Fluid machine

Abstract

To actualize good lubrication of at least one of a motor chamber side seal member and an operation chamber side seal member.SOLUTION: A fluid machine 10 includes at least one of a third oil supply passage 56 formed penetrating through an end wall 13a of a gear housing 13 at its gravity-direction lower side further than a motor side recessed part and opened to a motor side through-hole 17 for supplying compressed oil to a motor chamber side seal member 31 with the rotation of a power transmission part 40, and a fourth oil supply passage 57 formed penetrating through an end wall 14a of a rotor housing 14 at its gravity-direction lower side further than an operation part side recessed part and opened to each of a pair of operation part side through-holes 19 for supplying compressed oil to an operation chamber side seal member 32 with the rotation of the power transmission part 40.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a fluid machine. [Background technology]

[0002] Conventionally, there has been known a fluid machine comprising a housing, a drive shaft, a driven shaft, a motor, a power transmission unit, and an actuating unit. The drive shaft and the driven shaft are each supported by a bearing in the housing and are arranged parallel to each other. The motor rotates the drive shaft. The power transmission unit rotates the drive shaft and the driven shaft synchronously. The actuating unit draws in and discharges fluid via the drive shaft and the driven shaft.

[0003] The housing is formed with a motor chamber, an operating chamber, and a power transmission chamber. The motor chamber accommodates the motor. The operating chamber accommodates the operating part. The power transmission chamber accommodates the power transmission part and oil that lubricates the power transmission part. The motor chamber, power transmission chamber, and operating chamber are arranged in this order. The housing has a first partition wall and a second partition wall. The first partition wall separates the motor chamber from the power transmission chamber. The second partition wall separates the power transmission chamber from the operating chamber.

[0004] The first partition wall has a motor-side through-hole through which the drive shaft is inserted. A motor-side seal member is provided in the motor-side through-hole to seal between the power transmission chamber and the motor chamber. The second partition wall has a pair of actuating unit-side through-holes. A drive shaft and a driven shaft are inserted into each of the actuating unit-side through-holes. Each of the pair of actuating unit-side through-holes has a seal member provided in the actuating chamber to seal between the power transmission chamber and the actuating chamber.

[0005] Also, for example, as in Patent Document 1, the first partition wall may be formed with a motor-side recess and a first oil supply passage, and the second partition wall may be formed with an actuating portion-side recess and a second oil supply passage.

[0006] The motor-side recess is located above the motor-side through-hole in the direction of gravity. Oil stirred by the rotation of the power transmission part accumulates in the motor-side recess. The first oil supply passage opens into the motor-side through-hole. The first oil supply passage supplies the oil accumulated in the motor-side recess to the motor-chamber-side seal member. This ensures good lubrication of the motor-chamber-side seal member by the oil supplied from the motor-side recess to the motor-chamber-side seal member via the first oil supply passage.

[0007] The actuation unit-side recess is located above the pair of actuation unit-side through holes in the direction of gravity. Oil stirred by the rotation of the power transmission unit accumulates in the actuation unit-side recess. The second oil supply passage opens to each of the pair of actuation unit-side through holes. The second oil supply passage supplies the oil accumulated in the actuation unit-side recess to the actuation chamber-side seal member. This improves lubrication of the actuation chamber-side seal member by the oil supplied from the actuation unit-side recess to the actuation chamber-side seal member via the second oil supply passage. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent Publication No. 2021-21333 Summary of the Invention [Problem to be solved by the invention]

[0009] In such a fluid machine, for example, if the attitude of the fluid machine is tilted relative to the axial direction of the drive shaft, the flow of oil stirred by the rotation of the power transmission unit into the motor-side recess and the actuation-unit-side recess may become unstable, which may make it difficult to adequately lubricate the motor-chamber-side seal member and the actuation-chamber-side seal member with oil. [Means for solving the problem]

