JP3024290B2 - Dual oil pump system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-type oil supply pump device which is mounted on a shaft end of a drive shaft in a scroll compressor or the like and has two stages of a so-called positive displacement pump mechanism having a rotor and a yoke. .

[0002]

2. Description of the Related Art Conventionally, a so-called positive displacement type pump mechanism having a single stage is known, for example, from Japanese Patent Application Laid-Open No. 3-88995. The one used for oil injection to be supplied to a compression chamber defined between the spiral bodies and the other side used for lubrication to be supplied to a bearing portion of a drive shaft, etc. 2-268195
No. (October 4, 1990).

As shown in FIG. 3, the dual oil supply pump device according to the prior proposal has an upper first eccentric portion A and a lower second eccentric portion below a rotor R fitted to a drive shaft D. Part B
The first and second eccentric portions A and B are eccentric in directions different from each other by 90 degrees with respect to the axis of the drive shaft D, and are defined by the first eccentric portion A and the first yoke X. When the first pump chamber P is secured only on the opening side of the first suction hole L1 and is not secured on the opening side of the first discharge hole H1, the second eccentric portion B and the second yoke Y define the first pump chamber P. The relationship is such that the second pump chamber Q is equally secured on each opening side of the second suction hole L2 and the second discharge hole H2.

[0004]

However, if the two eccentric portions A and B are eccentric in directions different from each other by 90 degrees as described above, it becomes difficult to process the eccentric portions A and B. In addition, the first suction hole L1 opened in the first eccentric portion A and the second suction hole L2 opened in the second eccentric portion B are mutually 90
Similarly, the first discharge hole H1 and the second discharge hole H2 deviate from each other by 90 degrees, so that it becomes necessary to open lateral holes in four directions around the outer peripheral portion of the rotor R. Due to space restrictions, the side holes that open the suction shaft hole and the discharge shaft hole extending in the axial direction to the side do not match the radial directions of the eccentric portions A and B. The portions A and B need to be formed obliquely from the outer surfaces, and there is a problem that the processing becomes difficult as a whole.

A main object of the present invention is to provide a dual oil supply pump device which can improve the workability of the rotor portion by devising the eccentric directions of the two eccentric portions and the configuration of the oil hole.

[0006]

Therefore, in order to achieve the above-mentioned main object, in the present invention, first, a boss portion 30 to be fitted to the drive shaft 9 and an upper-stage side provided below the boss portion 30 are juxtaposed. A rotor 3 having a first eccentric portion 1 and a lower second eccentric portion 2;
First and second yokes 4, which are fitted to the outer peripheral portions of the eccentric portions 1, 2 to define first and second pump chambers 10, 20, respectively.
And a dual oil supply pump device that pumps oil into a first oil supply passage 91 provided outside the drive shaft 9 and a second oil supply passage 92 provided inside the drive shaft 9. And the second eccentric portions 1 and 2 are eccentric in the same direction with respect to the axis of the drive shaft 9, and the space between the suction shaft hole 6 provided inside the rotor 3 and each of the pump chambers 10 and 20. The eccentric portions 1 and 2 are communicated with each other through first and second suction lateral holes 61 and 62 that match in the radial direction.
A first discharge shaft hole 71 communicating with the first pump chamber 1
0 through a first discharge lateral hole 81 that matches the radial direction of the first eccentric part 1.
Between the second pump shaft 20 and the second discharge shaft hole 72 provided on the inner center side of the second discharge passage 92 and communicating with the second oil supply passage 92 in the radial direction of the second eccentric portion 2. The connection was made through the lateral hole 82.

Second, in order to simplify the structure of the oil delivery portion between the two oil supply passages 91 and 92, the first means is provided with a projection 30a at the center of the upper portion of the boss portion 30, and A step portion 90a is provided at the bottom of the fitting hole 90 of the boss portion 30 in the drive shaft 9, and the projection 30a and the step portion 9 are formed by press-fitting the boss portion 30 into the fitting hole 90.
0a to provide an annular chamber 30b around the outer periphery of the projection 30a and communicating with the first oil supply passage 91 and defining the second oil supply passage 92.
A first discharge shaft hole 71 was formed, and a second discharge shaft hole 72 was formed at the upper end of the projection 30a.

Third, in order to ensure that the amount of oil pumped into the second oil supply passage 92 in the drive shaft 9 is appropriate, the above-mentioned second means uses a pressure contact portion between the projection 30a and the step portion 90a. A regulating hole 90c for regulating the amount of oil released from the second discharge shaft hole 72 to the second oil supply passage 92 is opened at the center of the spacer 90b with the spacer 90b interposed therebetween.

