JPH06648Y2 - Dustproof seal for linear guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to improvement of a dustproof seal in a linear guide device.

[Conventional technology]

Generally, a linear guide device includes a guide rail 1 extending in the axial direction as shown in FIG. 8 and a slider 2 movably supported on the guide rail 1.

Ball rolling grooves 3 are formed on both outer side surfaces of the guide rail 1 in the axial direction, and the slider body 2A of the slider 2 has inner surfaces of both sleeve portions 4 thereof, which face the ball rolling grooves 3. Ball rolling grooves that are not formed are respectively formed. A large number of balls are rotatably loaded between the ball rolling grooves facing each other, and the slider 2 moves axially on the guide rail 1 through the rolling of the balls. Has become. With this movement, the balls interposed between the guide rail 1 and the slider 2 roll to slide on the slider 2
To the end of the slider body 2A. These balls must be circulated in order to continuously move the slider 2 in the axial direction. Therefore, the slider body 2A
A ball return hole (not shown) further penetrating in the axial direction is formed in the sleeve portion 4 of the slider, and end caps 5 are provided at both front and rear ends of the slider body 2A, and a U-shaped connection communicating with the ball return hole is provided therein. A ball circulation path is formed by forming the path. Further, since dust and dirt are accumulated in the ball rolling groove 3 and the groove 6 in the portion of the guide rail 1 on which the slider 2 slides, smooth rolling of the ball is hindered. A dustproof seal 10 is typically attached.

By the way, as the conventional dustproof seal 10, for example,
The applicant has previously proposed what is shown in FIG. 11 to FIG. 11 (Shokaisho 60-103623). This is composed of a metal plate 7 which is attached to the end surface of the end cap 5 with the back surface side and fixed by a machine screw 11, and a rubber body 8 adhered to the entire front surface side of the metal plate 7. An opening 9 through which the guide rail 1 is inserted is provided in the central portion, and the whole is formed in a substantially U shape. The inner edge of the opening of the metal plate 7 is simply linear, while the inner edge of the opening of the rubber body 8 adhered to the metal plate 7 has a semi-corrugated half corresponding to the ball rolling groove 3 and the recess 6 of the guide rail 1. Circular protrusions 8a and 8b and a trapezoidal protrusion 8c are provided in a protruding manner.

An acute-angled clip portion L is formed at the tip of each of the projections 8a, 8b and the projection 8c (see FIG. 11), and the lip portion L forms the ball rolling groove 3 of the guide rail 1.
Also, scraping off dust, dust and the like while slidingly contacting the concave stripes 6.

In addition, reference numeral 12 in FIG. 8 denotes an oil supply nipple screwed to the end cap 5.

[Problems to be solved by the invention]

In the dustproof seal of such a linear guide device,
Even if the back side of the metal plate 7 is applied to the end surface of the end cap 5 and the machine screw 11 is tightened, the end surfaces are completely incomplete due to geometrical errors such as surface roughness and flatness of both contact surfaces. It is difficult to bring them into close contact with each other, and a minute gap is generated between the joint surfaces.

Therefore, depending on the environmental conditions in which the linear guide device is installed, fine foreign particles such as dust particles and cutting oil and grinding oil may enter from the gaps between the joint surfaces, or these foreign substances may enter the linear guide device. There is a risk of poor lubrication by changing the quality of the lubricant enclosed inside. Further, when grease is used as the lubricant, there is no problem, but when liquid lubricant is used, there is a problem in that the linear guide device is impaired in smooth operation because it is lost to the outside through the gap between the joint surfaces. .

Then, this invention aims at solving the conventional problem by providing the dustproof seal which does not produce a gap between the joint surfaces with an end cap.

[Means for solving problems]

The present invention that achieves the above-mentioned object is to provide a guide rail which has ball rolling grooves in the axial direction on both side surfaces and extends long, and a ball rolling groove of the guide rail which is movably supported on the guide rail. A slider body having a ball rolling groove facing the inner surface of the inner surface and a through hole as a ball passage parallel to the inner surface of the slider body, and a ball circulation path for communicating the ball passage with the ball rolling groove. A dust-proof seal for use in a linear guide device comprising an end cap joined to the end of the slider body and a large number of balls rollably inserted in the ball rolling groove. A metal plate having an outer shape substantially similar to the outer shape of the end surface and one surface side of which is joined to the end surface of the end cap, and a lip portion protruding from the inner edge of the opening of the metal plate and slidably contacting the guide rail. of A rubber ridge consisting of a rubber body integrally joined to the surface side, and a rubber ridge rimging the outer periphery excluding the inner edge of the opening can be closely attached to the end surface of the end cap on the side of the joining surface of the metal plate with the end cap. It is the one protruding from.

