JP5220789B2 - 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 the grease inside the bearing, a grease reservoir is provided in the vicinity of the bearing, and this grease reservoir 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 bearing of the main motor is often used at high rotation and high temperature, the deterioration of grease (lubricant) is promoted, and the lubrication life is reached relatively early due to wear of the bearing. For this reason, some main motors are initially filled with grease leaving a certain space in the grease reservoir, and after a certain amount of time has elapsed (for example, when driving for 600,000 km), this space is filled with grease. A method called intermediate greasing is additionally implemented.

  The conventional lubrication structure of the bearing is a movable structure that moves in the filling chamber in a direction away from the bearing in order to form a space for filling undegraded grease between the deteriorated grease in the filling chamber and the bearing. (For example, refer to Patent Documents 1 and 2).

  In the conventional bearing lubrication structure, for example, the movable body is moved by contracting the bag body by fluid pressure in the filling chamber, or the movable portion is moved by manually or automatically rotating the feed screw mechanism. A structure in which the movable part is moved by the biasing force of the spring after releasing the stopper, a structure in which the movable part is moved by pulling a string, or the like is used.

JP 2007-285517 A JP 2008-196676 A

  Incidentally, in the bearing lubrication structure as described above, it is necessary to provide a feed screw mechanism portion for moving the movable portion outside the bearing lid. However, with the conventional bearing lubrication structure, when it is difficult to secure sufficient working space or installation space outside the bearing lid, intermediate lubrication is easily performed with the main motor bearing remaining in a non-disassembled state. There was a problem that could not be done. For example, in a conventional bearing lubrication structure, there is only a slight gap outside the bearing lid with the main motor mounted on the carriage, and even if the operation portion of the feed screw mechanism is rotated by a tool, the outside of the bearing lid It was impossible to insert a tool into the gap.

  Further, in the conventional bearing lubrication structure, for example, when the movable part is driven by the feed screw mechanism part, the operation part is passed through the through hole of the bearing lid, and a seal material or the like is provided between the through hole and the operation part. To prevent the grease from leaking between them. However, in such a conventional bearing lubrication structure, there is a problem that if the forgetting to seal with the sealing material before and after the intermediate lubrication work, the grease leaks out from the bearing lid and causes a problem in lubrication. .

In order to solve such a space problem and a grease leakage problem, a lubrication structure (for example, Japanese Patent Application No. 2009) provided with a fluid pressure working chamber that applies a fluid pressure of the working fluid to the pressure receiving portion of the movable portion. -75397), a fluid pressure cylinder having a piston connected to the movable part, and a lubrication provided with a working fluid injection channel for injecting a working fluid from the outside to the fluid pressure cylinder A structure (for example, Japanese Patent Application No. 2009-75398) has been proposed by the same applicant.
By the way, in such a grease supply mechanism for injecting a working fluid from the outside, the movable part in the filling chamber is moved by feeding the grease into the filling chamber on the outside of the machine located outside the bearing or the fluid pressure cylinder having the piston part. Thus, the undegraded grease is completely replaced between the deteriorated grease and the bearing, and the bearing is newly lubricated by the undegraded grease.

  However, such a grease supply mechanism feeds grease into the filling chamber outside the machine located outside the bearing or into the fluid pressure cylinder, for example, into the filling chamber inside the machine located inside the bearing. When supplying grease, it is necessary to provide two sets of the same grease supply mechanism (for example, FIG. 10 of Japanese Patent Application No. 2009-75398) or to provide two greasing ports for the working fluid injection channel and separately lubricate the grease. There was a problem that the whole structure and its greasing work became complicated.

  The present invention has been made in view of the circumstances described above, and has a simple structure in which grease can be fed into two filling chambers located on the inside and outside of the bearing by one grease supply mechanism. The lubrication structure is provided.

In order to solve the above problems, the present invention proposes the following means.
That is, the present invention is a bearing lubrication structure that lubricates a bearing with grease, and is arranged 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 in the inside. A driving force is generated by a filling chamber, a movable portion that is movably provided in the one filling chamber, and allows the semi-solid lubricant in the filling chamber to flow, and the fluid pressure of the working fluid made of the semi-solid lubricant. A fluid pressure cylinder portion that transmits the driving force to the movable portion to drive the movable portion, and the working fluid that drives the fluid pressure cylinder portion is filled with the other through the connection channel. It is characterized by being guided indoors.

