Compressor

Abstract

To provide a compressor which is suppressed in enlargement and furthermore enabling storage amount of lubricating oil to be increased.SOLUTION: A compressor includes a compressor 2 compressing and ejecting air, and a speed changer 3 supplying power to the compressor. The speed changer comprises: an output shaft; an input shaft 32 supplying rotation force to the output shaft; a speed changing gear connecting the input shaft and the output shaft to each other and transmitting the rotation force of the input shaft to the output shaft while changing rotation force of the input shaft; a gear chamber storing in the inside thereof, the speed changing gear and lubricating oil supplied to the speed changing gear; and a speed changing case 31 where a part of the gear chamber, at least a part of the input shaft, and at least a part of the output shaft are disposed in the inside. A part of at least one of the input shaft and the output shaft projects outward from the speed changing case. The gear chamber has a bulged portion 62 inside which lubricating oil can be stored. The bulged portion bulges from the speed changing case to a side to which at least one of the input shaft and the output shaft projects, and is disposed side by side with at least one of the input shaft and the output shaft.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a compressor that compresses and discharges air.

Background Art

[0002] Conventionally, as a compressor, there is known a screw compressor including a compressor main body that accommodates a pair of male and female screw rotors so as to be meshed with each other, and a speed change device that transmits a rotational driving force from a drive source to the compressor main body. Specifically, the speed change device includes a main shaft that is given a rotational driving force from a drive source, a drive gear attached to the main shaft, an intermediate driven gear and a final driven gear that increase the speed of rotation of the drive gear and transmit it, and a rotor shaft that is attached to the final driven gear and conducts a rotational driving force to the compressor main body. Further, the speed change device includes a speed change gear chamber that accommodates a part of the main shaft and the rotor shaft and a plurality of gears, and lubricating oil is stored at the bottom of the speed change gear chamber so that at least one gear is immersed.

[0003] According to the screw compressor as described above, when the speed change device transmits the rotational driving force from the drive source to the compressor main body, at least one gear immersed in the lubricating oil rotates, so that the lubricating oil jumps up and oil is supplied to each gear accommodated in the speed change gear chamber.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the screw compressor as described in Patent Document 1, since the lubricating oil can be stored only in a part of the space in the speed change gear chamber, the amount of the lubricating oil becomes relatively small. Therefore, the temperature of the lubricating oil easily rises due to heat generated by friction between the gears, etc., and there is a risk that the deterioration of the lubricating oil is accelerated.

[0006] Therefore, an object of the present invention is to provide a compressor capable of increasing the storage amount of lubricating oil while suppressing an increase in size.

Means for Solving the Problems

[0007] The compressor of the present invention includes a compressor that compresses and discharges air, and a transmission that supplies power to the compressor. The compressor includes a rotating compression rotor and a compression case that houses the compression rotor. The transmission includes an output shaft that supplies a rotational force to the compression rotor, an input shaft that supplies a rotational force to the output shaft, a transmission gear that connects the input shaft and the output shaft and transmits the rotational force of the input shaft to the output shaft while changing the speed, a gear chamber that houses the transmission gear and the lubricating oil supplied to the transmission gear, and a transmission case in which a part of the gear chamber, at least a part of the input shaft, and at least a part of the output shaft are provided inside. At least one of the input shaft and the output shaft partially protrudes outward from the transmission case. The gear chamber includes a bulging portion capable of housing the lubricating oil inside. The bulging portion bulges from the transmission case toward the side where at least one of the input shaft and the output shaft protrudes, and is provided side by side with at least one of the input shaft and the output shaft.

[0008] According to such a configuration, the storage amount of the lubricating oil can be increased by the bulging portion, and since the bulging portion bulges from the transmission case toward the side where at least one of the input shaft and the output shaft protrudes and is arranged side by side with the input shaft or the output shaft, an increase in the size of the transmission in the axial direction of the input shaft or the output shaft can be suppressed.

[0009] Further, the gear chamber includes a gear chamber main body that houses the transmission gear, the internal space of the bulging portion is provided in communication with the internal space of the gear chamber main body, and the bottom surface inside the bulging portion can also be located at a height below the bottom surface inside the gear chamber main body.

