JP3476542B2 - Guide mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide mechanism in which a roller member is used at a sliding portion of a machine part to reduce sliding resistance and to perform a smooth displacement operation.

[0002]

2. Description of the Related Art Conventionally, an actuator has been used for carrying a work or the like. This actuator is provided with a moving table that is displaced along the longitudinal direction of the frame that constitutes the outer frame, and by slidingly displacing the moving table via a guide mechanism, the work placed on the moving table is moved. Transporting.

The guide mechanism applied to the actuator is generally classified into a sliding bearing guide and a rolling bearing guide according to the contact state of the sliding surface. For example, a sliding bearing guide has a substantially square cross section. Alternatively, there is one in which a guide block having a substantially U-shaped cross section is slid along a long rail member formed in a rectangular shape.

As the rolling bearing guide, there is one in which a plurality of parts are connected to define a circulation passage and a plurality of balls are rolled along the circulation passage to displace the moving table.

Further, conventionally, a roller bearing such as a cylindrical roller bearing or a tapered roller bearing using a roller member as a rolling element has been used in a portion supporting a rotary shaft such as a motor shaft. This roller bearing is suitably used when supporting a heavy load in a radial direction and / or a thrust direction of a shaft body that performs rotary motion.

[0006]

However, in the sliding bearing guide according to the above-mentioned prior art, since the sliding portions of the rail member and the guide block are in surface contact with each other, the sliding resistance is large, and the sliding portion is large. However, there is an inconvenience that it is easily worn and looseness occurs.

On the other hand, in the rolling bearing guide, the circulation passage through which the ball rolls must be formed by a plurality of parts, which increases the manufacturing cost and prevents the formed circulation passage from being stepped. There is the inconvenience of having to connect individual parts.

The present invention has been made in order to overcome the above-mentioned inconvenience, and by applying the roller bearing to a member that performs linear motion such as an actuator, sliding resistance is reduced to reduce friction, Moreover, it is an object of the present invention to provide a guide mechanism that can reduce the manufacturing cost with a simple structure.

[0009]

In order to achieve the above-mentioned object, the present invention has a shape that extends linearly and is substantially orthogonal to each other.
First sliding surface and second sliding surface formed and the second sliding surface
Formed by inclining from the first sliding surface side by a predetermined angle
The third guide rail having a sliding surface, a guide block slidably displaced along said guide rail, fixed to an inner wall surface of the guide block, the first to third sliding surface of the guide rail to be The first to third sliding plates defining long grooves each having a substantially arcuate cross section facing each other, and the first to third sliding plates .
3 a substantially cylindrical roller member rotatably mounted in the long groove of the sliding plate, the roller member being provided in non-contact with the guide block, and the outer periphery of the roller member protruding from the long groove. Part of the part is the first to the first of the guide rails .
The roller member rolls by coming into contact with each of the three sliding surfaces.

[0010]

[Action] In the above guide mechanism according to the present invention, has a first to third sliding plate fixed to the inner wall surface of the guide block, each other wherein the first to third sliding plate, the guide rail A first sliding surface and a second sliding surface formed substantially orthogonal to each other
From the moving surface and the second sliding surface toward the first sliding surface side
Long grooves each having a substantially arcuate cross-section facing the third sliding surface formed by being inclined at a predetermined angle are defined , and a substantially columnar roller member is rotatably mounted in the long grooves. The roller member is provided in non-contact with the guide block, and a part of an outer peripheral portion of the roller member protruding from the long groove is brought into contact with each of the first to third sliding surfaces of the guide rail, so that the roller member The member rolls. Therefore, the guide block is smoothly displaced along the guide rail while rolling the roller member.

Therefore, the sliding resistance at the sliding portion between the guide rail and the member is reduced, and the frictional resistance is reduced.

Further, by forming all or a part of the sliding plate or the roller member with an elastic body, the vibration generated at the sliding portion is absorbed and the guide block is smoothly displaced. .

[0013]

Preferred embodiments of the guide mechanism according to the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of a guide mechanism according to an embodiment of the present invention, and FIG. 2 is a partial perspective view of the guide mechanism applied to an actuator.

The actuator 10 has a frame 16 having a plurality of fluid passages 12a to 12d penetrating in the longitudinal direction and grooves 14a and 14b, and side surfaces of the frame 16 facing each other via the grooves 14a and 14b. A pair of detachable side covers 18a, 1
8b and end covers 20a, 20b mounted on both ends of the frame 16 in the longitudinal direction, respectively.

