JP5840916B2 - Lubrication structure of bearing - Google Patents

Description

  The present invention relates to a bearing lubrication structure that lubricates a bearing with grease (semi-solid lubricant).

Conventionally, in order to lubricate the bearing, in addition to sealing grease inside the bearing, a grease filling chamber is provided near the bearing, and the grease filling chamber is filled with grease. Since the maintenance of the bearings of the main motor of a railway vehicle is very troublesome, it is desired to save labor.
In general, since the bearings of main motors are often used at high speeds and high temperatures, the deterioration of grease (semi-solid lubricant) is promoted and the lubrication life is reached relatively early. For this reason, in some main motors, the grease filling chamber is initially filled with grease leaving a certain amount of space, and a certain time or mileage has elapsed since the start of use (for example, A method called intermediate lubrication is carried out in which additional grease is filled in this space at the time of traveling for 600,000 km.

In conventional bearing lubrication structures, it is necessary to reduce the amount of grease in the vicinity of the bearing to be initially sealed in order to secure a space for additional filling of grease during intermediate lubrication. If the amount is too small, there is a problem of poor lubrication before intermediate lubrication. In this case, it is conceivable that grease is filled in a portion in contact with the bearing in the vicinity of the bearing, and a space for additional filling of grease is provided in a portion far from the surface in contact with the bearing. However, the old grease near the bearing becomes an obstacle during intermediate lubrication, and there is a problem that the newly added grease does not reach the surface (contact surface with the bearing body) that contacts the rolling elements and cannot exert the effect. In this case, it is conceivable to provide a discharge port for discharging the old grease, but it is difficult to discharge the grease from the elongated tube due to the low fluidity of the grease, and there is a problem that the sufficient effect cannot be exhibited. there were.
As a means for solving such a problem, the movable part in the filling chamber is moved together with the deteriorated grease, whereby undegraded grease is replaced and supplied between the deteriorated grease and the bearing. A lubrication structure has been proposed in which bearings are newly lubricated with undegraded grease.

Such a lubrication structure is provided in contact with the bearing and includes a filling chamber in which undegraded grease and deteriorated grease are present with a movable portion interposed therebetween, and the movable portion in the filling chamber is a fluid of the working fluid. It has a fluid pressure cylinder part driven by pressure.
Then, when the fluid pressure cylinder part is driven, the movable part in the filling chamber moves away from the bearing, so that the deteriorated grease near the bearing is replaced with the undegraded grease located away from the bearing. (For example, refer to Patent Documents 1 and 2).

JP 2007-285517 A JP 2008-196676 A

By the way, in the fluid pressure cylinder part provided in the lubricating structure of the bearing, a piston part inserted into the cylinder part and driven by the fluid pressure of the working fluid is provided so as to extend from the movable part. The movable part is moved by pushing the extension part constituting a part.
Therefore, in the fluid pressure cylinder portion, the piston portion protrudes from the cylinder portion due to the movement stroke required for the movable portion due to the fluid pressure of the working fluid. At this time, when the length of the protruding portion of the piston portion is long, the tip portion of the piston portion is likely to swing under the influence of gravity or the like applied to the protruding portion, and the axis of the cylinder and the piston is displaced, There is a problem that wear (fretting) occurs when the inner surface of the cylinder and the outer surface of the piston portion come into contact with each other in the cylinder.

  The present invention has been made in view of the above-described circumstances, and reliably prevents the occurrence of wear due to the tip portion of the piston portion being shaken and the entrance portion of the cylinder portion and the peripheral surface of the piston portion being in contact with each other. Provided is a bearing lubrication structure capable of

In order to solve the above problems, the present invention proposes the following means.
That is, the present invention is a bearing lubrication structure in which a bearing is lubricated with a semi-solid lubricant, which is disposed on the outer side and the inner side of the machine so as to sandwich the bearing, and is filled with a semi-solid lubricant. At least two filling chambers, a movable part that is movably provided in the one filling chamber, and that flows a semi-solid lubricant in the filling chamber, and generates a driving force by the fluid pressure of the working fluid, A fluid pressure cylinder part that transmits the driving force to the movable part to drive the movable part, and the piston pushed out in a predetermined direction by the pressure of the working fluid supplied to the fluid pressure cylinder part is the piston When the cylinder is pushed out, the center of gravity of the cylinder formed by the pushed-out piston has a shape located in the cylinder part or in the vicinity of the inlet part of the cylinder part.

  According to the present invention, in a state where the piston pushed out in a predetermined direction by the pressure of the working fluid supplied to the fluid pressure cylinder part is pushed out of the cylinder, the center of gravity of the cylinder formed by the pushed piston is within the cylinder part or Since the shape is located in the vicinity of the entrance of the cylinder portion, the cylinder can stably hold the piston pushed forward. As a result, it is possible to reliably prevent wear due to the tip portion of the piston portion being shaken and hitting the inlet portion of the cylinder portion and the peripheral surface of the piston portion. A stable semi-solid lubricant can be exchanged for

It is sectional drawing of an electric motor frame provided with the lubricating structure of the bearing which concerns on embodiment of this invention, and a shaft. It is a top view of the bearing cover provided with the lubricating structure of the bearing which concerns on embodiment of this invention, (A) is the top view seen from the IIA direction of FIG. 1, (B) is seen from the IIB direction of FIG. It is a top view, (C) is the top view seen from the IIC direction of FIG. 1, (D) is the top view seen from the IID direction of FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the bearing cover provided with the lubricating structure of the bearing which concerns on 1st Embodiment of this invention, (A) is a top view, (B) and (C) cut | disconnected by the III-IIIB line | wire of (A) It is sectional drawing which shows the state which carried out. It is sectional drawing which expands and shows FIG. 3 (B) (C), (A) is sectional drawing of an initial state, (B) is sectional drawing after replacement | exchange grease. It is a fragmentary sectional view which expands and shows the V section of FIG. It is a fragmentary sectional view which expands and shows the V section of FIG. It is sectional drawing which shows the state cut | disconnected by the VI-VI line of FIG. 3 (A), (A) is sectional drawing of an initial state, (B) is sectional drawing in replacement | exchange grease, (C) These are sectional drawings after replacement lubrication. It is sectional drawing which shows the state cut | disconnected by the VII-VII line of FIG. It is a perspective view which shows typically the flow path of the working fluid of the lubrication structure which concerns on embodiment of this invention. It is sectional drawing which shows the modification (1) which concerns on embodiment of this invention, Comprising: (A) is sectional drawing when a cylinder does not have a step, (B) is sectional drawing when a cylinder has a step. is there. It is sectional drawing which shows the modification (2) which concerns on embodiment of this invention. It is sectional drawing which shows the other example of FIG. It is sectional drawing which shows the modification (3) which concerns on embodiment of this invention. It is sectional drawing which shows the modification (4) which concerns on embodiment of this invention. It is sectional drawing which shows the modification (5) which concerns on embodiment of this invention. It is sectional drawing which shows the modification (6) which concerns on embodiment of this invention, Comprising: (A) is sectional drawing of the initial state at the time of providing a buffer member in the piston side, (B) is a buffer member in the piston side. Sectional drawing after replacement lubrication when provided, (C) is a sectional view after replacement lubrication when a buffer member is provided on the cylinder side.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a cross-sectional view of an electric motor frame body and shaft having a bearing lubrication structure according to an embodiment of the present invention.
The shaft 1 is a member that transmits the power of the main motor to the wheels via a gear and an axle (not shown). The motor frame 2 is a frame (housing) that fixes and supports the stator of the main motor and rotatably supports the rotor of the main motor. The frame 3, the brackets 4 and 5, and a grease filler plug 6 and 7, collars 8 to 11, bearings 12 and 13, bearing lids (end lids) 14 to 17 and the like.