[0010] According to such a configuration, since the bottom surface inside the bulging portion is located at a height below the bottom surface inside the gear chamber main body, the lubricating oil accumulated in the gear chamber main body easily flows into the bulging portion.

[0011] Further, the bulging portion is provided such that the upper surface inside is located above the lower end of the transmission gear, and the lubricating oil can also be filled such that the liquid level is located above the lower end of the transmission gear and below the upper surface inside the bulging portion.

[0012] According to such a configuration, since the area of the liquid level of the lubricating oil can be increased by the amount of the bulging portion, when the transmission gear stirs up the lubricating oil and the amount of the lubricating oil accumulated at the bottom of the gear chamber decreases, the decrease amount of the liquid level can be suppressed, so that the height of the liquid level of the lubricating oil is stabilized.

[0013] Further, the bottom surface inside the bulging portion can also be located below the lower end of the transmission gear.

[0014] According to such a configuration, since the bottom surface inside the bulging portion is located below the lower end of the transmission gear, the amount of the lubricating oil supplied to the transmission gear can be reliably increased only by the bulging portion.

Effect of the Invention

[0015] According to the present invention, it is possible to obtain a compressor that can increase the storage amount of lubricating oil while suppressing an increase in size.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0017] The screw compressor 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 9. For convenience of explanation, the vertical direction and the front-rear direction will be described based on the directions shown in FIG. 1.

[0018] As shown in FIGS. 1 and 2, the screw compressor 1 includes a transmission 3 and a compressor 2 provided side by side on the rear side of the transmission 3. The screw compressor 1 of the present embodiment is provided in a vehicle such as a powder carrier (not shown), and is configured to receive power supply from the vehicle. The screw compressor 1 of the present embodiment includes a pipe portion 4 for exchanging air with the outside of the screw compressor 1. The pipe portion 4 is a part for connecting the screw compressor 1 and the vehicle. Specifically, the pipe portion 4 includes a suction portion 41 for sucking air outside the vehicle and a discharge portion 42 for discharging the compressed air. In the present embodiment, a case where power is supplied from the engine of the vehicle via a PTO shaft (power take-off shaft) will be described.

[0019] As shown in FIGS. 3 and 4, the compressor 2 includes a compression case 21, a pair of compression rotors 22 provided inside the compression case 21, and a pair of compression shaft portions 23 for supplying a rotational force to the compression rotors 22. The compressor 2 is configured such that the pair of compression shaft portions 23 and the compression rotors 22 rotate by the power (rotational force) that has been speed-changed and output by the transmission 3.

[0020] The compression case 21 is a case provided therein with a compression chamber 21a for storing a pair of compression rotors 22 therein. In the compression case 21 of the present embodiment, an intake port 2a and an exhaust port 2b that communicate the outside of the compression case 21 with the compression chamber 21a are formed. An intake part 41 is connected to the intake port 2a, and an exhaust part 42 is connected to the exhaust port 2b.

[0021] The compression rotor 22 is a rotor that rotates to compress air. The compression rotor 22 of the present embodiment is a pair of male and female rotors provided with tooth parts 222 on the outer peripheral surface. Specifically, the compression rotor 22 includes a cylindrical base part 221 and tooth parts 222 provided so as to protrude radially outward from the base part 221. By rotating such a pair of compression rotors 22, the tooth parts 222 thereof mesh with each other, compress the air on the intake port 2a side, and discharge the compressed air from the exhaust port 2b. Further, since the air on the intake port 2a side is compressed and discharged from the exhaust port 2b, the intake port 2a side becomes a negative pressure, and air is inhaled from the outside into the intake port 2a.

[0022] The compression shaft part 23 is a part that is connected to the compression rotor 22 and transmits the power output from the transmission 3 to the compression rotor 22. Specifically, the compression shaft part 23 includes a rod-shaped compression shaft main body 231 connected to the compression rotor 22 and a synchronous gear 232 provided on the compression shaft main body 231. The synchronous gear 232 receives the power output from the transmission 3 and rotates, and adjusts the rotation speed and rotation direction of each compression shaft part 23 so that the tooth parts 222 of the pair of compression rotors 22 can rotate while meshing with each other.

