JP4692385B2 - Rolling bearing device - Google Patents

Description

  The present invention relates to a rolling bearing device, and more particularly to a rolling bearing device having a lubrication function.

  Conventionally, as a rolling bearing device of this type, there are a rolling bearing having a plurality of rolling elements interposed between a stationary race member, a rotating race member, and both race members, a lubricating oil tank for storing lubricating oil, and a rolling bearing. There are known ones that include a nozzle that opens in an annular space between the two raceway members, a pump that supplies lubricating oil in a lubricating oil tank to the nozzle, and a pump drive unit that drives the pump (for example, a patent). Reference 1).

In this conventional rolling bearing device, lubricating oil is dropped through a nozzle to lubricate the inside of the rolling bearing.
JP 2004-108388 A

  In the conventional rolling bearing device described above, the amount of lubricating oil used is reduced by supplying lubricating oil as needed from a nozzle that opens in the annular space between both raceway members, but the capacity of the tank is limited. Therefore, it is necessary to reduce the amount used and to lubricate more efficiently.

  An object of the present invention is to provide a rolling bearing that can efficiently lubricate, reduce the amount of lubricating oil used, reduce the rotational torque and heat generation of the bearing, and reduce the environmental load. .

Rolling bearing unit according to the invention this is fixed side raceway member, a rolling bearing having a plurality of rolling elements interposed between the rotary-side raceway member and both raceway member, and the lubricating oil tank for storing lubricating oil, the rolling bearing In a rolling bearing device including a nozzle that opens in an annular space between both raceway members, a pump that supplies lubricating oil in a lubricating oil tank to the nozzle, and a pump drive unit that drives the pump, the nozzle is cylindrical The nozzle body includes a nozzle and a lubricating oil holding portion that is provided in a protruding shape at the tip of the main body and holds the lubricating oil by utilizing the viscosity and surface tension of the lubricating oil. The lubricating oil holding portion includes a plurality of claw-like protruding portions. The oil droplets held by the plurality of claw-shaped protrusions that are formed to be protruded from the gaps between the plurality of claw-shaped protrusions are in contact with the rolling elements. To do .

This invention is intended to efficiently lubricate the rolling bearing, to hold the oil droplets of the lubricating oil to the tip of the nozzle by utilizing the viscosity and surface tension of Jun Namerayu, the held oil droplets It contacts the required part.

The lubricating oil holding portion, may be the nozzle body and the piece, but it may also be separate from.
The required portion of the rolling rising bearings, a position at which require lubrication oil, the rolling elements, rolling element near the rotating side raceway member, are such as rolling element near the cage. The plurality of claw-shaped protrusions are attached to the tip of the nozzle so as to contact a required portion of the rolling bearing.

  The rolling bearing is, for example, an angular ball bearing, but may be another type of deep groove ball bearing, roller bearing, or the like.

  The nozzle may be connected to the pump directly or via a conduit, and the pump may also be connected to the lubricant tank directly or via a conduit.

  The lubricating oil tank is preferably installed in the rolling bearing, for example, on the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring, which is a fixed-side raceway member, but may be installed outside the rolling bearing.

  The opening of the nozzle is exposed in the vicinity of the rolling element or the raceway member of the rolling bearing.

  The pump is provided between the lubricating oil tank and the nozzle, and sucks the lubricating oil from the lubricating oil tank and supplies it to the nozzle.

The lubricating oil supplied to the nozzle by the pump is controlled to a predetermined amount (a very small amount), and since the viscosity of the lubricating oil is high , the lubricating oil is held in a substantially spherical oil droplet state between the plurality of claw-shaped protrusions by surface tension. , part of the oil droplets Ru allowed to protrude from the claw-like projections. By protruding the oil droplets this is in contact with the desired portion of the rolling bearing, the lubricating oil is supplied to a required portion of the rolling bearing.

Therefore, by providing a slight gap between the tip of the protrusion and the location where the lubricant is required on the rolling bearing, only the oil droplets are brought into contact with the location where the lubricant is required without bringing the protrusion into contact with the rolling bearing. It is Ru can.
Also, that part of the oil droplets of the lubricating oil from protruding from the gap between the claw-like projections by surface tension, the oil droplets become larger, the oil droplets are likely to contact the area in need of lubrication of the rolling bearing . The number of the claw-shaped protrusions is, for example, two, but is not limited thereto, and may be three or more. The claw-shaped protrusion can be formed, for example, by cutting off the tip of the cylindrical nozzle body so that the claw-shaped protrusion remains. Each claw-like protrusion may be a part of a cylinder (straight) having the same shape as the nozzle body, or may be tapered. The interval between the protrusions is appropriately adjusted so that the oil droplets become larger.

