JPH0619856Y2 - Lubrication structure of linear guide device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an oil supply structure for a ball train of a linear guide device mounted on a base with an inclination.

[Conventional technology]

Oil may be supplied to the ball train in the linear guide device in the case of supplying grease or in the form of liquid oil. Generally, oil is supplied by a centralized lubrication system that is used in automated lines where it is difficult to supply grease. Applied to the lubrication system.

[Problems to be solved by the device]

However, oil is less viscous and fluid than grease. Therefore, for example, when a three-axis table T of X, Y, Z for transporting the tool head M of the machine tool is attached to the tilt base D with a slope α as shown in FIG. Depending on the position, some parts cannot be refueled. Now, looking at the linear guide device constituting the Y axis in the figure, it is as shown in FIG. That is, there is the oil supply port 3 on the upper end surface of the slider 2 that is bridged over the guide rail 1,
The branch oil supply passage 4 inside is divided up and down. Therefore, the supplied oil flows only downward and is not supplied to the upper row of balls.

In this case, an oil supply port to the ball row above the slider 2,
If a separate oil supply port for the lower ball row is provided, it is possible to supply oil to the upper ball row, but the oil supply pipe is complicated and troublesome.

The present invention has been made in view of such a conventional problem, and for a linear guide device installed with a slope, only one lubrication port is used to lubricate both upper and lower ball rows. It is an object of the present invention to provide a lubrication structure of a linear guide device capable of achieving the above.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a guide rail that has an axial ball rolling groove on the side surface and is extended, and a ball rolling groove that faces the ball rolling groove of the guide rail. And a slider having a linear ball return path parallel to the ball return path and a semi-doughnut-shaped curved path connecting the ball return path and the ball rolling groove at an end, and the two ball rolling paths facing each other. In a linear guide device having a groove, a ball return passage, and a large number of balls rotatably inserted in a curved road, and the guide rail is mounted at an inclination, a recess is formed on the surface of the slider facing the guide rail upper surface. And the recess is covered with a sealing plate to form an oil reservoir, and an oil supply hole communicating with the oil reservoir is provided on the outer surface of the slider, and the sealing plate is made to correspond to the gradient and on both sides of the slider. Ball rolling groove And an outlet for the lubricating oil in the oil sump is formed.

[Action]

The oil supplied into the oil reservoir of the linear guide device installed with a gradient overflows from the two outlets and uniformly lubricates the ball rows in the ball rolling grooves on both sides of the slider.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the present invention.

The guide rail 1 has a square cross section, and two ball rolling grooves 11 are formed in parallel at symmetrical positions on the left and right outer side surfaces of the guide rail 1 and are arranged to be inclined at a gradient α. The slider 2 is composed of a slider body 2A and end caps 2B that close the front and rear ends thereof. The slider body 2A is formed in a U shape by the upper surface plate portion 2a and the sleeve portions 2b hanging from both ends thereof. The guide rail 1 is provided on the inner surface of the sleeve portion 2b.
A ball rolling groove 12 having a semicircular cross section is formed at a position opposed to the ball rolling groove 11. A linear ball return passage 13 parallel to the ball rolling groove 12 is formed in the thick portion of the sleeve portion 2b. The ball rolling groove 12 and the ball return passage 13 are communicated with each other through a semi-doughnut-shaped curved passage 14 formed in the end cap 2B. A large number of balls 15 are rotatably inserted into the ball rolling grooves 11 and 12, the ball return passage 13 and the curved passage 14 which face each other.

On the inner surface side of the upper surface plate portion 2a of the slider 2, that is, on the surface facing the upper surface 1a of the guide rail 1, a recess 16 as an oil reservoir is formed. The oil sump 16 has a substantially full lateral width between the inner side surfaces of the sleeve portion 2b and is a relatively shallow prismatic shape.

Reference numeral 17 denotes a sealing plate that covers the oil sump 16, and is attached to the inner surface of the upper surface plate portion 2a of the slider 2 by adhesion or other known sealing means, and the small screw 20 is tightened to be attached. The sealing plate 17 is provided for the outlet 2 of the lubricating oil stored in the oil sump 16.
It has two 1s. Each outflow port 21 is provided at a position close to the ball rolling groove 12 on both sides of the slider body 2A. Further, a straight line L connecting the two outlets 21 at an angle makes an angle α with the axis Y-Y. This makes Y
This corresponds to the inclination of the shaft guide rail 1.