  According to the present invention, since the working fluid made of a semi-solid lubricant and driving the fluid pressure cylinder part is guided into the filling chamber inside the machine (the other side) through the connection flow path, the fluid pressure cylinder part A semi-solid lubricant is fed into a filling chamber located on the inner side of the bearing and a filling chamber (having movable parts) located on the outer side (one side) of the bearing through a supply mechanism for supplying a working fluid to Thus, the entire structure can be simplified, for example, it is not necessary to provide another set of movable parts in the filling chamber located inside the machine.

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 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 sectional drawing which shows the path | route of the connection flow path from a movable part to the filling chamber inside a machine. 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 of embodiment of this invention, (A) is sectional drawing of an initial state, (B) is sectional drawing after replacement | exchange lubrication. It is sectional drawing which shows the modification 2 of embodiment of this invention, (A) is the top view seen from the IIA direction of FIG. 1, (B) is the top view seen from the IID direction of FIG. It is sectional drawing which shows the modification 3 of embodiment of this invention, (A)-(C) is sectional drawing which shows replacement | exchange of the grease accompanying the movement of a movable part, (D) is an arrow ( D) It is the figure seen from the direction.

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 is an enlarged cross-sectional view of a V portion in FIG. 4, FIG. 5 (A) is a cross-sectional view in an initial state, and FIG. 5 (B) is a cross-sectional view after replacement lubrication. FIG. 6 is a cross-sectional view showing a state cut along line VI-VI in FIG. 7 is a cross-sectional view showing a state cut along the line VII-VII in FIG. FIG. 8 is a cross-sectional view showing the path of the connecting flow path from the movable part to the filling chamber inside the machine, and FIG. 9 is a perspective view schematically showing the flow path of the working fluid of the 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 open portion 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. 7 to 9, and the like.
Further, as shown in FIG. 4, the fluid pressure cylinder portion 21 is provided with the operation grease G via the cylinder chamber 21 b of the fluid pressure cylinder portion 21 together with the flow path 22 to which the operation grease _GH is supplied. A connecting flow path 30 for guiding _H into the annular filling chamber 16a in the bearing lid 16 is provided.
This connection flow path 30 is provided in each of the two sets of fluid pressure cylinder portions 21 (see FIGS. 1 and 7 to 9), and as shown in FIGS. When the piston portion 21c in the pressure cylinder portion 21 is in the initial state, the opening 30A is in a closed state, and, as shown in FIGS. 4 (A) and 5 (B), through the flow path 22. When the operating grease _GH is injected, the opening 30A is opened when the piston portion 21c moves by a predetermined amount, and the operating grease _GH that passes through the cylinder chamber 21b through the connection flow path 30 is An annular filling chamber 16a in the bearing lid 16 (annular filling chamber 17a on the right side in FIG. 1) is guided (described later).

The movable portion 19 shown in FIGS. 4 to 6 is a portion 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 6 (A), the movable portion 19 divides the annular filling chamber 14b into two regions, a side closer to the bearing 12 and a side far from the bearing 12, and FIG. 4 (B) and FIG. 6 (B) and 6 (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 FIGS. 4 (A) and FIG. 6 (A), the a region 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. 4 (B), 6 (B), and 6 (C), the movable portion 19 is not deteriorated by the surface (back surface) opposite to the bearing 12 side by moving away from the bearing 12. 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 6, a passage part 19b shown in FIG. 3, guide parts 19c and 19d shown in FIGS. 4 and 6, an extension part 19e shown in FIG. 4 and FIG. 5 includes a movable portion side fitting portion 19f and a reinforcing portion 19g shown in FIG.

  The holding part 19a shown in FIGS. 4 and 6 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 6 (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 (near the substantially U-shaped opening of the holding portion 19a).

