JPH07317683A - Lubricating structure for compressor - Google Patents

Abstract

PURPOSE:To surely squeeze a lubricant, prevent a contraction passage from being blocked by foreign matter reduce the number of part items, and simplify the structure. CONSTITUTION:An intake chamber 20 is formed in a center housing 2, and a storage chamber 28 storing the compressed gas discharged from a compression chamber is formed in a motor housing 1. A passage communicating the storage chamber 28 and the intake chamber 20 is formed in the center housing 2, and a lubricant 36 in the storage chamber 28 is fed to a prescribed sliding portion on the intake chamber 20 side via the passage based on the differential pressure between both chambers 28, 20. The passage is constituted of an insertion hole 32 opened to the storage chamber 28 and a feed hole 33. A contraction pin 34 forming a contaction passage between it and the inner periphery of the insertion hole 32 is inserted into the insertion hole 32. Part of the connection face 41a of the peripheral wall 41 of the motor housing 1 is provided couplably with the contraction pin 34 as a coupling section for preventing the contraction pin 34 from being released from the insertion hole 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply structure of a compressor for supplying lubricating oil to sliding parts in the compressor.

[0002]

2. Description of the Related Art As an oil supply structure for a compressor of this type, for example, a scroll type compressor, a conventional oil supply structure is disclosed in JP-A-59-1928.
The one disclosed in Japanese Patent Publication No. 90 is known. In this conventional technique, an orifice tube is provided between a discharge chamber that stores compressed refrigerant gas for discharge and a suction chamber that stores suction refrigerant gas. In the discharge chamber, the lubricating oil contained in the refrigerant gas is separated and collects on the inner bottom surface of the discharge chamber, and based on the pressure difference between the discharge chamber and the suction chamber, the lubricating oil accumulated in the discharge chamber passes through the orifice tube to the suction chamber side. Is supplied to. Then, each sliding portion such as the drive mechanism of the movable scroll arranged in the suction chamber is lubricated. At this time, the orifice tube adjusts the supply amount of the lubricating oil to the suction chamber to an appropriate amount, and prevents the pressure in the discharge chamber from escaping to the suction chamber side and reducing the compression efficiency.

However, in this prior art, since the lubricating oil is supplied through the orifice tube, there is a high possibility that the hole of the tube will be blocked by foreign matter. In addition, there is a problem that it is difficult to perform processing for forming a small through hole in the tube. Therefore, in reality, the hole of the orifice tube cannot be made so small, and there is a problem that it is difficult to sufficiently throttle the lubricating oil.

Therefore, a device as shown in FIG. 4 has been conventionally proposed. In the prior art of FIG. 4, a housing 52 having a suction chamber 51 and a housing 54 having a discharge chamber 53 are joined and fixed to a housing 52. Housing 52
A through hole 55 that connects the suction chamber 51 and the discharge chamber 53 to each other is formed in the lower part of the, and the suction chamber 51 side of the through hole 55 is an insertion hole 56 having a larger diameter than the discharge chamber 53 side. or,
A supply hole 57 is formed in the housing 52, one end of which is communicated with the insertion hole 56 and the other end of which is opened toward the suction chamber 51. A pin 58 having a diameter slightly smaller than the inner diameter of the hole 56 is loosely inserted in the insertion hole 56. In this state, the opening of the insertion hole 56 is closed by the race 59 to prevent the pin 58 from coming off, and the sealing property between the insertion hole 56 and the suction chamber 51 is secured.

Therefore, in the prior art of FIG. 4,
The lubricating oil 60 accumulated in the discharge chamber 53 is introduced into the through hole 55, is squeezed through the cylindrical gap formed between the insertion hole 56 and the pin 58, and is sent to the supply hole 57. Then, the lubricating oil 60 is supplied from the supply hole 57 to the suction chamber 51 side to lubricate each sliding portion (not shown) in the suction chamber 51.

