JP2534650Y2 - Sealing device for rotary actuator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for a rotary actuator.

[0002]

2. Description of the Related Art In general, a rotary actuator includes a rotor a (shaft) and a casing b into which the rotor a is inserted, as shown in FIG. They rotate relatively.

That is, as shown in FIG. 7, a pair of projections d, d arranged symmetrically with respect to the axis are projected from an outer peripheral surface c of a rotor a, and an inner peripheral surface of a casing b. e
, A pair of protrusions f, f arranged at symmetrical positions with respect to the axis are projected.

[0004] Thus, the cylinder chamber g ₁ between the rotor a and the casing _{b, g 2, g 3,} g 4 will be is formed, the cylinder chamber g _1, g ₃ is the same pressure, the cylinder chamber g ₂ and g ₄ are set to the same pressure. That is, the casing b
When the fluid is supplied to the cylinder chambers g ₁ and g ₃ and the fluid in the cylinder chambers g ₂ and g ₄ is discharged, the rotor a rotates in the direction of the arrow h, and conversely, the cylinder chamber g cylinder chamber g ₁ supplies fluid into _2, g _4,
If caused to discharge the fluid in g _3, the rotor a is rotated in the direction of arrow i.

Therefore, the projections d, d and the projections f, f
Respectively grooves k ... provided, each groove k ... a sealant m ... fitted in, were each cylinder chamber _{g 1, g 2, g 3} , g 4 and sealingly.

The groove k has a U-shape as a whole as shown in FIG. 8, and a conventional sealing material is formed by cutting an O-ring into a rod shape, and the whole shape is a U-shape. It was fitted along the groove k.

[0007]

Therefore, as shown in FIG. 8, at the corner portions n, n of the groove k, it is difficult to bend at a right angle with the conventional sealing material and to attach it accurately, and it is difficult to completely attach the sealing material. And the fluid leakage was large.

[0008] Therefore, an object of the present invention is to provide a seal device for a rotary actuator in which fluid leakage can be extremely reduced.

[0009]

In order to achieve the above-mentioned object, one sealing device for a rotary actuator according to the present invention comprises a casing and a rotor inserted into the casing.
A sea <br/> Le device mounted to a rotary actuator comprising a motor, shaped in and the overall shape of a T consisting of a protrusion which is protruded from the cross-section a rectangular base and base portion But
The top of the protrusion is formed of the above-described casing.
The outer peripheral surface of the rotor projects so as to press against the inner peripheral surface of the rotor.
When fitted into the U-shaped groove provided in the
, A pair of plate-shaped backup pieces whose overall shape is a U-shape
And the upper surface of the base of the elastic seal body or the side surface of the protrusion.
Fit into the gaps formed by the side surfaces of the concave grooves, respectively.
The projecting portion of the elastic seal is connected to the pair of plate-like backers.
It is interposed between top pieces. Also, other rotary
The seal device for the actuator includes a casing and the case.
Rotor having a rotor inserted into the rotor
A seal device that is mounted on a
T-shaped section consisting of a base and a protrusion protruding from the base
And the whole shape is a U-shaped elastic seal body,
Make sure that the top is pressed against the outer peripheral surface of the rotor.
Overall U-shape provided on the protrusion on the inner peripheral surface of the shing
And a pair of U-shaped
Place the plate-shaped backup piece on the base of the elastic seal body.
A gap formed between the surface or the side surface of the protrusion and the side surface of the concave groove
Parts, respectively, and the protrusions of the elastic seal body are
It is interposed between a pair of plate-shaped backup pieces.
You.

[0010]

Since the entire shape of the elastic seal is U-shaped, when the sealing device is fitted into the U-shaped groove, the top of the elastic seal is pressed against the mating side even at the groove corner. I do.

Since the protrusion of the elastic seal is interposed between the backup pieces, the protrusion of the elastic seal is less likely to fall over.
The top of the protrusion does not protrude from the groove.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

4 and 5 show a rotary actuator in which the sealing device S according to the present invention is used. The rotary actuator includes a rotor 1 and a casing 2 into which the rotor 1 is inserted. And casing 2
Are relatively rotated around the axis.