[0010] A fluid machine that solves the above-mentioned problems includes a housing, a drive shaft and a driven shaft that are each supported by a bearing on the housing and are arranged parallel to each other, a motor that rotates the drive shaft, a power transmission unit that rotates the drive shaft and the driven shaft synchronously, and an operating unit that sucks in and discharges fluid by the drive shaft and the driven shaft, wherein the housing is formed with a motor chamber that accommodates the motor, an operating chamber that accommodates the operating unit, and a power transmission chamber that accommodates the power transmission unit and oil that lubricates the power transmission unit, The housing has a first partition wall separating the motor chamber and the power transmission chamber, and a second partition wall separating the power transmission chamber and the working chamber, the first partition wall having a motor-side through-hole through which the drive shaft is inserted, and a motor-side recess provided above the motor-side through-hole in the direction of gravity and configured to collect oil stirred by rotation of the power transmission part, and the second partition wall having a pair of actuating part-side through-holes through which the drive shaft and the driven shaft are inserted, respectively, and a motor-side recess provided above the pair of actuating part-side through-holes in the direction of gravity and configured to collect oil stirred by rotation of the power transmission part. and an actuation part side recess in which oil stirred by the rotation of the power transmission part is accumulated, the motor side through hole is provided with a motor chamber side seal member that seals the power transmission chamber and the motor chamber, and the pair of actuation part side through holes is provided with an actuation chamber side seal member that seals the power transmission chamber and the actuation chamber, the first partition wall is formed with a first oil supply passage that opens into the motor side through hole and supplies oil accumulated in the motor side recess to the motor chamber side seal member, and the second partition wall is formed with a first oil supply passage that opens into the motor side through hole and supplies oil accumulated in the motor side recess to the motor chamber side seal member a second oil supply passage formed therethrough that opens into each of the pair of actuating unit-side through holes and that supplies oil accumulated in the actuating unit-side recesses to the actuating chamber-side seal member, wherein a third oil supply passage formed therethrough that opens into the first partition wall lower than the motor-side recesses in the direction of gravity and that opens into the motor-side through hole and that supplies oil compressed as the power transmission unit rotates to the motor chamber-side seal member, and a fourth oil supply passage formed therethrough that opens into each of the pair of actuating unit-side through holes and that opens into each of the pair of actuating unit-side recesses,At least one fourth oil supply passage is provided, which supplies oil compressed in accordance with the rotation of the power transmission part to the working chamber side seal member.

[0011] For example, if the fluid machine is tilted relative to the axial direction of the drive shaft, the flow of oil stirred by the rotation of the power transmission unit into the motor-side recess and the actuation-unit-side recess may become unstable. Even in such a case, the oil compressed by the rotation of the power transmission unit is efficiently supplied to at least one of the third oil supply passage and the fourth oil supply passage. This ensures good lubrication of at least one of the motor-chamber-side seal member and the actuation-chamber-side seal member.

[0012] In the above fluid machine, the power transmission unit has a drive gear fixed to the drive shaft and a driven gear fixed to the driven shaft, and forms a compression region in which the teeth of the drive gear and the driven gear come into contact with each other as they rotate, and the spacing between the tooth tips and tooth bottoms becomes narrower, and an expansion region in which the teeth of the drive gear and the driven gear come into contact with each other as they rotate, and the spacing between the tooth tips and tooth bottoms becomes wider, and the first partition wall may be provided with a motor-side convex portion that is convex to face the boundary between the compression region and the expansion region and that guides oil compressed and ejected in the compression region to the third oil supply passage.

[0013] This allows the oil compressed in the compression region to be guided to the third oil supply passage by the motor-side protrusion, which allows the oil compressed as the power transmission unit rotates to be more efficiently supplied to the third oil supply passage, thereby further improving the lubrication of the motor-chamber seal member.

[0014] In the above fluid machine, the first partition wall may be provided with a motor-side upper convex portion that is convex in the direction of gravity above the motor-side convex portion and faces the compression region, and that guides oil that is compressed and ejected in the compression region to the third oil supply passage.

[0015] This allows the oil compressed and ejected in the compression region to be guided to the third oil supply passage by the motor-side upper convex portion, which allows the oil compressed as the power transmission unit rotates to be more efficiently supplied to the third oil supply passage, thereby further improving lubrication of the motor-chamber-side seal member.

[0016] In the above fluid machine, the first partition wall may be provided with a motor side lateral convex portion that is protruded between the motor side convex portion and the motor side upper convex portion and that guides the oil compressed and ejected in the compression region to the third oil supply passage.

[0017] This allows the oil compressed and ejected in the compression region to be guided to the third oil supply passage by the motor-side lateral protrusion, which allows the oil compressed as the power transmission unit rotates to be more efficiently supplied to the third oil supply passage, thereby further improving lubrication of the motor-chamber-side seal member.

[0018] In the above fluid machine, the third oil supply passage may open closer to the motor-side convex portion than the motor-side upper convex portion. With this configuration, the third oil supply passage opens closer to the motor-side convex portion than the motor-side upper convex portion, which makes it easier for oil flowing downward in the direction of gravity along the motor-side upper convex portion and the motor-side lateral convex portion to be guided to the third oil supply passage. As a result, oil compressed as the power transmission part rotates is more efficiently supplied to the third oil supply passage, further improving lubrication of the motor-chamber seal member.