The frame 3 is a member that fixes and supports the stator of the electric motor, and the flange portions 3a and 3b are formed at both ends. The bracket 4 is a member that connects the frame 3 and the bearing lid 16, and the flange 4 A flange portion 4a joined to the portion 3a, a flow path 4b into which the operating grease _GH flows when the operating grease _GH is filled, and the like are provided. The bracket 5 is a member that connects the frame 3 and the bearing lid 17 and includes a flange portion 5a that is joined to the flange portion 3b. The greasing plugs 6 and 7 are members that are screwed into the inlets of the flow paths 4b and 17d, respectively, so as to open and close the inlets. The grease fillers 6 and 7 are formed inside these inlets. A male screw portion that meshes with the female screw portion thus formed is formed. The collars 8 to 11 are annular members that are fitted into both end portions of the shaft 1. The bearings 12 and 13 are rolling bearings that rotatably support the shaft 1, the bearing 12 is a ball bearing, and the bearing 13 is a roller bearing.
The bearings 12 and 13 include rolling elements 12a and 13a, cages 12b and 13b that hold the rolling elements 12a and 13a at equal intervals, outer rings 12c and 13c that rotate outside the cages 12b and 13b, Inner rings 12d and 13d rotating inside the cages 12b and 13b are provided. Since the bearings 12 and 13 generate heat due to the heat of stirring of the grease G when the grease G is excessively packed therein, the grease G is generally packed about 1/3 of the space volume in the initial state.

2 is a plan view of a bearing lid having a bearing lubrication structure according to an embodiment of the present invention. FIG. 2 (A) is a plan view seen from the IIA direction of FIG. 1, and FIG. 2 is a plan view seen from the IIB direction in FIG. 1, FIG. 2C is a plan view seen from the IIC direction in FIG. 1, and FIG. 2D is a plan view seen from the IID direction in FIG. . FIG. 3 is an external view of a bearing lid having a bearing lubricating structure according to an embodiment of the present invention, FIG. 3 (A) is a plan view, and FIGS. 3 (B) and 3 (C) are FIG. 3 (A). It is sectional drawing which shows the state cut | disconnected by the III-IIIB line | wire. FIG. 4 is an enlarged cross-sectional view showing an IV portion in FIGS. 3B and 3C, FIG. 4A is a cross-sectional view in an initial state, and FIG. 4B is a view after replacement lubrication. It is sectional drawing. 5 and 6 are enlarged cross-sectional views of a V portion in FIG. 4, (A) is a cross-sectional view in an initial state, and (B) is a cross-sectional view after replacement lubrication.
FIG. 7 is a cross-sectional view showing a state cut along line VI-VI in FIG. 8 is a cross-sectional view showing a state cut along the line VII-VII in FIG. FIG. 9 is a perspective view schematically showing a flow path of a working fluid having a lubricating structure.

  The bearing lids 14 and 16 shown in FIG. 1 are members that fix the bearing 12, and the bearing lids 15 and 17 are members that fix the bearing 13. The bearing lids 14 and 15 are cast or machined parts made of aluminum, iron, or the like. The bearing lids 14 and 15 are attached to the outside of the electric motor frame 2, and the bearing lids 16 and 17 are attached to the inner side of the electric motor frame 2. Has been. The bearing lid 14 is fixed to the bearing lid 16 with bolts so as to sandwich the bearing 12 between the bearing lid 16 and the bearing lid 15 is fixed to the bearing lid 17 with bolts so as to sandwich the bearing 13. The bearing lids 14 to 17 include a lubrication structure 18 having a common structure. The bearing lids 14 and 15 have substantially the same structure as shown in FIGS. 2A and 2D, and the bearing lids 16 and 17 have substantially the same structure as shown in FIGS. 2B and 2C. Structure. The bearing lid 14 includes a filling chamber 14a shown in FIGS. 1 and 3B, 3C, a pressing portion 14d shown in FIGS. 2A and 3A, through holes 14e and 14f, and FIG. 14g, the escape part 14h, etc. are provided. Hereinafter, the bearing lids 14 and 16 side will be described, and the bearing lids 15 and 17 side portions will be denoted by reference numerals corresponding to the bearing lid 14 and 16 side portions, and detailed description thereof will be omitted.

  The filling chamber 14a shown in FIGS. 3B and 3C is a portion filled with grease G for lubricating the bearing 12, and includes an annular filling chamber 14b and an outer filling chamber 14c. As shown in FIGS. 3B and 3C, the filling chamber 14 a has a quadrangular cross-sectional shape when cut in the radial direction of the bearing lid 14.