That is, a pair of protrusions 4 and 4 disposed symmetrically with respect to the axis are projected from the outer peripheral surface 3 of the rotor 1, and symmetrically with respect to the axial center on the inner peripheral surface 5 of the casing 2. A pair of protruding portions 6, 6 disposed at the positions protrude.

Accordingly, four cylinder chambers 7a, 7b, 7c, 7d are formed between the rotor 1 and the casing 2, and the cylinder chambers 7a, 7c are set to the same pressure, and the cylinder chambers 7b, 7d are formed. The same pressure is set. That is, if the fluid is supplied to the cylinder chambers 7a and 7c and the fluid in the cylinder chambers 7b and 7d is discharged while the casing 2 is fixed, the rotor 1 rotates in the direction of arrow A, and conversely, the cylinder chamber 7b , 7d and the cylinder chamber 7
When the fluids a and 7c are discharged, the rotor 1 rotates in the direction of arrow B.

Each of the projections 4, 4, 6, 6 has a groove 8
Are formed, and the sealing device S according to the present invention is fitted in the groove 8, and the cylinder chambers 7a, 7b, 7c, 7d are sealed. In this case, the groove 8 has a U-shape as shown in FIG.

As shown in FIG. 2, the sealing device S has a U-shaped elastic seal body 10 as shown in FIG. 2 and a pair of U-shaped plate-shaped backup members as shown in FIG. Pieces 11, 11 are provided.

The elastic seal body 10 is made of an elastic material such as rubber or soft plastic, and includes a linear main body 10a and legs 10b, 10b protruding from an end of the main body 10a. The axis of the legs 10b, 10b is orthogonal to the axis of the main body 10a.

As shown in FIG. 1, the elastic seal body 10 includes a base 12 having a rectangular cross section and a protrusion 13 projecting from the base 12, and has a T-shaped cross section. ing.
The top 14 of the projection 13 has a semicircular cross section.

The backup piece 11 is made of a synthetic resin such as PTFE, polyacetal, polyimide, and ultrahigh molecular weight polyethylene. As shown in FIG. 3, a linear main body 11a and an end of the main body 11a are provided. Protruding legs 11b,
11b, the axis of the legs 11b, 11b and the main body 11a.
Is perpendicular to the axis. In addition, a chamfered portion 18 is formed at the end of the outer surface 17 of the backup piece 11 on the sliding contact surface M side.

[0021] Then, as shown in FIG. 1, Ru projection 13 of the elastic sealing member 10 between a pair of backup pieces 11, 11 is interposed. That is, on the base 12 of the elastic seal body 10
And the side surface 15 of the protrusion 13 and the side surface of the concave groove 8.
This backup piece 11 is fitted into the
Between the pair of plate-like backup pieces.
It is interposed in. In this case, the top part 14 of the elastic seal body 10 protrudes from the backup pieces 11 and 11.
More specifically, the protrusion 1 is larger than the width W of the backup piece 11.
3 is set to be large, and the thickness T of the backup piece 11 is changed from the side surface 15 of the protrusion 13 to the side surface 1 of the base 12.
6, the depth D of the groove 8 in which the sealing device S is to be mounted is substantially equal to the sum of the thickness F of the base 12 and the width W of the backup piece 11. The width H of the base 12 is set to be smaller than the width G of the groove 8, and the width I (thickness) of the protrusion 13 is about half of the width H between the sides.

The length L ₁ of the elastic seal body 10 and the length L ₂ of the backup piece 11 in the free state shown in FIGS. 2, 3 and 5 are slightly smaller than the length L ₃ of the groove 8. Is set to long. In addition, it is important to give the elastic seal body 10 a constant crushing rate.