The movable portion side fitting portion 19 f shown in FIG. 5 is a portion that fits with the cylinder side fitting portion 21 e of the fluid pressure cylinder portion 21. The movable portion side fitting portion 19f is a recess (through hole) formed in the extension portion 19e, and as shown in FIG. 5, the inner peripheral portion of the movable portion side fitting portion 19f and the outer periphery of the cylinder side fitting portion 21e. as predetermined gap △ ₁₁ between the parts is formed, the inner diameter of the movable portion engaging portions 19f is formed larger than the outer diameter of the cylinder-side engaging portion 21e.

  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.

Figure 4 and the discharge unit 20 shown in FIG. 6, 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. 6 (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. As shown in FIG. 3 (A), the discharge portion 20 is disposed on the inner peripheral portion of the movable portion 19 with an interval in the circumferential direction of the movable portion 19, and a bearing as shown in FIG. 6 (B). discharging the grease _{G N} of the non-deteriorated toward the gap _{S 11} between the retainer 12b and the inner ring 12d 12. For example, as shown in FIG. 3A, eight discharge units 20 are arranged at equal intervals in the circumferential direction of the movable unit 19 so as to be equidistant from the central axis of the bearing lid 14. As shown in FIGS. 4 and 6, the discharge unit 20 includes an inlet 20a, a guide 20b, a discharge port 20c, and the like.

Inlet 20a is a portion which the grease G _N of the non-deteriorated flows, as the cross-sectional shape in the circumferential direction of the edge portion of the movable portion 19 (hole shape) is substantially rectangular, cutting out the movable portion 19 Is formed. As shown in FIG. 6B, when the movable part 19 moves in the direction away from the bearing 12 as shown in FIG. 6 (B), the inflow rod 20a is undeteriorated under pressure between the movable part 19 and the annular filling chamber 14b. grease _{G N} flows.

Guide portion 20b shown in FIGS. 4 and 6, the grease G _N of the non-deteriorated a portion for guiding the grease G _N of the non-deteriorated to move toward the bearing, towards the bearing 12 toward the bearing 12 It is a wall that stands up. As shown in FIGS. 4A and 6A, the guide portion 20b is formed at such a height that the position of the discharge port 20c and the end surface of the bearing 12 substantially coincide with each other in the initial state. ing. Guide portion 20b, as shown in FIG. 3 (A), the cross-sectional shape (hole shape) is long radially in the circumferential direction of the movable portion 19 when cut by a plane perpendicular to the direction of movement of the grease G _N of undegraded The guide portion 20b is formed in the same size from the inflow port 20a toward the discharge port 20c. As shown in FIGS. 4 and 6, the guide portion 20 b is formed perpendicular (straight) to the surface of the movable portion 19 on the bearing 12 side, and is cut in the radial direction and the circumferential direction of the movable portion 19. The cross section at the time is linear.

Outlet 20c is a portion for discharging the grease G _N of the non-deteriorated at a position opposite to the bearing 12, forms a slight gap between the retainer 12b of the bearing 12 as shown in FIGS. 4 and 6 As shown, the cage 12b faces the cage 12b. As shown in FIG. 3A, the discharge port 20c is formed in a substantially rectangular shape like the inflow port 20a.

The fluid pressure cylinder portion 21 shown in FIGS. 4 and 5 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 body portion 21a, a cylinder chamber 21b, a piston portion 21c, a pressure receiving portion 21d, a cylinder side fitting portion 21e shown in FIG. .

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. 7 to 9. 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.