In the rolling bearing device according to the present invention, the rolling element is a ball.
The pump, for example, one end of the nozzle is placed in the pump chamber, the piezoelectric element is attached to the diaphragm, a simple diaphragm pump structure is used. In this case, lubricating oil is sent from the tank to the nozzle by pulsating the diaphragm with the piezoelectric element. In addition to the diaphragm pump, various pumps such as an injection pump, a vane pump, a screw pump, and a piezo pump can be used.

  When the lubricating oil tank is installed in the rolling bearing, the pump can be installed in contact with the outer surface of the lubricating oil tank. When the lubricating oil tank is installed outside the rolling bearing, the pump may be installed either inside or outside the rolling bearing. When the pump is installed outside the rolling bearing, if the length of the nozzle is too long and the lubricating oil is cold, it will be generated by the pump due to the lubricating oil remaining in the nozzle even if the number of pump operations is increased. The pulsation of the lubricating oil is attenuated and the lubricating oil is difficult to be discharged. Therefore, the pump is arranged in the vicinity of the rolling bearing so that the length of the nozzle does not become too long.

  The pump drive unit includes a control circuit that controls the pump so that the amount of lubricant supplied is constant. The pump drive unit may be installed either inside or outside the rolling bearing, but when the lubricating oil tank and the pump are installed in the rolling bearing, it is preferable that the pump driving unit is also installed in the rolling bearing.

  The rolling bearing device can incorporate an alarm device for notifying the abnormal temperature of the lubricating oil, a monitoring device for an excess or shortage of the lubricating oil in the rolling bearing, and the like.

According to the rolling bearing apparatus of this invention, lubricating oil, to be supplied to the parts requiring lubrication can be prevented by the centrifugal force generated by the rotation, the lubricating oil is flicked. Therefore, since it can be efficiently lubricated with a small amount of lubricating oil, the amount of the lubricating oil used can be reduced, the rotational torque and the heat generation amount of the bearing can be reduced, and the environmental load can be reduced.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of the present invention. In the following description, the upper and lower sides refer to the upper and lower sides of the drawings.

  In FIG. 1, a rolling bearing device includes a rolling bearing (1), a lubricating oil tank (2) built in the rolling bearing (1), and a nozzle (3 for supplying lubricating oil to the rolling bearing (1). ), A pump (4) for supplying lubricating oil to the nozzle (3), and a pump drive unit (5) for driving the pump (4).

  The rolling bearing (1) is a ball bearing on which the inner ring (rotating side raceway member) (11) rotates. The outer ring (fixed side raceway member) (12), the inner ring (11), the inner / outer ring (11) ( 12), a plurality of balls (rolling elements) (13) interposed at regular intervals in the circumferential direction, and a cage (14) that holds the plurality of balls (13) at equal circumferential intervals. The inner ring (11) and the outer ring (12) are formed with tank installation extensions (11a) and (12a) in addition to the part for holding the balls (13).

  The lubricating oil tank (2) has an arc shape when viewed from the axial direction, and is detachably attached to the lower part of the inner peripheral surface of the tank installation extension (12a) of the outer ring (12).

  The pump (4) is a diaphragm pump in which a piezoelectric element is attached to the diaphragm, and one end (base end) of the nozzle (3) is placed in the pump chamber.

  The nozzle (3) has a thin cylindrical shape, extends from the pump (4) to the ball (13), and a brush-like member (30) as a lubricating oil holding member is provided at the tip thereof. The brush-like member (30) is formed of a large number of thin threads, and is attached to the tip of the nozzle (6) with an adhesive. The tip of the brush-like member (30) is positioned so as to contact the ball (13) when the ball (13) moves. The pump (4) sucks the lubricating oil from the lubricating oil tank (2) and supplies the lubricating oil to the nozzle (3). The lubricating oil that reaches the tip of the nozzle (3) penetrates the brush-like member (30) and is held by the member (30). Therefore, when the revolving ball (13) passes through the installation position of the brush-like member (30), the tip of the brush-like member (30) comes into contact with the ball (13), thereby supplying the lubricating oil. .

