JP2019038081A - Lubrication oil recovery device - Google Patents

Abstract

Provided is a lubricating oil recovery device capable of avoiding problems such as leakage of lubricating oil from a gear case at the time of an emergency stop of a gear drive main shaft device without increasing the volume of the gear case. A lubricating oil recovery device 2 includes a lubricating oil suction passage 3 having one end connected to a lubricating oil discharge port 171 at a lower portion of the gear case 17, and a second end connected to the other end of the lubricating oil suction passage 3 and in the gear case 17. A suction device 4 that sucks the lubricating oil L, an auxiliary tank 5 that constitutes a part of the lubricating oil suction passage 3 and has a vent 51 in the upper part, and the auxiliary tank 5 when the suction device 4 is operated An atmospheric release valve 6 that allows at least a part of the lubricating oil L in the gear case 17 to flow into the auxiliary tank 5 by opening the auxiliary tank 5 to the atmosphere through the vent 51 when the suction device 4 is stopped. It has. [Selection] Figure 1

Description

  The present invention relates to a lubricating oil recovery device used for taking out and recovering lubricating oil supplied into a gear case, for example, in a gear-driven spindle device of a machine tool.

  For example, there is a gear drive type as a spindle device of a machine tool. In the spindle device, lubricating oil is supplied into the gear case by a supply pump or the like in order to lubricate and cool the gears and bearings arranged in the gear case of the spindle head. The supplied lubricating oil is discharged through a lubricating oil discharge port formed in the lower part of the gear case, and is recovered in a recovery tank or the like (for example, see Patent Document 1 below).

Here, as a device for collecting the lubricating oil in the gear case, one end of the lubricating oil suction path connected to the lubricating oil discharge port of the gear case and the other end of the lubricating oil suction path connected to suck the lubricating oil in the gear case There is known a lubricating oil recovery device including a suction device such as a suction pump.
In addition to the above-described lubricating oil recovery device, in order to protect the drive motor so that the oil level of the lubricating oil collected in the gear case does not exceed the specified height, the gear case is separated from the lubricating oil discharge port. In some cases, an overflow lubricating oil discharge portion is provided.

Japanese Utility Model Publication No. 4-73444

In the above-described lubricating oil recovery device, a suction pump or the like having a sufficient suction capacity compared to the amount of lubricating oil supplied by a supply pump or the like is used as the suction device.
However, for example, when the main shaft device stops in an emergency, both the supply pump and the suction pump are stopped at the same time, whereby the lubricating oil in the supply pipe flows into the gear case, and a large amount of lubricating oil accumulates in the gear case. Therefore, when the overflow lubricating oil discharging part as described above is provided in the gear case, the lubricating oil may leak from the overflow lubricating oil discharging part at the time of emergency stop of the spindle device.
Thus, it is conceivable to set the gear case volume in advance in anticipation of such a situation. However, in this case, there is a problem that the entire spindle device is enlarged.

  The present invention has been made in view of the above problems, and avoids problems such as leakage of lubricating oil from the gear case at the time of an emergency stop of the gear drive type spindle device without increasing the volume of the gear case. It is an object of the present invention to provide a lubricating oil recovery device that can perform the above-described operation.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A lubricating oil recovery device for taking out and recovering lubricating oil supplied into a gear case from a lubricating oil discharge port formed in a lower part of the gear case,
A lubricating oil suction path with one end connected to the lubricating oil outlet;
A suction device connected to the other end of the lubricating oil suction path and sucking the lubricating oil in the gear case;
An auxiliary tank that constitutes a part of the lubricating oil suction passage and has an air vent at the top;
An air release valve that shuts off the inside of the auxiliary tank from the atmosphere when the suction device is operated, and allows at least a part of the lubricating oil in the gear case to flow into the auxiliary tank by opening the inside of the auxiliary tank through the vent when the suction device is stopped. And a lubricating oil recovery device.

