JP2587648Y2 - Planetary gear pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear pump for transferring a viscous fluid such as ink and paint to a plurality of flow paths at a constant rate.

FIG. 6 is a sectional view showing a typical prior art planetary gear pump 1, and FIG. 7 is a left side view of the planetary gear pump 1. As shown in FIG. The partition wall 3 arranged at the center is sandwiched between two casings 4 and 5, and each casing 4, 5 is
Between the two side plates 6 and 7. Two sun gears 9 and 10 are fixed to a drive shaft 8 that is driven to rotate around the rotation axis. For example, four planetary gears 11a to 11d; ~
13d are respectively arranged. Planetary gears 11a, 13a; 11b, 13b; 11c, 13 forming a pair on the same axis.
c; 11d, 13d are connected to shafts 14a to 14d,
When the sun gears 9 and 10 are driven to rotate in the direction of arrow A1, they are driven to rotate in the direction of arrow A2. Sun gears 9 and 10 and planetary gears 11a to 11
d; meshing portions 15a to 15 meshing with 13a to 13d
Inflow holes 18a to 18d; 19a to 19d communicate with the entry space formed downstream of the rotation directions A1 and A2 with respect to d, and a viscous fluid such as ink or paint is supplied. Rotation direction A with respect to the meshing portions 15a to 15d
The outlet space formed on the upstream side of the air outlets 1 and 2 has an outflow hole 16.
a to 16d; 17a to 17d communicate with each other, and the viscous fluid extruded by the meshing of the teeth of the planetary gears 11a to 11d; 13a to 13d with the teeth of the sun gears 9 and 10 is discharged. Such prior art is disclosed, for example, in Japanese Patent Publication No. 44-893 (Japanese Patent Application No. 40-60636).

[0003]

In such a prior art, the sun gear 9 and the planetary gears 11a to 11d provided near one side plate 6 and the sun gear 10 and the planetary gears 13a provided near the other side plate 7 are provided. To 13d for supplying the viscous fluid respectively to the inflow holes 18a to 18d:
19a to 19d have different path lengths, so that even if a viscous fluid is supplied at the same pressure, a pressure difference occurs in the entrance space due to a difference in flow path resistance, and therefore the first stage planetary gears 11a to 11d And the second stage planetary gear 13a
There is a problem that the supply condition of the viscous fluid is different from that of １３13d. In order to make the supply conditions of such a viscous fluid the same, the diameter of the sun gear is increased, all the planetary gears 11a to 11d; 13a to 13d are meshed, and each planetary gear extends radially from the rotation axis of the sun gear. Although it is easily conceivable to form an inflow hole communicating with each entry space formed between the gear and the gear, in this case, the peripheral speed at the peripheral portion of the sun gear increases, and sufficient lubrication is achieved. A problem arises that it cannot be performed.

Accordingly, an object of the present invention is to supply a viscous fluid under the same supply conditions to each of the inlet spaces formed between the sun gear and each of the planetary gears without causing insufficient lubrication, thereby providing a plurality of flow paths. The present invention provides a planetary gear pump capable of transferring a fixed amount to a planetary gear.

[0005]

According to the present invention, two side plates 2 are provided.
A pump chamber 28 is formed in a casing 25 sandwiched between 3, 3 and 24. A sun gear 26 fixed to a drive shaft 30 that is rotationally driven in a predetermined rotation direction A1 in the pump chamber 28; A plurality of planetary gears 27 which are arranged at equal intervals in the circumferential direction and mesh with and are driven by the sun gear 26 are housed therein, and the rotation of the sun gear 26 and the planetary gears 27 is made greater than the meshing portion 29. Direction A1
The viscous fluid supplied to the entrance space 49 formed between the sun gear 26 and each planetary gear 27 on the downstream side is stored in the tooth groove of each planetary gear 27, and is rotated more in the rotational direction than the meshing portion 29. In the planetary gear pump for transferring and pushing out to the outlet space 50 formed on the upstream side of A1, the two side plates 23 and 24 are formed with shaft holes 31 and 33 through which the drive shaft 30 is inserted, respectively. Drive shaft 30 disposed in the shaft hole 31 of
Is retracted toward the inner surface 46 from the outer surface 45 of the side plate 23 where the shaft hole 31 is formed to form an input port 48, and the pump chamber 28 of the two side plates 23 and 24 is formed. Are formed in the radial direction of the lubrication grooves 50 to 59 for communicating the inlet space 49 with the shaft holes 31 and 33 and the outlet space 50 with the shaft holes 31 and 33, respectively. 48, one end 4 of the drive shaft 30
A tapered guide surface 47 is formed on the input port 4.
The input port 48 is provided on one side plate 23 on which the
And a plurality of flow paths 53 that communicate with the respective entry-side spaces 49.
Are formed radially.

