JP2002130208A - Oscillating actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance accuracy of an oscillating actuator. SOLUTION: The table 2, mounting two angular-contact ball bearings 43, 44 as a ball-and-roller bearing by a table cap screw 42, is assembled pinchingly into an actuator body 1. Accordingly, with such a structure clamping force can be applied to the angular-contact bearings 43, 44 by the tightening torque of the table cap screw 42, and the table 2 can be reliably assembled, so that accuracy of the oscillating actuator can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillating actuator, and more particularly to a technique which is effective when applied to a rack and pinion oscillating actuator.

[0002]

2. Description of the Related Art A swing type actuator is provided with a vane for receiving a pressure of a working fluid on a rotating shaft accommodated in a cylindrical casing, and a vane for rotating the vane by introducing the working fluid into the casing. A piston-type rocking actuator, a piston-type rocking actuator that converts a linear reciprocating motion of a piston that operates in the axial direction by introducing a working fluid into a cylinder chamber into a rocking reciprocating motion by a rotation conversion mechanism, a rocking shaft and a piston There is a screw-type rocking actuator that converts a linear reciprocating motion of a piston operating in the axial direction into a rocking reciprocating motion via a screw thread by screw-connecting the two.

There is a rack and pinion type rocking actuator as a kind of piston type rocking actuator. However, there are few leakage points of working fluid, which is suitable for long-time position holding, and a rocking angle can be set to be large. Widely used.

A pinion is rotatably supported on the actuator body of the rack-and-pinion type swing actuator, and two cylinder chambers formed in parallel are provided on both sides of the pinion. In each of the cylinder chambers, a pair of racks provided so as to be able to linearly reciprocate in the axial direction are meshed with a pinion. Pistons are attached to both ends of the rack to form two fluid pressure chambers in the cylinder chamber. When the working fluid is supplied to one of the fluid pressure chambers, the rack receives the pressure of the working fluid and linearly moves toward one of the cylinder chambers, and when the working fluid is supplied to the other fluid pressure chamber, the rack moves toward the other within the cylinder chamber. Make a linear motion. Therefore, when the working fluid is alternately supplied to both of the fluid pressure chambers, the rack reciprocates linearly, and the pinion meshed with the rack rotates and swings.

[0005] A table is connected to the pinion that rotates and swings, and the table also rotates and swings when the pinion rotates and swings.

A work and a jig are mounted on a table of a rack and pinion type swing actuator having such a structure, and a working fluid is alternately supplied to both fluid pressure chambers. A predetermined work can be performed by rotating and oscillating a device such as a tool.

[0007]

The rack-and-pinion type oscillating actuator is used in various production lines and the like, but further improvement in accuracy is required to improve productivity and quality.

In order to smoothly swing the swinging member, a rolling bearing is used for the swinging member supporting portion of the actuator body. The actuator body and the swing member are attached by fixing the inner ring side of the rolling bearing to the swing member and fixing the outer ring side to the actuator body. Therefore, the rocking member has a play in the thrust direction, particularly in the thrust direction, within the range of the accuracy of the rolling bearing with respect to the actuator body, which is an obstacle to the improvement of the accuracy of the rocking actuator.

An object of the present invention is to improve the accuracy of a swing type actuator.

[0010]

SUMMARY OF THE INVENTION An oscillating actuator according to the present invention has a table portion, a shaft portion having a smaller diameter than the outer diameter of the table portion, and a oscillating member driven by a working fluid; An actuator body for supporting the swing member so as to be capable of swinging reciprocation; a first rolling bearing provided on one surface of the actuator body for supporting a root side of the shaft portion of the swing member; A second rolling bearing provided on the other surface of the main body and supporting a distal end side of the shaft portion of the rocking member, and a table holding screw screwed into the distal end side of the shaft portion of the rocking member. The swing member and the actuator main body are separated from each other by the first and second
It is characterized in that the rolling bearing is mounted with the rolling bearing sandwiched therebetween.