[0009]

By the first means, the first and second eccentric portions 1 and 2 are eccentric in the same direction, so that the formation of each of the eccentric portions 1 and 2 is facilitated. By making the eccentric directions of the parts 1 and 2 the same, the first suction side hole 61 and the second suction side hole 62 open in the same direction, and the first discharge side hole 81 and the second discharge side hole 82 are in the same direction. The horizontal holes can be processed at only two locations on the circumference of the rotor 3. Further, each of the horizontal holes 61, 62,
Since 81 and 82 are provided in conformity with the radial direction of each eccentric part 1 and 2, the processing of each side hole can be easily performed.

By the above-mentioned second means, the annular chamber 30 b communicating with the first oil supply passage 91 and the second oil supply passage 92 are formed only by press-fitting the boss portion 30 of the rotor 3 into the fitting hole 90 of the drive shaft 9.
The seal between the first oil supply passage 9 and the first oil supply passage 9 can be easily performed.
It is possible to simplify the structure of a portion for delivering oil to the first and second oil supply passages 92.

By the third means, the amount of oil released to the second oil supply passage 92 at the restriction hole 90c is made an appropriate amount, and the amount of oil pumped to the second oil supply passage 92 is prevented from becoming excessive. Can be.

[0012]

FIG. 1 shows a scroll compressor in which a lower end of a drive shaft 9 of a scroll compressor has a boss portion 30 which is press-fitted via a press-fit portion 31, and a flange portion 32 located below the boss portion 30. A rotor 3 having an upper first eccentric portion 1 and a lower second eccentric portion 2 arranged side by side at the lower portion of the rotor, and vertically fitted to the outer peripheral portions of the eccentric portions 1 and 2 with a partition plate 45 interposed therebetween. And first and second yokes 4 and 5 having long holes 40 and 50 defining first and second pump chambers 10 and 20, and a lower surface of the rotor 3 is supported by a lower portion of the drive shaft 9. A key (not shown) which is supported by a thrust plate 94 attached to the lower housing 93 and extends in the short axis direction of the long holes 40 and 50 in the yokes 4 and 5 is provided in a lower portion of the lower housing 93 in a sliding groove. To the outside of the drive shaft 9 as the drive shaft 9 rotates. It is a dual-type oil pump apparatus in which the respective oil pumped gel so on and the second oil supply passage 92 provided inside the first oil supply passage 91 and the drive shaft 9 provided on.

The oil pumped to the first oil supply passage 91 is supplied to a compression chamber defined between scroll scrolls, and the oil pumped to the second oil supply passage 92 is supplied to the upper portion of the drive shaft 9. The bearing parts are supplied.

With the above configuration, as clearly shown in FIG.
The axis E of the first and second eccentric portions 1 and 2 is eccentric in the same direction with respect to the axis O of the drive shaft 9.

A suction shaft hole 6 provided inside the rotor 3 and corresponding to a suction port 95 provided in a thrust plate 94 on the lower surface of the rotor 3, and the pump chambers 1.
0 and 20 are communicated with each other through first and second suction lateral holes 61 and 62 that match in the radial direction of each of the eccentric portions 1 and 2.

The first pump chamber 10 is provided between the first pump shaft 10 and a first discharge shaft hole 71 which is provided on the inner peripheral side of the rotor 3 and communicates with the first suction passage 91 as described later. The eccentric portion 1 is communicated via a first discharge lateral hole 81 that matches the radial direction.

Further, a second discharge shaft hole 72 provided on the inner center side of the rotor 3 and communicating with the second oil supply passage 92.
Between the second eccentric part 2 and the second pump chamber 20.
Are communicated via the second discharge lateral holes 82 that match in the radial direction of.

Thus, by eccentricizing the first and second eccentric portions 1 and 2 in the same direction, these eccentric portions 1 and 2
Can be arranged concentrically, and the formation of each of the eccentric portions 1 and 2 becomes easy. In addition, by making the eccentric directions of the eccentric portions 1 and 2 the same, the first suction side hole 61 and the The two suction lateral holes 62 open in the same direction, and the first discharge lateral hole 8
The first and second discharge lateral holes 82 are opened in the same direction, and the processing positions of the lateral holes can be limited to only two positions on the circumference of the rotor 3. Further, each of the lateral holes 61, 62, 81, 82 Since the eccentric portions 1 and 2 are provided so as to match in the radial direction, the processing of each side hole can be easily performed.

In the above structure, the projection 30a is provided at the center of the upper part of the boss 30, and the step 90a is provided at the bottom of the fitting hole 90 of the boss 30 in the drive shaft 9. A disk-shaped spacer 90b is interposed between the protrusion 30a and the step 90a, and the boss 30 is press-fitted into the fitting hole 90 so that the space between the protrusion 30a and the step 90a is intermediate. A lateral hole 96 is provided around the outer periphery of the projection 30a to define a second oil supply passage 92 around the outer periphery of the projection 30a, and the annular chamber 30b is provided in the radial direction of the drive shaft 9. Drive shaft 9 and lower bearing metal 9
7 and an annular communication hole 99 formed in the radial direction.
And the first discharge shaft hole 71 in the annular chamber 30b and the projection 30a.
The second discharge shaft hole 72 is opened at the upper end of each.