Therefore, when the sealing device S is mounted in the groove 8, as shown in FIG.
13 is compressed, the top portion 14 is pressed against the mating sliding contact surface M (that is, the outer peripheral surface 3 of the rotor 1 or the inner peripheral surface 5 of the casing 2), and the elastic seal body 10 has an overall U-shape. , and the and the length dimension L ₁ of the resilient sealing member 10 in a free state is set to be longer than the length L ₃ of the groove 8, the elastic seal member 10 is compressed longitudinally, back up to pressurization There is a chamfered portion 18 provided to prevent the piece 11 from protruding, and it is possible to surely prevent fluid leakage, and each of the cylinder chambers 7a, 7b, 7c, 7d is maintained in a sealed state. No fluid leaks from the chambers 7a, 7b, 7c, 7d.

The present invention is not limited to the above-described embodiment, and the design can be freely changed without departing from the gist of the present invention.
₁ , the protrusion dimension C of the protrusion 13, the side-to-side dimension (thickness dimension) I of the protrusion 13, the side-to-side dimension G of the base 12, and the like can be freely changed. L ₂ , width dimension W, thickness dimension T, etc.
Can be changed freely in accordance with.

[0025]

Since the present invention is configured as described above, the following effects can be obtained.

Since the entire shape of the elastic seal body 10 is U-shaped, the top 14 of the protrusion 13 of the elastic seal body 10 is securely pressed against the mating side even at the corner portion 19 of the groove 8, and an extremely excellent sealing effect is obtained. Demonstrate.

Even during operation of the rotary actuator, the backup pieces 11, 11 prevent the elastic seal body 10 from falling down, and the top portion 14 is always in pressure contact with the sliding surface M on the other side. The protrusion of the portion 13 is prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of the present invention.

FIG. 2 is a front view of an elastic seal body.

FIG. 3 is a front view of a backup piece.

FIG. 4 is a sectional view of a rotary actuator.

FIG. 5 is a sectional view of a main part of the rotary actuator.

FIG. 6 is an operation explanatory view.

FIG. 7 is a cross-sectional view of a rotary actuator using a conventional sealing device.

FIG. 8 is a sectional view of a main part of a rotary actuator.

[Explanation of symbols]

 10 Elastic seal 11 Backup piece 12 Base 13 Protrusion 14 Top

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Motohiro Hashimoto 663 Minoshima, Arita-shi, Wakayama Mitsubishi Cable Industry Co., Ltd.Minoshima Works (72) Inventor Fumio Iwamoto 1-10 Fuso-cho, Amagasaki-shi, Hyogo Sumitomo Precision Industries Inside the corporation

Claims (2)

(57) [Scope of request for utility model registration] 1. A casing and inserted into the casing
A <br/> seal device mounted to a rotary actuator comprising a rotor, is shaped in and the overall shape of a T consisting of a protrusion which is protruded from the cross-section a rectangular base and base portion
A U-shaped elastic seal is provided, and the top of the protrusion is
The outer peripheral surface of the rotor is pressed against the inner peripheral surface of the rotor.
Fits into a U-shaped groove provided on the protrusion
At the same time, a pair of plate-shaped
Of the elastic seal body from the upper surface to the side surface of the protrusion.
And into the gap formed by the groove and the side surface of the groove, respectively.
Then, the protrusion of the elastic seal body is
A seal device for a rotary actuator, which is interposed between backup pieces . 2. A casing and inserted into the casing.
Attached to a rotary actuator with a rotor
A sealing device, comprising: a base having a rectangular cross section;
The cross-section T consisting of the projections provided and the overall shape is
A U-shaped elastic seal body is provided, and the top of the projection is the rotor
So that the inner peripheral surface of the casing is pressed against the outer peripheral surface of the casing.
Fits into a U-shaped groove provided on the protrusion
At the same time, a pair of plate-shaped
Of the elastic seal body from the upper surface to the side surface of the protrusion.
And into the gap formed by the groove and the side surface of the groove, respectively.
Then, the protrusion of the elastic seal body is
Rotary characterized by interposed between backup pieces
Sealing device for actuators.