The oscillating actuator according to the present invention includes a piston mounted in a fluid pressure chamber formed in the actuator body so as to be reciprocally movable in an axial direction, a rack formed in the piston, and meshing with the rack. And a pinion formed on the swing member.

In the swing type actuator according to the present invention, the first and second rolling bearings are preferably angular bearings.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIGS. 1 (a) and 1 (b) are perspective views showing an oscillating actuator according to an embodiment of the present invention. An actuator body 1 has a substantially rectangular parallelepiped shape. A circular table 2 as a swinging member is provided on the upper part. By mounting devices such as works and jigs on the table 2, the devices such as works and jigs are rotated and oscillated, and predetermined work can be performed by positioning them.

FIG. 2 is a sectional view showing an AA section of the oscillating actuator shown in FIG. 1A, and FIG. 3 is a sectional view showing a BB section shown in FIG.

A pinion 3 integrally formed with the table 2 is rotatably supported on the actuator body 1 shown in FIG. 2, and two cylinder chambers 4 and 5 are formed in parallel on both sides of the pinion 3. Have been.

Both ends of the cylinder chamber 4 have O
It is closed by fixing end plates 6 and 7 having rings 6 a and 7 a with snap rings 8 and 9. Similarly, both ends of the cylinder chamber 5 also have O
End plate 10, 1 having rings 10a, 11a
1 is fixed by the snap rings 12 and 13 so as to be closed.

The two cylinder chambers 4 and 5 are provided with a pair of racks 14 and 15 meshed with the pinion 3 so as to be slidable in the axial direction, respectively. When the pinion 3 reciprocates linearly in the direction in which the pinion 3 moves, the pinion 3 reciprocates.

Inside the racks 14 and 15, magnets 20 and 21 supported by magnet retainers 16 and 17 and O-rings 18 and 19, respectively, are mounted, and the racks 14 and 15 respond to the magnetic force of the magnets 20 and 21. , 15
A sensor (not shown) for detecting that the position is at the end of the stroke is mounted in the sensor mounting grooves 22 and 23 shown in FIGS. 1 (a) and 1 (b).

The magnets 20 and 21 can be detached or attached to only one of the racks according to the intended use of the swing type actuator.

Each end of the rack 14 has a piston 2
4 and 25 are attached, and two fluid pressure chambers 4 a and 4 b are formed in the cylinder chamber 4. Note that seal members 24a, 25
a is provided.

Similarly to the rack 14, pistons 26 and 27 provided with seal members 26a and 27a are attached to both ends of the rack 15, respectively, and two fluid pressure chambers 5a and 5b are formed in the cylinder chamber 5. are doing.

The working fluid supply / discharge ports 28, 29 opened to the fluid pressure chambers 4b, 5a are supplied / discharged to a working fluid supply source (not shown) by a working fluid supply / discharge flow path 30 provided in the actuator body 1. The working fluid is supplied to the supply / discharge port 31 through the fluid pressure chamber 4.
The working fluid simultaneously flows into b and 5a. The working fluid simultaneously flowing into the fluid pressure chambers 4b and 5a pushes the pistons 25 and 26 in the axial direction, respectively,
The rack 14 linearly moves leftward in the drawing, and the rack 15 linearly moves rightward in the drawing, and rotates the pinion 3 counterclockwise in the drawing.

The fluid pressure chambers 4a, 5b are
The working fluid supply / discharge ports 32 and 33 indicated by two-dot chain lines are provided on the side opposite to the side shown in FIG. The working fluid supply / discharge ports 32, 33 are provided with a working fluid supply / discharge flow path 34 shown in FIG.
Thus, the working fluid is connected to the supply / discharge port 35 shown in FIG. 1B, and the working fluid flows into the fluid pressure chambers 4a and 5b at the same time by supplying the working fluid to the supply / discharge port 35.

When the working fluid simultaneously flowing into the fluid pressure chambers 4a and 5b pushes the pistons 24 and 27 in the axial direction, the rack 14 linearly moves rightward in the drawing and the rack 15 linearly moves leftward in the drawing, and the pinion moves. 3 is rotated clockwise in the figure.