As described above, according to this conventional technique, the lubricating oil 6 is used.
0 is narrowed in the cylindrical gap between the insertion hole 56 and the pin 58 loosely inserted in the insertion hole 56. For this reason,
Since it is not necessary to form a small hole for squeezing the lubricating oil 60, the processing can be easily performed. Moreover, since the passage for throttling is formed over a wide range between the insertion hole 56 and the pin 58, there is no fear that foreign matter will block the entire throttle passage.

[0007]

However, in this prior art, it was necessary to provide a dedicated race 59 for preventing the pin 58 from coming off. Therefore, there are problems that the number of parts increases and the structure becomes complicated, the manufacturing cost rises, and the assembling work becomes troublesome.

The present invention has been made to solve the above problems. The purpose is to be able to reliably throttle the lubricating oil, to prevent the passage for the throttling from being blocked by foreign matter, to facilitate processing, and to reduce the number of parts and simplify the structure. The purpose is to provide a compressor oil supply structure.

[0009]

In order to achieve the above object, in the invention of claim 1, a low pressure chamber for containing an intake gas and a gas introduced from the low pressure chamber are compressed inside a housing. A compression chamber and a high-pressure chamber that stores the compressed gas discharged from the compression chamber are provided, and a passage that connects the low-pressure chamber and the high-pressure chamber is formed in the housing, and the high-pressure chamber is based on the pressure difference between the two chambers. The lubricating oil of the compressor is supplied to a predetermined sliding portion on the low pressure chamber side through a passage, the housing includes a first housing and a second housing joined to the first housing. , The passage is formed in the first housing, the passage is opened toward the second housing, and a throttle member that forms a throttle passage between the passage and the inner peripheral surface of the passage is inserted into the passage. On the end of the housing Its throttle member in response to engage the aperture member is provided with a engaging portion for preventing coming off from the passage.

According to the second aspect of the present invention, the engagement portion is a part of a joint surface with the first housing. According to the invention of claim 3,
The high pressure chamber is formed inside the second housing, and one end of the passage is opened to the high pressure chamber.

In the invention of claim 4, the high-pressure chamber is formed inside the second housing, and one end of the second housing is opened to the high-pressure chamber and the other end is opened to the joint surface with the first housing. The introduction hole is formed so as to penetrate, and one end of the passage is opened at the joint surface with the second housing so as to communicate with the other end of the introduction hole.

According to the fifth aspect of the invention, the diameter of the passage-side opening of the introduction hole is smaller than the outer diameter of the throttle member. In the invention of claim 6, a discharge port for discharging the compressed gas in the high pressure chamber to the outside is formed in the second housing, and the opening of the introduction hole on the high pressure chamber side is arranged at a position substantially corresponding to the discharge port. It was done.

According to the invention of claim 7, the passage and the throttle member have a circular cross section.

[0014]

Therefore, according to the first aspect of the present invention, the lubricating oil in the high pressure chamber is throttled through the throttle passage formed between the passage and the throttle member and supplied to the predetermined sliding portion on the low pressure chamber side. To be done. Further, the throttle member is prevented from coming out of the passage by the engaging portion provided on the end side of the second housing. Therefore, it is not necessary to provide a dedicated component to prevent the diaphragm member from coming off.

According to the second aspect of the present invention, the throttle member is prevented from coming off with a simple structure in which it is engaged with a part of the joint surface of the second housing with the first housing. According to the invention of claim 3, the lubricating oil in the high pressure chamber in the second housing is
It is introduced from one end opening of the passage on the first housing side.

According to the fourth aspect of the present invention, the position of the one end opening of the introduction hole for introducing the lubricating oil in the high pressure chamber can be set at an appropriate position on the peripheral wall of the second housing. According to the invention of claim 5, the throttle member in the passage is engaged with the opening edge portion of the introduction hole and is prevented from coming off without being moved into the introduction hole of the second housing.

