JPH0571543A - Introducing device for lubricating agent - Google Patents

Abstract

PURPOSE:To secure the lubricating action of rolling balls by sending the grease as lubricating agent which is introduced into a bearing part under pressure, to the rolling balls by the revolution of propeller fixed on a shaft. CONSTITUTION:A bearing part 15 is constituted of a bearing which consists of an outer race which supports a shaft 17A as rotary by rolling balls, and an inner race and a chamber 37 for accommodating the bearing. The inside of the bearing part 15 is charged with grease 57 as lubricating agent, and a propeller 33 for sending grease 57 under pressure in one direction to the bearing part 15 even in the normal and reverse revolutions of the shaft is fixed installed on the shaft 17A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for feeding a lubricant, particularly a grease, to a bearing portion which supports a shaft which is a rotating body.

[0002]

2. Description of the Related Art Conventionally, the supply of grease to a bearing portion of a rotating portion is well known to those skilled in the art, but there has been no device for positively feeding the grease to the bearing portion.

Further, in the past, if the amount of grease filled is too large, the temperature rises greatly, causing leakage due to softening of the grease.
It is said that deterioration of lubrication performance is caused by deterioration such as oxidation, but nowadays there are many high-quality greases with excellent heat resistance, so the filling amount is 30% to 60% of the space volume of the housing, which is a standard. 70% to 90%.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a device for positively feeding grease into a bearing portion.

[0005]

Means for Solving the Problems The present inventor has conducted various researches and studies in order to solve the above problems. As a result, even if grease is supplied, the grease is pushed out from the orbits of rolling balls unless an appropriate pressure is applied. It has been found that it is difficult to maintain an effective lubricating action.

Therefore, the device of the present invention is based on the above points, and as shown in FIG. 1, the shaft 1 which is a rotating body.
The bearing portion 15 is composed of a bearing formed of an outer ring supporting 7A, a rolling ball and an inner ring, and a chamber 37 accommodating the bearing, and the bearing portion 15 is filled with grease 57 as a lubricant. Grease 57 on shaft 17A
Is fixed to the bearing portion 15 by a propeller 33 that is pressure-fed in one direction even when the shaft 17A rotates in the forward and reverse directions.

[0007]

When the shaft 17A is rotated, the propeller 33 fixed to the shaft 17A is rotated, so that the grease 57 is pressure-fed to the bearing portion 15 and pushed out from the orbit of the rolling ball regardless of whether the shaft 17A rotates normally or reversely. The grease 57 that has been removed is returned to its raceway, and a thin oil film is always formed on the rolling surface and the sliding surface of the bearing to prevent the metal surfaces from directly contacting each other, thereby prolonging the life of the bearing. Become.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front sectional view showing the structure of an embodiment of the present invention when applied to an elevator, FIG. 2-A is a perspective view showing an example of a propeller according to the present invention, and FIG. FIG. 3 is a development view and FIG. 3 is an explanatory perspective view showing the configuration of an example of an elevator to which the device of the present invention is applied.

In FIG. 3, reference numerals 4 and 10 denote upper and lower support plates, and between these upper and lower support plates 4 and 10, ball screws whose both ends are rotatably supported by bearings 15 and 16 at the center. On both sides of the ball screw 17 and the ball screw 17, guide rods 11, 11 having opposite ends fixed thereto are vertically provided. Reference numeral 12 denotes an elevating member, which moves up and down along the guide rods 11 and 11 by the rotation of the ball screw 17 to convey the conveyed object in the vertical direction. Reference numerals 13 and 13 denote ball bush bearings provided between the guide rods 11 and 11 and both ends of the elevating member 12, and 14 denotes a ball nut provided between the ball screw 17 and the central portion of the elevating member 12.