An oil supply port 3 to which an oil supply pipe P is connected is formed on the upper end surface of the end cap 2B of the slider, and the oil supply port 3 and the oil sump 16 are connected to each other by an oil supply passage 22 provided axially inside.

Next, the operation of the above embodiment will be described.

The slider 2 is moved in the axial direction of the guide rail 1. Then, the ball 15 moves in the direction opposite to the moving direction of the slider 2 with respect to the slider 2 in the ball rolling path formed by the ball rolling groove 11 of the guide rail and the ball rolling groove 12 of the slider. Then, it enters the curved path 14 of the end cap 2B at one end side, makes a U turn along the curved path 14 and passes through the ball return path 13, and makes a U turn again at the curved path 14 of the end cap 2B on the opposite side to make a ball rolling path. Move in and circulate. This allows the slider 2 to move very lightly.

Lubricating oil is fed to the slider 2 from the oil supply pipe P of the centralized oil supply device through the oil supply port 3 and the oil supply passage 22 into the oil reservoir 16 in a fixed amount. Since the oil level in the oil sump 16 is kept horizontal, an equal amount of oil overflows from the two outlets 21 and the ball rows in the ball rolling grooves 12 at the adjacent positions are continuously automatically lubricated. To be done. Thus, according to this embodiment, the ball rows on both sides, which are in a vertical positional relationship, can be refueled in equal amounts on average.

It should be noted that the oil sump 16 itself is standardized with a common size and shape (both can be arbitrarily set) and is formed in the slider 2 in advance so that only the outlet 21 of the sealing plate 17 corresponds to the inclination of the linear guide device. If you open it up, you can meet the demand immediately.

Further, the formation of the oil reservoir 16 is not limited to the case where the rectangular shallow recess is directly processed on the inner surface of the slider 2. For example, the opening on the upper surface side may be closed after the through hole is formed in the upper surface plate portion 2a of the slider.

Further, the position of the fuel filler port 3 is not limited to the upper end surface of the end cap 2B. The lower end surface or the side surface of the end cap 2B is appropriately set in consideration of the relationship between the relative position of the oil supply pipe P and each slider 2 and the inclination direction.

Further, although the Y-axis linear guide device has been described, the same technical idea can be applied to the X-axis linear guide device.

[Effect of device]

As described above, according to the present invention, a recess is provided in the surface of the slider facing the upper surface of the guide rail, and the recess is covered with a sealing plate to form an oil sump. An oil supply hole communicating with the oil reservoir is provided on the outer surface of the slider, and a lubricating oil outlet is formed on the sealing plate. Moreover, the outflow ports are provided at positions close to the ball rolling grooves on both sides of the slider, corresponding to the gradient of the linear guide device. Therefore, it is possible to provide a linear guide device capable of supplying oil to both upper and lower ball rows with only one oil supply port for a linear guide device installed with a slope.

[Brief description of drawings]

FIG. 1 is a plan view showing a notched part of an embodiment of the present invention, FIG. 2 is a front view showing a right half of an end cap as seen from an axial direction, and FIG. FIG. 4 is a side view showing an example of usage of the linear guide device, and FIG. 5 is a plan view showing an oil supply structure of the conventional linear guide device. 1 is a guide rail, 2 is a slider, 2A is a slider body,
3 is a filler port, 11 is a ball rolling groove (of the guide rail), 1
2 is a ball rolling groove (of the slider), 13 is a ball return passage, 14 is a curved passage, 15 is a ball, 16 is an oil reservoir, 17 is a sealing plate, 21 is an outlet, and 22 is an oil supply passage.

Claims (1)

[Scope of utility model registration request] 1. A guide rail which has a ball rolling groove extending in the axial direction on the side surface and extends, and a ball rolling groove which faces the ball rolling groove of the guide rail on the side surface, and is parallel to this. A linear ball return passage, a slider having a semi-doughnut-shaped curved path connecting the ball return passage and the ball rolling groove at an end, and the opposing ball rolling grooves.
A linear guide device having a ball return passage and a large number of balls rotatably inserted in a curved passage, wherein the guide rail is mounted at an inclination, wherein a recess is formed on a surface of the slider facing the guide rail upper surface. An oil reservoir is provided by covering the recess with a sealing plate to form an oil reservoir, and an oil supply hole communicating with the oil reservoir is provided on the outer surface of the slider. An oil supply structure for a linear guide device characterized in that an outlet for lubricating oil in an oil reservoir is formed so as to approach each of the moving grooves.