[0019] In the above fluid machine, the power transmission unit has a drive gear fixed to the drive shaft and a driven gear fixed to the driven shaft, and forms a compression region in which the teeth of the drive gear and the driven gear come into contact with each other as they rotate, and the spacing between the tooth tips and tooth bottoms becomes narrower, and an expansion region in which the teeth of the drive gear and the driven gear come into contact with each other as they rotate, and the spacing between the tooth tips and tooth bottoms becomes wider, and the second partition wall may be provided with an actuating unit side convex portion that is convex to face the boundary between the compression region and the expansion region and that guides oil compressed and ejected in the compression region to the fourth oil supply passage.

[0020] With this configuration, the oil compressed and ejected in the compression region is guided to the fourth oil supply passage by the actuation-part-side convex portion, which allows the oil compressed as the power transmission part rotates to be more efficiently supplied to the fourth oil supply passage, thereby further improving the lubrication of the actuation-part chamber seal member.

[0021] In the above fluid machine, the second partition wall may be provided with an actuating unit side upper convex portion that is convex in the direction of gravity above the actuating unit side convex portion and faces the compression region, and that guides oil compressed and ejected in the compression region to the fourth oil supply passage.

[0022] With this configuration, the oil compressed and ejected in the compression region is guided to the fourth oil supply passage by the actuation-part-side upper convex portion, which allows the oil compressed as the power transmission part rotates to be more efficiently supplied to the fourth oil supply passage, thereby further improving the lubrication of the actuation-part chamber seal member.

[0023] In the above fluid machine, the second partition wall may be provided with an actuating unit side convex portion that is protruded between the actuating unit side convex portion and the actuating unit side upper convex portion and that guides the oil compressed and ejected in the compression region to the fourth oil supply passage.

[0024] With this, the oil compressed and ejected in the compression region is guided to the fourth oil supply passage by the actuation-chamber-side lateral protrusion, so that the oil compressed as the power transmission part rotates is more efficiently supplied to the fourth oil supply passage, thereby further improving the lubrication of the actuation-chamber-side seal member.

[0025] In the above fluid machine, the fourth oil supply passage may be open closer to the actuating portion-side convex portion than the actuating portion-side upper convex portion. With this, because the fourth oil supply passage opens closer to the actuating-chamber-side convex portion than to the actuating-unit-side upper convex portion, oil flowing downward in the direction of gravity along the actuating-unit-side upper convex portion and the actuating-unit-side lateral convex portion is more easily guided to the fourth oil supply passage. Therefore, oil compressed as the power transmission portion rotates is more efficiently supplied to the fourth oil supply passage, thereby further improving lubrication of the actuating-chamber-side seal member. [Effects of the Invention]

[0026] According to this invention, at least one of the motor chamber side seal member and the working chamber side seal member can be well lubricated. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a cross-sectional view showing a fluid machine according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 4 is a front view of the gear housing. [Figure 5] FIG. 5 is a front view of the rotor housing. [Figure 6] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. [Figure 9] FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. [Figure 10] FIG. 10 is an enlarged cross-sectional view of a part of the fluid machine. [Figure 11] FIG. 11 is a perspective view of the gear housing. [Figure 12] FIG. 12 is a diagram showing the relationship between the drive gear, the driven gear, and the third oil supply passage. [Figure 13] FIG. 13 is a perspective view of the rotor housing. [Figure 14] FIG. 14 is a diagram showing the relationship between the drive gear, the driven gear, and the fourth oil supply passage. DETAILED DESCRIPTION OF THE INVENTION

[0028] An embodiment of a fluid machine will be described below with reference to Figs. 1 to 14. The fluid machine of this embodiment is a Roots pump. The fluid machine is installed in a fuel cell vehicle. The fluid machine is used as a pump that supplies hydrogen to a fuel cell that generates electricity by chemically reacting hydrogen, which is a fuel gas as a fluid, with oxygen contained in air, which is an oxidant gas.

[0029] <Fluid Machinery Overview> As shown in Fig. 1, the fluid machine 10 includes a housing 11. The housing 11 is cylindrical. The housing 11 is made of metal. For example, the housing 11 is made of aluminum. The housing 11 includes a motor housing 12, a gear housing 13, a rotor housing 14, and a cover member 15.

[0030] The motor housing 12 has a plate-shaped end wall 12a and a cylindrical peripheral wall 12b. The peripheral wall 12b extends from the outer periphery of the end wall 12a. The motor housing 12 has a cylindrical boss 16. The boss 16 protrudes from the center of the inner surface 12e of the end wall 12a, which faces the peripheral wall 12b. The axis of the boss 16 coincides with the axis of the peripheral wall 12b.