  The cylinder body 21a shown in FIGS. 4 and 5 is a part constituting the 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 FIG.4 and FIG.5 is a part which accommodates the piston part 21c so that a movement is possible. As shown in FIG. 7, 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. The pressure receiving portion 21d is a planar pressure receiving surface formed perpendicular to the central axis of the bearing 12 (the central axis of the shaft 1).
As shown in FIGS. 4 and 5, the cylinder chamber 21 b of the fluid pressure cylinder portion 21 has a flow path 22 to which the working grease _GH is supplied, and a cylinder chamber 21 b of the fluid pressure cylinder portion 21. A connection flow path 30 is provided for guiding the working grease _GH that passes through to the annular filling chamber 16a in the bearing lid 16.
This connection flow path 30 is provided at the same position of each of the two sets of fluid pressure cylinder portions 21 (see FIGS. 1 and 7 to 9), and as shown in FIGS. 4 (A) and 5 (A). When the piston part 21c in the fluid pressure cylinder part 21 is in the initial state, the opening 30A is in a closed state, and as shown in FIGS. 4B and 5B, the flow path The operation grease _GH is injected through the opening 22 so that the opening 30A is opened when the piston portion 21c moves to the left in the figure by a predetermined amount, and the operation through the cylinder chamber 21b is performed through the connection flow path 30. The grease _GH is guided into the annular filling chamber 16a in the bearing lid 16 (described later).
In addition, the predetermined amount said here is a movable part which contacts the bearing 12 as shown in FIGS. 6 (A) to 6 (C) when the piston part 21c of the fluid pressure cylinder part 21 in the initial state moves. This shows the amount of movement required until the bottom surface of 19 hits the bottom surface of the annular filling chamber 14b.
Similarly, the connection flow path 30 described above is also provided between the cylinder chamber 21b of the fluid pressure cylinder 21 on the other side (right side in FIG. 1) and the annular filling chamber 17a in the bearing lid 17. However, the configuration is the same as that of the previous connection flow path 30, and the description thereof is omitted.

The cylinder side fitting portion 21e shown in FIG. 5 is a portion that fits with the movable portion side fitting portion 19f of the extension portion 19e. The cylinder side fitting part 21e is a convex part (projection part) formed at the tip part of the piston part 21c. When the fluid pressure of the working grease _GH acts on the pressure receiving part 21d, the extension part 19e is pressed. The movable part 19 is moved.

The flow path 22 shown in FIGS. 7 to 9 is a portion for supplying the operating grease _GH to the fluid pressure cylinder portion 21 from the outside. As shown in FIG. 7, the flow path 22 is formed on the outer peripheral surface of the cylinder main 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 16f of the bearing lid 16, and the other end (downstream) as shown in FIGS. 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 above-described configuration, the supply mechanism 40 is configured by the grease filler plugs 6 and 7, the channel 4 b, the channel 16 f, the channel 17 d, the channel 22, and the connection channel 30.

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 6A, 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 and 5 and the flow paths 4b, 16f, 17d, and 22 shown in FIG. 1, the working grease _GH is not used during replacement lubrication (maintenance). Movement may be hindered. For this reason, as shown in FIGS. 4A and 6A, in the initial state, the hydraulic cylinder portion 21 is filled with the working grease _GH without any gap, and the hydraulic pressure cylinder portion 21 starts from FIG. 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 surface of the bearing 12 gradually deteriorates, and wear grease is applied to the grease G in the vicinity of the end surface of the bearing 12 as shown in FIGS. 4 (A) and 6 (A). And so on.
As shown in FIGS. 4 (B) and 6 (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 operating grease _GH passes through the flow paths 4b, 16f, and 22, and the operating grease _GH flows into the fluid pressure cylinder portion 21 as shown in FIGS. 4 (A) and 5 (A). .

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 cylinder chamber 21b, the piston portion 21c presses the extension portion 19e to transmit a driving force, and the movable portion 19 starts moving in a direction away from the bearing 12. As a result, the deteriorated grease Go moves together with the movable portion 19 while being held by the holding portion 19a, and the deteriorated grease _GN is pressed between the bottom portion of the movable portion 19 and the bottom portion of the annular filling chamber 14b. Is done. Therefore, as shown by the two-dot chain line in FIG. 6 (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 holding portion 19a front end surface and the bearing 12 The undegraded grease _GN is gradually filled between the front surface and the front surface. As shown in FIGS. 4 (B) and 6 (C), 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 interposed 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.
On the other hand, as shown in FIGS. 4A and 5A, when the piston portion 21c in the fluid pressure cylinder portion 21 is in the initial state, the opening 30A of the connection flow path 30 is closed. However, as described above, when the working grease _GH is injected through the flow path 22 and the piston portion 21c moves to the left in the drawing by a predetermined amount, FIG. 4 (B) and FIG. ), The opening 30A of the connection flow path 30 is opened, and the working grease _GH passing through the cylinder chamber 21b through the connection flow path 30 is filled in the bearing lid 16 located inside the machine. Guided into chamber 16a. As a result, the grease G consumed in the annular filling chamber 16a in the bearing lid 16 is replenished with the newly supplied working grease _GH . The grease G (Go · G _N ) filled in the filling chamber 14 a located on the outer side of the bearing 12 and the grease G filled in the annular filling chamber 16 a located on the inner side of the bearing 12 pass through the connection channel 30. an actuating grease G _H same quality introduced by not affect the functionality of the grease even they are mixed. In the example of FIG. 5A, the opening 30A is closed by the grease G in the piston portion 21c, and the opening 30A is provided at a position where the opening 30A is opened by the piston 21c being pushed by the grease G and moving. However, when the pressure of the grease G is increased by moving to the piston 21c stroke end, the extension 19e of the movable part 19 or the member that has closed the connection channel 30 is deformed to open the connection channel 30. May be adopted.

