JP3681695B2 - Lubricating device for linear motion mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to oil supply to a linear motion mechanism portion, and more particularly to an oil supply device for a linear motion mechanism portion that is a combination of a linear drive guide shaft and a linear motion bearing that is opposed to the linear drive guide shaft.
[0002]
[Prior art]
In a machine tool such as a milling machine or a labor-saving machine, as shown in FIGS. 1 and 2, the bed (B) that supports or holds the workpiece (W) is inserted into a plurality of guide shafts (G) (G), A linear motion reciprocating mechanism (M) such as a feed screw device is interposed between the frame supporting the guide shafts (G) and (G) and the bed (B). The bed (B) is reciprocated by the operation of the linear motion reciprocating mechanism (M).
[0003]
Recently, in order to make this reciprocating motion smooth, linear motion rolling bearings (1) and (1) are employed in the support portion of the bed (B) by the guide shafts (G) and (G). This linear motion rolling bearing (1) is mounted in such a manner as to be slidably fitted to the guide shaft (G), and a large number of balls incorporated therein roll between the guide shaft (G) and move. Circulates through the ball passage in the bearing body. Therefore, the movement resistance of the linear motion rolling bearing (1) is greatly reduced, and the movement resistance of the bed (B) supported by the plurality of linear motion rolling bearings (1) (1) is greatly reduced.
[0004]
[Problems to be solved by the invention]
However, in this linear motion mechanism using linear motion rolling bearings (1) and (1), the oil film on the surface of the guide shaft (G) disappears and the guide shaft (G) becomes rusted when used for a long time. Further, there is a problem that the smooth movement of the ball in the linear motion rolling bearing (1) is impaired. Since the linear motion rolling bearing (1) is filled with a lubricant such as grease, the lubricant is applied to the surface of the guide shaft (G) from the linear motion rolling bearing (1). Since the capacity is small, the linear motion rolling bearing (1) is in a grease-cut state in a relatively short period of time. In addition, since the lubricant is mainly used for lubrication in the linear motion rolling bearing (1), the lubricant is not supplied to the guide shaft (G). Therefore, in order to maintain an oil film constantly formed on the surface of the guide shaft (G), it is necessary to replenish grease or the like frequently from the grease nipple or the like provided in the linear motion rolling bearing (1). .
[0005]
However, in many cases, the arrangement portion of the linear motion rolling bearing (1) is set in a narrow place or a place where it is difficult to replenish grease, and the lubricating component on the surface of the guide shaft (G) disappears and is cheap. As a result, the surface of the guide shaft (G) rusts and the smooth operation of the balls in the linear motion rolling bearing (1) is impaired.
The present invention has been made in view of such points,
`` Lubricating the linear motion rolling bearing (1) on the guide rail (R) as the guide shaft (G) so that the linear motion rolling bearing (1) is slidably fitted, and separate from the linear motion mechanism. In the `` configured oiling device '', in order for the oil film on the surface of the guide rail (R) to be formed over a long period of time, the member that moves together with the linear motion rolling bearing (1) is used to The challenge is to be able to refuel.
[0006]
[Means for Solving the Problems]
The technical means of the present invention for solving the above problems are as follows:
“The guide rail (R) is composed of a guide rail portion (R1) on which the linear motion rolling bearing (1) is slidably fitted, and a base function portion (R2) provided below the guide rail portion (R2). In the guide rail portion (R1), a rolling element groove in which the rolling element accommodated in the linear motion rolling bearing (1) travels is formed in the axial direction,
A space (21) that opens to the inner peripheral side is formed in the cover frame (2) that is slidably and detachably fitted to the guide rail portion (R1), and a lubricating component is formed in the space (21). Alternatively, the pad (3) containing a chemical component such as a rust preventive component is accommodated, and the pad (3) is shaped to be in close contact with the rolling element groove of the guide rail portion (R1), and the guide rail ( R ”is provided with attachment means for detachably attaching the cover frame (2) to the axial end surface portion of the linear motion rolling bearing (1).
[0007]
The technical means operates as follows.