[0031] The gear housing 13 has a plate-shaped end wall 13a and a cylindrical peripheral wall 13b. The peripheral wall 13b extends from the outer periphery of the end wall 13a. The gear housing 13 is connected to an end portion of the motor housing 12 that is located on the opening side of the peripheral wall 12b. The end wall 13a of the gear housing 13 closes the opening of the peripheral wall 12b of the motor housing 12.

[0032] The gear housing 13 has a motor-side through-hole 17. The motor-side through-hole 17 is circular. The motor-side through-hole 17 penetrates the end wall 13a in the thickness direction of the end wall 13a. Therefore, the motor-side through-hole 17 is formed in the end wall 13a of the gear housing 13. The axis of the motor-side through-hole 17 coincides with the axis of the boss portion 16. The gear housing 13 has a recess 18. The recess 18 is formed in the inner surface 13e of the end wall 13a, which is located on the peripheral wall 13b side. The recess 18 is circular. The axis of the recess 18 extends parallel to the axis of the motor-side through-hole 17.

[0033] The rotor housing 14 has a plate-shaped end wall 14a and a cylindrical peripheral wall 14b. The peripheral wall 14b extends from the outer periphery of the end wall 14a. The rotor housing 14 is connected to an end portion of the peripheral wall 13b of the gear housing 13 that is located on the opening side. The end wall 14a of the rotor housing 14 closes the opening of the peripheral wall 13b of the gear housing 13. The axial direction of the peripheral wall 12b of the motor housing 12, the axial direction of the peripheral wall 13b of the gear housing 13, and the axial direction of the peripheral wall 14b of the rotor housing 14 are all aligned.

[0034] The rotor housing 14 has a pair of actuating unit-side through holes 19. Each actuating unit-side through hole 19 is circular. Each actuating unit-side through hole 19 penetrates the end wall 14a in the thickness direction of the end wall 14a. Therefore, a pair of actuating unit-side through holes 19 is formed in the end wall 14a of the rotor housing 14. The axes of the pair of actuating unit-side through holes 19 extend parallel to each other. The axis of one of the pair of actuating unit-side through holes 19 coincides with the axis of the motor-side through hole 17. The axis of the other of the pair of actuating unit-side through holes 19 coincides with the axis of the recess 18.

[0035] The cover member 15 is plate-shaped and is connected to an end portion of the peripheral wall 14b of the rotor housing 14 that is located on the opening side. The cover member 15 faces the end wall 14a and closes the opening of the peripheral wall 14b.

[0036] The housing 11 defines a motor chamber 21, a power transmission chamber 22, and an operating chamber 23. The motor chamber 21 is defined by an end wall 12a of the motor housing 12, a peripheral wall 12b of the motor housing 12, and an end wall 13a of the gear housing 13. The power transmission chamber 22 is defined by an end wall 13a of the gear housing 13, a peripheral wall 13b of the gear housing 13, and an end wall 14a of the rotor housing 14. The operating chamber 23 is defined by an end wall 14a of the rotor housing 14, a peripheral wall 14b of the rotor housing 14, and a cover member 15.

[0037] The end wall 13a of the gear housing 13 is a first partition wall that separates the motor chamber 21 and the power transmission chamber 22. The end wall 14a of the rotor housing 14 is a second partition wall that separates the power transmission chamber 22 and the working chamber 23. Therefore, the housing 11 has the end wall 13a of the gear housing 13 as a first partition wall that separates the motor chamber 21 and the power transmission chamber 22, and the end wall 14a of the rotor housing 14 as a second partition wall that separates the power transmission chamber 22 and the working chamber 23. The motor chamber 21, the power transmission chamber 22, and the working chamber 23 are arranged in this order.

[0038] The fluid machine 10 includes a drive shaft 24 and a driven shaft 25. A first end of the drive shaft 24 is disposed inside the boss portion 16. A second end of the drive shaft 24 passes through the motor chamber 21, the motor-side through-hole 17, the power transmission chamber 22, and one of the pair of actuating-part-side through-holes 19, protruding into the working chamber 23. In this manner, the drive shaft 24 is inserted through the motor-side through-hole 17. A bearing 26 is provided between the drive shaft 24 and the inner circumferential surface of the boss portion 16. The drive shaft 24 is rotatably supported by the boss portion 16 via the bearing 26. A bearing 27 is provided between the drive shaft 24 and the inner circumferential surface of the motor-side through-hole 17. The drive shaft 24 is rotatably supported by the end wall 13a of the gear housing 13 via the bearing 27. A bearing 28 is provided between the drive shaft 24 and the inner circumferential surface of one of the pair of actuating-part-side through-holes 19. The drive shaft 24 is rotatably supported on the end wall 14 a of the rotor housing 14 via a bearing 28 .