A bearing lubrication structure according to an embodiment of the present invention is as follows. There are effects as described below.
(1) In this embodiment, the working grease _{GH formed} of grease and driving the fluid pressure cylinder portion 21 is guided through the connection flow path 30 to the annular filling chamber 16a in the bearing lid 16 inside the machine. Accordingly, the supply mechanism 40 for supplying the operating grease _GH to the fluid pressure cylinder portion 21 feeds the grease together into the filling chamber 14a on the outside of the bearing 12 and the two greasing ports 16d located on the inside of the machine. The entire structure can be simplified, for example, since it is not necessary to provide a movable part (19) as in the outside of the machine in the filling chamber 16a located on the inside of the machine.

(2) In this embodiment, the fluid pressure cylinder portion 21 generates a driving force by the fluid pressure of the working grease _GH , and the fluid pressure cylinder portion 21 transmits the driving force to the movable portion 19 to transmit the movable portion 19. Is driven in the filling chamber 14a. For this reason, even if it is difficult to secure a sufficient working space or installation space outside the bearing lids 14 and 15 shown in FIG. 1, it is possible to secure a sufficient working space and fluid from any place where the work is easy. The movable part 19 can be easily driven by applying a pressure to the fluid pressure cylinder part 21. As a result, the work place at the time of replacing the grease can be changed to an arbitrary position according to the situation around the electric motor frame 2, and the space necessary for the work can be saved. In addition, such a conventional lubrication structure as a conventional bearing is complicated such that the gap between the operation portion of the feed screw mechanism that drives the movable portion and the through hole of the bearing lid is sealed with a sealant before and after the intermediate lubrication operation. Since the work can be omitted, the work burden at the time of replacement lubrication can be reduced.

(3) In this embodiment, the movable portion 19 moves in the filling chamber 14a, so that the deteriorated grease Go on the side close to the bearing 12 is separated from the bearing 12, and the undegraded grease on the side far from the bearing 12 closer to G _N in the bearing 12. Thus, for example, the bearing 12 of the main motor of the railway vehicle in a non-decomposed state, can swap the grease G _N grease Go and undegraded after deterioration, it is stretched enough to aim lubrication life lubricating effect be able to. Further, since a sufficient amount of grease G can be filled in the vicinity of the bearing 12 in the initial state, it is possible to prevent poor lubrication before replacement lubrication. Furthermore, the deteriorated grease Go mixed with wear powder or the like can be forced away from the vicinity of the bearing 12.

(4) In this embodiment, the fluid pressure cylinder part 21 transmits the driving force to the movable part 19 through the piston part 21c that receives the fluid pressure of the working grease _GH and drives in the cylinder chamber 21b. For this reason, it is possible to easily move the movable portion 19 by driving the piston portion 21c simply by the fluid pressure of the working grease _GH .

(Modified Example 1)
In the above-described embodiment, the corner portion (indicated by reference numeral 19h) in contact with the wall portion 14g of the bearing lid 14 is perpendicular to the U-shaped projecting portion constituting the guide portion 19c of the movable portion 19. However, as shown in FIGS. 10A and 10B, the portion 19h may be rounded by rounding the portion 19h. With such a round shape, when the movable portion 19 slides with the wall portion 14g of the bearing lid 14, the corner portion 19h of the movable portion 19 is caught with the wall portion 14g of the bearing lid 14. Is prevented, and smooth movement of the movable portion 19 within the bearing lid 14 can be realized.