[Action]

When the back surface of the metal plate of the dustproof seal is brought into contact with the end surface of the end cap and the small screw is tightened, the tightening pressure elastically deforms the rubber ridges that line the outer circumference of the back surface of the metal plate of the dustproof seal, and the end surface of the end cap. Stick to. This allows
The minute gap between the contact surface of the end cap and the dustproof seal is closed, which prevents foreign matter from entering from outside, deteriorates the lubricant, or drains the liquid lubricant, resulting in poor lubrication of the linear guide device. Is effectively prevented.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of the present invention. The end cap is the same as the conventional one shown in FIG.

The dustproof seal 20 is composed of a thin metal plate 21 such as a steel plate as a mandrel and a rubber body 22 integrally vulcanized and adhered to the surface of the dustproof seal 20. Has a U-shaped outer shape formed by cutting out.

As shown in FIG. 3, the U-shaped inner edge of the opening 21A of the metal plate 21 is a straight line on all three sides. Then, on the back surface side (bonding surface side with the end cap) of the metal plate 21, a rubber ridge 30 is provided so as to outline the outer periphery except for the U-shaped inner edge of the opening 21A. The cross-sectional shape of the rubber ridge 30 is, for example, trapezoidal or rectangular, and the height H is 0.3 m.
Very small protrusions with m and width W = 0.5 mm are enough.

A round hole 25 having a small diameter is formed in each of the sleeve portions 23 of the U-shaped metal plate 21 to connect the sleeve portions 23.
A large-diameter round hole 27 is provided in the central portion of 4.

The rubber body 22 has a thickness that is 3 to 4 times the thickness of the metal plate 21 and corresponds to the round holes 25 and 27 of the metal plate 21, and round holes 31 and 33 having a radius slightly larger than these are formed. It is formed and is vulcanized and joined over the entire surface of the metal plate 21.

The outer periphery of the rubber body 22 is U-shaped, but on the inner peripheral side, a protrusion 34 that protrudes from the inner edge of the opening 21A of the metal plate 21.
In addition, semi-circular projections 35 and 36 that match the ball rolling groove 3 of the guide rail 1 and a trapezoidal projection 37 that also matches the recess 6 of the guide rail 1 are provided in a protruding manner. The shapes of the projections 35 and 36 are not necessarily limited to the semicircular shape, and may be triangular or the like in accordance with the shape of the ball rolling groove 3 of the guide rail 1, for example.

As shown in FIG. 5 to FIG. 6, the tip of the protrusion 34, the semicircular protrusions 35 and 36, and the trapezoidal protrusion 37 are formed with a lip portion L with the surface side thereof as an acute angle. The lip portion L comes into contact with the surface of the guide rail 1 with an appropriate tightening allowance to wipe dust and the like attached to the surface of the guide rail 1. A concave groove 38 is provided on the outer periphery of the lip portion L along the inner edge shape of the opening 21A of the metal plate 21 so that the lip portion L is appropriately elastically deformed.

When manufacturing the dustproof seal 20, for example, a rubber molding material is put into the cavity of the lower die of the molding die to preform the rubber body 22. Then, the surface side of the metal plate 21 whose outer periphery is slightly smaller than the outer shape of the cavity of the lower mold is overlaid on the preformed product, and main molding is performed. A recess for forming the rubber ridge 30 is provided in advance on the outer periphery of the mold surface of the upper mold, and the rubber material passes through the slight gap between the outer periphery of the metal plate 21 and the lower mold cavity to the back surface side of the metal plate 21. The rubber ridges 30 are integrally molded by wrapping around and filling the recesses for forming the rubber ridges of the upper mold. Further, if the height of the round hole 31, 33 molding convex portion provided in the lower mold for molding the round hole 31, 33 of the rubber body 22 is formed to be slightly lower than the predetermined depth of the round holes 31, 33, Round holes 25 and 2 on the front surface side of the metal plate 21.
7 outer peripheral surfaces 25a, 27a (that is, the mounting machine screw 1
1, a thin rubber film 40 on the tightening surface of the nimple 12, etc.)
Is molded. With this rubber film 40, the tightening surface 25 for the machine screw 11, the nipple 12, etc. (hereinafter referred to as machine screw etc.)
It is possible to prevent leakage from a and 27a and enhance the sealing effect.

Next, the operation of the dustproof seal 20 having the above configuration will be described.