[0039] A first end of the driven shaft 25 is disposed inside the recess 18. A second end of the driven shaft 25 passes through the power transmission chamber 22 and the other of the pair of actuating unit-side through holes 19 and protrudes into the actuating chamber 23. In this manner, the drive shaft 24 and the driven shaft 25 are respectively inserted through the pair of actuating unit-side through holes 19. A bearing 29 is provided between the driven shaft 25 and the inner circumferential surface of the recess 18. The driven shaft 25 is rotatably supported by the end wall 13a of the gear housing 13 via the bearing 29. A bearing 30 is provided between the driven shaft 25 and the other of the pair of actuating unit-side through holes 19. The driven shaft 25 is rotatably supported by the end wall 14a of the rotor housing 14 via the bearing 30.

[0040] In this manner, the drive shaft 24 and the driven shaft 25 are supported by bearings 26, 27, 28, 29, and 30, respectively, relative to the housing 11. The axis L1 of the drive shaft 24 and the axis L2 of the driven shaft 25 extend parallel to each other. Therefore, the drive shaft 24 and the driven shaft 25 are disposed parallel to each other. The drive shaft 24 and the driven shaft 25 are rotatably supported by the housing 11. The axial direction of the drive shaft 24 and the axial direction of the driven shaft 25 coincide with the axial direction of each of the peripheral walls 12b, 13b, and 14b.

[0041] The fluid machine 10 is provided with a motor chamber-side seal member 31. The motor chamber-side seal member 31 is disposed inside the motor-side through-hole 17, closer to the motor chamber 21 than the bearing 27. Therefore, the motor chamber-side seal member 31 is provided in the motor-side through-hole 17. The motor chamber-side seal member 31 seals between the drive shaft 24 and the inner circumferential surface of the motor-side through-hole 17. In this way, the motor chamber-side seal member 31 seals between the power transmission chamber 22 and the motor chamber 21.

[0042] The fluid machine 10 includes a pair of working chamber-side seal members 32. One of the pair of working chamber-side seal members 32 is disposed inside one of the pair of working unit-side through holes 19, closer to the working chamber 23 than the bearing 28. One of the pair of working chamber-side seal members 32 seals between the drive shaft 24 and the inner circumferential surface of one of the pair of working unit-side through holes 19. The other of the pair of working chamber-side seal members 32 is disposed inside the other of the pair of working unit-side through holes 19, closer to the working chamber 23 than the bearing 30. The other of the pair of working chamber-side seal members 32 seals between the driven shaft 25 and the inner circumferential surface of the other of the pair of working unit-side through holes 19. Each working chamber-side seal member 32 seals between the power transmission chamber 22 and the working chamber 23. In this way, a working chamber-side seal member 32 that seals between the power transmission chamber 22 and the working chamber 23 is provided in each of the pair of working unit-side through holes 19.

[0043] The fluid machine 10 includes a motor 34. The motor 34 is housed in the motor chamber 21. Therefore, the motor chamber 21 houses the motor 34. The motor 34 has a motor rotor 35 and a motor stator 36. The motor rotor 35 is cylindrical. The motor rotor 35 is fixed to the drive shaft 24. The motor rotor 35 is configured to be rotatable integrally with the drive shaft 24. The motor stator 36 is cylindrical. The motor stator 36 is fixed to the inner circumferential surface of the peripheral wall 12b of the motor housing 12. The motor stator 36 surrounds the motor rotor 35. The motor stator 36 has a motor coil 37. The motor 34 is driven by supplying power to the motor coil 37. When the motor 34 is driven, the motor rotor 35 rotates integrally with the drive shaft 24. In this way, the motor 34 rotates the drive shaft 24.

[0044] The fluid machine 10 includes a power transmission unit 40. The power transmission unit 40 is accommodated in the power transmission chamber 22. Therefore, the power transmission chamber 22 accommodates the power transmission unit 40. The power transmission unit 40 has a drive gear 41 and a driven gear 42. The drive gear 41 and the driven gear 42 are accommodated in the power transmission chamber 22. Therefore, the power transmission chamber 22 accommodates the drive gear 41 and the driven gear 42. The drive gear 41 is disk-shaped. The drive gear 41 is fixed to the drive shaft 24. The driven gear 42 is disk-shaped. The driven gear 42 is fixed to the driven shaft 25. The driven gear 42 meshes with the drive gear 41.

