JP3847847B2 - Grease injection jig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grease injection jig for injecting grease into a bearing in which a plurality of rotating rollers are rotatably supported between a cage and an inner ring.
[0002]
[Prior art]
Conventionally, for example, assembling work of a rubber joint and a pulley shaft as shown in FIG. That is, the bearing body 91 to which the outer ring B14 of the bearing is attached is inserted into the rotating shaft 92 (FIG. 8A), grease is injected into the bearing B1, and then the bearing B1 is placed on the rotating shaft 92 and press-fitted with a press (FIG. 8). 8 (b)). Next, grease is injected into the groove of the spacer 93, and the spacer 93 is inserted into the bearing body 91 (FIG. 8C). Subsequently, after injecting grease into the other bearing B2, it is put on the rotating shaft 92 and press-fitted with a press (FIG. 8D). Then, the outer ring B24 of the bearing B2 is inserted into the bearing body 91. Finally, grease is injected into the bearing lid 94 and fixed to the bearing body 91 with bolts (FIG. 8 (e)). The rubber joint and the pulley shaft have been assembled by performing the assembling work in this way.
[0003]
[Problems to be solved by the invention]
When such assembling is performed, the work of injecting grease into the bearing is performed manually by an operator using an iron spatula or the like.
However, since it is difficult to inject grease into the inside of the bearing, i.e., the gap between the cage and the inner ring, compared to the outside of the bearing, i.e., the outside of the cage, it was difficult to uniformly inject the grease into the entire bearing (note that For example, refer to Fig. 4 for the configuration of the bearing, that is, the bearing B2 in Fig. 4 has a plurality of rotating rollers B23 rotatably supported between a cage B21 and an inner ring B22.
[0004]
In addition, since the amount of grease injected is often specified for each shape of the bearing, it was grasped by measuring before and after the grease injection. In this case, since the grease is attached around the bearing, the weighing operation is not easy, and the operator will be measuring several times until the amount of grease injected substantially matches the specified amount. Was cumbersome.
[0005]
Furthermore, when grease is manually poured, the workability is not good because the grease adheres to the gloves.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a grease injection jig that can inject a desired amount of grease into the entire bearing substantially uniformly and that is excellent in workability.
[0012]
[Means for Solving the Problems and Effects of the Invention]
In order to solve the above-mentioned problem, the invention according to claim 1 is a grease injection jig for injecting grease into a bearing in which a plurality of rotary rollers are rotatably supported between a cage and an inner ring, A storage portion for storing the bearing in a state in which the inner space of the inner ring of the bearing is closed, a grease injection port provided at an upper portion of the storage portion for injecting grease from the outside to the storage portion, and a board surface serving as the storage portion A disc-like member having a gap with the inner surface of the upper portion, an outer edge having a gap with the inner surface of the side portion of the storage portion, and further covering a gap between the bearing retainer and the inner ring, and the disc-like member Among them, a plurality of through holes provided at positions facing the gap between the bearing retainer and the inner ring without facing the grease inlet, provided at the lower part of the storage part, and connecting the storage part and the outside The air hole that communicates For example, wherein the void volume when accommodating the bearing to the housing portion is substantially coincident with the predetermined grease injection volume.
[0013]
In such a grease injection jig, the plurality of through holes serve as the second lead-out path, and the gap between the plate-like member and the inner side surface of the storage portion serves as the first lead-out path. The first lead-out path refers to a lead-out path that guides the grease injected from the grease inlet to the outside of the bearing cage, and the second lead-out path refers to the grease injected from the grease inlet through the bearing. This refers to the lead-out path leading to the gap between the vessel and the inner ring. Further, the gap between the disk surface of the disk-shaped member and the upper inner surface of the storage part serves as a storage part that can store the grease injected from the grease injection port on the surface that covers substantially the entire upper part of the bearing . That is, the grease injected from the grease injection port once accumulates almost uniformly on the surface of the board, and the grease is led out substantially uniformly for each of the plurality of through holes. Further, the grease is not led out from a part of the outer edge of the disk-shaped member but from the entire circumference of the outer edge. For this reason, the grease is more easily and uniformly injected into substantially the entire bearing.
[0014]
In addition, if the present inventors adopt a configuration in which the grease inlet is provided at the upper portion of the storage portion and the air hole is provided at the lower portion of the storage portion, the point in time when the grease begins to be discharged from the air hole We found that it was consistent with the time of fullness. This is presumably due to the fact that the grease is so-called paste-like and has no viscosity. For this reason, the completion of grease injection can be visually confirmed, and the end of the operation can be easily confirmed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The embodiments of the present invention are not limited to the following examples, and it goes without saying that various forms can be adopted as long as they belong to the technical scope of the present invention.
