JP2708934B2 - Grease lubrication device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a grease supply device for supplying lubricating oil such as grease to a sliding portion of a movable platen and a tie bar of a molding machine.

(Prior Art) Conventionally, in an injection molding machine, a molding material heated and fluidized in a heating cylinder is injected into a mold by high pressure, cooled and solidified or hardened therein, and then the mold is opened. We take out molded products.

 FIG. 2 is a front view of a conventional injection molding machine.

In the figure, a mold clamping device 2 and an injection device 3 are installed on a machine base 1. The mold clamping device 2 includes a fixed platen 4 and a movable platen 5, and a mold clamping cylinder 6 is connected to a tie bar 7.
When the movable platen 5 is reciprocated along the
And the movable mold 9 come and go.

The injection device 3 is provided with a nozzle 11 for heating and melting the molding material, that is, the resin, in the hopper 10 so as to reciprocate, and the molten resin is injected from the nozzle 11 into the mold recesses 8a, 9a. Is done. On the other hand, the molded product is
It is discharged below.

However, in the injection molding machine as described above, 1
Since the movable mold 9 reciprocates each time molding is performed and comes into contact with and separates from the fixed mold 8 opposed thereto, it is important to reciprocate the movable mold 9 at high speed in order to improve molding efficiency. is there.

Therefore, the relative friction between the movable platen 5 and the tie bar 7 is reduced. Grease is filled between the two for smooth sliding.

FIG. 3 is a sectional view showing the structure of a sliding portion of a conventional grease lubrication device.

In the drawing, reference numeral 5 denotes a movable platen, which slides along the tie bar 7 to the left and right in the drawing. A hole 20 through which the tie bar 7 penetrates is formed in the movable platen 5, annular tie bushes 21, 22 are disposed at the end of the movable platen on the inner peripheral side of the hole 20, and an annular space 24 is formed. You.

The movable platen 5 is formed with an oil passage 25 extending in the radial direction in communication with the annular space 24, and grease 26 is supplied to the annular space 24 via the oil passage 25.

The tie bar 7 and the tie bushings 21 and 22 form a clearance a so as to be slidable.
Satisfies the clearance a to prevent galling and the like.

(Problems to be Solved by the Invention) However, in the grease lubrication device having the above configuration, the grease 26 is housed in the annular space 24 formed by closing the hole 20 of the movable platen 5 with the tie bushes 21 and 22. Therefore, when the movable platen 5 is moved at a high speed by opening and closing the mold at a high speed, the grease 26 filled in the annular space 24 leaks out, and in severe cases, scatters to the dies 8 and 9.

By reducing the clearance a between the tie bar 7 and the tie bushings 21 and 22, leakage can be reduced by that amount, but on the other hand, the supply amount of the grease 26 decreases and lubrication cannot be performed for a long period of time. Then, it becomes necessary to perform greasing many times.

The present invention solves the above-mentioned problems of the conventional grease lubrication device, and can reduce the friction between the movable platen and the tie bar, without reducing the clearance between the tie bar and the tie bush. Another object of the present invention is to provide a grease lubrication device that can prevent grease from leaking out.

(Means for solving the problem) Therefore, in the grease lubrication device of the present invention,
A tie bar, a movable platen having a hole formed therethrough, an annular tie bushing slidably disposed in the hole so as to face the tie bar, and forming an annular space; The ball bearing is slidably disposed with the tie bar and forms a grease chamber for containing grease between the movable platen and the movable platen, and has an oil passage communicating the grease chamber with the outside of the movable platen.

The ball bearing includes a sleeve-shaped bearing retainer having holes formed at a plurality of locations in the axial direction and the circumferential direction, and a ball disposed in each of the holes and rotatably sliding with the tie bar.

(Function) According to the present invention, in the grease lubricating apparatus as described above, the tie bar, the movable platen having the hole formed therethrough, and the slidably slidably facing the tie bar in the hole. An annular tie bush that is disposed and forms an annular space, and is disposed slidably with the tie bar in the annular space,
It has a ball bearing forming a grease chamber for containing grease between the movable platen and an oil passage communicating the grease chamber with the outside of the movable platen.

The ball bearing includes a sleeve-shaped bearing retainer having holes formed at a plurality of locations in the axial direction and the circumferential direction, and a ball disposed in each of the holes and rotatably sliding with the tie bar.

In this case, when the mold clamping device operates and the movable platen reciprocates, the ball is rotated and slid on the outer peripheral surface of the tie bar. At this time, the grease stored in the grease chamber is
It is supplied to the sliding surface from a gap between the ball and the bearing retainer.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a sliding portion of the grease lubrication device of the present invention.