[0023] According to the compressor 2 configured as described above, air can be inhaled, compressed, and the compressed air can be discharged.

[0024] As shown in FIGS. 5 to 7, the transmission 3 transmits the power (rotational power) input to the transmission 3 after speed change to the compressor 2. In the present embodiment, the transmission 3 transmits the rotational power supplied from the vehicle engine via the PTO shaft after speed change to the compressor 2. Specifically, the transmission 3 includes an input shaft 32 to which rotational power is input, a transmission gear 33 that transmits the rotational power while changing its speed, an output shaft 34 (see FIG. 4) that outputs the changed rotational power, a part of the input shaft 32, the output shaft 34, and a transmission case 31 in which the transmission gear 33 is provided inside. Further, the transmission 3 includes a gear chamber 6 that houses the transmission gear 33 and the lubricating oil 5 supplied to the transmission gear 33.

[0025] The transmission case 31 is a box-shaped part and is a case in which the transmission gear 33 is mainly housed inside. Specifically, the transmission case 31 includes a substantially box-shaped case main body part 311 with an open front, and a front lid part 312 provided so as to cover the opening in front of the case main body part 311. A transmission partition part 313 that partitions the front and rear in the middle part in the front-rear direction is provided in the case main body part 311. Specifically, the case main body part 311 is partitioned by the transmission partition part 313 into a front region 31F formed in the front and a rear region 31R formed in the rear. The front region 31F is defined by the part of the case main body part 311 in front of the transmission partition part 313 and the front lid part 312, and is a region where the transmission gear 33 is mainly stored. The rear region 31R is defined by the part of the case main body part 311 behind the transmission partition part 313 and the outer surface of the compression case 21, and is a region where the synchronizing gear 232 is mainly housed.

[0026] In the present embodiment, the transmission case 31 and the compression case 21 are integrally configured. Specifically, the transmission case 31 and the compression case 21 include an overall partition wall 11 (see FIG. 4) that divides the inside of one case into a front side and a rear side, and in the one case, the front side of the partitioned region is configured as the transmission case 31 and the rear side is configured as the compression case 21.

[0027] The input shaft 32 is a shaft body to which a rotational force is input. One end (front end) of the input shaft 32 is connected to a power source (PTO shaft in this embodiment), and the other end (rear end) is connected to the transmission gear 33. Specifically, the input shaft 32 includes a power connection portion 321 to which the rotational force of the power source is communicably connected, and an input gear connection portion 322 connected to the transmission gear 33. The transmission gear 33 (specifically, the input gear 331) is connected to the outer peripheral surface of the input gear connection portion 322 so as to rotate integrally with the input shaft 32.

[0028] The power connection portion 321 is a portion connected to the power source. Specifically, the power connection portion 321 includes a connection main body portion 3211 connected to the power source so that the rotational force can be transmitted, and a torque limiter 3212 that idles the connection main body portion 3211 when the rotational force from the power source exceeds a certain value. The connection main body portion 3211 of this embodiment is a flange into which the PTO shaft can be inserted. Further, the torque limiter 3212 idles the connection main body portion 3211 with respect to the input gear connection portion 322 when the rotational force supplied from the power source is greater than a certain value, and regulates that a rotational force equal to or greater than the certain value is input to the transmission gear 33 via the input gear connection portion 322.

[0029] The input shaft 32 is provided such that its front end protrudes forward from the transmission case 31. Specifically, in the input shaft 32, the input gear connection portion 322 is provided inside the transmission case 31, and the power connection portion 321 is provided outside the transmission case 31. That is, the power connection portion 321 is provided so as to be located on the front side of the front cover portion 312. Further, the power connection portion 321 is provided such that the torque limiter 3212 and the connection main body portion 3211 protrude forward from the transmission case 31. Specifically, the connection main body portion 3211 is provided so as to be located in front of the torque limiter 3212.