The annular filling chamber 14 b is a portion that is filled with grease G for lubricating the bearing 12. The annular filling chamber 14b is formed along a gap (bearing opening portion) between the outer ring 12c and the inner ring 12d shown in FIG. 1, and as shown in FIGS. 2 (A) and 3 (A). It is a concave groove portion formed in an annular shape so as to surround the through hole 14e in the filling chamber 14a. Annular plenum 14b, as shown in FIG. 4, is a grease filling chamber of the piston system capable replacement grease after deterioration (grease after use) Go and undegraded grease and (unused grease) G _N . As shown in FIGS. 3B and 3C, the annular filling chamber 14 b has an opening portion on the end face side of the bearing 12.
As shown in FIG. 3A, the outer filling chamber 14c is formed to extend outside the annular filling chamber 14b along the annular filling chamber 14b, and is coupled to a part of the annular filling chamber 14b. It is a U-shaped groove. As shown in FIGS. 3B and 3C, the outer filling chamber 14c has an opening on the end face side of the bearing 12 like the annular filling chamber 14b. The holding portion 14d shown in FIGS. 2A and 3A is a portion that holds the end face of the outer ring 12c, and is spaced from the outer peripheral portion of the annular filling chamber 14b along the circumferential direction of the annular filling chamber 14b. Four are formed. A through hole 14e shown in FIGS. 2A and 3A is an insertion hole for inserting the collar 8 shown in FIG. 1, and the through hole 14f is a bolt for fixing the bearing lid 14 to the bearing lid 16. An insertion hole to be inserted. 4 divides the annular filling chamber 14b and the outer filling chamber 14c, and guides the movable portion 19 in a movable manner. The escape portion 14h is a portion that prevents the wall portion 14g and the reinforcing portion 19g from interfering with each other, and two extension portions 19e are formed so as to cut out the end portion of the wall portion 14g. .
The bearing lid 15 shown in FIG. 2 (D) is also the same component as the bearing lid 14, and the filling chambers 14a to 14c, the holding portions 14d, and the filling chambers 15a to 15c similar to the through holes 14e and 14f, the pressers. A portion 15d and through holes 15e and 15f are provided.

The bearing lid 16 includes an annular filling chamber 16a shown in FIG. 2B, a pressing portion 16b, a through hole 16c, a greasing port 16d, a flow path 16f, and the like. The annular filling chamber 16 a is a portion that is filled with grease G for lubricating the bearing 12. The annular filling chamber 16a is a recess formed in an annular shape so as to surround the through hole 16c, which is formed along the gap between the outer ring 12c and the inner ring 12d. 2B is a portion that holds down the end face of the outer ring 12c of the bearing 12, and the through hole 16c is an insertion hole into which the collar 9 shown in FIG. 1 is inserted. The flow path 16f is a portion into which the working grease _GH flows when the working grease _GH is filled, and one end (upstream side) is connected to the flow path 4b of the bracket 4 and the other end. The part (downstream side) is connected to the flow path 22.

The lubricating structure 18 shown in FIG. 1 is a structure that lubricates the bearings 12 and 13 with grease G. The lubrication structure 18 lubricates the bearings 12 and 13 by supplying the grease G sealed in the annular filling chambers 14b and 15b to the bearings 12 and 13, and also in the annular filling chambers 14b and 15b as shown in FIG. interchanged grease Go after deterioration of the grease G _N of the non-deteriorated lubricating the grease G _N of the non-deteriorated. The lubrication structure 18 includes a movable portion 19 shown in FIG. 4, a discharge portion 20, a fluid pressure cylinder portion 21, a flow path 22 shown in FIGS. 8 and 9, and the like.

The fluid pressure cylinder portion 21 is pushed forward (in the direction of arrow (A)) by the pressure of the working grease _GH supplied through the flow path 22 as shown in FIGS. The total weight is set so that the center of gravity (indicated by symbol O) of the cylinder formed by the extruded piston portion 21c is located in the cylinder portion 21b or in the vicinity of the inlet portion 21b1 of the cylinder portion 21b. It is characterized by that.

  Further, as shown in FIGS. 4 to 6 (A) and (B), the piston portion 21c is pushed out from the cylinder portion 21b in the forward (arrow (A) direction) side. The center of gravity O of the cylinder formed by the portion 21c is displaced to the rear (arrow (b) direction) side.

With such a configuration of the fluid pressure cylinder portion 21, the piston portion 21 c moves forward (in the direction of the arrow (A)) by the fluid pressure of the working grease _GH supplied through the flow path 22, and the cylinder. When pushed out from the portion 21b, the center of gravity O of the cylinder formed by the pushed-out piston portion 21c is located in the cylinder portion 21b or in the vicinity of the inlet portion 21b1 of the cylinder portion 21b, and in the rear (arrow (b) direction) ) Side, the cylinder portion 21b can stably hold the extruded piston portion 21c. As a result, it is possible to reliably prevent the occurrence of wear due to the tip portion of the piston portion 21c swinging and hitting the inlet portion 21b1 of the cylinder portion 21b and the peripheral surface of the piston portion 21c. The grease G can be replaced.

The movable part 19 shown in FIGS. 4 to 7 is a part that moves in the filling chamber 14 a filled with the grease G. The movable part 19 moves in the filling chamber 14 a to separate the deteriorated grease Go on the side close to the bearing 12 from the bearing 12, and the undegraded grease _GH on the side far from the bearing 12 to the bearing 12. closer and replaces the grease G _N grease Go and undegraded after deterioration in charging chamber 14a. The movable part 19 is an annular member whose central axis is the same as the central axis of the bearing 12. In the initial state shown in FIGS. 4 (A) and 7 (A), the movable portion 19 divides the annular filling chamber 14b into two regions, a side close to the bearing 12 and a side far from the bearing 12, and FIG. 4 (B) and FIG. 7 (B) and 7 (C) are partition plates that move within the annular filling chamber 14h during replacement lubrication. As shown in FIG. 4, the movable portion 19 is fitted between the outer inner peripheral surface and the inner inner peripheral surface of the annular filling chamber 14 b, and is movably guided by these. The movable portion 19 is in the initial state shown in FIG. 4 (A) and FIG. 7 (A), an area for accommodating grease Go after deterioration, the annular packing chamber 14b in the area that houses the grease G _N of undegraded It is partitioned. The movable portion 19 is formed in an annular shape from a synthetic resin or metal material such as polyamide resin having heat resistance and oil resistance, fiber reinforced plastic, or the like, and the movable portion 19 is cut in the radial direction. It is a movable part with a groove whose cross-sectional shape is concave. As shown in FIGS. 4B, 7B, and 7C, the movable portion 19 moves in a direction away from the bearing 12, so that the movable portion 19 is not deteriorated by the surface (back surface) opposite to the bearing 12 side. The grease _GH is pressurized, and undegraded grease _GH is pushed out between the front end surface of the holding portion 19a and the end portion of the bearing 12, and is replaced and supplied. The movable part 19 includes a holding part 19a shown in FIGS. 4 and 7, a passage part 19b shown in FIG. 3, guide parts 19c and 19d shown in FIGS. 4 and 7, an extension part 19e shown in FIG. 4 to 6, the movable portion acting portion 19 f and the reinforcing portion 19 g shown in FIG. 4 are provided.