[0045] The drive gear 41 and the driven gear 42 are housed in the power transmission chamber 22 in a state of meshing with each other. The power transmission chamber 22 is filled with oil. The oil contributes to lubricating the drive gear 41 and the driven gear 42 and suppressing temperature increases. The drive gear 41 and the driven gear 42 rotate while immersed in oil, allowing them to rotate at high speeds without seizing or wearing out. In this way, the power transmission chamber 22 contains oil that lubricates the power transmission unit 40.

[0046] The fluid machine 10 includes an actuating unit 43. The actuating unit 43 is housed in the actuating chamber 23. Therefore, the actuating chamber 23 houses the actuating unit 43. The actuating unit 43 has a drive rotor 44 and a driven rotor 45. The drive rotor 44 and the driven rotor 45 are housed in the actuating chamber 23. Therefore, the actuating chamber 23 houses the drive rotor 44 and the driven rotor 45.

[0047] The drive rotor 44 is provided at a second end of the drive shaft 24. The drive rotor 44 rotates integrally with the drive shaft 24. The driven rotor 45 is provided at a second end of the driven shaft 25. The driven rotor 45 rotates integrally with the driven shaft 25. The driven rotor 45 meshes with the drive rotor 44. Therefore, the drive rotor 44 and the driven rotor 45 are housed in the working chamber 23 in a meshed state.

[0048] 2, the drive rotor 44 and the driven rotor 45 are formed in a bilobal (gourd-shaped) cross section perpendicular to the axial direction of the drive shaft 24 and the driven shaft 25. The drive rotor 44 has two lobes 44a and a valley tooth 44b formed between the two lobes 44a. The driven rotor 45 has two lobes 45a and a valley tooth 45b formed between the two lobes 45a.

[0049] The drive rotor 44 and the driven rotor 45 are capable of rotating within the working chamber 23 by repeatedly meshing the lobe teeth 44a of the drive rotor 44 with the valley teeth 45b of the driven rotor 45 and meshing the valley teeth 44b of the drive rotor 44 with the lobe teeth 45a of the driven rotor 45. The drive rotor 44 rotates in the direction of arrow R1 shown in Fig. 2, and the driven rotor 45 rotates in the direction of arrow R2 shown in Fig. 2.

[0050] An intake port 46 is formed in a lower portion of the peripheral wall 14b of the rotor housing 14 in the direction of gravity. Furthermore, an exhaust port 47 is formed in an upper portion of the peripheral wall 14b of the rotor housing 14 in the direction of gravity. The intake port 46 and the exhaust port 47 are formed in opposing positions on the peripheral wall 14b of the rotor housing 14, sandwiching the working chamber 23 therebetween. The intake port 46 and the exhaust port 47 communicate between the working chamber 23 and the outside of the housing 11.

[0051] As shown in FIGS. 1 and 2 , when the drive shaft 24 rotates due to the drive of the motor 34, the driven shaft 25 rotates in the opposite direction relative to the drive shaft 24 via the gear connection between the meshed drive gear 41 and driven gear 42. In this manner, the power transmission unit 40 synchronously rotates the drive shaft 24 and the driven shaft 25. Then, as the drive shaft 24 and the driven shaft 25 rotate in the opposite directions, the drive rotor 44 and the driven rotor 45 rotate in the opposite directions while meshed with each other. In this manner, the drive rotor 44 and the driven rotor 45 rotate synchronously. When the drive rotor 44 and the driven rotor 45 rotate synchronously, hydrogen is drawn into the working chamber 23 through the intake port 46 and is discharged from the working chamber 23 through the discharge port 47. In this manner, the working unit 43 draws in and discharges hydrogen as a fluid via the drive shaft 24 and the driven shaft 25.

[0052] <Motor side recess> 3 and 4, a motor-side recess 51 is formed in the end wall 13a of the gear housing 13. The motor-side recess 51 is formed on the inner surface 13e of the end wall 13a of the gear housing 13. As shown in FIG. 4, the motor-side recess 51 is provided above the motor-side through-hole 17 in the direction of gravity. The motor-side recess 51 is formed on the inner surface 13e of the end wall 13a of the gear housing 13 in a position above the direction of gravity of a plane S that includes both the axis L1 of the drive shaft 24 and the axis L2 of the driven shaft 25.