2) A cylinder provided in the lubricating oil suction path between the auxiliary tank and the suction device, a piston movable in the cylinder in the axial direction, and a piston disposed at one end of the cylinder. And a biasing member that biases toward the
The cylinder has a lubricating oil inlet to which one end of the lubricating oil suction path on the auxiliary tank side is connected, a lubricating oil outlet to which one end of the lubricating oil suction path on the suction device side is connected, and one end of which is the vent of the auxiliary tank A venting communication port connected to the other end of the venting communication passage connected to, and an air release port,
The piston includes a lubricating oil suction communication path that allows the lubricating oil inlet and the lubricating oil outlet to communicate with each other when the suction device is moved to the other end side of the cylinder by the suction pressure when the suction device is operated, and a biasing member when the suction device is stopped 1. The lubricating oil recovery apparatus according to 1), further including an air opening communication passage that allows the air communication port and the air opening port to communicate with each other when moved to one end side of the cylinder by the urging force.

  According to the lubricating oil recovery device of 1) above, the lubricating oil supplied into the gear case is normally sucked and taken out from the lubricating oil discharge port of the gear case by the suction device through the lubricating oil suction passage. On the other hand, for example, when the suction device stops due to an emergency stop of the gear driven spindle device, the atmosphere release valve is opened and the auxiliary tank is opened to the atmosphere, so that at least one of the lubricating oil in the gear case is released. Since the portion can be allowed to flow into the auxiliary tank, it is possible to reliably avoid the problem that the lubricating oil leaks from the overflow lubricating oil discharge portion without increasing the volume of the gear case.

  According to the lubricating oil recovery apparatus of 2) above, the air release valve has a cylinder, a piston, and an urging member, the closed state in which the inside of the auxiliary tank is shut off from the atmosphere and the lubricating oil is sucked, and the auxiliary tank Since the switching between the open state in which the inside is opened to the atmosphere and the lubricating oil flows into the auxiliary tank from the gear case is automatically performed by the movement of the piston by the suction pressure by the suction device and the biasing force of the biasing member, It is easy to use and the device configuration is simple and the cost can be reduced.

1 is a vertical sectional view showing an overall configuration of a lubricating oil recovery apparatus according to an embodiment of the present invention. FIG. 2 shows a state of the lubricating oil recovery apparatus during suction of lubricating oil, wherein (a) is a partially enlarged vertical sectional view, (b) is a sectional view taken along line BB in (a), and (c) is shown in FIG. It is sectional drawing which follows the CC line of (a). FIG. 2 shows a state of the lubricating oil recovery device when the lubricating oil suction is stopped, where (a) is a partially enlarged vertical sectional view, (b) is a sectional view taken along line BB in (a), (c). These are sectional drawings which follow the CC line of (a).

An embodiment of the present invention will be described below with reference to FIGS.
In the following description, “left and right” refer to the left and right in FIG. 1, FIG. 2 (a), and FIG. 3 (a).

In the embodiment shown in FIGS. 1 to 3, the present invention is applied to a lubricating oil recovery device in a gear drive main spindle device of a machine tool. As shown in FIG. 1, the gear-driven spindle device (1) includes a spindle head (11), and a spindle (inside the spindle head (11), rotatably provided around a horizontal axis line via a bearing (12)). 13) and a driven gear (14) connected to a horizontal drive shaft (not shown) of a motor (15) and a driven gear (14) provided continuously to the spindle head (11) and attached to the main shaft (13). And a gear case (17) in which a drive gear (16) that can be meshed with each other is housed. The drive gear (16) is attached to the left and right side walls of the gear case (17) via bearings (18) so as to be rotatable around a horizontal axis.
Although not shown in detail, in the gear case (17), the lubricating oil supplied from the lubricating oil supply source (collection tank) by the supply pump is formed in the lubricating oil supply port formed at the required location of the gear case (17). The driven gear (14), the drive gear (16), and the bearing (18) are lubricated and cooled by this lubricating oil.
A lubricating oil discharge port (171) is formed in the lower part of the gear case (17) so as to penetrate the lower end of the right side wall.
The lower part of the gear case (17) has an overflow lubricating oil comprising a lubricating oil discharge port (172a) penetrating the lower end of the left side wall and an overflow pipe (172b) connected to the lower end of the discharge port (172a). A discharge part (172) is formed. To prevent the motor (15) from being damaged or damaged due to the ingress of lubricant, the overflow lubricant drain (172) prevents the oil level of the lubricant accumulated in the gear case (17) from exceeding the specified height. ing.