The oil supply device having the above-described configuration is attached to the axial end surface portion of the linear motion rolling bearing (1) by the attachment means, and the pad (3) accommodated in the space (21) of the cover frame (2) is attached to the guide rail ( It is fitted on the guide rail part (R1) of R). Then, the pad (3) comes into close contact with the rolling element groove (groove in which the rolling element accommodated in the linear motion rolling bearing (1) travels) formed in the guide rail portion (R1). In this state, the cover frame (2) is moved with the movement of the bed (B), that is, with the movement of the linear motion rolling bearing (1). Accordingly, the chemical component in the pad (3) accommodated in the cover frame (2) is applied to the rolling element groove or the like of the guide rail portion (R1).
[0008]
The cover frame (2) is detachably attached to the linear motion rolling bearing (1) and is detachably fitted to the guide rail portion (R1). Therefore, when the oily component in the pad (3) is exhausted, remove it from the linear motion rolling bearing (1) and the guide rail (R1) and replace the whole, or the drug component in the pad (3) Replenish.
[0009]
【The invention's effect】
Since the configuration is such that the pad (3) impregnated with the oil component is accommodated in the cover frame (2), the whole can be constructed at low cost by injection molding of synthetic resin or the like.
In addition, since the chemical component impregnated in the pad (3) is constantly supplied to the surface of the guide rail portion (R1), the oil film on the surface of the guide rail portion (R1) such as the rolling element groove is not easily lost. Furthermore, when the impregnated drug component in the pad (3) disappears, it is simply removed and replenished with the drug component or replaced with a new oiling device. Easy to do.
[0010]
Therefore, in maintenance such as a labor-saving machine, a measure for maintaining the surface of the guide rail portion (R1) in an oil film formation state at all times is simple.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, the above-described embodiment of the present invention will be described in detail with reference to the drawings.
[Prerequisite technology]
First, prerequisite technologies necessary for explaining the embodiment of the present invention will be described.
The base technology shown in FIGS. 3 to 5 is such that an oil supply device (P) comprising a cover frame (2) and a pad (3) can be mounted on a guide shaft (G) having a circular cross section. (2) is composed of a pair of frame halves (2a) (2a) and the pad (3) is composed of a pair of pad halves (3a) (3a). (P1) (P1).
[0012]
For this reason, the frame half (2a) constituting each oil supply device half (P1) is generally semicircular, and its inner radius is set slightly larger than the radius of the guide shaft (G). Both halves have the same configuration. The cross-sectional shape of the frame half body (2a) is a U-shaped cross section that opens to the inner peripheral side, and a pad half body (3a) that is a rectangular cross section that is just accommodated in this cross section and is semicircular as a whole. The frame halves (2a) are accommodated.
[0013]
The pad half (3a) is a pad (3) whose rectangular cross section is continuous in a donut shape, divided into two by a diameter line, and its inner radius is slightly smaller than the diameter of the guide shaft (G). It is made of a material rich in the impregnation characteristics of drug components such as sponge, nonwoven fabric, felt, etc., and is impregnated with a predetermined amount of lubricating oil.
In addition, a pair of protrusions (22) and (22) protrude from one end of the frame half (2a) in the circumferential direction, and an engagement hole (23 at a position symmetrical to the protrusion at the other end. ) (23) is formed. And the formation direction of this engagement hole (23) is set in parallel with the said protrusion (22).
[0014]
As shown in FIGS. 4 and 5, the oil supply device (P) has a pair of oil supply device halves (P1) (P1) facing each other and a linear motion rolling bearing (1) (1) (1) (1 ) Is used by being externally fitted to the guide shaft (G). At the time of this external fitting, the oil supply device halves (P1) and (P1) are opposed to the guide shaft (G), and the projection (22) of the frame half (2a) is opposed to the opposed frame half (2a ) Are respectively fitted into the engagement holes (23). Note that the fitting relationship between the protrusion (22) and the engagement hole (23) is maintained in the coupling relationship by forced press-fitting, and the protrusion (22) is pulled out from the engagement hole (23) by forcibly separating. When the projections (22) and (22) are inserted into the engagement holes (23) and (23) and connected, the frame halves (2a) and (2a) are connected in an annular shape to form the cover frame (2). The oil supply device (P) is externally attached to the guide shaft (G). In this state, the pad halves (3a) (3a) accommodated in each frame half (2a) are also connected in an annular shape to form the pads (3), which are in close contact with the surface of the guide shaft (G). .