A guide mechanism 24 including a pair of guide rails 22a and 22b provided integrally with the frame 16 is provided on the upper surface of the frame 16 along the longitudinal direction. A motor 26 is fixedly installed between the pair of guide rails 22a and 22b, and the driving force of the motor 26 is transmitted to the ball screw 30 via a block body 28 having a driving force transmission mechanism (not shown). . Ball screw 3
One end of 0 is rotatably supported by the support block 32.

A ball screw 30 is screwed between the block body 28 and the support block 32.
A moving table 34 that is displaced in the direction of arrow X or Y is provided under the rotating action of, and a guide block 36 that constitutes the guide mechanism 24 is fixed to the bottom surface of the moving table 34.

As shown in FIG. 1, the guide mechanism 24 surrounds a pair of substantially parallel guide rails 22a (22b) bulged on the upper surface of the frame 16 and the guide rails 22a (22b). Guide block 36 having an opening 38 defined therein, and the guide rail 22a.
The first to third sliding plates 40, 42, 44 which are interposed between the (22b) and the guide block 36 and are defined by long grooves 38a to 38e having a substantially arcuate cross section with a predetermined gap therebetween.
, Substantially cylindrical roller members 46a to 46e rotatably mounted in the long grooves 38a to 38e, and screw holes 50 on both end surfaces along the longitudinal direction of the guide block 36 via screws 50, respectively. A pair of end plates 52 mounted
a and 52b.

The side surfaces of the guide rails 22a (22b) are first and second sliding surfaces 5 which are formed substantially orthogonal to each other.
4 and 56, and a third sliding surface 58 that is formed by inclining from the second sliding surface 56 by a predetermined angle. The first to third sliding surfaces 5 of the guide rail 22a (22b)
A gap is formed between 4, 56, 58 and the inner wall surface of the opening 38 of the guide block 36 so as to be separated by a predetermined distance. A recess for holding the first to third sliding plates 40, 42, 44 is defined in the opening 38 of the guide block 36.

First to third sliding plates 40, 42, 44
Roller members 46a to 46e each having a substantially columnar shape are rotatably mounted in the plurality of long grooves 38a to 38e, and a part of an outer peripheral portion of each of the roller members 46a to 46e is a first to third sliding plate 40. , 42, 44 are formed so as to project outward from the sliding surface 47 by a distance A (see FIG. 2).

The first to third sliding plates 40, 42,
44 (hereinafter, if necessary, the first to third sliding plates 4
Materials for the roller members 46a to 46e will be described.

In FIG. 3A, the sliding plate 60 is formed of an elastic body such as synthetic resin, and the roller members 46a to 46e are formed of a metal material such as iron. In FIG. 3B, the sliding plate 6
The upper surface portion 62a of No. 2 is formed of an elastic body such as synthetic resin, and the lower surface portion 62b and the roller members 46a to 46e are formed of a metal material such as iron. In FIG. 3C, the upper surface portion 64a of the sliding plate 64 and the roller members 46a to 46e are formed of an elastic body such as synthetic resin, and the lower surface portion 64b is formed of a metal material such as iron. Thus, the sliding plates 60, 62, 6
4 or part thereof, or roller members 46a to 46
By forming e with an elastic body, the guide rail 22a
The vibration generated at the sliding portion with (22b) can be suitably absorbed by the elastic body.

The sliding plates 60, 62 and 64 are
Not only is it composed of ultra-high-molecular-weight polyethylene, but it is also a "Hostalen" issued by Hoechst.
As disclosed in "GUR topics", the long grooves 38a-3 are formed by forming a part or the whole of a crystal body of ultra-high molecular weight polyethylene, and including a lubricating oil, grease or the like.
Roller members 46a to 46e rotatably mounted in 8e
Can be smoothly rotated. Further, it is possible to form the sliding plates 60, 62, 64 so as to have a curved surface along the longitudinal direction so as to exhibit a self-centering function.

The guide mechanism 24 according to the embodiment of the present invention is
Basically, it is configured as described above, and its function and effect will be described below.

A motor 26 is driven by energizing a power source (not shown). The rotational driving force of the motor 26 is the block body 2
8 is transmitted to the ball screw 30 and the ball screw 3
The moving table 34 screwed to 0 is displaced in the arrow X or Y direction.

When the moving table 34 is displaced along the pair of guide rails 22a and 22b, the first to third sliding surfaces 54, 56 and 58 of the guide rails 22a and 22b are arranged.
And the plurality of roller members 46a to 46e roll. Therefore, the sliding resistance can be reduced and the frictional resistance can be reduced as compared with the conventional technique in which the guide block is in surface contact with the guide rail.