Therefore, by alternately supplying the working fluid to the fluid pressure chambers 4b, 5a and the fluid pressure chambers 4a, 5b, the racks 14, 15 reciprocate linearly in the axial direction, and the pinion 3 swings and reciprocates. can do.

The working fluid supply / discharge passage 30 has supply / discharge ports 36, 37, 38 in addition to the supply / discharge port 31, and the respective supply / discharge ports 36, 37, 38 are shown in FIG. ,
(B) and plugs 36a, 37a, 38 as shown in FIG.
It is closed at a. Similarly, the working fluid supply / discharge channel 34 has supply / discharge ports 39, 40, 41 in addition to the supply / discharge port 35, and the respective supply / discharge ports 39, 40, 41.
Are closed by plugs 39a, 40a, 41a.
In the present embodiment, the case where the supply / discharge ports 31 and 35 are connected to the working fluid supply source and the other supply / discharge ports are closed with plugs is shown. One of the supply / discharge ports is connected to a working fluid supply source, and the remaining supply / discharge ports are closed with plugs, respectively. Can be changed.

Therefore, by connecting a working fluid supply source to an arbitrary supply / discharge port, the degree of freedom of installation of the swing type actuator is increased.

As shown in FIG. 3, the table 2 and the shaft 2a constituting the swinging member are formed integrally with each other.
Is provided with a pinion 3. Pinion 3 is the key,
It is possible to secure strength and rigidity because it is integrated with the table 2 without requiring a connection mechanism such as press-fitting, bonding, screw fastening, and pins, and because the space for the connection mechanism is not required, the pinion 3 and the table are not required. The actuator body 1 can be made smaller than when the actuator body 2 and the actuator body 2 are separately provided.

The table 2 has a table holding screw 42
Accordingly, the two angular bearings 43 and 44 as rolling bearings are attached to the actuator main body 1 so as to sandwich them. With such a structure, the preload can be applied to the angular bearings 43 and 44 by the tightening torque of the table holding screw 42, and the table 2 can be securely mounted.

A rolling bearing is a rolling bearing in which a rolling element is inserted between an inner ring and an outer ring so as to make rolling contact to reduce friction loss. Angular bearings 43 and 44 which are a kind of rolling bearing are used as rolling elements. Ball 43a,
Using balls 44a, balls 43a, 44a and inner rings 43b, 44
b, The contact surfaces with the outer rings 43c and 44c have a certain contact angle. Therefore, when a preload, that is, a fastening force is applied to the angular bearings 43, 44 by the tightening torque of the table holding screw 42, this preload is dispersed in the thrust direction and the radial direction of the angular bearings 43, 44, so that the tightening torque is reduced. Concentrating in the direction can prevent the bearing from being damaged. A spring washer 45 for preventing the table holding screw 42 from loosening is incorporated between the table holding screw 42 and the angular bearing 43.

A stopper 46 made of a columnar member having a circular cross section is attached to the table 2 which is formed integrally with the pinion 3 and swings and reciprocates integrally with the pinion 3 so as to swing and reciprocate integrally with the table 2. It has become.

FIG. 4 is a cross-sectional view taken along the line CC of FIG. 3. As shown in FIG. 4, shock absorbers 47 and 48 whose details are shown in FIG. Regulating surfaces 5 provided at the distal ends of rods 49 and 50 as swing range regulating members mounted so as to be able to move forward and backward in the axial direction of shock absorbers 47 and 48.
At the end of the swing stroke of the table 2, reference numerals 1 and 52 abut against the contact surface 53 of the cylindrical body of the stopper 46.

FIG. 5 is a sectional view showing details of the shock absorber. As shown in FIG.
A piston ring 55 is provided slidably in the axial direction in an oil chamber 54 a provided in the shock absorber main body 54, and the piston ring 55 is connected to a first piston 56 attached to one end of a rod 49 and a first piston 56. It is fitted into a groove formed between the two pistons 57 and is reciprocally movable in the axial direction within the range of the groove. The rod 49 is supported by a stopper holder 58 provided at one end of the shock absorber main body 54, and is movable in and out of the shock absorber main body 54.