A fixed base 5 is fixed on the upper support plate 4,
A servomotor 8 having an encoder 7 is fixed on the fixed base 5, and a drive shaft 9 of the servomotor 8 is connected by a coupling 19 to a shaft 17A of a ball screw 17 penetrating the permanent brake 18. .. The permanent brake 18 is fixed to the brake mounting base 36, and the grease cup 55 and the interior of the chamber of the brake mounting base 36 are connected via a joint 39 to a grease supply tube 38.
Are in communication with each other.

The present embodiment is applied to the bearing portion 15 in the elevator having such a structure.

In FIG. 1, a stepped hole 20 and a chamber 37 are formed in the upper support plate 4 and the brake mounting base 36, respectively, through which the ball screw 17 is inserted and the bearing portion 15 is formed. The bearing portion 15 is fixed together with the propeller 33 to the screw 17a of the shaft 17A of the ball screw 17 by a nut 35 through a washer 34, the inner ring 28, the rolling ball 2
6a and an outer ring 27 having an inner diameter larger than the outer diameter of the shaft 17A so as not to come into contact with the shaft 17A and supported by a thrust cap 29, and the thrust cap 29 is supported together with the upper surface of the upper support plate 4. The outer ring 23, a rolling ball 22 a, and a radial ball bearing 22 formed of an inner ring 25.

The lower peripheral surface of the outer ring 23 of the radial ball bearing 22 is brought into contact with the step plane 21 of the stepped hole 20, and the outer peripheral surface of the outer ring 23 is appropriately fitted to the inner wall surface 24 of the stepped hole 20. Have been combined. The inner ring 25 of the radial ball bearing 22 supports the shaft 17A of the ball screw 17 with proper fitting. The thrust cap 29, which supports the thrust ball bearing 26, includes the upper peripheral surface of the outer ring 23 of the radial ball bearing 22 and the upper support plate 4.
The upper support plate 4 is provided with a recess 31 so as to be supported by contacting the upper surface of the inner ring 25 and not to contact the inner ring 25.

The inner ring 28 of the thrust ball bearing 26 is placed on the rolling ball 26a, and the inner diameter of the inner ring 28 is set so as to be fitted appropriately to the screw 17a provided on the shaft 17A of the ball screw 17. On the inner ring 28 of the thrust ball bearing 26, a propeller 33 is attached via a washer 34 to the ball screw 17.
It is fixed by tightening the nut 35 screwed to the screw 17a.

A thrust cap 29 is sandwiched between the inner step portion of the brake mount 36 of the permanent brake 18 and the upper support plate 4. A grease supply tube 38 is attached to a side surface of the brake mount 36 via a joint 39, and is connected to the chamber 37.

The permanent brake 18 is mounted on the brake mount 36, and the boss 42, which is in contact with the friction plate 40 via the plate spring 41, is fixed to the shaft 17A of the ball screw 17 penetrating therethrough by the set screw 43. Has been. The permanent magnet 18 has a built-in permanent magnet, and when a current is not passed through the built-in electromagnetic coil, the friction plate 40 is attracted by the attractive force of the permanent magnet, and the ball screw 17 is braked and held stationary.

This is a problem that occurs due to the structure of the lifting device, and is intended to prevent the falling and turning of the lifting member 12 due to the weight thereof in a disconnected state, for example. Therefore, by energizing the built-in electromagnetic coil, a magnetic pole opposite to the permanent magnet is generated, and the attraction force is canceled, so that the attraction of the friction plate 40 is released. At the same time, braking power is applied to the servo motor 8 and the elevating member 12 maintains a predetermined position. Regarding the rotation of the servo motor 8, a required control system,
Numerical control is performed by the generated signal from the encoder 7.

The coupling 19 includes a boss 45 provided on the circular seat 44, a plurality of radial claws 46, a set screw 47 for fixing the boss 45 to the drive shaft 9, and a circular seat 48.
It includes a boss 49 provided on the base, a plurality of claws 50 radially, and a set screw 51 for fixing the boss 49 to the screw 17a of the ball screw 17. The coupling 19 is made of an elastic material 5 having a required hardness between the claws 46 and 50 which are alternately arranged.
By sandwiching 2 and absorbing the vibration, the rotation is transmitted from the drive shaft 9 to the ball screw 17.