According to the sixth aspect of the invention, the compressed gas in the high pressure chamber is discharged to the outside through the discharge port. At this time, the most amount of the lubricating oil is accumulated at the position corresponding to the discharge port by receiving the gas flow in the high pressure chamber. Therefore, even if the compressor tilts, the lubricating oil in the high pressure chamber is reliably guided to the introduction hole that opens at a position substantially corresponding to the discharge port, and flows into the passage on the first housing side.

According to the invention of claim 7, the passage and the throttle member can be easily processed.

[0019]

【Example】

(First Embodiment) A first embodiment in which the present invention is embodied in a scroll compressor will be described below with reference to the drawings.

As shown in FIG. 2, the center housing 2 as the first housing has a peripheral wall 43 and a partition wall 44 continuous with the peripheral wall 43. The end of the peripheral wall 43 of the center housing 2 is fixed to the end of the peripheral wall 43 of the motor housing 1 as the second housing, and the seal ring 15 is arranged on the joint surfaces 41a and 43a of the two walls 41 and 43. , The sealing property between them is secured. The fixed scroll 3, which also serves as the rear housing, is fixed to the end of the peripheral wall 43 of the center housing 2 at the end of the peripheral wall 3c. Both the housings 1 and 2 and the fixed scroll 3 are made of an aluminum material, and in this embodiment, the housing is constituted by them.

The stator 4 is fixed to the inner peripheral surface of the motor housing 1. The rotary shaft 5 is supported by the side wall 42 of the motor housing 1 and the partition wall 44 of the center housing 2 via bearings 6 and 7, and a rotor 8 made of a permanent magnet is fixed to the outer circumference thereof. Then, when the stator 4 is supplied with electric power, the rotating shaft 5 is rotated.

The eccentric shaft 9 is provided so as to project from the tip of the rotary shaft 5 and is located inside the center housing 2. The bush 10 is integrally rotatably supported by the eccentric shaft 9, and a bearing 11 is fitted to the outer periphery of the bush 10. The balance weight 13 is supported by the eccentric shaft 9. The movable scroll 12 is made of an aluminum material, and has a cylindrical boss portion 12c on the outer surface thereof.
By being fitted into the bearing 11, the bush 11 is supported by the bush 10 so as to be relatively rotatable.

The fixed scroll 3 comprises a base plate 3a and a spiral wall 3b integrally formed on the inner surface thereof. Similarly, the movable scroll 12 also includes a substrate 12a and a spiral wall 12b integrally formed on the inner surface thereof. The scrolls 3 and 12 are meshed with each other on the scroll walls 3b and 12b, and the end faces in the axial direction of the scroll walls 3b and 12b are opposed to the base plate 12 of the scrolls 12 and 3.
It is pressed against a and 3a. As a result, the compression chamber 14 is formed by the substrates 3a and 12a and the scroll walls 3b and 12b of both scrolls 3 and 12.

The orbiting ring 16 made of a ferrous metal is interposed between the base plate 12a of the movable scroll 12 and the pressure receiving surface 44a of the partition wall 44 of the center housing 2 facing the base plate 12a. A plurality of columnar rotation preventing elements 17 are fixed to the swivel ring 16 so as to penetrate therethrough.
Are arranged at equal intervals along the circumferential direction. The pressure receiving surface 44a and the base plate 12a of the orbiting scroll 12 are formed with the same number of revolution position regulating holes 18 and 19 as that of the element 17, and these regulating holes 18 and 19 are arranged at equal intervals. The ends of the elements 17 are inserted into the restriction holes 18 and 19, respectively.

The movable scroll 12 has a rotary shaft 5
When is rotated, the eccentric shaft 9 revolves around the axis of the rotating shaft 5 via the bush 10 and the bearing 11. At this time, the pressure receiving surface 44a and the movable scroll 12
The movable scroll 12 is restricted from rotating about its own axis by inserting the element 17 on the orbiting ring 16 into the restriction holes 18 and 19 formed in the base plate 12a. Further, the compression reaction force generated in the compression chamber 14 acts on the substrate 12a of the movable scroll 12 in the direction in which the axis of the rotating shaft 5 extends, and this reaction force is applied to the pressure receiving surface 44a via the orbiting ring 16. Be taken.