[0006]

According to the present invention, a sun gear 26 and a sun gear 26 are provided in a pump chamber 28 formed in the casing 25.
And a plurality of planetary gears 27 that mesh with each other. The drive shaft 30 of the sun gear 26 is inserted into shaft holes 31 and 33 formed in each of the side plates 23 and 24 to be supported. One side plate 2
One end 44 of the drive shaft 30 in the axial direction inserted into the third shaft hole 31 is retracted toward the inner surface 46 with respect to the outer surface 45 of the side plate 23 and is formed in a tapered shape. 48 are formed. The sun gear 26 and each planetary gear 2
On the downstream side in the rotation direction A1 with respect to the meshing portion 29 with which the meshing portion 7 meshes, entry-side spaces 49 are respectively formed, and each entry-side space 4 is formed.
9 and the input port 48 are communicated with each other by a plurality of flow paths 53. Thereby, the inflow paths of the viscous fluid into each of the inlet spaces 49 are set to the same length, so that the supply conditions of the viscous fluid supplied to each of the inlet spaces 49 are the same. The inner surfaces 46 of the side plates 23 and 24 facing each other with the pump chamber 28 interposed therebetween are provided with lubricating grooves 56 to radially communicate an outlet space 50 having a high pressure and an inlet space 49 having a low pressure. Since the 59 is formed, the high-pressure viscous fluid extruded into the outlet space 50 is guided to the inlet space 49 side through the concave grooves 56 to 59, whereby the inner surface 46 of each of the side plates 23 and 24 and Lubrication with the sun gear 26 can be achieved.

[0007]

FIG. 1 is an enlarged sectional view showing a planetary gear pump 21 according to an embodiment of the present invention, and FIG. 2 is a front view of the planetary gear pump 21 as viewed from the left side of FIG. Two side plates 2
A pump chamber 28 in which a sun gear 26 and a plurality of (eight in this embodiment) planetary gears 27 are accommodated is formed in a casing 25 sandwiched between the planetary gears 3 and 24, and the planetary gears 27 are arranged at equal intervals in the circumferential direction. And meshed with the sun gear 26
Are engaged.

A drive shaft 30 is fixed to the sun gear 26, and the power from a motor (not shown) is reduced on the drive shaft 30 by a speed reducer or the like, and is driven to rotate at 28 rpm in the direction of arrow A1, for example. The drive shaft 30 is inserted into shaft holes 31 and 33 formed in each of the side plates 23 and 24,
The metal bearings 34 and 35 are rotatably supported by the metal bearings 34 and 35, respectively. One metal bearing 35 is prevented from being pulled out by a pressing member 37 in a liquid-tight state via an annular seal member 36, and the pressing member 37 is fixed to one side plate 24 by a bolt 38. The side plate 24 also has a shaft hole 39.
A shaft 40 that supports the planetary gear 27 is press-fitted into the shaft hole 39. In addition, each side plate 23, 2
The casing 4 and the casing 25 are positioned with high precision by a lock pin 41 and a bolt 43 screwed thereto, and are fixed to each other.

The one axial end 44 of the drive shaft 30 inserted into the shaft hole 31 of the other side plate 23 is
The outer surface 45 is formed so as to retreat closer to the inner surface 46 abutting on the casing 25 than the outer surface 45, and a tapered frustoconical guide surface 47 is formed at a tip end thereof, and an input port 48 is formed. Is done. One end of a plurality (eight in this embodiment) of flow paths 53 radially formed at regular intervals in the circumferential direction is opened at the input port 48, and the other end is connected to the sun gear 26 and the planetary gear 27. Rotation direction A than the meshing portion 29
1 and A2, and open to the entrance space 49 formed on the downstream side. Further, the gears 26, 2
Outlet space 5 formed on the upstream side in the rotation directions A1 and A2 of 7
Numerals 0 communicate with the output ports 51, respectively. Accordingly, the viscous fluid having a viscosity of about 5 to 50 poise, such as ink or paint, supplied to the input port 48 flows into each flow path 53 and is supplied to the entry space 49 at a uniform pressure. Since the flow path length of each flow path 53 is the same, each flow path 5
3 have the same flow resistance to the viscous fluid,
The pressure differential of the fluid caused by 3 is very small.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG. 4 is a sectional view taken along the line IV-IV of FIG. The inner surfaces 46 and 54 of the side plates 23 and 24 facing each other have respective shaft holes 3 with respect to the center axis 55.
Concave grooves 56, 57 extending radially outward from the first and the third radially across the entrance space 49 and the exit space 50 from the outside in the radial direction;
58 and 59 are formed. These grooves 56 to 59 are
As shown in an enlarged manner in FIG. 5, it is U-shaped, and its width B is selected to be, for example, about 0.5 mm. By forming such concave grooves 56 to 59, the viscous fluid passes between the shaft holes 31, 33 and the outer peripheral surface of the drive shaft 30 from the outlet space 50, which becomes a high pressure, and the inlet side becomes a low pressure. Space 4
9 by which the drive shaft 30 and the sun gear 2
6 lubrication can be achieved. Especially these grooves 5
By providing 6 to 59, the diameter of the sun gear 26 is increased by a single-stage gear pump, the number of planetary gears meshing with the sun gear 26 is increased, and a planetary gear pump with a large number of ports is realized. be able to. Even if the diameter becomes large in this way, the supply conditions of the viscous fluid to the entrance space 49 can be made uniform and a large number of flows can be obtained, and the viscous fluid such as ink or paint that easily deteriorates or discolors stays. The number of locations can be reduced as much as possible, and the viscous fluid can be smoothly pumped in a fixed amount.