[0017]
FIG. 1 is an explanatory view of a lower lid of a grease injection jig, where (a) is a plan view, (b) is a front partial sectional view, and (c) is a bottom view. 2A and 2B are explanatory views of the upper lid of the grease injection jig. FIG. 2A is a plan view, FIG. 2B is a front partial sectional view, and FIG.
The grease injection jig 1 of this embodiment is mainly composed of a lower lid 10 and an upper lid 20.
[0018]
As shown in FIG. 1, the lower lid 10 includes a circular bottom surface 10 a and a cylindrical side surface 10 b in appearance. Inside the lower lid 10, a lower storage portion 11 that is a concave portion having a substantially truncated cone shape is formed, and a female screw portion 12 is formed above the lower storage portion 11. The lower surface 11 a of the lower storage portion 11 is provided with an air hole 13 that communicates the outside with the lower storage portion 11. Further, an insertion hole 14 is provided in the approximate center of the lower surface of the lower storage portion 11, and a support portion 15 a of the guide shaft 15 is fitted into the insertion hole 14.
[0019]
As shown in FIG. 2, the upper lid 20 has a circular ceiling surface 20a and a cylindrical side surface 20b in appearance. In the upper lid 20, an upper storage portion 21 that is a concave portion having a substantially truncated cone shape is formed, and a male screw portion 22 is formed below the upper storage portion 21. A screw hole 23 into which a grease nipple 30 (see FIG. 3) can be screwed is provided on the upper surface 21 a of the upper storage portion 21, and a plate-like member 25 is provided via a cylindrical portion 24. The disk-like member 25 is disposed with a gap from the upper surface 21 a of the upper storage portion 21 due to the presence of the cylindrical portion 24, and its outer edge is disposed with a clearance from the side surface 21 b of the upper storage portion 21. The disk-like member 25 is provided with through holes 26 at four locations.
[0020]
Next, an operation for injecting grease into the pair of bearings by the grease injection jig 1 will be described with reference to FIGS. FIG. 3 is a cross-sectional view of the grease injection jig when the bearing is stored in the storage portion, and FIG. 4 is an explanatory view when the grease is supplied to the grease injection jig. As shown in FIG. 3, the bearing B1 is a well-known bearing in which a plurality of rotating rollers B13 are rotatably supported between a cage B11 and an inner ring B12, and the bearing B2 is the same as this. belongs to.
[0021]
First, the inner ring B12 of the bearing B1 is inserted into the guide shaft 15 of the lower lid 10 to which the upper lid 20 is not screwed, and the bearing B1 is accommodated in the lower accommodating portion 11 of the lower lid 10. At this time, each rotary roller B <b> 13 of the bearing B <b> 1 is in line contact with the side surface 11 b of the lower storage portion 11. Further, the air hole 13 is not covered with the cage B13 or the like of the bearing B1.
[0022]
Next, the inner ring B22 of the other bearing B2 is inserted into the guide shaft 15, and the wide-mouth sides of the pair of bearings B1 and B2 are made to coincide with each other. At this time, the height of the upper portion of the bearing B <b> 2 substantially coincides with the upper surface of the guide shaft 15.
Subsequently, the male screw portion 22 of the upper lid 20 is screwed into the female screw portion 12 of the lower lid 10. At this time, each rotary roller B23 of the bearing B2 is in line contact with the side surface 21b of the upper storage portion 21 of the upper lid 20. Further, the four through holes 26 provided in the disk-like member 25 face between the cage B21 and the inner ring B22. Note that the upper portion of the bearing B2 and the disk-like member 25 are arranged with a gap.
[0023]
In this state, a grease gun or a grease pump (not shown) is connected to the grease nipple 30, and the grease is pressurized and supplied into the grease injecting jig 1 little by little. Then, the grease spreads almost evenly on the upper surface of the plate-like member 25 via the grease nipple 30 as shown by a dotted arrow in FIG. 4, and a part of the grease passes through the four through holes 26 and the grease is held by the bearing B2. Guided by the gap between the cage B21 and the inner ring B22, a part is led not from a part of the outer edge of the disk-like member 25 but from the entire outer edge to the outside of the cage B21 of the bearing B2. The former grease is further guided to the gap between the cage B11 of the bearing B1 and the inner ring B12, and the latter grease is further led to the outside of the cage B11 of the bearing B1.
[0024]
When the pressure supply of grease is continued, the grease is finally discharged from the air hole 13. At this time, since it has been empirically confirmed that the grease has filled the gap between the upper storage portion 21 and the lower storage portion 11 of the grease injection jig 1, the supply of grease is stopped and the grease gun is replaced with the grease nipple 30. Remove from. Then, the upper lid 20 is rotated to release the screwing, and the upper lid 20 is removed. Thereafter, the bearings B2 and B1 are extracted.