[0030] The transmission gear 33 shifts and outputs the rotational force supplied via the input shaft 32. Further, the transmission gear 33 transmits the rotational force supplied to the input shaft 32 to the output shaft 34 while shifting it. The transmission gear 33 includes a plurality of gears with different diameters. Specifically, the transmission gear 33 includes an input gear 331 connected to the input shaft 32 (input gear connection portion 322) that receives the supply of rotational force from the input shaft 32 and rotates, and a driven gear 332 that rotates in dependence on the rotation of the input gear 331. In the present embodiment, the driven gear 332 has a smaller diameter than the input gear 331. That is, the transmission gear 33 of the present embodiment increases the speed of the rotational force supplied via the input shaft 32 and outputs it. In the present embodiment, the lower end of the input gear 331 is the lower end 331a of the transmission gear 33.

[0031] Among the plurality of driven gears 332, one driven gear 332 is connected to the output shaft 34 and supplies rotational force to the output shaft 34. Specifically, as shown in FIG. 3, among the plurality of driven gears 332, one driven gear 332 is provided on the outer periphery of the output shaft 34 and rotates integrally with the output shaft 34.

[0032] When such transmission gears 33 rotate while meshing, lubricating oil 5 is used to suppress damage and wear of the gears. In the present embodiment, the lubricating oil 5 is provided so as to immerse the lower end portion of the transmission gear 33, and by scraping up or splashing up the lubricating oil 5 while the gears rotate, the lubricating oil 5 can be spread over the entire transmission gear 33.

[0033] The output shaft 34 is provided behind the transmission case 31 and is a portion that connects the transmission 3 and the compressor 2. Specifically, the output shaft 34 is a shaft body whose front end is connected to the transmission gear 33 and whose rear end is connected to the compression shaft portion 23. That is, the rotational force shifted by the transmission gear 33 is transmitted to the compressor 2 (compression shaft portion 23) via the output shaft 34. Further, the output shaft 34 passes through the transmission partition portion 313 and is provided extending from the front region 31F to the rear region 31R. Furthermore, the entire output shaft 34 is housed inside the transmission case 31 (front region 31F and rear region 31R).

[0034] The gear chamber 6 houses the transmission gears 33 and the lubricating oil 5. Specifically, the gear chamber 6 includes a gear chamber main body 61 that houses the transmission gears 33, and a bulging portion 62 provided so as to communicate with the gear chamber main body 61. The lubricating oil 5 is housed in both the gear chamber main body 61 and the bulging portion 62. In the present embodiment, the gear chamber main body 61 is a region (front region 31F) defined by the front cover portion 312 and the transmission case 31. Further, the gear chamber main body 61 and the bulging portion 62 communicate with each other below the position of the liquid level 5a of the lubricating oil 5 during the rotation of the transmission gears 33. That is, the gear chamber 6 houses the lubricating oil 5 in a state where the lubricating oil 5 can flow back and forth between the gear chamber main body 61 and the bulging portion 62.

[0035] As shown in FIG. 5, the bulging portion 62 is a portion that bulges forward from the gear chamber main body 61 (front region 31F). That is, the bulging portion 62 is a portion that protrudes forward from the front end portion (front cover portion 312) of the transmission case 31. Further, the bulging portion 62 is a portion that bulges in the same direction (front side) as the direction in which the input shaft 32 protrudes from the transmission case 31. Furthermore, the amount of bulge of the bulging portion 62 from the transmission case 31 is less than the amount of protrusion of the input shaft 32 from the transmission case 31. Specifically, the amount of bulge of the bulging portion 62 from the transmission case 31 is less than the amount of protrusion of the torque limiter 3212. Also, the bulging portion 62 is a portion that bulges forward from the lower end portion of the transmission case 31.

[0036] As shown in FIGS. 6 and 8, the bulging portion 62 has an internal space 62S and can house the lubricating oil 5 therein. Specifically, the bulging portion 62 has a box shape with an open rear portion, and the open portion communicates with the gear chamber main body 61. The bulging portion 62 includes an upper wall portion 621 that defines the upper surface 62b (the upper end of the internal space 62S) inside the bulging portion 62, a lower wall portion 622 that defines the bottom surface 62a (the lower end of the internal space 62S) inside the bulging portion 62, a front wall portion 624 that defines the front end inside the bulging portion 62, and side wall portions 623 that define the left and right ends inside the bulging portion 62. The upper wall portion 621, the lower wall portion 622, and the side wall portions 623 are wall bodies that extend forward from the front cover portion 312. The front wall portion 624 is a wall body that is connected to the front end portions of the upper wall portion 621, the lower wall portion 622, and the side wall portions 623. Further, the bulging portion 62 of the present embodiment is integrally formed with the front cover portion 312.