In the present embodiment, the radial ball bearing 22 and the thrust ball bearing 26 are combined in order to prolong the life of the bearing portion 15. This is because the ball bearings 22 and 26 do not lose their set functions, and by sufficiently supplying the lubricant, the rolling parts and the sliding parts are extremely less worn and, therefore, a longer life can be achieved. it can.

Next, the operation of each ball bearing 22, 26 will be described. As shown in FIG. 1, the weight of the lifting member 12 and the lifting member 12 are attached to the ball screw 17 supported in a suspended manner.
When the weight of the transported object (not shown) placed on the table, the sliding force of the sliding portion, and the self-weight of the ball screw 17 are combined, the load weight FR (see FIG. 1) is about 59 kg. Although it operates at a speed, the corresponding angular contact ball bearing may have a short life.

The load weight FR is determined by the nut 3 through the ball screw.
5, washer 34, propeller 33, inner ring 28, rolling ball 26
The outer peripheral surface of the outer ring 27 and the thrust cap 29 contacts the upper peripheral surface of the outer ring 23, and the lower peripheral surface of the outer ring 23 is supported by the step plane 21. That is, load weight F
Although R is shown intensively as shown by the arrow 53, it is actually evenly divided on the step plane 21. As described above, in this case, only the outer ring 23 of the radial ball bearing 22 receives the load weight. That is, it is the thrust ball bearing 26 that rotates under the load weight.

Next, when a radial force is applied, lateral pressure acts on the ball screw 17 and the inner ring 25 of the radial ball bearing 22, and the inner wall surface 24 passes through the rolling balls 22a and the outer ring 23.
Will be received in. That is, when the lateral pressure is generated as shown by the arrow 54, only the radial ball bearing 22 acts.

The shaft 17A of the ball screw 17 and the inner ring 25
Since there is a margin of 10 μm to 15 μm for fitting with, the inner ring 25 always maintains the equilibrium state with the outer ring 23 via the rolling balls 22a, and therefore, almost no force in the thrust direction is received. As can be seen from the above, since the action of the inner ring and the outer ring on the rolling balls is the pressure contact force from the upper and lower sides or the left and right sides, the rolling balls follow only the rotation direction of the shaft 17A, so that the rolling is performed reasonably.

The supply of grease 57, which is a lubricant, will be described below. The grease filled in the grip cup 55 shown in FIG. 3 is injected into the chamber 37 in the arrow 64 direction shown in FIG. 1 by rotating the cap 56 in the arrow direction a specified number of times. Note that the radial ball bearing 22, the thrust cap 29, and the thrust ball bearing 26 have already been used.
Since a required amount of grease has been slid in when assembling, the grease cup 55 is replenished only by an additional amount and periodically replenished with the setting of the operating time.

As shown in FIG. 1, the thrust cap 29 is provided with notches of a required size at several places on its outer circumference to form a grease inflow passage 58. As described above, the supplied grease 57 is pushed out of the thrust ball bearing 26 while the thrust ball bearing 26 is rotating, and cannot be returned into the start while the thrust ball bearing 26 is stopped. This is a problem with viscosity. When the viscosity is lowered, it leaks even from a small gap, so it is soft but has low fluidity so that it does not leak in the use posture.

Therefore, since the fluidity is low, the grease 57 extruded is difficult to return. In order to solve the above problems, as shown in FIG. 1, a propeller 33 that is integrated with the ball screw 17 and that rotates the ball screw 17 in the forward or reverse direction is provided. FIG. 2A is a perspective view of the propeller 33,
FIG. 2B is a development view thereof. The propeller 33 has a deformed shape, and is an aggregate just like a butterfly with its wings spread. Figure 2
The required metal plate is processed as shown in the development view of (B), and the dotted line 6
The blade portions 60 and 61 are formed by bending and bending from 2 to the plane portion 59 in the same direction. A hole 63 is provided at the center.

