JP2533605Y2 - Phase difference 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 phase difference pump used as a pump having small pulsation in various hydraulic equipments and the like.

[0002]

2. Description of the Related Art FIG. 3 illustrates a conventional phase difference pump.
In this device, a glass hole 102 penetrates a body 101, and three bearing members 103, 10
4 and 105, and gear pump mechanisms 106 and 107 are incorporated between the center bearing member 103 and the left and right bearing members 104 and 105, respectively. The front gear pump mechanism 106 includes a drive gear 109 fixed to a drive shaft 108 and a driven gear 111 fixed to a driven shaft 110.
The rear side gear pump mechanism 107 has a drive gear 113 fixed to a drive shaft 112.
And a driven gear 115 fixed to a driven shaft 114 meshed with each other. The drive shafts 108 and 112 reduce the pitch of the drive gears 109 and 113 by 1 /.
They are connected via a spline section 116 at two shifted positions. Then, fluid sucked from a common suction port (not shown) is discharged from a common discharge port to reduce the pulsation rate.

[0003]

However, in such a conventional structure, the eyeglass hole 102, the bearing member 103,
The positioning of the bearings 104, 105 with the bearing holes must be adjusted in separate machining operations. For this reason, the relative positions of the holes are likely to be out of order due to machining errors and assembly errors, and a gap is generated between each gear outer diameter and the eyeglass hole 102, thereby causing a problem that the volumetric efficiency is likely to be reduced. Also,
If the body 101 and the bearing members 103, 104, and 105 are separate from each other, the fluid tends to leak through the gap S between them, which tends to lower the volumetric efficiency,
Furthermore, when the vibration of the bearing members 103, 104, and 105 acts as an alternating load, fretting wear is caused in the eyeglass holes 102 to promote the above-described leakage.

An object of the present invention is to provide a phase difference pump which can effectively solve such a problem and reduce the number of processing and assembly steps to be economically advantageous.

[0005]

The present invention employs the following configuration to achieve the above object.

That is, in the phase difference pump of the present invention, an intermediate partition having an inner periphery as a bearing hole is integrally provided in a body, and a pair of eyeglass holes are formed at both ends of the body separated by the intermediate partition. A pair of gear pump mechanisms are incorporated so as to be synchronously rotatable by shifting the gear pitch in both eyeglass holes, and a common suction port and discharge port are provided in the gear pump mechanisms.

[0007]

With such a structure, the eyeglass hole and the bearing hole can be simultaneously formed while the body is fixed. For this reason, it is possible to eliminate machining / assembly errors and improve the accuracy of assembling the gear outer diameter to the body hole. In addition, by providing the intermediate partition portion corresponding to the conventional side plate member integrally with the body, it is possible to eliminate the existence of the gap where the leakage of the fluid or the fretting wear occurs.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In this phase difference pump, an intermediate partition 4 having an inner periphery as bearing holes 2 and 3 is integrally provided at the center of the body 1, and glasses are provided at both ends of the body 1 separated by the intermediate partition 4. Holes 5 and 6 are formed. Gear pump mechanisms 7 and 8 are installed in both eyeglass holes 5 and 6, respectively.
0 is fitted.

A gear pump mechanism 7 on the front side engages a drive gear 12 fixed to a drive shaft 11 and a driven gear 14 fixed to a driven shaft 13 with each other. Side plates 15 and 16 forming confining portions for preventing the wear of the portions and generating pressure
Is attached. The two shafts 11 and 13 are provided with the bearing holes 2 and 3 of the body 1 and the bearing holes 1 provided in the front cover 9.
7 and 18 are supported via a bush 19. A three-shaped gasket 20 is embedded in the inner end of the cover 9, and the pressure from the groove surrounded by the gasket 20 balances the pressure of the front side plate 15. On the other hand, the gear pump mechanism 8 on the rear side
A drive gear 22 fixed to the driven shaft 23 and a driven gear 24 fixed to the driven shaft 23 are meshed with each other. Side plates 25, 26 forming recesses
Is attached. The two shafts 21 and 23 are provided with the shaft holes 2 and 3 of the body 1 and the bearing holes 27 provided in the rear cover 10 described above.
28 is supported via a bush 19. A three-shaped gasket 30 is embedded at the inner end of the cover 10, and the pressure from the groove surrounded by the gasket 30 balances the pressure of the rear side plate 26.

Then, the drive shafts 11 and 21 are connected to each other via a spline portion 31 at a position where the pitch between the drive gears 12 and 22 is shifted by 1/2, and the drive gears are sucked from a common suction port IN shown in FIG. The fluid is alternately pumped and can be discharged from the common discharge port OUT in a state where the pulsation rate is reduced.

With such a structure, the body 1
Can be simultaneously machined by machining or the like with the eyeglass hole 2 and the bearing holes 5 and 6 in a state where is fixed. For this reason, the conventional inconvenience of causing relative misalignment between the holes due to machining and assembling can be solved, and high assembling accuracy of the gear outer diameter with respect to the body holes 5 and 6 can be realized to improve the volumetric efficiency. It is possible to increase. In addition, since the intermediate partition 4 corresponding to the conventional side plate member is integral with the body 1, the existence of a gap which is a system of leakage and has the problem of further promoting leakage due to fretting wear is eliminated. And the volumetric efficiency can be further improved.

The cross-sectional shape of each part is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0014]

[Effect of the Invention] Since the phase difference pump of the present invention has the above-described configuration, it is possible to enhance machining and assembling accuracy.
As a result, it is possible to increase internal efficiency by reducing internal leakage and improve mechanical efficiency. In addition, the reduction in the number of parts leads to a reduction in man-hours and costs.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Body 2, 3 ... Bearing hole 4 ... Intermediate partition wall part 5, 6 ... Eyeglass hole 7, 8 ... Gear pump mechanism IN ... Suction port OUT ... Discharge port

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasufumi Sera 25, Niiin Oiwakecho, Ukyo-ku, Kyoto Shimazu Corporation Gojo Plant Hei 3-13480 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. An intermediate partition portion having an inner periphery as a bearing hole is integrally provided in a body, and a pair of eyeglass holes are formed at both ends of the body separated by the intermediate partition portion. A phase difference pump wherein a pair of gear pump mechanisms are assembled so as to be synchronously rotatable, and a common suction port and discharge port are provided in the gear pump mechanisms.