Further, as shown in FIG. 1, the gear drive main shaft device (1) is provided with a lubricating oil recovery device (2) according to the present invention.
The lubricating oil recovery device (2) includes a lubricating oil suction path (3) having one end connected to the lubricating oil discharge port (171), and a gear case (17) connected to the other end of the lubricating oil suction path (3). A suction device (4) for sucking the lubricating oil inside, an auxiliary tank (5) that forms part of the lubricating oil suction passage (3) and has a vent (51) at the top, and a suction While the device (4) is activated, the auxiliary tank (5) is shut off from the atmosphere, and when the suction device (4) is stopped, the auxiliary tank (5) is opened to the atmosphere through the vent (51) to thereby open the gear case (17). And an air release valve (6) for allowing at least part of the lubricating oil therein to flow into the auxiliary tank (5).

  In the lubricating oil suction path (3), portions other than the auxiliary tank (5) and the air release valve (6) are constituted by, for example, a pipe material (31) such as a soft or hard resin pipe material or a metal pipe material.

As the suction device (4), a suction pump is usually used.
The lubricating oil sucked by the suction device (4) is sent to a recovery tank (not shown) through the lubricating oil suction path (3) and the lubricating oil recovery path (8), and from here, by a supply pump (not shown) It is supplied again into the gear case (17).

In this embodiment, the auxiliary tank (5) has a horizontally long shape, and its left end opening (lubricating oil inlet) is located on the outer surface of the lower end of the right side wall of the gear case (17). It is connected and fixed so as to communicate with the lubricant discharge port (171). A lubricating oil outlet (52) is formed at the lower end of the right end wall of the auxiliary tank (5). The vent hole (51) is formed in a portion near the right end of the top wall portion of the auxiliary tank (5).
The arrangement of the auxiliary tank is not limited to the above, and may be provided in the middle of the length of the lubricating oil suction passage (3), for example.

  The air release valve (6) includes a cylinder (61) that is long on the left and right provided in the lubricating oil suction path (3) between the auxiliary tank (5) and the suction device (4), and a shaft that extends in the cylinder (61). A piston (62) movable in the direction (left-right direction), and a biasing member (63) arranged in the cylinder (61) and biasing the piston (62) toward the left end of the cylinder (61) ing.

The cylinder (61) has a horizontal cylindrical shape with both left and right ends closed.
A lubricating oil inlet (61a) is formed on the right side of the peripheral wall of the cylinder (61), and one end (right end) of the lubricating oil suction passage (31) on the auxiliary tank (5) side is connected to the lubricating oil inlet (61a). ing.
A lubricating oil outlet (61b) is formed in the right end wall of the cylinder (61), and one end (left end) of the lubricating oil suction path (31) on the suction device (4) side is connected to the lubricating oil outlet (61b). .
A vent hole (61c) is formed on the left side of the peripheral wall of the cylinder (61), and one end (left end) is connected to the vent hole (51) of the auxiliary tank (5). The other end (right end) of the vent communication path (7) is connected.
In addition, an air release port (61d) is formed on the left side portion of the peripheral wall of the cylinder (61) so as to be located on the opposite side of the ventilation communication port (61c) in the one-diameter direction of the cylinder (6).