The suction chamber 20 as a low pressure chamber is formed inside the center housing 2, and the eccentric shaft 9, the bush 10 on the eccentric shaft 9, the balance weight 13 and the like are arranged in the suction chamber 20. The center housing 2
The side bearing 7 also faces the suction chamber 20. The suction port 21 is formed in the center housing 2 and is connected to an external cooling circuit via a pipe (not shown). Then, the refrigerant gas introduced from the external cooling circuit through the suction port 21 flows into the compression chamber 14 between the scrolls 3 and 12 through the suction chamber 20 in the center housing 2. The outer wall 22 is fixed to the outer surface of the substrate 3a of the fixed scroll 3, and the discharge chamber 23 is provided between the outer wall 22 and the substrate 3a.
Are formed. Discharge port 24 is a fixed scroll 3
Is formed at the center of the substrate 3a to communicate the compression chamber 14 with the discharge chamber 23. The discharge valve 25 is arranged at the outer end of the discharge port 24, and its open position is regulated by the retainer 26.

The discharge passage 27 is formed through the fixed scroll 3 and the center housing 2, and the discharge chamber 23 is a storage chamber 2 as a high pressure chamber formed in the motor housing 1.
Connect to 8. The discharge port 29 is formed at the center of the side wall 42 of the motor housing 1 and communicates with the housing chamber 28 via a communication hole 30 formed in the rotary shaft 5. The discharge port 29 is connected to an external cooling circuit via a pipe (not shown). The ring-shaped separating plate 31 is attached to the inner surface of the side wall 42 of the motor housing 1 so as to surround the rotating shaft 5.

As shown in FIGS. 1 and 2, the insertion hole 32 having a circular cross section is formed in the partition wall 44 at a position corresponding to the inner peripheral surface of the peripheral wall 43 at the lower portion of the center housing 2 and its outer end. Is opened at the bottom of the accommodation chamber 28.
The supply hole 33 having a circular cross section is formed in the partition wall 44 of the center housing 2. One end of the supply hole 33 communicates with the inner end of the insertion hole 32, and the other end thereof substantially corresponds to the pressure receiving surface 44a and the bearing 7. 5 is opened in the supporting portion. In this embodiment, by the insertion hole 32 and the supply hole 33,
A passage that connects the storage chamber 28 and the suction chamber 20 is formed. A diaphragm pin 34 as a cylindrical diaphragm member
Is loosely inserted in the insertion hole 32 so as to be movable in the axial direction, and its outer diameter H1 is formed to be slightly smaller than the inner diameter H2 of the insertion hole 32. A cylindrical throttle passage is formed in the gap between the throttle pin 34 and the insertion hole 32.

The peripheral wall 41 of the motor housing 1 is formed such that its inner diameter is slightly smaller than the inner diameter of the peripheral wall 43 of the center housing 2 on the joint surface 43a side. With this configuration, when the two housings 1 and 2 are joined to each other, a part of the joint surface 41a of the peripheral wall 41 of the motor housing 1 slightly projects inward from the joint surface 43a of the peripheral wall 43 of the center housing 2 to form the step portion 35. Is formed. Incidentally, this step 3
The height H3 of 5 is set to be slightly larger than the difference (H2-H1) between the inner diameter H2 of the insertion hole 32 and the outer diameter H1 of the throttle pin 34. In this embodiment, the step portion 3
An engaging portion is formed by a part of the joint surface 41 a of the motor housing 1 that forms part 5. And aperture pin 3
4 has its protruding end engaged with the step 35,
It is prevented from coming out of the insertion hole 32.

