JP3254078B2 - Lubrication mechanism of scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication mechanism for a drive mechanism in a scroll compressor.

[0002]

2. Description of the Related Art Generally, in a scroll compressor, a fixed scroll member and a movable scroll member are meshed with each other to form a compression chamber between the two scroll members. A drive projection is provided on the end surface of the shaft at a position eccentric to the axis of the shaft, and a bush is fitted to the drive protrusion. A boss is formed on the end surface of the movable scroll member, and a bush is engaged with the boss via a bearing. Then, by the rotation of the shaft, the movable scroll member revolves around the axis of the fixed scroll member, the volume of the compression chamber is gradually reduced, and the refrigerant gas is compressed.

In this type of scroll compressor,
The refrigerating machine oil contained in the refrigerant gas is supplied to the fitting portion of the bush to the driving projection and the bearing on the outer periphery of the bush, so that these portions are lubricated.

[0004]

However, in the conventional configuration, the end surface of the bush is arranged in contact with the end surface of the shaft. For this reason, it is difficult to supply the refrigerating machine oil to the fitting portion between the drive projection and the bush located at the center of the bush and the bearing located so as to surround the fitting portion. For this reason, there has been a problem that the fitting portion between the drive projection and the bush and the bearing are seized or locked. Incidentally, the bush is slightly slidable in the axial direction of the shaft with respect to the driving projection.

[0005] The present invention has been made by paying attention to such problems existing in the prior art. The purpose is to smoothly supply the refrigerating machine oil to the fitting portion between the drive projection and the bush on the end face of the shaft and the bearing, and the fitting portion and the bearing between the drive projection and the bush can be provided. It is an object of the present invention to provide a lubrication mechanism for a scroll compressor capable of preventing seizure and locking.

[0006]

According to a first aspect of the present invention, there is provided a lubrication mechanism for a scroll type compressor, wherein at least one of the opposed end surfaces of a shaft and a bush is provided with a refrigeration system. Form a cutout recess to allow the passage of machine oil, and form a flat part on the outer periphery of the drive projection
Flat on the inner circumference of the fitting hole so as to correspond to the outer flat surface.
Notched grooves to form the surface and allow the passage of refrigeration oil
Are formed on both side edges of the inner peripheral flat portion .

[0007] The lubrication of the scroll type compressor according to claim 2
In the invention of the slip mechanism , the opposite end of the shaft and the bush is provided.
At least one of the surfaces is
Forming a notch recess for receiving, the notch recess being on the opening side
It is almost triangular so that it becomes wider .

[0008] The lubrication of the scroll type compressor according to claim 3
In the invention of the slip mechanism , the opposite end of the shaft and the bush is provided.
At least one of the surfaces is
A notch recess for receiving the
Has a surface that stands upright with respect to the direction of rotation .

The lubrication of the scroll type compressor according to claim 4.
In the invention of the slip mechanism , the opposite end of the shaft and the bush is provided.
At least one of the surfaces is
A notch recess for receiving the
In an arc from the outer edge of the
The gist is that it is formed to extend . Claim 5
In the invention of claim 1, the disk according to any one of claims 1 to 4 is provided.
In the lubrication mechanism for a roll-type compressor, the drive protrusion,
At least one of the fitting holes of the bush that fits it
On one side, a notch groove is formed to allow the passage of refrigeration oil.
And the gist of the invention that form.

[0010] In the invention of claim 6, the switch according to claim 4 is provided.
In the lubrication mechanism of the crawl type compressor , the gist of the present invention is that the notch recess extends so as to be directed in a direction opposite to the rotation direction of the shaft.

[0011]

In the lubrication mechanism of the first aspect, the refrigerating machine oil contained in the refrigerant gas is supplied to the fitting portion between the drive projection and the bush through the notch recess between the contact end surfaces of the shaft and the bush. You. Thereafter, the refrigerating machine oil is supplied between the bush and the bearing. Thereby, the fitting portion and the bearing are favorably lubricated. Also, is the refrigerating machine oil
From the outer flat surface of the drive projection to the inner flat surface of the fitting hole.
Supplied smoothly. Thereby, the outer peripheral plane portion and the inner peripheral plane
Accumulation of abrasion powder with the portion is prevented.