The dustproof seal 20 is used by being attached to the end face of the end cap 5 attached to the end face of the slider body 2A as in the conventional case. The end cap 5 has a U-shape similar to that of the dustproof seal 20, and the end face thereof is provided with insertion holes (not shown) corresponding to the round holes 31 and 33 on the surface of the dustproof seal 20, and the semicircular protrusions 35 and 36. A protrusion corresponding to the trapezoidal protrusion 37 is provided. Further, screw holes (not shown) are provided on the end surface of the slider body 2A so as to correspond to the round holes 31 and 33 on the surface of the dustproof seal 20.

A small screw or the like inserted through the round holes 31 and 33 of the dustproof seal 20 is further inserted through the corresponding insertion hole of the end cap, and then screwed into the corresponding screw hole of the end surface of the slider body 2A to tighten the dustproof seal. The seal 20 is attached to the slider body 2A together with the end cap 5.

At that time, the protrusions 30 projectingly provided on the outer periphery of the metal plate 21 of the dustproof seal 20 are elastically deformed by the screw tightening force and are brought into close contact with the joint end faces of the end caps, so that the surface roughness or the flat surface between the joint faces is flat. Closes a minute gap based on degree error. As a result, it was possible to prevent the phenomenon that fine dust particles or foreign matter such as cutting oil and grinding oil from the outside enter through the gap between the joint surfaces as in the conventional case. Further, the deterioration of the lubricant enclosed in the linear guide device was also prevented. Further, even if a liquid lubricating oil was used as the lubricant, the flow-out to the outside did not occur from the gap between the joint surfaces.

According to this embodiment, the end cap and the dustproof seal 20
Since the outer peripheral edge portion of the joint surface with and is sealed so as to be surrounded by the rubber ridges 30, regardless of whether the mounting position of the linear guide device is horizontal or vertical, dust from outside is completely removed. It is possible to prevent intrusion and oil leakage from the inside.

[Effect of device]

As described above, according to the present invention, since the rubber ridge that is in close contact with the abutting surface of the end cap is formed on the outer peripheral edge of the metal plate as the mandrel lined with the rubber body of the dustproof seal, the contact is made. It is possible to fill the minute gaps between the contact surfaces, which effectively prevents the intrusion of foreign matter from the outside, prevents the deterioration of the lubricant, and enhances the internal retention of the lubricating oil to ensure good lubrication. Will be realized. As a result, it is possible to ensure the smooth operation of the linear guide device and significantly extend the life of the linear guide device.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a bottom view thereof, FIG. 3 is a rear view of a metal plate which is a constituent member of the above embodiment, and FIG. Part enlarged view, Fig. 5 is No. 4
6 is a sectional view taken along the line VI-VI of FIG. 1 and FIG.
6 is an enlarged view of the VII portion of FIG. 6, FIG. 8 is a perspective view showing an example of a linear guide device to which a conventional dustproof seal is attached, FIG. 9 is a perspective view of a conventional dustproof seal, and FIG. The partial front view which expanded the X section of FIG. 9, and FIG.
It is the XI-XI sectional view taken on the line of FIG. In the figure, 1 is a guide rail, 2 is a slider, 2A is a slider body, 3 is a ball rolling groove, 5 is an end cap, and 7 and 2.
1 is a metal plate, 8 and 22 are rubber bodies, 10 and 20 are dustproof seals, 21A is an opening of a metal plate, 22 is a rubber body, 30 is a rubber ridge, and L is a lip portion.

Claims (1)

[Scope of utility model registration request] 1. A guide rail that has a ball rolling groove extending in the axial direction on both sides and extends long, and a ball rolling member that is movably supported on the guide rail and that opposes the ball rolling groove of the guide rail. The slider main body has a moving groove on the inner side surface and a through hole as a ball passage parallel to the inside of the slider main body, and a ball circulation path for communicating the ball passage with the ball rolling groove. A dustproof seal for use in a linear guide device comprising an end cap joined to an end portion and a large number of balls rollably inserted in the ball rolling groove, the end cap having substantially the same outer shape as that of the end cap. A metal plate having a similar outer shape and one surface side of which is joined to the end surface of the end cap, and a lip portion protruding from the inner edge of the opening of the metal plate and slidably contacting the guide rail are provided on the other surface side of the metal plate. Joined together A rubber ridge that is formed of a rubber body that is formed on the joint surface side of the metal plate with the end cap, and that surrounds the outer periphery of the metal plate except the inner edge of the opening so as to be in close contact with the end surface of the end cap. Dustproof seal of the characteristic linear guide device.