The piston (62) has a cylindrical shape having a diameter substantially equal to the inner diameter of the cylinder (61). The piston (62) is formed with a bottomed hole (621) having a circular cross section opened on the right end surface thereof.
A compression coil spring (63) constituting an urging member is accommodated in the bottomed hole (621) of the piston (62). The compression coil spring (63) has one end (right end) pressed against the inner surface of the right end wall of the cylinder (61) and the other end (left end) on the bottom of the bottomed hole (621) of the piston (62). It is pressed. The piston (62) is urged toward the left end wall of the cylinder (61) by the spring elastic force of the compression coil spring (63).
The piston (62) communicates with the lubricating oil inlet (61a) and the lubricating oil outlet (61b) when the piston (62) is moved to the right end side of the cylinder (61) by the suction pressure when the suction device (4) is operated. When the suction device (4) is stopped, the lubricating oil suction communication passage (62a) is moved to the left end side of the cylinder (61) by the spring elastic force (biasing force) of the compression coil spring (63) (biasing member). An air opening communication passage (62b) that connects the air communication port (61c) and the air opening port (61d) when formed is formed.
As shown in detail in FIG. 2, the lubricating oil suction communication passage (62a) includes the bottomed hole (621), a first annular groove (622) formed in the outer peripheral surface of the piston (62), and a first It is constituted by at least one (two in the figure) communication holes (623) formed in the bottom of the first annular groove (622) so as to communicate the annular groove (622) and the bottomed hole (621). ing. The first annular groove (622) is moved when the piston (62) is moved by the suction pressure of the suction device (4) to the right end position where the right end surface of the piston (62) contacts the inner surface of the right end wall of the cylinder (61). The piston (62) is formed at a required position in the longitudinal direction of the outer peripheral surface so as to communicate with the lubricating oil inlet (61a). When the piston (62) is in the right end position, the ventilation communication port (61c) and the air release port (61d) of the cylinder (61) are blocked by the outer peripheral surface of the piston (62).
As shown in detail in FIG. 3, the atmosphere release communication path (62 b) includes a second annular groove (624) formed on the left side of the first annular groove (623) on the outer peripheral surface of the piston (62). In the second annular groove (624), the piston (62) is moved to the left end position where the left end surface of the piston (62) is in contact with the inner surface of the left end wall of the cylinder (61) by the spring elastic force of the compression coil spring (63). In some cases, the outer circumferential surface of the piston (62) is formed at a required position in the longitudinal direction so as to communicate with the ventilation communication port (61c) and the air release port (61d). When the piston (62) is in the left end position, the lubricating oil inlet (61a) of the cylinder (61) is closed by the outer peripheral surface of the piston (62).
In the process of moving the piston (62) between the right end position and the left end position, the ventilation communication port (61c) and the air release port (61d) of the cylinder (61) are completely separated by the outer peripheral surface of the piston (62). The lubricating oil inlet (61a) and the lubricating oil outlet (61b) are not allowed to communicate with each other through the lubricating oil suction communication passage (62a) until the plug is closed. Therefore, when operating the suction device (4) to suck the lubricating oil (L), outside air does not flow into the auxiliary tank (5) from the vent hole (51), and the suction device (4) draws excess air. Since suction is not performed, the suction capability of the suction device (4) is not impaired.

In the lubricating oil recovery device (2) in the gear driven main shaft device (1) of the above embodiment, when the suction device (4) is operated, the piston (62) of the air release valve (6) is driven by the suction pressure. ) Is moved to the right end position of the cylinder (61) against the spring elastic force of the compression coil spring (63).
As a result, the lubricating oil inlet (61a) and the lubricating oil outlet (61b) of the cylinder (61) are communicated by the lubricating oil suction communication passage (62a) of the piston (62), and the cylinder (61) is vented. The communication port (61c) and the atmosphere opening port (61d) are blocked by the outer peripheral surface of the piston (62).
In this state, the lubricating oil (L) in the gear case (17) is sucked by the suction device (4) through the lubricating oil discharge port (171) and the lubricating oil suction passage (3), and is taken out from the gear case (17). (See FIGS. 1 and 2).
The lubricating oil (L) taken out from the gear case (17) is sent to a recovery tank (not shown) through the lubricating oil suction path (3), the suction device (4), and the lubricating oil recovery path (8).