[0012]

[0013]

In the lubrication mechanisms of the second and third aspects, the refrigerating machine oil is more effectively introduced. In the lubrication mechanism of the fourth aspect , when the shaft is rotated, the refrigerating machine oil is positively taken into the notch recess and guided to the fitting portion of the drive projection with respect to the fitting hole of the bush. Therefore, the lubrication effect can be improved.

In the lubrication mechanism of the fifth aspect, the refrigerating machine oil
Passes through the notch groove between the drive projection and the fitting hole of the bush.
And supplied to the bearings smoothly. This allows mating
The lubricity of the part and the bearing is further improved. Claim 6
In this lubrication mechanism, the refrigerating machine oil is more effectively introduced.

[0016]

【Example】

(First Embodiment) Hereinafter, a first embodiment of a scroll compressor embodying the present invention will be described in detail with reference to FIGS.

As shown in FIG. 1, a shell 1 is made of aluminum die-cast, and a front housing 2 and a rear housing 3 made of aluminum die-cast are provided on both front and rear end surfaces.
Are fixed by a plurality of bolts (not shown). The fixed scroll member 4 is integrally formed in the shell 1 and includes a substrate portion 4a and a spiral portion 4b protruding from an inner surface thereof.

The movable scroll member 5 is disposed in the shell 1 so as to be relatively rotatable, and includes a substrate portion 5a, a spiral portion 5b projecting from the inner surface thereof, and a boss portion 5c projecting from the outer surface. ing. Then, a compression chamber 6 is formed between the scroll members 4 and 5 by engaging the spiral portion 5b of the movable scroll member 5 with the spiral portion 4b of the fixed scroll member 4.

A shaft 7 constituting a driving mechanism is rotatably supported in the front housing 2 by a bearing 8, and a driving projection 9 is provided on an inner end face thereof at a position eccentric to the axis of the shaft 7. . The bush 10 engages the fitting hole 11 with the driving projection 9 to thereby form the shaft 7.
The balance weight 12 is integrally formed on the outer surface thereof in contact with and supported by the inner end surface of the same. The bearing 13 is fitted on the outer periphery of the bush 10, and the bearing 13 is engaged with the boss 5 c of the movable scroll member 5.
Therefore, when the shaft 7 is rotated, the movable scroll member 5 is revolved around the axis of the shaft 7 by the drive projection 9 via the bush 10 and the bearing 13.

As shown in FIG. 2, a pair of outer peripheral flat portions 9a
Are formed parallel to both side surfaces of the outer periphery of the driving projection 9. The pair of inner peripheral flat portions 11a are formed on both sides of the inner periphery of the fitting hole 11 so as to correspond to the outer peripheral flat portion 9a. The longitudinal dimension α of the fitting hole 11 is set to be about 1 mm longer than the longitudinal dimension β of the driving projection 9. The dimension in the width direction of the fitting hole 11 is set to be several tens μm larger than the dimension in the width direction of the driving projection 9. As a result, the bush 10 can smoothly slide in the longitudinal direction along the outer peripheral flat portion 9a of the driving projection 9. Further, the center 7a of the shaft 7 is arranged at a predetermined interval S1 from the center 10a of the bush 10, and the orbital radius of the movable scroll member 5 is determined by the interval S1. And the driving projection 9
Is inclined at a predetermined angle θ in a direction opposite to the rotation direction R1 of the shaft 7 with respect to a straight line passing through the centers 7a and 10b, and in this embodiment, the angle θ is about 30 degrees.
Set to degree.

As shown in FIG. 1, a detent mechanism 14 is disposed between the movable scroll member 5 and the front housing 2 to prevent the movable scroll member 5 from rotating around its own axis. ing. In other words, the rotation preventing mechanism 14 is configured such that at least three pins 15 arranged at predetermined intervals on the same circumference and the substrate 5a of the movable scroll member 5 are engaged with both ends of each pin 15. And the same number of sleeves 16 and 17 buried in the outer surface of the front housing 2 and the inner surface of the front housing 2. And each sleeve 1
The inner diameter of the movable scroll member 5 is set larger than the outer diameter of the pin 15 by the inner radius of the movable scroll member 5.