[0053] The motor-side recess 51 has a first inner surface 51a. The first inner surface 51a extends in the axial direction of the drive shaft 24 and the driven shaft 25, continuing to a surface 131c that is higher in the direction of gravity than a plane S on an inner circumferential surface 13c of a peripheral wall 13b of the gear housing 13, which forms the inner circumferential surface of the power transmission chamber 22. When the motor-side recess 51 is viewed in the axial direction of the drive shaft 24 and the driven shaft 25, the first inner surface 51a extends along the surface 131c that is higher in the direction of gravity than the plane S on the inner circumferential surface 13c of the peripheral wall 13b of the gear housing 13. When the motor-side recess 51 is viewed in the axial direction of the drive shaft 24 and the driven shaft 25, a first edge E1 of the first inner surface 51a is located higher in the direction of gravity than the recess 18. When the motor-side recess 51 is viewed from the axial direction of the drive shaft 24 and the driven shaft 25, the second edge E2 of the first inner surface 51a is located above the motor-side through-hole 17 in the direction of gravity.

[0054] The motor-side recess 51 has a second inner surface 51b. The second inner surface 51b is continuous with the first edge E1 of the first inner surface 51a and extends in an arc-like curve toward the recess 18 as it moves away from the first edge E1. When the motor-side recess 51 is viewed from the axial direction of the drive shaft 24 and the driven shaft 25, the second inner surface 51b is a curved surface that convexly extends in a direction away from the second edge E2 of the first inner surface 51a.

[0055] The motor-side recess 51 has a third inner surface 51c. The third inner surface 51c is continuous with the edge of the second inner surface 51b on the side opposite to the first inner surface 51a, and extends toward the motor-side through-hole 17 as it moves away from the second inner surface 51b. The third inner surface 51c is a curved surface that curves in an arc shape and extends along the inner circumferential surface of the recess 18.

[0056] The motor-side recess 51 has a fourth inner surface 51d. The fourth inner surface 51d is continuous with the second edge E2 of the first inner surface 51a and extends in an arc-like curve toward the motor-side through-hole 17 as it moves away from the second edge E2. When the motor-side recess 51 is viewed from the axial direction of the drive shaft 24 and the driven shaft 25, the fourth inner surface 51d is a curved surface that convexly extends in a direction away from the first edge E1 of the first inner surface 51a.

[0057] The motor-side recess 51 has a fifth inner surface 51e. The fifth inner surface 51e is continuous with the edge of the fourth inner surface 51d opposite to the first inner surface 51a, and extends toward the recess 18 as it moves away from the fourth inner surface 51d. The fifth inner surface 51e is a curved surface that curves in an arc shape and extends along the inner circumferential surface of the motor-side through-hole 17.

[0058] The motor-side recess 51 has a sixth inner surface 51f. The sixth inner surface 51f connects the edge of the third inner surface 51c opposite the second inner surface 51b to the edge of the fifth inner surface 51e opposite the fourth inner surface 51d. The sixth inner surface 51f is a curved surface that convexly extends away from the first inner surface 51a. When the motor-side recess 51 is viewed from the axial direction of the drive shaft 24 and the driven shaft 25, the apex of the sixth inner surface 51f is the lowest point of the motor-side recess 51 in the direction of gravity.

[0059] <Recessed portion on the operating part side> 3 and 5, an actuating portion-side recess 52 is formed in the end wall 14a of the rotor housing 14. The actuating portion-side recess 52 is formed on the outer surface 14e of the end wall 14a of the rotor housing 14. As shown in Fig. 3, the actuating portion-side recess 52 is formed on the outer surface 14e of the end wall 14a of the rotor housing 14 at a position facing the motor-side recess 51 in the axial direction of the drive shaft 24 and the driven shaft 25.

[0060] 5, the actuating portion-side recess 52 is provided above the pair of actuating portion-side through-holes 19 in the direction of gravity. The actuating portion-side recess 52 is formed on the outer surface 14e of the end wall 14a of the rotor housing 14, at a location above the direction of gravity of a plane S that includes both the axis L1 of the drive shaft 24 and the axis L2 of the driven shaft 25.

[0061] The actuating unit-side recess 52 has a first inner surface 52a. The first inner surface 52a extends in the axial direction of the drive shaft 24 and the driven shaft 25, continuing to a surface 131c that is higher in the direction of gravity than a plane S on the inner circumferential surface 13c (indicated by a two-dot chain line in FIG. 5 ) of the peripheral wall 13b of the gear housing 13. When the actuating unit-side recess 52 is viewed in the axial direction of the drive shaft 24 and the driven shaft 25, the first inner surface 52a extends along the surface 131c that is higher in the direction of gravity than the plane S on the inner circumferential surface 13c of the peripheral wall 13b of the gear housing 13. When the actuating unit-side recess 52 is viewed in the axial direction of the drive shaft 24 and the driven shaft 25, a first edge E11 of the first inner surface 52a is located higher in the direction of gravity than one of the pair of actuating unit-side through-holes 19. When the actuating portion side recess 52 is viewed from the axial direction of the drive shaft 24 and the driven shaft 25, the second edge E12 of the first inner surface 52a is located above the other of the pair of actuating portion side through holes 19 in the direction of gravity.