  The holding part 19a shown in FIGS. 4 and 7 is a part for holding the deteriorated grease Go. The holding portion 19a holds the deteriorated grease Go so as to be sandwiched between the inner peripheral surface of the guide portion 19c and the outer peripheral surface of the guide portion 19d. FIGS. 4 (B) and 7 (B) (C As shown in (), the grease moves after moving in a direction away from the bearing 12 while holding the deteriorated grease Go. The holding portion 19a has an opening on the bearing 12 side, and a cross-sectional shape when the movable portion 19 is cut in the radial direction is formed in a substantially U shape.

  The passage portion 19b shown in FIG. 3 is a portion connecting the outer filling chamber 14c and the annular filling chamber 14b. The passage portion 19b allows the grease G or the lubricating oil to pass through so that the grease G or the lubricating oil that has exuded from the grease G can move from the outer filling chamber 14c to the annular filling chamber 14b. As shown in FIG. 3 (A), the passage portion 19b is formed at four locations in the circumferential direction of the guide portion 20b corresponding to the outer filling chamber 14c, and as shown in FIGS. 3 (B) and (C). It is a notch part formed in the edge part of the guide part 20b.

  Guide portions 19c and 19d shown in FIG. 4 are portions that guide the movable portion 19 in a movable manner. The guide portion 19c is movably guided to the outer peripheral portion of the annular filling chamber 14b and the inner peripheral portion of the wall portion 14g, and the guide portion 19d is movably movable to the inner peripheral portion of the annular filling chamber 14b. Guided. The guide portions 19c and 19d are cylindrical guide surfaces that are centered on the central axis of the bearing lid 14 so that the movable portion 19 moves in the annular filling chamber 14b. The guide portions 19c and 19d prevent the movable portion 19 from being inclined when the movable portion 19 moves in the annular filling chamber 14b. The guide portion 19c is formed so as to be always in surface contact with the outer peripheral surface of the annular filling chamber 14b, and the guide portion 19d is contacted with the guide portion 19c so as to be always in surface contact with the inner peripheral surface of the annular filling chamber 14b. It is formed with the same length. The outer peripheral surface of the guide portion 19c is fitted to the outer peripheral surface of the annular filling chamber 14b so as to be in close contact with the outer inner peripheral surface of the annular filling chamber 14b, and the inner peripheral surface of the guide portion 19d is the annular filling chamber 14b. The annular filling chamber 14b is fitted to the outer peripheral surface so as to be in close contact with the outer inner peripheral surface.

  The extension portion 19e is a portion that extends outward from the outer peripheral portion of the movable portion 19. The thickness of the extension 19e is preferably as thin as possible within a range in which the strength of the extension 19 can be secured so that the amount of grease in the outer filling chamber 14c does not decrease. As shown in FIG. 3A, for example, two extension portions 19e are arranged at equal intervals in the circumferential direction of the filling chamber 14a (point symmetry with respect to the central axis of the movable portion 19). 14c is extended. As shown in FIG. 4, the extension portion 19e should not interfere with the wall portion 14g as much as possible. The holding portion 19a is connected to the outer peripheral portion near the bearing 12 (in the vicinity of the substantially U-shaped opening of the holding portion 19a).

  The reinforcement part 19g shown in FIG. 4 is a part which reinforces the connection part of the holding | maintenance part 19a and the extension part 19e. The reinforcing portion 19g is a rib or the like that reinforces the connection portion between the outer peripheral portion of the holding portion 19a and the base portion of the extension portion 19e, and the extension portion 19e bends when the fluid pressure cylinder portion 21 drives the extension portion 19e. Rigidity is given to the base part of the extension part 19e so that there is no. As shown in FIG. 4 (A), the reinforcing portion 19g is formed to face the end of the wall portion 14g. As shown in FIG. 4 (B), the movable portion 19 is provided at the bottom of the annular filling chamber 14b. When it moves, it contacts the escape portion 14h.

Discharge portion 20 shown in FIGS. 4 and 7, when the movable portion 19 moves in a direction away from the bearing 12, and the grease G _N of the non-deteriorated part to discharge toward the bearing 12, the movable portion 19 and the annular discharging the grease G _N of undegraded pressurized between the filling chamber 14b. Discharge unit 20, as shown in FIG. 7 (B), a flow path grease G _N of the non-deteriorated flows, grease G _N of the non-deteriorated discharges between the grease Go and the bearing 12 after deterioration. Discharge unit 20, when the movable portion 19 in a direction away from the bearing 12 has moved, the grease G _N of undegraded pressurized between the bottom surface of the rear annular chamber filled 14b of the movable portion 19 to the bearing 12 Discharge as shown by the two-dot chain line. The discharge part 20 is arrange | positioned at the inner peripheral part of the movable part 19 as shown to FIG. 3 (A), and between the inner ring | wheel 12d of the bearing 12 and the holder | retainer 12b as shown to FIG. 7 (B). grease _{G N} of the non-deteriorated discharged toward the gap _{S 11.} For example, as shown in FIG. 3A, the discharge unit 20 is arranged in an annular shape on the inner peripheral side of the movable unit 19. As shown in FIGS. 4 and 7, the discharge unit 20 includes an inlet 20a, a guide 20b, a discharge port 20c, and the like.

The fluid pressure cylinder portion 21 shown in FIGS. 4 to 6 is a portion that generates a driving force by the fluid pressure of the working grease _GH and transmits the driving force to the movable portion 19 to drive the movable portion 19. . The fluid pressure cylinder part 21 prevents the working grease _GH from leaking from the fluid pressure cylinder part 21 to the filling chamber 14a and prevents the grease G from leaking from the filling chamber 14a to the fluid pressure cylinder part 21. For this purpose, as shown in FIG. 4, a driving force is generated outside the filling chamber 14a, and this driving force is transmitted from the outside of the filling chamber 14a to the movable portion 19. The fluid pressure cylinder portion 21 includes a cylinder main body portion 21a, a cylinder chamber 21b, a piston portion 21c, a pressure receiving portion 21d, and the like shown in FIGS.

The fluid pressure cylinder portion 21 transmits a driving force to the movable portion 19 through the piston portion 21c, and drives the movable portion 19 by driving the extension portion 19e. As shown in FIG. 4, the fluid pressure cylinder portion 21 is arranged outside the filling chamber 14a and separated from the filling chamber 14a. As shown in FIG. 9, a plurality of driving forces are arranged on the movable portion 19 so that the driving force acts at a plurality of locations, and the fluid pressure cylinder portion 21 has a flow path 16 f and a flow path 22 as shown in FIGS. Are arranged so that the distances from the connecting portions to the respective fluid pressure cylinder portions 21 are equal to each other, and the movable portion 19 is driven so that the driving force acts evenly on the movable portion 19 at two locations. In the fluid pressure cylinder portion 21, a driving force is applied at equal intervals in the circumferential direction of the movable portion 19 in order to prevent the central axis of the movable portion 19 from being inclined with respect to the central axis of the bearing lid 14 during replacement lubrication. The movable part 19 is driven as described above. When the number of installed fluid pressure cylinder parts 21 is an even number, the fluid pressure cylinder part 21 is configured such that a driving force acts on the movable part 19 at a plurality of points symmetrical with respect to the central axis of the movable part 19. The movable part 19 is driven. The fluid pressure cylinder part 21 drives the movable part 19 by the fluid pressure of the same type of operating grease _GH as the grease G in the filling chamber 14a. In the fluid pressure cylinder portion 21, for example, as shown in FIG. 9, the pressure receiving portion 21d of one piston portion 21c and the pressure receiving portion 21d of the other piston portion 21c are substantially in the same position in the axial direction of the piston portion 21c. Thus, the two piston portions 21c are arranged symmetrically with respect to the central axis of the cylinder body portion 21a.