Next, the operation of the scroll compressor constructed as described above will be described. When the rotor 8 and the rotary shaft 5 are rotated by energizing the coil of the stator 4, the eccentric shaft 9 is eccentrically rotated to move the movable scroll 12 to the rotary shaft 5.
Revolves around the axis of. As a result, the refrigerant gas introduced from the suction port 21 flows into the suction chamber 20 and is taken into the compression chamber 14 between the scrolls 3 and 12. As the movable scroll 12 revolves, the compression chamber 1
4 is moved from the outer peripheral side of the spiral portions 3b and 12b to the center side, and the volume is gradually reduced to perform the compression action. Therefore, the refrigerant gas is gradually compressed in the compression chamber 14, and is discharged into the discharge chamber 23 by pushing and opening the discharge valve 25 from the discharge port 24. Then, the discharged refrigerant gas is pressure-fed to the housing chamber 28 through the discharge passage 27, and is discharged from the discharge port 29 to the external cooling circuit side through the communication hole 30 of the rotating shaft 5.

Here, the discharge refrigerant gas introduced into the communication hole 30 of the rotary shaft 5 collides with the inner surface of the separation plate 31 and the storage chamber 28, and the lubricating oil contained therein is separated and drops downward, The lubricating oil collects on the inner bottom surface of the storage chamber 28. Then, the accumulated lubricating oil 36 forms the throttle passage between the insertion hole 32 and the throttle pin 34 based on the difference between the discharge refrigerant gas pressure in the storage chamber 28 and the suction refrigerant gas pressure in the suction chamber 20. Through the supply hole 33, the pressure receiving surface 44a and the bearing 7
Is supplied to the supporting portion of the rotary shaft 5 which substantially corresponds to.

Therefore, the supplied lubricating oil 36 allows the pressure receiving surface 44a, the base plate 12a of the movable scroll 12 and the orbiting ring 16 to slide, and the rotary shaft 5 to be smoothly lubricated with a proper lubrication. As a result, wear of these sliding parts is prevented. In this embodiment, the center housing 2 and the movable scroll 12 are made of an aluminum material, and the orbiting ring 16 is made of a ferrous metal material. Therefore, the center housing 2
The pressure receiving surface 44a and the sliding contact portion between the orbiting ring 16 and the base plate 12a of the movable scroll 12 are not welded by frictional heat. Further, by squeezing the lubricating oil 36 by the throttle passage, the supply amount of the lubricating oil 36 to the suction chamber 20 can be adjusted to an appropriate amount, and the pressure in the storage chamber 28 escapes to the suction chamber 20 side and is compressed. It is possible to prevent the efficiency from decreasing.

As described above, in this embodiment, the lubricating oil 36 is squeezed by the cylindrical throttle passage between the insertion hole 32 and the throttle pin 34 loosely inserted in the insertion hole 32. Therefore, it is not necessary to form a small hole for squeezing the lubricating oil 36, and the relatively large insertion hole 32 and the insertion hole 32
Since it is only necessary to form the diaphragm pin 34 having the outer diameter H1 slightly smaller than the inner diameter H2, the processing can be easily performed. Moreover, since the insertion hole 32 and the throttle pin 34 have a circular cross section, and the insertion hole 32 is formed in the partition wall 44 at the position of the inner peripheral surface of the peripheral wall 43, their machining is very easy. In addition, since the throttle passage is formed over a wide range between the insertion hole 32 and the throttle pin 34,
There is no fear that foreign matter will block the entire throttle passage.

In addition, in this embodiment, the projecting end of the throttle pin 34 loosely inserted in the insertion hole 32 is engaged with the step portion 35 which is a part of the joint surface 41a of the motor housing 1. , Is prevented from coming off from the insertion hole 32. Therefore, it is not necessary to provide a dedicated component for preventing the stop of the throttle pin 34, and the stop can be realized with a very simple structure, and both housings 1, 2
It can be easily performed at the same time as the joining work of. Therefore,
The number of parts can be reduced and the structure can be simplified. Therefore, the manufacturing cost can be reduced and the assembling work of the compressor can be simplified.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. Now, as shown in FIG.
In the second embodiment, the position of the passage for introducing the lubricating oil 36 in the accommodation chamber 28 is different from that in the first embodiment. That is, the introduction hole 37 is provided through the peripheral wall 41 in the lower portion of the motor housing 1, one end of which is opened to the inner bottom surface of the housing chamber 28 at a position substantially corresponding to the discharge port 29 and the communication hole 30, and the other end is joined. Surface 41
It has an opening at a. In addition, the insertion hole 3 of the center housing 2
2 is opened to the joint surface 43a of the peripheral wall 43 of the center housing 2 so as to communicate with the opening of the introduction hole 37 on the joint surface 41a side. Further, the joint surfaces 41a, 43 of the both walls 41, 43 are arranged so as to surround the openings of the insertion hole 32 and the introduction hole 37.
A seal ring 39 is arranged at a.