In the drawing, reference numeral 5 denotes a movable platen, which slides along the tie bar 7 to the left and right in the drawing. A hole 20 through which the tie bar 7 penetrates is formed in the movable platen 5, and annular tie bushes 21, 22 are press-fitted at the end of the movable platen on the inner peripheral side of the hole 20 to form an annular space 24. Is done.

The movable platen 5 is formed with an oil passage 25 extending in the radial direction in communication with the annular space 24, and grease 26 is supplied to the annular space 24 via the oil passage 25.

The tie bar 7 and the tie bushings 21 and 22 form a clearance a so as to be slidable.
Satisfies the clearance a to prevent galling and the like.

A ball bearing 16 is fitted between the tie bushings 21 and 22 so as to slide and face the tie bar 7. Then, a grease chamber 17 is formed outside the ball bearing 16.

The ball bearing 16 is composed of a sleeve-shaped bearing retainer 31, holes 32 formed in various parts of the bearing retainer 31, and balls 33 disposed in the holes 32. 33 are fitted so that they can rotate.

The grease 26 injected from the supply inlet 34 is supplied to the grease chamber 17
And is supplied to the sliding surface with the tie bar 7 through a gap between the ball 33 of the ball bearing 16 and the hole 32 of the bearing retainer 15. Therefore, a large amount of grease does not flow.

When the movable platen 5 reciprocates on the tie bar 7 by the mold opening / closing operation, the ball 33 of the ball bearing 16 rotates, so that an appropriate amount of grease 26 is supplied to the sliding surface via the gap. Since no clearance a is formed between the ball bearing 16 and the tie bar 7, the grease 26 is uniformly supplied to the entire circumference of the tie bar 7. Therefore, even if the clearance a between the tie bushings 21 and 22 and the tie bar 7 is deviated, there is no possibility that a portion with insufficient lubrication or galling will occur.

Even when the grease chamber 17 has a large capacity to accommodate a large amount of grease 26, the supply of the grease 26 to the sliding surface is always performed through the ball 33, so that the grease 26 is constant, and a stable lubricating action is provided over a long period of time. Can be maintained.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible based on the gist of the present invention.
They are not excluded from the scope of the present invention.

For example, in this embodiment, the grease supply device in the lubricating device for the movable platen is described, but any device having a mechanism for sliding a member on a rod can be adopted.

(Effects of the Invention) As described in detail above, according to the present invention, in a grease lubrication device, a tie bar, a movable platen having a hole formed through the tie bar, and a tie bar facing the tie bar in the hole. An annular tie bush that is slidably disposed to form an annular space; and a grease chamber that is disposed slidably with the tie bar in the annular space and accommodates grease between the movable platen. And a fluid passage communicating the grease chamber with the outside of the movable platen.

The ball bearing includes a sleeve-shaped bearing retainer having holes formed at a plurality of locations in the axial direction and the circumferential direction, and a ball disposed in each of the holes and rotatably sliding with the tie bar.

In this case, when the movable platen reciprocates by operating the mold clamping device, the balls are rotated and slid on the outer peripheral surface of the tie bar, and the grease accommodated in the grease chamber is rotated by the rotation of each ball. Is gradually supplied to the sliding surface from the gap between the bearing and the retainer. And the above hole is
Since the grease is formed at a plurality of positions in the axial direction and the circumferential direction, the grease is uniformly supplied to the entire sliding surface.

Therefore, the friction between the movable platen and the tie bar can be sufficiently reduced.

Further, even when the clearance between the tie bush and the tie bar is uneven, there is no occurrence of a location where lubrication is insufficient or galling occurs.

And even if the grease chamber is enlarged to accommodate a large amount of grease, the supply of grease to the sliding surface is
Since the operation is always performed through the gap between each ball and the bearing retainer, the operation is constant, and a stable lubricating action can be maintained for a long period of time. Further, it is possible to prevent the grease from leaking from between the movable platen and the tie bar.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the structure of a sliding portion of a grease greasing device of the present invention, FIG. 2 is a front view of a conventional injection molding machine, and FIG. It is sectional drawing which shows a structure. 5: movable platen, 7: tie bar, 16: ball bearing, 17: grease chamber, 21, 22: tie bush, 26: grease, 31: bearing retainer, 33: ball, 34: supply port.

Claims (1)

(57) [Claims] (A) a tie bar; (b) a movable platen having a hole formed through the tie bar; and (c) an annular space disposed in the hole so as to be slidably opposed to the tie bar. (D) slidably disposed in the annular space with the tie bar;
A ball bearing that forms a grease chamber that accommodates grease between the movable platen and (e) an oil passage that communicates the grease chamber with the outside of the movable platen; and (f) the ball bearing has a shaft. A grease lubrication device comprising: a sleeve-shaped bearing retainer having holes formed at a plurality of positions in a direction and a circumferential direction; and a ball disposed in each of the holes and rotatably sliding with the tie bar.