Further, a regulating member 23 for restricting movement of the piston portion 21c on the rear side (arrow (b) direction) is provided in the cylinder chamber 21b located on the rear side (arrow (b) direction) of the piston portion 21c. It has been. The restricting member 23 restricts the movement of the piston portion 21c toward the rear (arrow (B) direction) side, and forms a constant interval between the piston portion 21c and the cylinder chamber 21b, thereby operating grease. It serves to bring the fluid pressure of _{GH to} the end surface on the rear side (arrow (B) direction) of the piston portion 21c.
Further, when the piston portion 21c moves forward (in the direction of the arrow (A)) due to the fluid pressure of the working grease _GH , the piston portion 21c is pushed out from the tip portion of the cylinder chamber 21b. At this time, the length of the piston portion 21c protruding forward (indicated by reference numeral 1 in FIG. 6B) is the total length of the cylinder formed by the piston portion 21c (indicated by reference numeral L in FIG. 6A). ) Of 1) or less. As a result, the center of gravity of the cylinder formed by the extruded piston portion 21c can be positioned in the cylinder chamber 21b.

  A cylinder main body 21 a shown in FIGS. 4 to 6 is a part constituting the main body of the fluid pressure cylinder 21. The cylinder body 21a is formed in an annular shape from a synthetic resin or metal material such as polyamide resin having heat resistance and oil resistance, fiber reinforced plastic, or the like. As shown in FIG. 4, the cylinder body 21 a includes a through hole 21 f that fits with the outer ring 12 c of the bearing 12 and accommodates the bearing 12. As shown in FIG. 4, the cylinder body 21a is formed to have a thickness substantially the same as the thickness of the bearing 12. As shown in FIG. 1, both end faces of the cylinder body 21a are connected to the end face of the bearing lid 14 and the bearing. The cylinder body 21 a is sandwiched between the end surface of the lid 16 and the outer peripheral surface of the cylinder body 21 a is fitted to the inner peripheral surface of the bearing lid 16.

The cylinder chamber 21b shown in FIGS. 4-6 is a part which accommodates the piston part 21c movably. As shown in FIG. 8, the cylinder chamber 21b is arranged point-symmetrically with respect to the central axis of the cylinder main body 21a, and on the end surface of the cylinder main body 21a on the bearing 12 side as shown in FIGS. It is a recess formed at a predetermined depth. The cylinder chamber 21b forms a fluid pressure working chamber into which the working grease _GH flows into the space (head side chamber) between the piston portion 21c and the pressure receiving portion 21d.

The piston portion 21c is a member that moves in the cylinder chamber 21b under the fluid pressure of the working grease _GH . The piston portion 21c is formed with a predetermined length so as to always come into surface contact with the inner peripheral surface of the cylinder chamber 21b within the movable range of the piston portion 21c when moving in the cylinder chamber 21b. The outer peripheral surface of the piston portion 21c is slidably in close contact with the inner surface of the cylinder chamber 21b to prevent the operating grease _GH from leaking from the cylinder chamber 21b to the filling chamber 14a and from the filling chamber 14a to the cylinder. The grease G is prevented from leaking into the chamber 21b. The piston portion 21c has an outer diameter of a portion corresponding to a piston rod of a normal cylinder mechanism such that the space between the outer peripheral surface of the piston portion 21c and the inner peripheral surface of the cylinder chamber 21b is sealed over a wide range. It is formed integrally with the piston rod so as to have the same outer diameter.

The pressure receiving portion 21d is a portion that receives the fluid pressure of the working grease _GH . The pressure receiving portion 21d is formed at the rear end portion (bottom portion) of the piston portion 21c so that the piston portion 21c moves forward when the fluid pressure of the working grease _GH acts.

Reference numeral 21e in FIG. 5 denotes a tip portion of the piston portion 21c. When the fluid pressure of the working grease _GH acts on the pressure receiving portion 21d, the extension portion 19e is pressed to move the movable portion 19.

The flow path 22 shown in FIGS. 8 and 9 is a portion for supplying the operating grease _GH to the fluid pressure cylinder portion 21 from the outside. As shown in FIG. 8, the flow path 22 is formed on the outer peripheral surface of the cylinder body 21 a along the circumferential direction, and an open groove is closed by the inner peripheral surface of the bearing lid 16. And a linear through hole formed from the downstream side of the groove to the cylinder chamber 21b.
As shown in FIGS. 1 and 9, one end (upstream side) of the flow path 22 is connected to the flow path 16 f of the bearing lid 16, and the other end (downstream side) as shown in FIGS. 8 and 9. Side) is connected to the fluid pressure cylinder portion 21, and is open to the cylinder chamber 21 b of the fluid pressure cylinder portion 21. The flow path 22 is connected to the two fluid pressure cylinders from the connection portion between the flow path 16f and the flow path 22 so that the fluid pressure of the working grease _GH acts equally on the pressure receiving portions 21d of the two fluid pressure cylinder sections 21. The distance between the pressure portion 21d of the portion 21 is equal and the flow rates of the working grease _GH flowing into the two fluid pressure cylinder portions 21 are equal.
In the configuration described above, the supply mechanism 40 is configured by the greasing plugs 6, 7, the channel 4 b, the channel 16 f, the channel 17 d, and the channel 22.