[0037] An oil supply port 6211 for supplying the lubricating oil 5 is formed in the upper wall portion 621. The oil supply port 6211 is a through hole formed in the upper wall portion 621 and penetrating in the vertical direction. Further, the oil supply port 6211 is an openable and closable hole. In this way, since the oil supply port 6211 is provided in the upper wall portion 621 of the bulging portion 62, when supplying the lubricating oil 5 to the gear chamber 6, the lubricating oil 5 can be poured from above, so that the oil supply operation becomes easier compared to the case of pouring from the side. Further, since the oil supply port 6211 is provided in the bulging portion 62, the oil can be supplied from near the liquid level 5a of the lubricating oil 5.

[0038] As shown in FIGS. 5, 6, and 9, the internal space 62S of the bulging portion 62 is formed in the vertical direction such that the height of the lower end 331a of the transmission gear 33 is positioned between the upper surface 62b (the upper end of the internal space 62S) and the bottom surface 62a (the lower end of the internal space 62S) inside the bulging portion 62. Specifically, the bulging portion 62 is configured such that the inner surface of the lower wall portion 622 is positioned below the lower end 331a of the transmission gear 33, and the inner surface of the upper wall portion 621 is positioned above the lower end 331a of the transmission gear 33. Further, the bottom surface 62a (the inner surface of the lower wall portion 622) inside the bulging portion 62 is an inclined surface such that the front side is upward and the rear side is downward. Furthermore, the bottom surface 62a (the inner surface of the lower wall portion 622) inside the bulging portion 62 is positioned lower than the bottom surface 61a inside the gear chamber main body 61. Since the bottom surface 62a inside the bulging portion 62 is positioned at a height below the bottom surface 61a inside the gear chamber main body 61, the lubricating oil 5 accumulated in the gear chamber main body 61 easily flows into the bulging portion 62. In particular, in the present embodiment, since the bottom surface 62a inside the bulging portion 62 is positioned lower than the bottom surface 61a inside the gear chamber main body 61, the lubricating oil 5 accumulated in the gear chamber main body 61 easily flows into the bulging portion 62 by gravity.

[0039] The lubricating oil 5 is provided in the gear chamber 6 and lubricates the transmission gears 33. Specifically, the lubricating oil 5 is provided to such an extent that the lower end portion of the transmission gear 33 can be immersed in the gear chamber 6. That is, the lubricating oil 5 is provided in such an amount that the liquid level 5a is located above the lower end 331a of the transmission gear 33. Also, in the vertical direction, the lubricating oil 5 is provided in such an amount that the liquid level 5a is within the range of the internal space 62S of the bulging portion 62. In the present embodiment, the liquid level 5a of the lubricating oil 5 is located above the lower end 331a of the transmission gear 33 and below the upper surface 62b (the inner surface of the upper wall portion 621) inside the bulging portion 62.

[0040] The lubricating oil 5 is provided such that the liquid level 5a is within the range of the internal space 62S of the bulging portion 62 (specifically, it is provided to be located above the lower end 331a of the transmission gear 33 and below the upper surface 62b inside the bulging portion 62). Therefore, the area of the liquid level 5a can be increased by the amount of the internal space 62S of the bulging portion 62. Thus, when the amount (volume) of the lubricating oil 5 scraped up by the transmission gear 33 and accumulated at the bottom of the gear chamber 6 fluctuates, the variation in the height of the liquid level 5a of the lubricating oil 5 can be suppressed compared to the case where the liquid level 5a does not fit within the range of the internal space 62S of the bulging portion 62, and the height of the liquid level 5a of the lubricating oil 5 becomes stable. Also, since the bottom surface 62a (the inner surface of the lower wall portion 622) inside the bulging portion 62 is located below the lower end 331a of the transmission gear 33, the area of the liquid level 5a of the lubricating oil 5 can be increased over the range where the transmission gear 33 can scrape up the lubricating oil 5. Thus, the height of the liquid level 5a of the lubricating oil 5 becomes stable.