The guide mechanism 24 includes the first to third guide mechanisms.
Sliding plates 40, 42, 44 and the sliding plate 4
Since it is composed of a simple member composed of a plurality of roller members 46a to 46e rotatably mounted in the long grooves 38a to 38e of 0, 42, and 44, it can be easily manufactured and the manufacturing cost is reduced. It can be reduced.

Further, the pressing force (contact pressure) by the plurality of roller members 46a to 46e sliding on the first to third sliding surfaces 54, 56 and 58 of the guide rail 22a (22b) becomes substantially equal, The guide block 36 can be smoothly displaced.

The guide mechanism 24 according to this embodiment is
For example, it can be applied to various mechanical devices such as an electric servo actuator, a pneumatic actuator, and a rodless cylinder.

Next, the guide mechanism 2 according to the embodiment of the present invention.
FIG. 5 shows a state in which No. 4 is applied to another actuator 70.

In the actuator 70 shown in FIG. 5, a pair of guide rails 74 formed integrally with the frame 72.
2 is different from the actuator 10 shown in FIG. 2 in that the cross-sectional shapes of a and 74b are formed in a substantially square shape, but since the other configurations and operations are substantially the same as the actuator 10, the same constituent elements The same reference numerals are attached,
Detailed description thereof will be omitted.

As shown in FIG. 6, the guide rail 2
2a (22b) and the guy block 80, the first to third sliding surfaces 54, 5 of the guide rail 22a (22b).
A block body 82 surrounding 6 and 58 is interposed, and the first to third elastic bodies 84a to 84c are provided in the recesses of the block body 82.
It is also possible to mount the to absorb vibrations.

In addition, the guide mechanism 24 according to the embodiment of the present invention is provided with various actuators such as electric actuators proposed by the present applicant (see Japanese Patent Application No. 5-280124).
It is suitable to apply to.

[0034]

According to the guide mechanism of the present invention, the following effects can be obtained.

That is, the sliding resistance at the sliding portion between the guide rail and the member can be reduced to reduce the frictional resistance.

Further, since it is only necessary to rotatably mount the roller member on the sliding plate, it is possible to easily manufacture, and it is possible to reduce the manufacturing cost.

Further, by forming all or part of the sliding plate or the roller member with an elastic body,
The guide block can be smoothly displaced by absorbing the vibration generated in the sliding portion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a guide mechanism according to an embodiment of the present invention.

2 is a partially omitted exploded perspective view showing a state in which the guide mechanism of FIG. 1 is applied to an actuator.

FIG. 3 is an explanatory diagram showing a relationship between a sliding plate and a member.

FIG. 4 is an explanatory diagram showing a relationship between materials of a sliding plate and a member.

5 is a partially omitted exploded perspective view showing a state in which the guide mechanism of FIG. 1 is applied to another actuator.

6A and 6B are explanatory views of a guide mechanism in which an elastic body is provided between a guide block and a guide rail.

[Explanation of symbols]

10 ... Actuator 16 ... Frames 22a, 22b ... Guide rail 24 ... Guide mechanism 36 ... Guide block 38 ... Openings 38a-38e ... Long groove 40, 42,
44 ... Sliding plates 46a to 46e ... Roller members 52a, 52
b ... End plates 54, 56, 58 ... Sliding surface

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Shiomi 4-2-2 Kinunodai, Taniwahara-mura, Tsukuba-gun, Ibaraki SMC Corporation Tsukuba Technology Center (56) References JP 54-162052 (JP, A) ) Actual development Sho 59-73633 (JP, U) Actual development Sho 61-23522 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16C 29/04

Claims (2)

(57) [Claims] 1. Linearly extending and formed substantially orthogonal to each other.
From the first sliding surface and the second sliding surface and the second sliding surface
Is formed to be inclined at a predetermined angle toward the first sliding surface side.
A guide rail having a third sliding surface , a guide block slidably displaced along the guide rail, and fixed to an inner wall surface of the guide block, and attached to the first to third sliding surfaces of the guide rail . First to third sliding plates defining long grooves having substantially arcuate cross sections facing each other; and a substantially cylindrical roller member rotatably mounted in the long grooves of the first to third sliding plates. , wherein the roller member is provided on the guide block and the non-contact, it to the first to third sliding surface of part of the guide rail of the outer peripheral portion of said roller member projecting from the longitudinal groove
A guide mechanism in which the roller member rolls when the rollers come into contact with each other. 2. The method of claim 1 Symbol placement mechanism, the guide, characterized in that all or part of the first to third sliding plate, or any of the rollers member formed of an elastic body mechanism.