Next, the operation of the bearing lubrication structure according to the embodiment of the present invention will be described.
As shown in FIG. 2A, in an initial state, the annular filling chamber 14b is filled with grease G without any gap. Further, as shown in FIGS. 4A and 7A, grease G is filled between the movable portion 19 and the bearing 12, between the annular filling chamber 14b and the movable portion 19, and also in the outer filling chamber 14c. Has been. When air is sealed in the fluid pressure cylinder portion 21 shown in FIGS. 4 to 6 and the flow paths 4b, 16f, 17d, and 22 shown in FIG. 1, the working grease _GH is replaced at the time of replacement lubrication (maintenance). Movement may be hindered. Therefore, as shown in FIGS. 4 (A) and 7 (A), in the initial state, the hydraulic cylinder portion 21 is filled with the working grease _GH without any gaps. The operating grease _GH is also filled in the flow paths 4b, 16f, 17d, and 22 up to the tips of the grease plugs 6 and 7 shown in FIG. When the bearing 12 rotates in this state, the grease G in the vicinity of the end face of the bearing 12 gradually deteriorates, and wear grease is applied to the grease G in the vicinity of the end face of the bearing 12 as shown in FIGS. 4 (A) and 7 (A). And so on.
As shown in FIGS. 4 (B) and 7 (B), at the time of replacement lubrication, the greasing plug 6 shown in FIG. 1 is removed from the inlet so that the movable part 19 moves in a direction away from the bearing 12. The working grease _GH is injected into the path 4b. As a result, the working grease _GH passes through the flow paths 4b, 16f, and 22, and the working grease _GH flows into the fluid pressure cylinder portion 21 as shown in FIGS.

When the operating grease _GH flows into the fluid pressure cylinder portion 21, the internal pressure in the cylinder chamber 21b increases as the amount of the operating grease _GH injected increases, and the fluid pressure applied to the pressure receiving portion 21d of the piston portion 21c also increases. To do. For this reason, when the piston portion 21c starts moving forward (in the direction of arrow (A)) in the cylinder chamber 21b, the piston portion 21c presses the extension portion 19e to transmit the driving force and away from the bearing 12. The movable part 19 starts moving.
Here, the pressure of the actuating grease G _H, the piston portion 21c is moved forward (arrow (a) direction) side, in a state extruded from the inlet portion 21b1 of the cylinder portion 21b, the extruded piston unit Since the center of gravity O of the cylinder formed by 21c is located in the cylinder portion 21b or in the vicinity of the inlet portion 21b1 of the cylinder portion 21b and on the rear side (arrow (b) direction), the piston portion 21c pushed forward is The cylinder part 21b can be stably held.

As described above, when the piston portion 21c moves forward (in the direction of the arrow (A)), the deteriorated grease Go moves together with the movable portion 19 while being held by the holding portion 19a. The deteriorated grease _GN is pressed between the bottom and the bottom of the annular filling chamber 14b. Therefore, FIG. 7, as shown by a two-dot chain line (B), while the grease G _N of the non-deteriorated is guided by the guide portion 20b from the inlet 20a ejecting from the outlet 20c, the distal end surface of the holding portion 19a and the bearing 12 The undegraded grease _GN is gradually filled between the front surface and the front surface. As shown in FIGS. 4B and 7C, when the movable portion 19 moves until it comes into contact with the bottom of the annular filling chamber 14b, the undegraded grease G is placed between the deteriorated grease Go and the bearing 12. _N is fully replacement greasing, the bearing 12 is newly lubricated by grease G _N of the non-deteriorated. Replacement grease is also supplied to the annular filling chamber 15b on the bearing lid 15 side by the same method.

As described in detail above, in the bearing lubrication structure according to this embodiment. In a state where the piston portion 21c pushed forward (arrow (B) direction) side by the pressure of the working grease _GH supplied through the flow path 22 is pushed out from the cylinder portion 21b, the pushed-out piston portion 21c is Since the center of gravity O of the cylinder formed is located in the cylinder portion 21b or in the vicinity of the inlet portion 21b1 of the cylinder portion 21b and on the rear side (arrow (B) direction), the piston portion 21c pushed forward is moved to the cylinder portion. 21b can be stably held. As a result, it is possible to reliably prevent the occurrence of wear due to the tip portion of the piston portion 21c swinging and hitting the inlet portion 21b1 of the cylinder portion 21b and the peripheral surface of the piston portion 21c. There is an effect that the grease G can be replaced.

The above embodiment may be modified as follows.
(Modification 1)
In the above embodiment, the diameter of the piston portion 21c is uniform. However, as shown in FIG. 10, the piston portion 21c of the fluid pressure cylinder portion 21 is on the front (arrow (A) direction) side and the inner diameter of the cylinder portion 21b. And a small-diameter portion 21c2 having a small outer diameter on the rear side (arrow (b) direction) side, and the large-diameter portion 21c1 and the small-diameter portion 21c2 are integrated. But you can.
That is, in the fluid pressure cylinder portion 21, as shown in FIG. 10, in the state where the fluid pressure cylinder portion 21 is drawn into the cylinder portion 21b, the opening of the flow path 22 for supplying the operating grease _GH to the cylinder portion 21b. The base end of the large-diameter portion 21c1 of the piston portion 21c is disposed at a position ahead of the portion 22a by a predetermined length (in the direction of the arrow (A)).
Furthermore, as shown in FIG. 10 (B), by reducing the inner diameter of the cylinder portion 21b corresponding to the small diameter portion 21c2 of the piston and contacting the base end of the large diameter portion 21c1 of the piston portion 21c, It is good also as a structure which can determine an initial position.

(Modification 2)
In the above embodiment, the piston portion 21c of the fluid pressure cylinder portion 21 is configured by integrally connecting the large diameter portion 21c1 and the small diameter portion 21c2, but at this time, as shown in FIG. 11 and FIG. The entire piston portion 21c of the fluid pressure cylinder portion 21 is formed in a columnar shape having the same diameter, and a hollow portion 51 that forms a space portion is formed on the end surface of the piston portion 21c on the front side (arrow (A) direction). You may do it.
Such a hollow portion 51 has a role of displacing the center of gravity O of the piston portion 21c rearward (in the direction of the arrow (b)), and the piston is driven by the pressure of the working grease _GH supplied through the flow path 22. When the portion 21c is pushed forward (in the direction of the arrow (A)), the tip of the piston portion 21c is shaken and wear due to the entrance portion 21b1 of the cylinder portion 21b and the peripheral surface of the piston portion 21c is prevented. can do.

  Moreover, in the hollow part 51 shown in FIG. 12, the inner diameter of the hollow part 51 is made into two steps through the step part 51A in the middle, and a plurality of types of diameters are provided through the step part 51A. Thus, the position adjustment of the center of gravity O of the piston portion 21c can be performed in multiple stages.