[0041] According to the screw compressor 1 configured as described above, the storage amount of the lubricating oil 5 can be increased by the bulging portion 62, and the increase in the axial direction of the input shaft 32 or the output shaft 34 of the transmission 3 can be suppressed.

[0042] Also, in the screw compressor 1 that receives the rotational power supply from a power source that inputs the rotational power to the input shaft 32 via the shaft body, such as the PTO shaft as in the present embodiment, the input shaft 32 includes a torque limiter 3212 and a connection main body portion 3211 provided on the front side of the torque limiter 3212 (the side protruding from the transmission case 31). The bulging portion 62 bulges toward the side where the input shaft 32 protrudes from the transmission case 31, and the amount of bulging of the bulging portion 62 from the transmission case 31 is less than the amount of protrusion of the torque limiter 3212 from the transmission case 31. Therefore, it is possible to prevent the bulging portion 62 from interfering with the shaft body of the power source and making it difficult to connect the shaft body of the power source to the connection main body portion 3211. Further, by effectively utilizing the empty portion in the space where the torque limiter 3212 is provided in the axial direction of the input shaft 32, the storage amount of the lubricating oil 5 can be increased.

[0043] As described above, an example of the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

[0044] For example, although the screw compressor 1 has been described as being provided in a vehicle such as a powder carrier, it can also be configured to be powered by a power source other than a vehicle.

[0045] Also, the transmission 3 has been described as a speed increasing transmission that increases the rotational power of the power source and transmits it to the compressor 2. However, the present invention is not limited to such a configuration, and it may be configured as a speed reducing transmission that reduces the rotational power of the power source and transmits it to the compressor 2. When configured as a speed reducing transmission, the transmission gear 33 is configured such that the diameter of the input gear 331 is smaller than the diameter of the driven gear 332.

[0046] Furthermore, although the lower end 331a of the transmission gear 33 has been described as the lower end of the input gear 331, the present invention is not limited to such a case, and the lower end of the driven gear 332 may be configured as the lower end 331a of the transmission gear 33. When configured in this way, the liquid level 5a of the lubricating oil 5 is provided so as to be located above the lower end of the driven gear 332, and the driven gear 332 is configured to be able to scoop up the lubricating oil 5.

[0047] Also, although a part of the input shaft 32 protrudes from the transmission case 31 and the output shaft 34 is entirely provided within the transmission case 31 has been described, it is also possible to configure such that a part of the output shaft 34 protrudes from the transmission case 31. When configured in this way, the bulging portion 62 can be configured to bulge rearward (the side where the output shaft 34 protrudes) from the transmission case 31.

[0048] Furthermore, although the case where the bulging portion 62 bulges only to either the front side or the rear side of the transmission case 31 has been described, the configuration is not limited to this, and it is also possible to configure it to bulge to both the front side and the rear side of the transmission case 31. Note that when the bulging portion 62 bulges to both the front side and the rear side of the transmission case 31, a part of the input shaft 32 and the output shaft 34 are also configured to protrude back and forth from the transmission case 31.

[0049] Also, although the case where the inner bottom surface 62a of the bulging portion 62 is positioned below the lower end 331a of the transmission gear 33 and the upper surface 62b is positioned above the lower end 331a of the transmission gear 33 has been described, the configuration is not limited to this. For example, the upper surface 62b inside the bulging portion 62 can be positioned below the lower end 331a of the transmission gear 33, or the inner bottom surface 62a of the bulging portion 62 can be positioned above the lower end 331a of the transmission gear 33.

[0050] Furthermore, although the case where the oil filling port 6211 is provided in the upper wall portion 621 has been described, the configuration is not limited to this, and it is also possible to configure the oil filling port 6211 to be provided at a position other than the upper wall portion 621.

[0051] Also, although the case where the input shaft 32 includes the torque limiter 3212 has been described, it is also possible to configure it not to include the torque limiter 3212.

[0052] Furthermore, although the case where the bulging portion 62 protrudes from the transmission case 31 by a smaller amount than the input shaft 32 has been described, it is also possible to configure it to protrude by a larger amount than the input shaft 32.

[0053] Also, although the case where the entire front region 31F is configured as the gear chamber main body 61 has been described, a part of the space in the front region 31F can also be configured as the gear chamber main body 61.