[0015]
Accordingly, when the bed (B) is moved, the linear motion rolling bearings (1) (1) are moved, and as a result of reciprocal movement of the linear rolling bearings (1) (1), an oil supply device comprising a cover frame (2) and a pad (3) ( P) is reciprocated, and oil is supplied from the pad (3) to the surface of the guide shaft (G).
Then, after a predetermined period of use has elapsed, when the medicine component in the pad (3) has disappeared, the fitting engagement between the protrusion (22) and the engagement hole (23) is released, and the oil supply device half By separating (P1) and (P1), the fueling device (P) can be removed from the guide shaft (G). When replacing the oil supply device (P) with a new one, reinstall the oil supply device (P) between the linear motion rolling bearings (1) and (1) in the same procedure as described above. In some cases, the pad (3) is replenished with a chemical component such as lubricating oil.
[0016]
FIG. 4 shows a mode in which the fueling device halves (P1) and (P1) are combined vertically, but actually they are combined left and right as shown in FIG. This facilitates the assembly and disassembly of the oil supply device halves (P1) (P1) even below the bed (B).
[Embodiment 1]
Next, Embodiment 1 of the present invention will be described.
The first embodiment can be used for a rail (R) having a substantially rectangular cross section as shown in FIGS. Usually, the rail (R) is composed of a guide rail portion (R1) that functions as a guide shaft having an inverted trapezoidal cross section, and a base function portion (R2) that is continuously provided below the guide rail portion (R2). ) Is placed on the base of the device or the like, and the entire rail (R) is fixed. The linear motion rolling bearings (1) and (1) are mounted so as to be externally fitted to the guide rail portion (R1), and the bed (B) is attached to the upper surface of the linear motion rolling bearings (1) and (1). .
[0017]
Ball grooves (L) and (L) are formed in the axial direction on both ends of the upper portion of the cross section of the guide rail portion (R1) so that the balls (11) and (11) accommodated in the linear motion rolling bearing (1) are in contact with each other. Has been. In order to apply to this rail (R), in this embodiment, as shown in FIG. 8, the cover frame (2) consisting of the frame halves (2a) (2a) of the fueling device (P) is partially opened. The cover frame (2) has a shape that is externally fitted to the guide rail portion (R1).
[0018]
The frame half (2a) is generally bent into an L-shape as a whole, and the outer peripheral wall has a horizontal plate portion (24) in which protrusions (22) and engagement holes (23) are formed on both sides of one end. And a pair of mutually symmetrical vertical walls (25) hanging from the other end thereof, an inclined wall portion (26) inclined obliquely inward from the lower end thereof, and connected to both front and rear sides thereof The side plate portions (27) and (27) are configured so that the inner peripheral side of the side plate portion (27) is set to be slightly larger than the shape obtained by vertically dividing the cross-sectional profile of the guide rail portion (R1).
[0019]
The space constituted by these parts becomes a space (21) that is open to the inner peripheral side, and a generally half L-shaped pad half (3a) is accommodated therein to constitute a fueling device half (P1). The
The inner circumferential shape of the cross-section of the pad half (3a) matches the vertical half of the cross-sectional profile of the guide rail portion (R1), and includes the ball groove (L) (L). ) Is in close contact with the upper surface of the guide rail portion (R1) and the side portion in the vicinity thereof.
[0020]
The pair of oil supply device halves (P1) and (P1) configured as described above are opposed to each other and externally fitted to the guide rail portion (R1), and the protrusions (22) and (22) are engaged with the engagement holes (23). When press-fitting into (23), as shown in FIG. 9, the oil supply device (P) is externally fitted to the guide rail portion (R1).
When the mounting position of the oil supply device (P) is set in the same manner as in the first embodiment, the chemical component impregnated in the pad (3) incorporated in the oil supply device (P) is transferred to the linear motion rolling bearing (1). Along with the movement, it is applied to the surface of the guide rail portion (R1).
[0021]
Further, in the first embodiment, the oil supply device (P) is mounted so as to be attached and fixed to the linear motion rolling bearing (1). For example, as shown by an imaginary line in FIG. 8, a structure in which a fixing means such as a double-sided tape (T) is provided on one side surface of the oil supply device (P), or an oil supply device (P) is used. Further, it is possible to adopt a method in which an engaging means for engaging with the linear motion rolling bearing (1) is provided.