(Modification 3)
In the above-described embodiment, the large-diameter portion 21c1 is disposed on the front (arrow (A) direction) side of the piston portion 21c of the fluid pressure cylinder portion 21 in which the large-diameter portion 21c1 and the small-diameter portion 21c2 are integrally connected. The small diameter portion 21c2 is arranged on the rear side (arrow (b) direction), but the center of gravity of the piston portion 21c pushed out from the cylinder portion 21b is located in the cylinder portion 21b or in the vicinity of the inlet portion 21b1 of the cylinder portion 21b. If it is located, it is not limited to the above-mentioned example, and as shown in FIG. 13, the small diameter portion 21c2 is arranged on the front (arrow (B) direction) side, and the large diameter portion 21c1 is arranged on the rear (arrow (B) direction). ) May be arranged on the side.
And by such a structure, by adjusting the length along the axis line of these large diameter part 21c1 and small diameter part 21c2, the gravity center O of the piston part 21 is made into the cylinder part 21b or the entrance of the cylinder part 21b. It can be moved in the vicinity of the portion 21b1 and further to the rear (arrow (b) direction) side, the tip portion of the piston portion 21c is shaken, and the inlet portion 21b1 of the cylinder portion 21b and the peripheral surface of the piston portion 21c come into contact with each other Wear due to can be prevented.

(Modification 4)
Moreover, in the said embodiment, the piston part 21c of the fluid-pressure cylinder part 21 is not formed with a single member, but by combining a plurality of members, the center of gravity O of the piston part 21c is moved backward (arrow (b) direction). Adjustment for displacement toward the) side may be performed. For example, as shown in FIG. 14, the front side (arrow (A) direction) of the piston portion 21c is a low-density material (indicated by reference numeral 21c3), and the rear side (arrow (B) direction) is higher density material than the front part. You may use the piston part 21c comprised by (it shows with the code | symbol 21c4).

(Modification 5)
Further, in the above embodiment, as shown in FIG. 15, the length of the main body portion of the piston portion 21c is shortened and in front of it, the movable portion 19 is contacted and pressed, and the movable portion 19 is moved forward (arrow (I The intermediate member 52 for moving to the (direction) side may be provided integrally with the piston 21c.
In addition, although the intermediate member 52 of FIG. 15 is formed in T shape in order to press the extension part 19e of the movable part 19, this shape is not limited. Further, the intermediate member 52 for moving to the front (arrow (b) direction) side is formed of a member that is lighter than the constituent material of the piston part 21c on the rear (arrow (b) direction) side, for example, plastic or light metal. Thus, the center of gravity O of the piston portion 21c may be displaced further rearward (in the direction of the arrow (b)) to effectively prevent the tip portion of the piston portion 21c from swinging.
In addition, the intermediate member 52 may be connected to the main body of the piston portion 21c by screwing, and the length and weight may be appropriately changed in order to adjust the position of the center of gravity. Further, the portion where the intermediate member 52 contacts the extension 19e of the movable portion 19 may be chamfered (indicated by reference numeral 52 ′ in FIG. 15) so that the members are not damaged.

(Modification 6)
Moreover, in the said embodiment, when the piston part 21c is extruded from the cylinder part 21b, the front-end | tip part of this piston part 21c shakes, and the peripheral surface of the piston part 21c and the entrance part 21b1 of the cylinder part 21b contact | win. The configuration for preventing the malfunction has been described. Here, in preparation for the occurrence of such malfunction, the piston portion 21c is moved forward (in the direction of the arrow (A)) as shown in FIGS. 16 (A) and 16 (B). In the pushed state, one or more O-rings 53 serving as buffer members are provided on the outer peripheral portion of the piston portion 21c in contact with the cylinder portion 21b, and the O-ring 53 causes the vibration of the tip portion of the piston portion 21c and You may make it ease a collision.
Further, as shown in FIG. 16C, one or a plurality of O-rings 53 serving as shock absorbing members are provided in the vicinity of the inlet portion 21b1 of the inner peripheral portion of the cylinder portion 21b, and the piston portion 21c is formed by the O-ring 53. You may make it ease the fluctuation | variation and collision of the front-end | tip part.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included. Moreover, about the said embodiment and its modifications 1-6, by setting the whole weight so that the gravity center O of the piston part 21c may be located in the cylinder part 21b or the entrance part 21b1 vicinity of this cylinder part 21b, As long as it is possible to effectively prevent the tip portion of the piston portion 21c from swinging, the respective examples may be appropriately combined.

  The present invention relates to a lubricating structure of a bearing that is applied to a railway vehicle or the like and lubricates the bearing with grease (semi-solid lubricant).

DESCRIPTION OF SYMBOLS 12 Bearing 13 Bearing 14a Filling chamber 15a Filling chamber 16a Filling chamber 17a Filling chamber 19 Movable part (action part)
21 Fluid pressure cylinder part 21b Cylinder part 21b1 Inlet part 21c Piston part 21c1 Large diameter part 21c2 Small diameter part 51 Hollow part (space part)
52 Intermediate member 53 O-ring (buffer member)
G (Go · _GN ) Grease (semi-solid lubricant)
Grease for _GH operation (working fluid)
O Center of gravity (b) Front (b) Back

Claims (9)