Although the spacer 90b is provided in the middle of the pressure contact portion between the projection 30a and the step portion 90a, the upper surface of the projection 30a may directly contact the step portion 90a.

Thus, by merely press-fitting the boss portion 30 of the rotor 3 into the fitting hole 90 of the drive shaft 9, the space between the annular chamber 30 b communicating with the first oil supply passage 91 and the second oil supply passage 92 is formed. Can be easily performed, and the structure of a portion for transferring oil to the first oil supply passage 91 and the second oil supply passage 92 can be simplified.

Further, at the center of the spacer 90b interposed at the pressure contact portion between the projection 30a and the step portion 90a, a regulation for regulating the amount of oil supply from the second discharge shaft hole 72 to the second oil supply passage 92 is provided. A hole 90c is opened.

Thus, the amount of oil released to the second oil supply passage 92 at the regulating hole 90c is made appropriate, and the amount of oil pumped to the second oil supply passage 92 can be prevented from becoming excessive.

[0024]

As described above, according to the first aspect of the present invention, the formation of the first and second eccentric portions 1 and 2 is facilitated, and the formation of the suction side holes 61 and 62 and the discharge side holes 81 and 82 is also facilitated. It becomes easier and the workability of the rotor 3 can be improved.

According to the second aspect of the present invention, it is possible to simplify the structure of a portion for transferring oil to the first oil supply passage 91 and the second oil supply passage 92.

According to the third aspect of the present invention, it is possible to prevent the amount of oil pumped into the second oil supply passage 92 from becoming excessive.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a dual oil supply pump device according to the present invention.

FIG. 2 is an enlarged bottom view of a rotor in the oil supply pump device.

FIG. 3 is a sectional view of a dual oil supply pump device according to the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 First eccentric part 2 Second eccentric part 3 Rotor 4 First yoke 5 Second yoke 6 Suction shaft hole 9 Drive shaft 10 First pump chamber 20 Second pump chamber 30 Boss part 61 First suction side hole 62 Second suction side hole 71 first discharge shaft hole 72 second discharge shaft hole 81 first discharge lateral hole 82 second discharge lateral hole 91 first oil supply passage 92 second oil supply passage 90 fitting hole 30a projection 30b annular chamber 90a stepped portion 90b spacer 90c regulating hole

Continuation of the front page (56) References JP-A-3-182695 (JP, A) JP-A-3-88995 (JP, A) JP-A-1-3280 (JP, A) JP-A-3-217693 (JP) , A) JP-A-4-143485 (JP, A) JP-A-63-90685 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 23/00-29/10 331 F04C 18/02 311 F04B 39/02

Claims (3)

(57) [Claims] 1. A rotor 3 having a boss portion 30 fitted to the drive shaft 9, an upper first eccentric portion 1 and a lower second eccentric portion 2 juxtaposed below the boss portion 30; Each eccentric part 1, 2
And the first and second pump chambers 10, 20
A first oil supply passage 91 provided outside of the drive shaft 9 and the drive shaft 9.
And a second oil supply pump 92 for pumping oil into a second oil supply passage 92 provided inside the oil pump, wherein the first and second eccentric portions 1 and 2 are moved in the same direction with respect to the axis of the drive shaft 9. In addition to the eccentricity, the first and second suction lateral holes 6 matching the radial direction of the eccentric portions 1 and 2 are provided between the pump shafts 10 and 20 and the suction shaft hole 6 provided inside the rotor 3.
The first pump chamber 10 is connected to the first pump chamber 10 through the first pump chamber 10 while communicating with the first pump chamber 10 while communicating with the first and second suction passages 91 on the inner peripheral side of the rotor 3. The second discharge shaft hole 7 is provided at the inner center side of the rotor 3 and communicates with the second oil supply passage 92 through a first discharge lateral hole 81 that matches the radial direction of the eccentric part 1.
2 and the second pump chamber 20 are communicated via a second discharge lateral hole 82 that matches the radial direction of the second eccentric part 2. 2. A projection 30a is provided at the center of the upper portion of the boss 30, and a step 90a is provided at the bottom of the fitting hole 90 of the boss 30 in the drive shaft 9, so that the fitting hole of the boss 30 is provided. The protrusion 30 a and the stepped portion 90
a, and an annular chamber 30b communicating with the first oil supply passage 91 and partitioning from the second oil supply passage 92 is provided around the outer periphery of the projection 30a, while the first discharge shaft is provided in the annular chamber 30b. The dual oil pump according to claim 1, wherein a hole (71) and a second discharge shaft hole (72) are opened at the upper end of the projection (30a). 3. A spacer 90b is interposed between the protrusion 30a and the press contact portion between the step portion 90a, and the amount of oil released from the second discharge shaft hole 72 to the second oil supply passage 92 is formed at the center of the spacer 90b. 3. The dual refueling pump device according to claim 2, wherein a regulating hole 90c for regulating is opened.