[0022]
[Embodiment 2]
In Embodiment 2 shown in FIG. 10, the oil supply device (P) can be integrally mounted with the linear motion rolling bearing (1) interposed therebetween, and each of the oil supply device halves (P1) A pair of frame halves (2a) and (2a) having the same configuration as in the first embodiment are integrally connected by a connecting bar (28) at a predetermined interval, and are connected to each frame half (2a). The same half pad (3a) as in the first embodiment is accommodated.
[0023]
When the pair of oil supply device halves (P1) and (P1) configured as described above are fitted to the guide rail portion (R1) with the linear motion rolling bearing (1) facing each other, the oil supply is performed as shown in FIG. The device (P) is mounted with the linear motion rolling bearing (1) in between, and the oil supply device (P) is surely moved integrally with the linear motion rolling bearing (1).
As a modification of the second embodiment, as shown in FIG. 12, each half of the fuel supply device (P1) may have an engaging hook (28a) and an engaged hook (28b). good. In this case, when the engaging hook (28a) and the engaged hook (28b) are engaged with each other, as shown in the figure, the oil supply device (P) is attached to the guide rail portion (R1). The In this case, the protrusions (22) and (22) and the engagement holes (23) and (23) are unnecessary, but the protrusions (22) and (22) and the engagement holes (23) and (23) are used together. Also good.
[0024]
In any of the above embodiments, in order to detachably attach the fuel supply device halves (P1) (P1) to the rail (R) from the left and right without removing the bed (B) from the equipment. Needless to say, the thickness of the upper part of the oil supply device halves (P1) and (P1) is set smaller than the gap between the rail (R) and the bed (B).
[Brief description of the drawings]
FIG. 1 is an explanatory view of a linear motion bearing mechanism. FIG. 2 is a sectional view taken along line XX. FIG. 3 is an exploded view of a mounting portion of a fueling device for explaining a prerequisite technology of an embodiment of the invention. FIG. 5 is a cross-sectional view of a principal part of a mounting portion of an oil supply device, illustrating a prerequisite technology of an embodiment of the present invention. FIG. 6 is an explanatory diagram of a linear motion bearing mechanism to which the first embodiment is applied. FIG. 7 is a cross-sectional view of the main part of the linear motion bearing mechanism. FIG. 8 is an exploded view of the first embodiment. FIG. 9 is a cross-sectional view of the main part in a used state. FIG. 11 is a plan view of the usage state of this embodiment. FIG. 12 is a plan view of the usage state of another embodiment.
(G) ... Guide shaft
(R) ・ ・ ・ Guide rail
(R1) ・ ・ ・ Guide rail
(1) ・ ・ ・ Linear rolling bearing
(2) ... Cover frame
(21) ・ ・ ・ Space
(3) ・ ・ ・ Pad
(2a) ・ ・ ・ Half frame
(3a) ・ ・ ・ Pad half

Claims (2)

In a lubrication device configured to supply oil to a linear motion mechanism portion of a type in which a linear motion rolling bearing (1) is slidably fitted to a guide rail (R) and is configured separately from the linear motion mechanism portion,
The guide rail (R) is composed of a guide rail portion (R1) on which the linear motion rolling bearing (1) is slidably fitted, and a base function portion (R2) provided below the guide rail portion (R2). In the guide rail portion (R1), a rolling element groove in which a rolling element accommodated in the linear motion rolling bearing (1) travels is formed in an axial direction,
A space (21) that opens to the inner peripheral side is formed in the cover frame (2) that is slidably and detachably fitted to the guide rail portion (R1), and a lubricating component is formed in the space (21). Alternatively, the pad (3) containing a chemical component such as a rust preventive component is accommodated, and the pad (3) is shaped to be in close contact with the rolling element groove of the guide rail portion (R1), and the guide rail ( An oil supply device for a linear motion mechanism portion, provided with attachment means for detachably attaching the cover frame (2) to an axial end surface portion of the linear motion rolling bearing (1) in a state of being mounted on R).   The cover frame (2) is composed of a pair of frame halves (2a) (2a) that can be contacted and separated in a direction perpendicular to the axis, and the pad (3) is similar to the cover frame (2). 2. The oil supply to the linear motion mechanism unit according to claim 1, comprising a pair of divided pad halves (3a) (3a), wherein the frame halves (2a) (2a) are detachably engaged with each other. apparatus.

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