A lubricating structure of a bearing that lubricates a bearing provided in a power transmission system that transmits power of an electric motor to a wheel with a semi-solid lubricant ,
At least two filling chambers arranged on the outside and inside of the machine so as to sandwich the bearing, and filled with a semi-solid lubricant in the interior;
A movable part that is movably provided in the one filling chamber to flow the semi-solid lubricant in the filling chamber;
A fluid pressure cylinder unit that generates a driving force by the fluid pressure of the working fluid, transmits the driving force to the movable unit, and drives the movable unit;
The piston pushed out in a predetermined direction by receiving the pressure of the working fluid supplied to the fluid pressure cylinder part at the pressure receiving end is such that the center of gravity of the cylinder formed by the pushed-out piston is the cylinder in the pushed state. In or near the inlet of the cylinder ,
The end of the piston opposite to the pressure receiving end is provided at a position radially outward from the bearing, and drives an extension extending radially outward from the movable part,
In the state where the piston is pushed out, the center of gravity of the cylinder formed by the pushed-out piston has a shape displaced rearward in the predetermined direction,
A lubrication structure for a bearing, wherein a space is provided at a position on the front side in the predetermined direction of a cylinder formed by the piston.   2. The bearing lubrication structure according to claim 1, wherein the space is provided in a plurality of stages with different inner diameters in the piston. The piston has an outer diameter corresponding to the inner diameter of the fluid pressure cylinder at a position ahead of a predetermined direction from an opening for supplying the working fluid to the fluid pressure cylinder in a state where the piston is drawn into the fluid pressure cylinder. 3. The bearing lubrication structure according to claim 1, wherein a base end of the piston large diameter portion is disposed, and a small diameter portion having an outer diameter smaller than the large diameter portion is further provided. A lubricating structure of a bearing that lubricates a bearing provided in a power transmission system that transmits power of an electric motor to a wheel with a semi-solid lubricant,
At least two filling chambers arranged on the outside and inside of the machine so as to sandwich the bearing, and filled with a semi-solid lubricant in the interior;
A movable part that is movably provided in the one filling chamber to flow the semi-solid lubricant in the filling chamber;
A fluid pressure cylinder unit that generates a driving force by the fluid pressure of the working fluid, transmits the driving force to the movable unit, and drives the movable unit;
The piston pushed out in a predetermined direction by receiving the pressure of the working fluid supplied to the fluid pressure cylinder part at the pressure receiving end is such that the center of gravity of the cylinder formed by the pushed-out piston is the cylinder in the pushed state. In or near the inlet of the cylinder,
The end of the piston opposite to the pressure receiving end is provided at a position radially outward from the bearing, and drives an extension extending radially outward from the movable part,
In the state where the piston is pushed out, the center of gravity of the cylinder formed by the pushed-out piston has a shape displaced rearward in the predetermined direction,
In the state where the piston is pushed out, the length of the pushed-out piston projecting forward from the tip of the cylinder in a predetermined direction is one half or less of the total length of the cylinder formed by the piston. Lubricating structure for bearings. A lubricating structure of a bearing that lubricates a bearing provided in a power transmission system that transmits power of an electric motor to a wheel with a semi-solid lubricant,
At least two filling chambers arranged on the outside and inside of the machine so as to sandwich the bearing, and filled with a semi-solid lubricant in the interior;
A movable part that is movably provided in the one filling chamber to flow the semi-solid lubricant in the filling chamber;
A fluid pressure cylinder unit that generates a driving force by the fluid pressure of the working fluid, transmits the driving force to the movable unit, and drives the movable unit;
The piston pushed out in a predetermined direction by receiving the pressure of the working fluid supplied to the fluid pressure cylinder part at the pressure receiving end is such that the center of gravity of the cylinder formed by the pushed-out piston is the cylinder in the pushed state. In or near the inlet of the cylinder,
The end of the piston opposite to the pressure receiving end is provided at a position radially outward from the bearing, and drives an extension extending radially outward from the movable part,
In the state where the piston is pushed out, the center of gravity of the cylinder formed by the pushed-out piston has a shape displaced rearward in the predetermined direction,
The piston has an outer diameter corresponding to the inner diameter of the fluid pressure cylinder at a position ahead of a predetermined direction from an opening for supplying the working fluid to the fluid pressure cylinder in a state where the piston is drawn into the fluid pressure cylinder. A lubricating structure for a bearing, characterized in that a base end of a piston large-diameter portion is disposed and a small-diameter portion having an outer diameter smaller than that of the large-diameter portion is provided. A lubricating structure of a bearing that lubricates a bearing provided in a power transmission system that transmits power of an electric motor to a wheel with a semi-solid lubricant,
At least two filling chambers arranged on the outside and inside of the machine so as to sandwich the bearing, and filled with a semi-solid lubricant in the interior;
A movable part that is movably provided in the one filling chamber to flow the semi-solid lubricant in the filling chamber;
A fluid pressure cylinder unit that generates a driving force by the fluid pressure of the working fluid, transmits the driving force to the movable unit, and drives the movable unit;
The piston pushed out in a predetermined direction by receiving the pressure of the working fluid supplied to the fluid pressure cylinder part at the pressure receiving end is such that the center of gravity of the cylinder formed by the pushed-out piston is the cylinder in the pushed state. In or near the inlet of the cylinder,
The end of the piston opposite to the pressure receiving end is provided at a position radially outward from the bearing, and drives an extension extending radially outward from the movable part,
In the state where the piston is pushed out, the center of gravity of the cylinder formed by the pushed-out piston has a shape displaced rearward in the predetermined direction,
The piston has a piston large-diameter portion corresponding to the inner diameter of the fluid pressure cylinder disposed on the base end side, and a small-diameter portion having a smaller outer diameter than the large-diameter portion on the distal end side. Lubricating structure for bearings. A lubricating structure of a bearing that lubricates a bearing provided in a power transmission system that transmits power of an electric motor to a wheel with a semi-solid lubricant,
At least two filling chambers arranged on the outside and inside of the machine so as to sandwich the bearing, and filled with a semi-solid lubricant in the interior;
A movable part that is movably provided in the one filling chamber to flow the semi-solid lubricant in the filling chamber;
A fluid pressure cylinder unit that generates a driving force by the fluid pressure of the working fluid, transmits the driving force to the movable unit, and drives the movable unit;
The piston pushed out in a predetermined direction by receiving the pressure of the working fluid supplied to the fluid pressure cylinder part at the pressure receiving end is such that the center of gravity of the cylinder formed by the pushed-out piston is the cylinder in the pushed state. In or near the inlet of the cylinder,
The end of the piston opposite to the pressure receiving end is provided at a position radially outward from the bearing, and drives an extension extending radially outward from the movable part,
In the state where the piston is pushed out, the center of gravity of the cylinder formed by the pushed-out piston has a shape displaced rearward in the predetermined direction,
2. The bearing lubrication structure according to claim 1, wherein the piston has a portion made of a high-density material on the proximal end side and a portion made of a low-density material on the distal end side. A lubricating structure of a bearing that lubricates a bearing provided in a power transmission system that transmits power of an electric motor to a wheel with a semi-solid lubricant,
At least two filling chambers arranged on the outside and inside of the machine so as to sandwich the bearing, and filled with a semi-solid lubricant in the interior;
A movable part that is movably provided in the one filling chamber to flow the semi-solid lubricant in the filling chamber;
A fluid pressure cylinder unit that generates a driving force by the fluid pressure of the working fluid, transmits the driving force to the movable unit, and drives the movable unit;
The piston pushed out in a predetermined direction by receiving the pressure of the working fluid supplied to the fluid pressure cylinder part at the pressure receiving end is such that the center of gravity of the cylinder formed by the pushed-out piston is the cylinder in the pushed state. In or near the inlet of the cylinder,
The end of the piston opposite to the pressure receiving end is provided at a position radially outward from the bearing, and drives an extension extending radially outward from the movable part,
In the state where the piston is pushed out, the center of gravity of the cylinder formed by the pushed-out piston has a shape displaced rearward in the predetermined direction,
A lubricating structure for a bearing, wherein an intermediate member for transmitting the pushing force of the piston to the acting portion is provided between the piston and the acting portion that receives the pushing force of the piston. Lubricating structure for bearing according to any one of claims 1-8, characterized in that a buffer member between the piston and the fluid pressure cylinder.

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