claim 14, wherein the linear motion actuator is the linear motion actuator according to claim 14.