The suction chamber 18 is provided with the two scroll members 4, 5
Is formed between the outer peripheral portions of the spiral portions 4b and 5b, into which a refrigerant gas is sucked from a suction port (not shown). The discharge hole 19 is formed at the center of the substrate portion 4a of the fixed scroll member 4, and the compression chamber 6 is formed in the discharge chamber 20 in the rear housing 3.
Is communicated to. The discharge valve 21 is provided at the outer end of the discharge hole 19, and the open position thereof is regulated by a retainer 22.

Next, a lubrication mechanism for lubricating a drive mechanism including the shaft 7 and the bush 10 will be described. As shown in FIGS. 1, 3 and 4, the notch 23 is formed by cold forging on the inner end face of the shaft 7, and is formed between the opposing end face of the shaft 7 and the bush 10 with respect to the drive projection 9. 7 is arranged close to the side opposite to the rotation direction R1. The notch recess 23 is formed in a substantially triangular shape having a wide opening, and an upright surface 23a that stands upright in the rotation direction is formed on the rear side of the shaft 7 in the rotation direction. When the shaft 7 is rotated, the refrigerating machine oil contained in the refrigerant gas in the suction chamber 18 passes through the notch 23 and enters the fitting portion of the drive projection 9 with the fitting hole 11 of the bush 10. Be guided.

As shown in FIGS. 2 and 5, four notches 24 are formed at four corners of the fitting hole 11 of the bush 10, and the fitting hole 1 is formed between the driving projection 9 and the fitting hole 11.
1 extend in parallel along both side edges of each inner peripheral flat portion 11a. The refrigerating machine oil supplied from the notch recess 23 is guided between the outer peripheral flat portion 9a of the driving projection 9 and the inner peripheral flat portion 11a of the fitting hole 11 through each of the notch grooves 24, It is guided into a bearing 13 on the outer periphery of the reference numeral 10.

Next, the operation of the lubrication mechanism of the scroll compressor having the above-described structure will be described. When the shaft 7 of the compressor is rotated, the movable scroll member 5 revolves around the axis of the shaft 7 through the bush 10 and the bearing 13 by the eccentric rotation of the drive projection 9. As a result, the refrigerant gas flows from the suction chamber 18
It is taken into the compression chamber 6 between the scroll members 4 and 5. Then, as the orbiting scroll member 5 revolves, the compression chamber 6 is moved from the outer peripheral portions of the spiral portions 4b, 5b to the central portion, and gradually reduces the volume to perform a compressing action. Therefore,
The refrigerant gas is gradually compressed in the compression chamber 6, and is pushed into the discharge valve 21 through the discharge hole 19 to be discharged into the discharge chamber 20.

During operation of the compressor, a compression reaction force acts on the movable scroll member 5 in the outer peripheral direction and the axial direction. As shown in FIG. 2, the compression reaction force in the outer peripheral direction acts as a force F1 on the center 10a of the bush 10. This force F1 is received by the outer peripheral flat portion 9a of the driving projection 9 via the inner peripheral flat portion 11a of the fitting hole 11.
However, since the outer peripheral flat portion 9a of the drive projection 9 is formed to be inclined by the angle θ as described above, the component F
1 · sin θ acts in a direction to push up the bush 10 along the outer peripheral flat portion 9a.

For this reason, even if there is a slight shape error in the spiral portions 4b, 5b of the fixed scroll member 4 and the movable scroll member 5, the movable scroll member 5 reaches a position where it comes into contact with the spiral portion 4b of the fixed scroll member 4. The orbital motion is performed while increasing the orbital radius. Therefore, the contact line between the scroll members 4 and 5 is reliably formed, and the degree of sealing of the compression chamber 6 is increased, which can contribute to the improvement of the compression performance.

Further, during operation of the compressor, refrigeration oil contained in the refrigerant gas accompanying rotation of the shaft 7
It is supplied from the inside of the suction chamber 18 to the fitting portion of the drive projection 9 with respect to the fitting hole 11 through the notch 23 between the opposed end surfaces of the shaft 7 and the bush 10. After that, the refrigerating machine oil is supplied between the outer peripheral flat portion 9a of the driving projection 9 and the inner peripheral flat portion 11a of the fitting hole 11 through the notch grooves 24 on the inner circumference of the fitting hole 11, and The inside of the bearing 13 on the outer periphery is lubricated and guided to the compression chamber 6.

