JPS6349589Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pump device, and particularly to a vane-type vacuum pump device used as a booster for braking automobiles.

The structure of a conventional vacuum pump device of this type is shown in FIGS. 1 to 3. That is, in each of these figures, reference numeral 1 denotes an electric motor having a drive shaft 2, 3 denotes a vacuum pump driven by this electric motor 1 , and a rotor 31 spline-engaged with the drive shaft 2, and a rotor 31 held by this rotor 31. A plurality of vanes 32 are arranged so as to be slidable in the radial direction.
, a housing 33 that eccentrically surrounds the rotor 31 and vane 32, and an inlet port 34 and an outlet port 35 formed in this housing 33.
5 is an internal combustion engine of the automobile, and 6 is a vacuum tank communicated with the intake port 34.

However, in this vacuum pump device, the rotor 31 of the vacuum pump 3 is rotationally driven via the drive shaft 2 by the operation of the electric motor 1 , and as is well known, the vane 3
Due to the change in the volume of the pump chamber formed by 2, air in the vacuum tank 6 is sucked in from the suction port 34 and is forced out to the discharge port 35. Here, each vane 32 is generally made of a material with good friction such as carbon, but due to the centrifugal force caused by the rotation of the rotor 31, it comes into contact with the inner surface of the housing 33 and generates frictional heat, and this heat generation destroys the binding agent. Significant wear and tear. Therefore, from the hydraulic system of the engine 5 to the oil filler port 3.
6 is supplied with lubricating oil to reduce the coefficient of friction and also to play a part of the role of cooling.Normally, the exhaust air and exhaust lubricating oil use the same outlet, so the exhaust air The outlet 35 is connected to the oil tank of the internal combustion engine 5 to circulate this lubricating oil.

Therefore, in such a conventional configuration, the vacuum pump 3 itself does not have a lubricating ability and is supplied with lubricating oil from the internal combustion engine 5, which complicates the piping around the engine and makes maintenance and inspection complicated. There were some inconveniences such as increased heat.

In view of these conventional drawbacks, this invention provides a self-lubricating vacuum pump device of this type that does not require oiling from an external hydraulic system.

Hereinafter, embodiments of the pump device according to this invention will be described in detail with reference to the drawings.

FIG. 4 shows an embodiment of a pump device according to this invention, and in this figure, the same reference numerals as in the conventional example shown in FIGS. 1 to 3 represent the same or corresponding parts.

Now, in this embodiment, the rotor 31 is formed by permanent magnet pieces 37 disposed on both end faces, and a porous or spongy impregnated member 38 sandwiched between the permanent magnet pieces 37. Impregnating the impregnated member 38 with the lubricating magnetic fluid 4,
It is designed to be magnetically attracted and held by each permanent magnet piece 37.

However, even in the case of the embodiment shown in FIG.
The same operation as in the conventional example is performed, but in this case, due to the centrifugal force caused by the rotation of the rotor 31, the magnetic fluid 4 held in the impregnated member 38 moves to the outer periphery, and a part of it is removed. is supplied into the housing 33 to provide a lubricating effect to each vane 32, thereby reducing the friction of each vane 32, which may cause seizure or heat generation leading to destruction. Moreover, since the centrifugal action stops working due to the stoppage of the rotor 31, most of the magnetic fluid 4 that was previously supplied into the housing 33 is returned to the impregnated member due to the attractive force of the permanent magnet piece 37. 38, which can extend the time it takes to reach its consumption.

Here, the above-mentioned permanent magnet pieces 37 are arranged on both end surfaces of the impregnated member 38, and thereby have a function as a side seal to prevent lubricating oil from leaking or scattering from these end surfaces. There is a great advantage in supplying lubricating oil only to the side of the vane 32 that requires lubrication.

Although the above embodiment is applied to a vacuum pump device, it goes without saying that the present invention can also be applied to a compression pump device.

As detailed above, according to this invention, in a vane type vacuum or compression pump device, the rotor is composed of a porous or spongy impregnated member and a pair of permanent magnet pieces arranged on both sides of the rotor. death,
In addition, a lubricating magnetic fluid is held in this mixing member, and when the rotor is rotating, the magnetic fluid is supplied little by little into the housing by centrifugal force to lubricate each vane, and when the rotor is stopped, it is permanently lubricated. Since most of the supplied magnetic fluid is recovered by the magnetic attraction force of the magnet pieces, the vane can be self-lubricated with only a small amount of consumption, and centrifugal force can be applied from the outer periphery of the co-immersion member, which is sealed on both sides with permanent magnet pieces. Therefore, it can be easily and appropriately carried out, and there is no need for piping for supplying and discharging oil from an external hydraulic system as in the past, which greatly improves the ease of installation in internal combustion engines and other equipment. Since centrifugal force is used for the action, this oil supply is limited to only while the rotor is rotating, which is extremely rational.Moreover, the structure is simple, and it can be provided easily and inexpensively, which has various practical effects. It is something that you have.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional vacuum pump device in use and installation, Fig. 2 is an enlarged longitudinal sectional side view of the same device, Fig. 3 is a sectional view taken along the line in Fig. 2, and Fig. 4 The figure is a vertical sectional side view corresponding to FIG. 2 of a vacuum pump device to which an embodiment of the invention is applied. 1 ...Electric motor, 2...Drive shaft, 3 ...Vacuum pump, 31...Rotor, 32...Vane, 33...
Housing, 37... Permanent magnet piece, 38... Co-immersion member.

Claims (1)

[Scope of utility model registration request] a rotor; a vane held by the rotor;
In a vane type pump device equipped with a cylindrical housing that eccentrically surrounds the rotor, the rotor is made of a porous, spongy combination member and a pair of permanent magnet pieces arranged on both end surfaces of the combination member. What is claimed is: 1. A pump device comprising: a magnetic fluid having lubricating properties impregnated into said co-immersion member;