[0054] Furthermore, although the case where the inner bottom surface 62a inside the bulging portion 62 is located below the inner bottom surface 61a inside the gear chamber main body 61 has been described, the inner bottom surface 62a inside the bulging portion 62 may be located above the inner bottom surface 61a inside the gear chamber main body 61, or the inner bottom surface 62a inside the bulging portion 62 and the inner bottom surface 61a inside the gear chamber main body 61 may be at the same height.

[0055] Also, although the case where the bulging portion 62 is integrally formed with the front cover portion 312 of the transmission case 31 has been described, it can also be configured as a separate body.

[0056] Furthermore, although the case where the compression case 21 and the transmission case 31 are integrated has been described, they can also be configured as separate cases.

[0057] Also, although the case where the compressor 2 includes a pair of compression rotors 22 has been described, the present invention is not limited to such a configuration, and the compressor may be any compressor that compresses air by the rotational movement of the compression rotor 22. For example, it can also be configured to compress air by the rotation of a single-axis compression rotor, or a compression rotor without tooth portions 222 on the outer peripheral surface can be adopted.

[0058] Furthermore, in the above embodiment, as an example of the compressor, the screw compressor 1 has been described, but the present invention can also be applied to compressors other than the screw compressor 1.

Explanation of Reference Numerals

[0059] 1…Screw compressor, 11…Overall partition wall, 2…Compressor, 21…Compression case, 22…Compression rotor, 221…Base, 222…Tooth part, 23…Compression shaft part, 231…Compression shaft body, 232…Synchronization gear, 3…Transmission, 31…Transmission case, 311…Case main body part, 312…Front cover part, 313…Transmission partition part, 32…Input shaft, 321…Power connection part, 3211…Connection main body part, 3212…Torque limiter, 322…Input gear connection part, 33…Transmission gear, 331…Input gear, 332…Driven gear, 34…Output shaft, 4…Pipe part, 41…Suction part, 42…Discharge part, 5…Lubricating oil, 5a…Liquid level, 6…Gear chamber, 61…Gear chamber main body, 62…Bulging part, 62S…Internal space, 621…Upper wall part, 6211…Oil supply port, 622…Lower wall part, 623…Side wall part, 624…Front wall part

Claims

1. A compressor that compresses and discharges air, and a transmission that supplies power to the compressor, The compressor includes: A rotating compression rotor, A compression case that houses the compression rotor, The transmission includes: An output shaft that supplies a rotational force to the compression rotor, An input shaft that supplies a rotational force to the output shaft, A transmission gear that connects the input shaft and the output shaft and transmits the rotational force of the input shaft to the output shaft while changing the speed, A gear chamber that houses the transmission gear and the lubricating oil supplied to the transmission gear, A transmission case in which a part of the gear chamber, at least a part of the input shaft, and at least a part of the output shaft are provided inside, At least one of the input shaft and the output shaft has a part protruding outward from the transmission case, The gear chamber includes a bulging portion capable of housing the lubricating oil inside, The bulging portion: Bulges from the transmission case toward the side where at least one of the input shaft and the output shaft protrudes, Is provided side by side with at least one of the input shaft and the output shaft, and Includes an upper wall portion that defines the upper end of the internal space of the bulging portion, The bottom surface inside the bulging portion is configured such that the side closer to the transmission gear is positioned lower than the side farther from the transmission gear, On the upper wall portion, an oil supply port for supplying the lubricating oil is formed above the bottom surface. A compressor.

2. The gear chamber includes a gear chamber main body that houses the transmission gear, The internal space of the bulging portion is provided in communication with the internal space of the gear chamber main body, The compressor according to claim 1, wherein the bottom surface inside the bulging portion is provided at a height below the bottom surface inside the gear chamber main body.

3. The bulging portion is provided such that the upper surface inside is positioned above the lower end of the transmission gear, The compressor according to claim 1 or 2, wherein the lubricating oil is filled such that the liquid level is above the lower end of the transmission gear and below the upper surface inside the bulging portion.

4. The compressor according to any one of claims 1 to 3, wherein the bulging portion is provided such that the bottom surface inside is positioned below the lower end of the transmission gear.

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