For this reason, the fitting portion between the fitting hole 11 of the bush 10 and the driving projection 9 and the bearing 13 on the outer periphery thereof can be lubricated. Moreover, since the notch recess 23 has a wide opening and an upright surface 23a that stands upright in the rotation direction of the shaft 7, the refrigerating machine oil is effectively introduced into the notch recess 23, and the lubrication of each part is effective. It is done on a regular basis. Accordingly, it is possible to reliably prevent the risk of seizure or locking between the fitting hole 11 of the bush 10 and the driving projection 9 or the bearing 13 due to insufficient lubrication. Also,
Since the refrigerating machine oil is always guided between the outer peripheral flat surface portion 9a of the driving projection 9 and the inner peripheral flat surface portion 11a of the fitting hole 11, it is possible to prevent wear powder from accumulating on that portion, and to improve the flatness of those portions. The occurrence of surface roughness due to abrasion powder on the portions 9a and 11a can be prevented, and the movement of the bush 10 along the flat portions 9a and 11a can be performed smoothly.

(Second Embodiment) Next, another embodiment of the present invention will be described with reference to FIG. In this example,
A groove-shaped notch recess 23 is formed in the inner end surface of the shaft 7,
From the outer peripheral edge of the shaft 7 to the vicinity of the base end of the driving projection 9, it extends in an arc shape so as to be directed in the direction opposite to the rotation direction of the shaft 7. When the shaft 7 is rotated, the refrigerating machine oil contained in the refrigerant gas in the suction chamber 18 is positively taken into the cutout recesses 23, and the drive projections 9 with respect to the fitting holes 11 of the bush 10 are formed. Is guided to the fitting portion. Therefore, in this embodiment, the lubrication effect can be improved as in the first embodiment.

The present invention is not limited to the configuration of the above-described embodiment, but may be arbitrarily changed and embodied as follows without departing from the spirit of the present invention.

(1) The notch recess 23 is formed between the facing end faces of the shaft 7 and the bush 10 on the side of the bush 10 opposite to the above embodiment, or on both the shaft 7 and the bush 10. With such a configuration, the supply of the refrigerating machine oil to the fitting portion and the bearing can be performed smoothly.

(2) Contrary to the above-described embodiments, the notch recess 23 is provided on the front side in the rotation direction of the shaft 7 with respect to the drive projection 9.
Alternatively, the drive projection 9 is provided on both the front and rear sides in the rotation direction due to bankruptcy. Even with such a configuration, the same effects as those of the above embodiments can be obtained.

(3) The notch groove 24 is formed between the outer peripheral surface of the driving projection 9 and the inner peripheral surface of the fitting hole 11 on the side of the driving projection 9 opposite to the above embodiment, or the driving projection 9 and the fitting hole. 11 and both. Even with such a configuration, the same effect as that of the above embodiment can be obtained.

(4) In the second embodiment, the notch 23 is configured to be directed in the rotation direction of the shaft 7.

[0036]

Since the present invention is configured as described above, it has the following effects.

According to the invention of each claim, the refrigerating machine oil can be smoothly supplied to the fitting portion of the bush with the driving projection on the end face of the shaft and the bearing on the outer periphery thereof.
The possibility that the bearing is seized or locked can be prevented.

According to the first aspect of the present invention, it is possible to prevent the accumulation of wear powder between the outer peripheral flat portion of the drive projection and the inner peripheral flat portion of the fitting hole of the bush, and to accumulate the wear powder. Accordingly, it is possible to prevent a possibility that the revolving motion of the movable scroll member is hindered.

According to the second and third aspects of the invention, the refrigerating machine oil can be more effectively introduced. According to the invention of claim 4 , when the shaft is rotated, the refrigerating machine oil is positively taken into the notch recess and guided to the fitting portion of the drive projection with respect to the fitting hole of the bush. Therefore, the lubrication effect can be further improved.

According to the sixth aspect of the invention, the refrigerating machine oil can be more effectively introduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a scroll compressor embodying the present invention.

FIG. 2 is a partial sectional side view showing a driving mechanism of a movable scroll in the scroll compressor.