[0025]
For example, as shown in FIG. 5, hook-shaped tips (bent outward) of both legs 32, 32 of the substantially U-shaped extraction jig 31 are hooked on the inner peripheral side of the cage B21 of the bearing B2. The bearing B2 is extracted by lifting it in the direction of the white arrow, and then, as shown in FIG. 6, the hooked tips (inwardly) of both legs 32 ′ and 32 ′ of the substantially U-shaped extraction jig 31 ′. The bearing B1 may be pulled out by hooking the bent portion) to the outer peripheral side of the inner ring B12 of the bearing B1 and lifting it in the direction of the white arrow.
[0026]
As described above, according to the grease injecting jig 1 of the present embodiment, a desired amount of grease is applied to the entire bearings B1 and B2 (particularly, the clearance between the rotating roller and the cage of the bearing, the clearance between the rotating roller and the inner ring). In addition, the operator's hand is not soiled and does not need to be measured, so that the workability is excellent. The bearings B1 and B2 thus filled with grease can be used as components of the rubber joint or pulley shaft shown in FIG. 7 according to the assembly procedure shown in FIG.
[0027]
In the above-described embodiment, for example, when the gap capacity when the bearings B1 and B2 are stored in the lower storage section 11 and the upper storage section 21 is a capacity of 180 g to 270 g of grease, the air hole 13 is 2 mm in diameter. The gap between the member 25 and the side surface 21b of the upper storage portion 21 was 1.5 mm, and the through hole 26 was φ4 mm.
[0028]
In the above embodiment, for example, as shown in FIG. 5, a plurality of (for example, two) round grooves 18 are provided on the bottom surface 10 a of the lower lid 10, and a jig mounting base 37 is fitted to the round grooves 18. If the convex portion 38 is provided, it is not necessary to hold the lower lid 10 when the upper lid 20 of the grease injection jig 1 is rotated to release and remove the screw, and the upper lid can be easily removed.
[0029]
Further, before supplying grease into the grease injecting jig 1, an exhaust pump is connected to the air hole 13, the inside of the grease injecting jig 1 is kept in a substantially vacuum state, the air hole 13 is then closed, and the grease nipple 30 You may supply grease from.
[Brief description of the drawings]
1A and 1B are explanatory views of a lower lid of a grease injection jig, wherein FIG. 1A is a plan view, FIG. 1B is a front partial sectional view, and FIG.
FIGS. 2A and 2B are explanatory views of an upper lid of a grease injection jig, wherein FIG. 2A is a plan view, FIG. 2B is a partial front sectional view, and FIG. 2C is a bottom view;
FIG. 3 is a cross-sectional view of a grease injection jig when a bearing is stored in a storage unit.
FIG. 4 is an explanatory diagram when grease is supplied to a grease injecting jig.
FIG. 5 is an explanatory view when a bearing is extracted.
FIG. 6 is an explanatory diagram when the bearing is extracted.
FIG. 7 is a perspective view (partial cross-sectional view) of a rubber joint or pulley shaft.
FIG. 8 is an explanatory diagram showing an assembly procedure of a rubber joint or a pulley shaft.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Grease injection jig | tool, 10 ... Lower lid, 11 ... Lower storage part, 13 ... Air hole, 15 ... Guide shaft, 20 ... Upper lid, 21 ... Upper side Storage part, 21a ... Upper surface (upper inner surface), 21b ... Side surface (side inner surface), 25 ... Disk-shaped member,
26 ... Through hole, 30 ... Grease nipple, 91 ... Bearing body, 92 ... Rotating shaft, 93 ... Spacer, 94 ... Bearing lid, B1, B2 ... Bearing, B11 , B21 ... cage, B12, B22 ... inner ring, B13, B23 ... rotating rollers, B14, B24 ... outer ring.

Claims (1)

A grease injection jig for injecting grease into a bearing in which a plurality of rotary rollers are rotatably supported between a cage and an inner ring, wherein the bearing is closed in a state where an inner space of the inner ring of the bearing is closed. A storage portion to be stored; a grease supply port provided at an upper portion of the storage portion for supplying grease from the outside to the storage portion; a panel surface having a gap with an upper inner surface of the storage portion; and an outer edge on a side of the storage portion A plate-like member having a gap with the inner surface of the member and further covering the gap between the bearing retainer and the inner ring, and holding the bearing without facing the grease supply port of the plate-like member. Grease injection comprising: a plurality of through holes provided at positions facing a gap between the container and the inner ring; and an air hole provided at a lower portion of the storage unit and communicating the storage unit with the outside jig.

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