  The pump drive section (5) is provided with a control circuit for driving the pump (4) and controlling the number of operations.

  In the above embodiment, any member capable of penetrating lubricating oil can be used as a lubricating oil holding member instead of the brush-like member (30), and sponge, felt, etc. are used as the lubricating oil holding member.

FIG. 2 shows an embodiment different from the first embodiment . In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 2, the rolling bearing device includes a rolling bearing (1), a lubricating oil tank (2) built in the rolling bearing (1), and a nozzle (6) for supplying lubricating oil to the rolling bearing (1). ), A pump (4) for supplying lubricating oil to the nozzle (6), and a pump drive unit (5) for driving the pump (4).

  The nozzle (6) has a thin cylindrical shape, and includes a main body (26) extending from the pump (4) to the ball (13), and a lubricating oil holding portion (27) provided at the tip of the main body (26). . The lubricating oil retaining part (27) is formed by two claw-like protrusions (27a) arranged opposite to the front end of the main body (26). The tip of the claw-like projecting portion (27a) is positioned so as to be as close to the ball (13) as possible without contacting the ball (13). The pump (4) sucks the lubricating oil from the lubricating oil tank (2) and supplies the lubricating oil to the main body (26) of the nozzle (6). The lubricating oil that has reached the tip of the main body (26) of the nozzle (6) grows out of the gap existing between the claw-shaped protrusions (27a), and as shown in FIG. ). Therefore, when the revolving ball (13) passes in the vicinity of the lubricating oil holding part (27), the oil droplet (D) comes into contact with the ball (13), whereby the lubricating oil is supplied.

  The tip of the claw-like protrusion (27a) of the nozzle (6) is positioned so that the oil droplet (D) held by the lubricant holding part (27) contacts the ball (13). The oil droplet (D) held in the lubricating oil holding part (27) may be positioned so as to contact the inner ring (11) or the cage (14). Further, the shape of the lubricating oil retaining portion (27) can be changed to various shapes capable of retaining the lubricating oil in the form of oil droplets.

  In the rolling bearing device of each of the embodiments described above, since lubricating oil is applied directly to the balls (13) of the rolling bearing (1), the balls (13), the inner ring (11), and the outer ring (12) on which the lubricating oil rotates. You can lubricate between them. As a result, the amount of lubricating oil used can be reduced, and the lubricating oil in the bearing (1) can also be reduced, so that the rotational torque and heat generation of the bearing can be reduced, and the environmental load can be reduced.

  In each of the above embodiments, the stationary race member is the outer race (12). However, the inner race (11) may be the stationary race member and the outer race (12) may be the rotation race member.

Figure 1 is an essential part longitudinal cross sectional view showing an embodiment of a rolling bearing device according to the invention of this. Figure 2 is an essential part longitudinal cross sectional view showing another embodiment of the rolling bearing device according to the invention of this. Figure 3 is an enlarged view of a case of holding the oil droplets of the rolling bearing device according to the invention of this.

(1) Rolling bearing
(2) Lubricating oil tank
(3) (6) Nozzle
(4) Pump
(5) Pump drive
(11) Inner ring (rotating raceway member)
(12) Outer ring (fixed raceway member)
(13) Ball (rolling element)
(26) Nozzle body
(27) Lubricating oil holding part
(27a) Claw-shaped protrusion
(30) Brush-like member (lubricant holding member)

Claims (2)

In the annular space between the fixed-side raceway member, the rotary-side raceway member, and a rolling bearing having a plurality of rolling elements interposed between the raceway members, a lubricating oil tank for storing lubricating oil, and the rolling bearings. In a rolling bearing device including an opening nozzle, a pump for supplying lubricating oil in a lubricating oil tank to the nozzle, and a pump driving unit for driving the pump, the nozzle protrudes from a cylindrical nozzle body and a tip of the body. Provided with a lubricating oil holding portion that holds the lubricating oil by utilizing the viscosity and surface tension of the lubricating oil, and the lubricating oil holding portion is formed by a plurality of claw-shaped protrusions, A rolling bearing device, characterized in that oil droplets held by a plurality of claw-like protrusions that are enlarged to protrude from the gaps between the protrusions are in contact with the rolling elements . The rolling bearing device according to claim 1 , wherein the rolling element is a ball .

Images