As shown in FIG. 1, when the propeller 33 in the chamber 37 is buried in the grease 57 and the ball screw 17 rotates in the direction of the solid line arrow, a thrust is generated on the slope of the blade 61, and the thrust causes the grease. Send in 57. Due to the relationship between the speed of rotation of the ball screw 17 and the viscosity of the grease 57, the rolling balls 26a, 22 are always applied by applying pressure even if they are not pushed back to their original positions.
a and the grease 57 come into contact with each other, and the rolling balls and their orbits are covered with a thin layer of grease. Further, when rotating in the direction of the dotted arrow, the slope of the blade portion 60 functions similarly to the slope of the blade portion 61.

As described above, the lubricant can be constantly replenished to the rotating member near the ball bearing of the shaft, which is the rotating body, or in the chamber by a simple pressurizing device for the lubricant, and a long life can be secured. Be done.

[0029]

As described above, according to the present invention, the bearing portion 15 is formed by the bearing formed of the outer ring, the rolling ball and the inner ring which support the shaft 17A which is the rotating body, and the chamber 37 which accommodates the bearing. A propeller 33 configured to fill the bearing portion 15 with grease 57 as a lubricant and to feed the grease 57 to the shaft portion 17A in one direction even when the shaft portion 17A rotates in the forward and reverse directions. Since it is fixed, the life of the entire device that incorporates this device can be extended to the extent that it does not need to be replaced until it reaches the end of its service life.Furthermore, since there are few failures, the time required for maintenance is extremely small. Not only can this be achieved, but the reliability of the entire device can be improved.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a configuration when an embodiment of the device of the present invention is applied to an elevator.

FIG. 2A is a perspective view showing an example of a propeller according to the present invention, and FIG. 2B is a development view showing an example of a propeller according to the present invention.

FIG. 3 is an explanatory perspective view showing the configuration of an example of an elevator to which the device of the present invention is applied.

[Explanation of symbols]

 15 Bearing Part 17 Ball Screw 17A Shaft 17a Screw 20 Stepped Hole 21 Step Plane 22 Radial Ball Bearing 22a Rolling Ball 23 Outer Ring 24 Inner Wall 25 Inner Ring 26 Thrust Ball Bearing 26a Rolling Ball 27 Outer Ring 28 Inner Ring 29 Thrust Cap 31 Lap 34 Seat 33 35 Nuts 36 Brake Mounts 37 Chambers 38 Grease Supply Tubes 39 Joints 55 Grease Cups 56 Caps 57 Greases 58 Grease Inflow Paths 59 Planes 60 Blades 61 Blades 63 Hole

[Procedure amendment]

[Submission date] June 24, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Procedure amendment]

[Submission date] August 6, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Patent application title: Lubricant delivery device

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (3)

[Claims] 1. A bearing portion (15) is composed of a bearing formed of an outer ring, a rolling ball and an inner ring supporting a shaft (17A) which is a rotating body, and a chamber (37) accommodating the bearing. The bearing (15) is filled with grease (57) as a lubricant, and the shaft (17A) is filled with the grease (57) when the shaft (17A) is rotated in the forward and reverse directions. Propeller (3
Lubricant feeding device formed by fixing 3). 2. The bearing (15) comprises an inner ring (28) fixed to a shaft (17A) together with a propeller (33) and a rolling ball (2).
6a) and a shaft (17A), and a thrust ball bearing (26) comprising an outer ring (27) supported by a thrust cap (29), an outer ring (23) supporting the thrust cap (29), and a rolling ball. (22a) and inner ring (2
5. The lubricant feeding device according to claim 1, comprising a radial ball bearing (22) consisting of 3. An inflow passage (58) for communicating grease (57) from the thrust ball bearing (26) into the radial ball bearing (22) and a recess (31) in communication with the chamber (37) are provided in the thrust cap (29). The lubricant feeding device according to claim 2, which is provided.