On the other hand, when the gear-driven spindle device (1) is brought to an emergency stop, the lubricating oil supply pump and the suction device (suction pump) (4) are also stopped simultaneously.
Then, the lubricating oil remaining in the supply pipe from the supply pump flows down and accumulates in the gear case (17). Further, due to the stop of the suction device (4), the piston (62) of the air release valve (6) is moved to the left end position of the cylinder (61) by the spring elastic force of the compression coil spring (63). In addition, the lubricating oil inlet (61a) of the cylinder (61) is blocked by the outer peripheral surface of the piston (62), and the ventilation communication port (61c) and the atmosphere opening port (61d) of the cylinder (61) are connected to the piston (62 ) Through the atmosphere communication passage (62b).
As a result, the inside of the auxiliary tank (5) is released to the atmosphere through the vent (51), so the air (A) in the auxiliary tank (5) is released and the lubricating oil (L) accumulated in the gear case (17) is released. Part or all of the fluid flows into the auxiliary tank (5) from the lubricating oil discharge port (171) and is temporarily stored therein.
Therefore, according to the lubricating oil recovery device (2) of the above-described embodiment, even when the gear drive main shaft device (1) is in an emergency stop, the oil level of the lubricating oil (L) in the gear case (17) does not increase. The lubricating oil does not leak from the overflow lubricating oil discharge section (172).

  The present invention is suitably used as a lubricating oil recovery device for taking out and recovering the lubricating oil supplied into the gear case, for example, in a gear drive main shaft device or the like.

(1): Gear drive spindle
(17): Gear case
(171): Lubricating oil outlet
(2): Lubricating oil recovery device
(3): Lubricating oil suction path
(31): Lubricating oil suction path (pipe material) on the auxiliary tank side, lubricating oil suction path (pipe material) on the suction device side
(4): Suction device
(5): Auxiliary tank
(51): Vent
(6): Air release valve
(61): Cylinder
(61a): Lubricating oil inlet
(61b): Lubricating oil outlet
(61c): Ventilation port
(61d): Open to the atmosphere
(62): Piston
(62a): Lubricating oil suction passage
(62b): Open air communication passage
(63): Compression coil spring (biasing member)

Claims (2)

A lubricating oil recovery device for taking out and recovering the lubricating oil supplied into the gear case from a lubricating oil outlet formed in the lower part of the gear case,
A lubricating oil suction path with one end connected to the lubricating oil outlet;
A suction device connected to the other end of the lubricating oil suction path and sucking the lubricating oil in the gear case;
An auxiliary tank that constitutes a part of the lubricating oil suction passage and has an air vent at the top;
An air release valve that shuts off the inside of the auxiliary tank from the atmosphere when the suction device is operated, and allows at least a part of the lubricating oil in the gear case to flow into the auxiliary tank by opening the inside of the auxiliary tank through the vent when the suction device is stopped. And a lubricating oil recovery device. An air release valve is provided in the lubricating oil suction path between the auxiliary tank and the suction device, a piston movable in the cylinder in the axial direction, and disposed in the cylinder, and the piston faces one end of the cylinder. And a biasing member that biases
The cylinder has a lubricating oil inlet to which one end of the lubricating oil suction path on the auxiliary tank side is connected, a lubricating oil outlet to which one end of the lubricating oil suction path on the suction device side is connected, and one end of which is the vent of the auxiliary tank An air communication port connected to the other end of the air communication path connected to the air opening, and an air release port.
The piston includes a lubricating oil suction communication path that allows the lubricating oil inlet and the lubricating oil outlet to communicate with each other when the suction device is moved to the other end side of the cylinder by the suction pressure when the suction device is operated, and a biasing member when the suction device is stopped The lubricating oil recovery device according to claim 1, further comprising: an air opening communication passage that allows the air communication port to communicate with the air opening when moved to one end side of the cylinder by the urging force.

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