In the second embodiment, the introduction hole 37
Has an inner diameter H4 that is the outer diameter H1 of the throttle pin 34 in the insertion hole 32.
It is formed to be slightly smaller. With this configuration, when the housings 1 and 2 are joined, the insertion hole 32
Part of the joint surface 41a of the motor housing 1,
That is, the opening edge of the introduction hole 37 is exposed and the step 38
Is formed. In the second embodiment, a part of the joint surface 41a of the motor housing 1 forming the step portion 38
An engaging portion is configured. The throttle pin 34 is prevented from coming off the insertion hole 32 by engaging the end portion thereof with the step portion 38.

Also in this embodiment, the first
Similar to the embodiment, it is not necessary to provide a dedicated component for preventing the stop pin 34 from coming off, and the stop can be realized with a very simple configuration.

The refrigerant gas in the accommodation chamber 28 introduced through the discharge passage 27 is discharged from the discharge port 29 through the communication hole 30 of the rotary shaft 5. At this time, as shown in FIG. 3, by receiving the flow of the refrigerant gas in the accommodation chamber 28, the lubricating oil 36 is most accumulated at the position on the side corresponding to the communication hole 30 and the discharge port 29. But this second
In the embodiment, the introduction hole 37 for introducing the lubricating oil 36 in the storage chamber 28 is opened in the inner bottom surface of the storage chamber 28 at a position substantially corresponding to the discharge port 29 and the communication hole 30.
Therefore, even if the compressor tilts, the accommodation chamber 28
The lubricating oil 36 inside can be surely guided to the introduction hole 37,
The lubricating oil 36 can be reliably supplied to each sliding portion through the throttle passage on the center housing 2 side and the supply hole 33. Therefore, in the second embodiment, as compared with the first embodiment, the lubricating oil can be supplied more reliably, and the refrigerant gas in the storage chamber 28 is surely prevented from escaping to the suction chamber 20 side. can do.

The present invention is not limited to the above-mentioned embodiment, and the constitution of each part can be modified and embodied as follows. (1) In the first embodiment, the inner diameter of the peripheral wall 41 of the motor housing 1 is set to be the same as the inner diameter of the peripheral wall 43 of the center housing 2 on the joint surface 43a side, and the step portion 35 is not formed. 1. A projection as an engaging portion that is engageable with the diaphragm pin 34 is integrally formed on the inner bottom surface of the first connecting surface 41a side. Even in this case, as compared with the case where the race is provided as in the conventional case, it is possible to prevent the diaphragm pin 34 from coming off with a very simple structure.

(2) In the second embodiment, the introduction hole 3
7 on the side of the joint surface 41a, and the joint surface 43 of the insertion hole 32.
By providing it in a state of being shifted with respect to the opening on the a side,
The joint surface 41 of the motor housing 1 is provided at the opening of the insertion hole 32.
Face part of a.

(3) The scroll type compressor should be embodied as a type that is not integrally provided with a motor portion for driving the rotary shaft 5 and is operated by receiving power from the outside.

(4) The present invention is embodied in a compressor other than the scroll compressor, for example, a reciprocating compressor such as a swash plate compressor.

[0043]

As described in detail above, the present invention has the following excellent effects. According to the inventions of claims 1 to 7, the lubricating oil can be surely throttled, there is no possibility that the passage for the throttle is blocked by a foreign matter, the machining is easy, and the number of parts is reduced. The structure can be simplified.