FIG. 3 is an exploded perspective view of a main part showing a lubrication mechanism for the drive mechanism.

FIG. 4 is a side view of a shaft showing a lubrication mechanism.

FIG. 5 is a side sectional view of a bush showing a lubrication mechanism.

FIG. 6 is a side view of a shaft showing another embodiment of the lubrication mechanism of the present invention.

[Explanation of symbols]

Reference numeral 4: fixed scroll member, 4b: spiral portion, 5: movable scroll member, 5b: spiral portion, 5c: boss portion, 6: compression chamber, 7: shaft, 9: drive projection, 9a: outer peripheral flat portion,
10 ... bush, 11 ... fitting hole, 11a ... inner peripheral flat part,
13 ... bearing, 23 ... notch recess, 24 ... notch groove.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeru Hisaga 1-1-1 Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (72) Inventor Shinya 2-1-1 Toyota-cho, Kariya-shi, Aichi Toyota Motor Corporation Loom Works (72) Inventor Tetsuhiko Fukanuma 2-1-1 Toyota-cho, Kariya City, Aichi Prefecture Inside Toyoda Automatic Loom Works (56) Reference Literature 3-82888 (JP, U) (58) Field surveyed ( Int.Cl. ⁷ , DB name) F04C 18/02 311 F04C 29/02 311

Claims (6)

(57) [Claims] 1. A fixed scroll member and a movable scroll member are engaged with each other, a bush is fitted to a drive projection projecting from an eccentric position of an end surface of a shaft, and the bush is mounted on a boss portion on an end surface of the movable scroll member. In the scroll compressor, the movable scroll member is revolved around the axis of the fixed scroll member by rotation of the shaft, wherein at least one of the opposed end surfaces of the shaft and the bush is provided. A notch recess for allowing the passage of the refrigerating machine oil , a flat portion is formed on the outer periphery of the drive projection, and
A flat part on the inner circumference of the fitting hole so as to correspond to the outer flat part of
Forming a notch groove inside to allow the passage of refrigerator oil
Lubrication mechanism for scroll compressors formed on both side edges of the flat part . 2. A fixed scroll member and a movable scroll part.
Material with each other, and at the eccentric position of the end face of the shaft
A bush is fitted to the projecting drive projection, and the bush is
A bearing is attached to the boss on the end face of the movable scroll member.
The movable scroll member by rotating the shaft.
Revolve around the axis of the fixed scroll member
In the scroll type compressor, at least one of the opposed end faces of the shaft and the bush is provided.
One of them has a notch to allow the passage of refrigeration oil.
And the notch recess is widened toward the opening side.
A triangular scroll compressor lubrication mechanism. 3. A fixed scroll member and a movable scroll portion.
Material with each other, and at the eccentric position of the end face of the shaft
A bush is fitted to the projecting drive projection, and the bush is
A bearing is attached to the boss on the end face of the movable scroll member.
The movable scroll member by rotating the shaft.
Revolve around the axis of the fixed scroll member
In the scroll type compressor, at least one of the opposed end faces of the shaft and the bush is provided.
One of them has a notch to allow the passage of refrigeration oil.
And the notch recess is formed with respect to the rotation direction of the shaft.
Lubrication mechanism for scroll-type compressors with upright surfaces . 4. A fixed scroll member and a movable scroll portion.
Material with each other, and at the eccentric position of the end face of the shaft
A bush is fitted to the projecting drive projection, and the bush is
A bearing is attached to the boss on the end face of the movable scroll member.
The movable scroll member by rotating the shaft.
Revolve around the axis of the fixed scroll member
In the scroll type compressor, at least one of the opposed end faces of the shaft and the bush is provided.
One of them has a notch to allow the passage of refrigeration oil.
And the notch recess is driven from the outer peripheral edge of the shaft.
It is formed to extend in an arc shape near the base end of the projection.
The lubricating mechanism of that scroll type compressor. 5. A driving projection and a bushing fitted thereto.
The refrigerating machine oil in at least one of the
The lubrication mechanism for a scroll compressor according to any one of claims 1 to 4 , wherein a notch groove for allowing passage is formed . 6. The lubrication mechanism for a scroll compressor according to claim 4 , wherein the notch recess extends so as to be directed in a direction opposite to the rotation direction of the shaft.