The rod 49 is normally held in a direction in which the rod 49 is projected from the shock absorber main body 54 by the spring force of a spring 59 provided in the oil chamber 54a toward the second piston 57. When an external force is applied to the rod 49 and the rod 49 contracts into the shock absorber main body 54, the piston ring 55 is pushed by the first piston 56 and moves in the oil chamber 54a rightward in the drawing. At this time, the oil filled in the oil chamber 54a flows through the gap between the contact surfaces of the first piston 56 and the piston ring 55, thereby generating resistance.
An oil chamber 5 is provided by an accumulator 60 provided at one end of the oil chamber 5.
The function as a shock absorber is exhibited by absorbing the pressure in 4a.

The shock absorber 48 has the same structure and function as the shock absorber 47.

Stopper 4 that rotates and swings together with table 2
6 rotates clockwise, and when the contact surface 53 contacts the regulating surface 51, the rod 49 contracts into the shock absorber 47 while absorbing the rotational energy of the table 2 and stops the table 2 at the end of the swing stroke. Similarly, when the stopper 46 rotates counterclockwise and comes into contact with the regulating surface 52, the rod 50 contracts into the shock absorber 48 while absorbing the rotational energy of the table 2, and stops the table 2 at the end of the swing stroke. .

Therefore, the table 2 has the rods 49, 5
The swing range is limited by 0, and positioning is performed at the end of the swing stroke.

The shock absorbers 47 and 48 have threads 61 and 62 on the outer peripheral portion of the main body, respectively. The shock absorbers 47 and 48 are screwed into the screw holes 63 and 64 for mounting the swing range regulating member provided in the actuator main body 1 and are hex nuts 65. , 66 are fixed. By loosening the hexagon nuts 65 and 66 and adjusting the screwing amounts of the shock absorbers 47 and 48, the operating range and the stop position of the table 2 can be adjusted.

(Embodiment 2) FIG. 6 is a cross-sectional view showing the structure of an oscillating actuator according to another embodiment of the present invention, which is used when a large output is not required. .

Like the actuator body 1 shown in FIG. 2, a pinion 3 is rotatably supported on the actuator body 1 shown in FIG. 6, and cylinder chambers 4 formed in parallel on both sides of the pinion 3 are provided. , 5 are provided with a pair of racks 14 and 15 engaged with the pinion 3 so as to be slidable in the axial direction, respectively. The racks 14 and 15 reciprocate linearly in the cylinder chamber, whereby the pinion 3 swings. It reciprocates.

Pistons 24, 25 provided with seal members 24a, 25a are attached to both ends of the rack 14, respectively, and two fluid pressure chambers 4 are provided in the cylinder chamber 4.
a, 4b are formed. Rack 15 to Rack 14
, A piston is not attached, and is driven to follow the rack 14 via the pinion 3.

The working fluid supply / discharge ports 67, 68 opened to the fluid pressure chambers 4a, 4b communicate with supply / discharge ports 69, 70 connected to a working fluid supply source (not shown). By supplying the fluid, the working fluid flows into the fluid pressure chamber 4a. Fluid pressure chamber 4a
The rack 14 linearly moves rightward in the drawing when the working fluid flowing into the piston pushes the piston 24 in the axial direction, and rotates the pinion 3 clockwise in the drawing. At this time, the rack 15 driven to follow the rack 14 via the pinion 3
Moves linearly to the left in the figure, and is moved by a magnet 21 supported and mounted on the magnet holder 16 and the O-ring 18 inside the rack 15 and a sensor switch (not shown) mounted on the sensor mounting groove 22 of the actuator body 1. It is possible to detect that 15 has reached the position of the stroke end.