In particular, according to the inventions of claims 4 to 6, even when the compressor is tilted, the lubricating oil in the high pressure chamber can be surely guided to the passage, and the lubricating oil can be slid on the low pressure chamber side. The compressed gas in the storage chamber can be surely prevented from escaping to the low pressure chamber side while being surely supplied to the moving part.

[Brief description of drawings]

FIG. 1 is a first embodiment in which the present invention is embodied in a scroll compressor.
It is a longitudinal section showing an example.

FIG. 2 is a partially enlarged cross-sectional view showing a main part of the first embodiment.

FIG. 3 is a partially enlarged sectional view showing a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor housing as 2nd housing which comprises a housing, 2 ... Center housing as 1st housing which comprises a housing, 3 ... Fixed scroll which comprises a housing, 7 ... Bearing, 14 ... Compression chamber, 1
6 ... Swirl ring, 20 ... Suction chamber as low pressure chamber, 28 ...
Storage chamber as a high-pressure chamber, 29 ... Discharge port, 30 ... Communication hole,
32 ... Insertion hole forming passage, 33 ... Supply hole forming passage, 34 ... Throttle pin as throttle member, 35 ... Step portion, 36 ... Lubricating oil, 37 ... Introduction hole, 38 ... Step portion, 41
... peripheral wall, 41a ... joint surface constituting the engaging portion, 43 ... peripheral wall, 43a ... joint surface, 44 ... partition wall, 44a ... pressure receiving surface, H
1 ... Outer diameter of throttle pin, H2 ... Inner diameter of insertion hole, H3 ... Height of stepped portion, H4 ... Inner diameter of introduction hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Ishigure, 2-chome, Toyota-cho, Kariya city, Aichi prefecture Toyota Industries Corporation

Claims (7)

[Claims] 1. A low-pressure chamber for containing an intake gas, a compression chamber for compressing a gas introduced from the low-pressure chamber, and a high-pressure chamber for containing a compressed gas discharged from the compression chamber, inside the housing. A passage is formed in the housing to connect the low pressure chamber and the high pressure chamber, and the lubricating oil in the high pressure chamber is supplied to a predetermined sliding portion on the low pressure chamber side through the passage based on the pressure difference between the two chambers. In the oil supply structure for a compressor, the housing includes a first housing and a second housing joined to the first housing, and the passage has a first
A throttle member is formed in the housing to open the passage to the second housing side, and a throttle member that forms a throttle passage between the passage and the inner peripheral surface of the passage is inserted into the passage, and the throttle member is provided on the end side of the second housing. Is an oil supply structure for a compressor, which is provided with an engaging portion for engaging with the throttle member and preventing the throttle member from coming out of the passage. 2. The oil supply structure for a compressor according to claim 1, wherein the engagement portion is a part of a joint surface with the first housing. 3. The oil supply structure for a compressor according to claim 1, wherein the high pressure chamber is formed inside the second housing, and one end of the passage is opened to the high pressure chamber. 4. A high-pressure chamber is formed inside the second housing, and a peripheral wall of the second housing has an introduction hole that has one end opening to the high-pressure chamber and the other end opening to a joint surface with the first housing. The oil supply structure for the compressor according to claim 2, wherein the oil passage structure is provided and one end of the passage is opened in a joint surface with the second housing so as to communicate with the other end of the introduction hole. 5. The oil supply structure for a compressor according to claim 4, wherein the diameter of the passage-side opening of the introduction hole is smaller than the outer diameter of the throttle member. 6. A discharge port for discharging the compressed gas in the high pressure chamber to the outside is formed in the second housing, and the opening of the introduction hole on the high pressure chamber side is arranged at a position substantially corresponding to the discharge port. Item 4. An oil supply structure for a compressor according to Item 4 or 5. 7. The oil supply structure for a compressor according to claim 1, wherein the passage and the throttle member have a circular cross section.