(Modified Example 2)
Moreover, in the said embodiment, although it is set as the arrangement | positioning which slides with the wall part 14g of the bearing cover 14 in the cross-sectional view U-shaped part which comprises the guide part 19c of the movable part 19, this sliding part Keys may be placed on That is, as shown in FIG. 11, a key and a key groove (a key is denoted by reference numeral 31) may be provided in the guide portion 19 c of the movable portion 19 that slides relative to each other and the wall portion 14 g of the bearing lid 14. A plurality of such keys and key grooves 31 may be provided, for example, two sets may be provided at an interval of 180 ° in order to give the movable portion 19 a stable linearity.

(Modified Example 3)
Moreover, in the said embodiment (refer FIGS. 1-9), although the guide part 19c of the movable part 19 was formed in the cross-sectional view U-shape, as shown in FIG. You may form the hole 19i in the front-back direction. This through-hole 19i is formed along the moving direction of the movable part 19, and as shown in FIGS. 12 (A) to 12 (C), the fluid pressure cylinder part 21 causes the movable part 19 to move. Along with the movement in the direction of arrow A, the undegraded grease G _N (shown by the pointed drawing) located at the rear is completely replaced with the deteriorated grease Go (shown by black) in contact with the bearing 12. , so that the bearing 12 by the grease G _N yet-degradation is newly lubricated. The through-hole 19i enables smooth replacement of the grease G as shown in FIG.

In the above embodiment, the second path for guiding the grease to the inside of the machine is provided in each of the two flow paths 22 and 22 separated by 180 degrees around the axis for one bearing. Two routes may be provided.
Moreover, in the said embodiment, although the side by which the fluid pressure cylinder part 21 is arrange | positioned was made into the machine outer side and the other was made into the machine inner side, it is not limited to this, You may arrange | position this fluid pressure cylinder part 21 to the machine inner side. .

  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.

  The present invention relates to a lubricating structure applied to a bearing of a main motor of a railway vehicle.

12 Bearing 13 Bearing 14a Filling chamber (filling chamber on one side)
15a Filling chamber (filling chamber on one side)
16a annular filling chamber (the other filling chamber)
17a annular filling chamber (the other filling chamber)
18 Lubrication structure 19 Movable part 21 Fluid pressure cylinder part 30 Connection flow path Go Degraded grease (semi-solid lubricant)
G _N undegraded grease (semisolid lubricant)
Grease for _GH operation (semi-solid lubricant)

Claims (5)

A bearing lubrication structure for lubricating a bearing 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 portion that generates a driving force by a fluid pressure of a working fluid made of a semi-solid lubricant, transmits the driving force to the movable portion, and drives the movable portion;
A lubricating structure for a bearing, characterized in that the working fluid that drives the fluid pressure cylinder portion is guided into the other filling chamber through a connection channel.   The connection flow path is disposed between the fluid pressure cylinder portion and the other filling chamber, and is opened when the piston in the fluid pressure cylinder is moved by a predetermined amount by being pressed by the working fluid. The bearing lubrication structure according to claim 1, wherein a fluid is supplied to the other filling chamber.   3. The bearing lubrication according to claim 2, wherein when the piston is pressed by the working fluid and moves to a moving end, the pressure of the working fluid rises to open the connection flow path. 4. Construction.   In the one filling chamber, when the movable part is moved by the working fluid that drives the fluid pressure cylinder part, the deteriorated semi-solid lubricant in contact with the bearing in the one filling chamber is not yet removed. The bearing lubricating structure according to any one of claims 1 to 3, wherein the lubricating structure is replaced with a deteriorated semi-solid lubricant.   In the other filling chamber, a new semi-solid lubricant is supplied into the other filling chamber by supplying a working fluid made of a semi-solid lubricant through the connection fluid. Item 5. The bearing lubrication structure according to any one of Items 1 to 4.

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