[0011]

As described above, according to the present invention, a tapered guide surface 47 is formed at one end 44 of the drive shaft 30 facing the input port 48, and is guided radially outward by the guide surface 47. Since the viscous fluid can be guided to the plurality of radially formed flow paths 53 and uniformly supplied to the inlet space 49, a uniform flow of the viscous fluid can be obtained from the plurality of outlet spaces 50. . Moreover, the inner surface 4 of each side plate 23, 24
Since the concave grooves 56 to 59 are formed in the groove 6, reliable lubrication can be achieved regardless of the diameter of the sun gear 26. Therefore, it is possible to increase the diameter of the sun gear 26 and increase the number of the planetary gears 27 meshing with the sun gear 26 to realize a planetary gear pump capable of discharging a viscous fluid from a large number of discharge ports in a constant amount.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a planetary gear pump 21 according to an embodiment of the present invention.

FIG. 2 is a left side view of the planetary gear pump 21.

FIG. 3 is a cross-sectional view taken along line III-III in FIG.

FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 1;

FIG. 5 is a cross-sectional view taken along the line VV of FIG. 3;

FIG. 6 is a cross-sectional view showing a typical prior art planetary gear pump 1.

FIG. 7 is a left side view of the planetary gear pump 1 shown in FIG.

DESCRIPTION OF SYMBOLS 21 planetary gear pump 23, 24 side plate 25 casing 26 sun gear 27 planetary gear 28 pump chamber 29 meshing part 30 drive shaft 31, 33 shaft hole 44 one end of drive shaft 30 45 outer surface of side plate 23 46, 54 Inner surface 48 Input port 49 Inlet space 50 Outlet space 51 Outlet port 53 Flow path 56, 57, 58, 59 Groove

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F04C 2/08 F04C 11/00 F04C 13/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A pump chamber 28 is formed in a casing 25 sandwiched between two side plates 23, 24, and a sun gear fixed to a drive shaft 30 that is rotationally driven in a predetermined rotation direction A1 in the pump chamber 28. 26, and a plurality of planetary gears 27 which are arranged at equal intervals in the circumferential direction around the sun gear 26 and mesh with and are driven by the sun gear 26 are housed therein. The viscous fluid supplied to the entry space 49 formed between the sun gear 26 and each of the planetary gears 27 on the downstream side in the rotation direction A1 with respect to the meshing portion 29 is stored in the tooth space of each of the planetary gears 27. In the planetary gear pump, which is transferred to the outlet space 50 formed on the upstream side in the rotation direction A1 with respect to the meshing portion 29 and extruded, the two side plates 23 and 24 have shafts through which the drive shaft 30 is inserted. Holes 31,3 There are formed respectively, one of the axial hole 3
The input port 48 is formed by retracting the one end 44 of the drive shaft 30 disposed in the inner side 46 from the outer surface 45 of the side plate 23 in which the shaft hole 31 is formed. On the inner surface 46 of each of the two side plates 23 and 24 facing the pump chamber 28, lubrication grooves 50 to 59 for communicating the inlet space 49 and the shaft holes 31 and 33 and the outlet space 50 and the shaft holes 31 and 33 are formed. The drive shaft 30 is formed in the radial direction and faces the input port 48 at one end 44 of the drive shaft 30.
A tapered guide surface 47 is formed, and a plurality of flow paths 53 that radially communicate the input port 48 and each of the input side spaces 49 are formed radially on one side plate 23 on which the input port 48 is formed. A planetary gear pump.