Similarly, by supplying the working fluid to the supply / discharge port 70, the working fluid flows into the fluid pressure chamber 4b, and the working fluid flowing into the fluid pressure chamber 4b moves the piston 25 in the axial direction. , The rack 14 linearly moves leftward in the drawing, and rotates the pinion 3 counterclockwise in the drawing. At this time, the rack 14 is connected via the pinion 3.
Is driven linearly in the right direction in the figure.

Therefore, the fluid pressure chambers 4a and 4b
The working fluid is supplied alternately to the
Reciprocates linearly in the axial direction, and the pinion 3 can swing and reciprocate.

Although the invention made by the present inventor has been specifically described based on the embodiment, the invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention. Needless to say,

For example, the actuator body 1 is not limited to the rack and pinion type swing actuator as shown in FIG. 2, but may be a vane type swing actuator or a crank type swing actuator.

[0048]

According to the present invention, the table is mounted on the actuator body in such a manner that the two angular bearings as rolling bearings are sandwiched by the table holding screws, so that the tightening force of the table holding screws is applied to the angular bearings. Can be added, and the table can be securely mounted, so that the accuracy of the swing type actuator can be improved.

[Brief description of the drawings]

FIGS. 1A and 1B are perspective views showing an oscillating actuator according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an AA section of the oscillating actuator shown in FIG. 1;

FIG. 3 is a cross-sectional view showing a cross section taken along line BB of the swing type actuator shown in FIG. 2;

FIG. 4 is a cross-sectional view showing a cross section taken along line CC of the oscillating actuator shown in FIG. 3;

FIG. 5 is a sectional view showing details of a shock absorber shown in FIG. 4;

FIG. 6 is a cross-sectional view showing a structure of an oscillating actuator according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Actuator main body 2 Table 2a Shaft part 3 Pinion 4 Cylinder chamber 4a, 4b Fluid pressure chamber 5 Cylinder chamber 5a, 5b Fluid pressure chamber 6, 7, 10, 11 End plate 6a, 7a, 10a, 11a O-ring 8, 9, 12, 13 Snap ring 14, 15 Rack 16, 17 Magnet press 18, 19 O-ring 20, 21 Magnet 22, 23 Sensor mounting groove 24, 25, 26, 27 Piston 24a, 25a, 26a, 27a Seal member 28, 29, 32, 33 Working fluid supply / discharge port 30, 34 Working fluid supply / discharge flow path 31, 35, 36, 37, 38, 39, 40, 41 Supply / discharge port 36a, 37a, 38a, 39a, 40a, 41a Plug 42 Table holder Screw 43,44 Angular bearing 43a, 44a Ball 43b, 44b 43c, 44c Outer ring 45 Spring washer 46 Stopper 47, 48 Shock absorber 49, 50 Rod 51, 52 Restriction surface 53 Contact surface 54 Shock absorber body 54a Oil chamber 55 Piston ring 56 First piston 57 Second piston 58 Stopper holder 59 Spring 60 Accumulators 61, 62 Threads 63, 64 Screw holes for mounting swing range restricting members 65, 66 Hex nuts 67, 68 Working fluid supply / discharge port 69, 70 Supply / discharge port

Claims (3)

[Claims] An oscillating member having a table portion, a shaft portion having a smaller diameter than the outer diameter of the table portion, a working fluid for oscillatingly supporting the oscillating member and pressurizing the oscillating member. And a first rolling bearing provided on the actuator body and supporting a root side of the shaft portion; and a second rolling bearing provided on the actuator body and supporting a tip side of the shaft portion. And a table holding screw that is screwed into the distal end side of the shaft portion and comes into contact with the second rolling bearing, wherein a fastening force is applied to each of the rolling bearings by the table holding screw. Swinging actuator. 2. The oscillating actuator according to claim 1, wherein the piston is reciprocally mounted in a fluid pressure chamber formed in the actuator body in an axial direction, a rack formed in the piston, and And a pinion meshed with a rack and formed on the rocking member. 3. The oscillating actuator according to claim 1, wherein said first and second rolling bearings are angular bearings.