[0062] The actuating unit-side recess 52 has a second inner surface 52b. The second inner surface 52b is continuous with the first edge E11 of the first inner surface 52a and extends in an arc-like curve toward one of the pair of actuating unit-side through-holes 19 as it moves away from the first edge E11. When the actuating unit-side recess 52 is viewed from the axial direction of the drive shaft 24 and the driven shaft 25, the second inner surface 52b is a curved surface that convexly extends in a direction away from the second edge E12 of the first inner surface 52a.

[0063] The actuating unit-side recess 52 has a third inner surface 52c. The third inner surface 52c is continuous with the edge of the second inner surface 52b opposite to the first inner surface 52a, and extends toward the other of the pair of actuating unit-side through holes 19 as it moves away from the second inner surface 52b. The third inner surface 52c is an arc-shaped curved surface that extends along the inner circumferential surface of one of the pair of actuating unit-side through holes 19.

[0064] The actuating unit-side recess 52 has a fourth inner surface 52d. The fourth inner surface 52d is continuous with the second edge E12 of the first inner surface 52a and extends in an arc-like curve toward the other of the pair of actuating unit-side through-holes 19 as it moves away from the second edge E12. When the actuating unit-side recess 52 is viewed from the axial direction of the drive shaft 24 and the driven shaft 25, the fourth inner surface 52d is a curved surface that convexly extends in a direction away from the first edge E11 of the first inner surface 52a.

[0065] The actuation unit-side recess 52 has a fifth inner surface 52e. The fifth inner surface 52e is continuous with the edge of the fourth inner surface 52d opposite to the first inner surface 52a, and extends toward one of the pair of actuation unit-side through holes 19 as it moves away from the fourth inner surface 52d. The fifth inner surface 52e is an arc-shaped curved surface that extends along the inner circumferential surface of the other of the pair of actuation unit-side through holes 19.

[0066] The actuating unit-side recess 52 has a sixth inner surface 52f. The sixth inner surface 52f connects the edge of the third inner surface 52c opposite the second inner surface 52b to the edge of the fifth inner surface 52e opposite the fourth inner surface 52d. The sixth inner surface 52f is a curved surface that convexly extends away from the first inner surface 52a. When the actuating unit-side recess 52 is viewed from the axial direction of the drive shaft 24 and the driven shaft 25, the apex of the sixth inner surface 52f is the lowest point of the actuating unit-side recess 52 in the direction of gravity.

[0067] <Relationship between the motor-side recess and the actuator-side recess> 6, a sixth inner surface 51f of the motor-side recess 51 and a sixth inner surface 52f of the actuating unit-side recess 52 partially intersect with each other in the axial direction of the drive shaft 24 and the driven shaft 25. The lowest part of the motor-side recess 51 in the direction of gravity and the lowest part of the actuating unit-side recess 52 in the direction of gravity are located closest to the plane S. Furthermore, when viewed from the axial direction of the drive shaft 24 and the driven shaft 25, the lowest part of the motor-side recess 51 and the lowest part of the actuating unit-side recess 52 are located above the meshing part 53 between the drive gear 41 and the driven gear 42 in the direction of gravity.

[0068] In FIG. 6 , the oil sealed in the power transmission chamber 22 is indicated by dotted hatching. The oil sealed in the power transmission chamber 22 is agitated by the rotation of the power transmission unit 40. Specifically, the rotation of the drive gear 41 and the driven gear 42 causes the oil sealed in the power transmission chamber 22 to be scooped up toward the upper side of the power transmission chamber 22 in the direction of gravity through the gap between the drive gear 41 and the peripheral wall 13b and the gap between the driven gear 42 and the peripheral wall 13b. The oil scooped up by the drive gear 41 and the oil scooped up by the driven gear 42 collide with each other above the meshing portion 53 in the direction of gravity within the power transmission chamber 22 and flows into the motor-side recess 51 and the actuating-unit-side recess 52, respectively. As a result, the oil accumulates in the motor-side recess 51 and the actuating-unit-side recess 52. In this manner, the oil agitated by the rotation of the power transmission unit 40 accumulates in the motor-side recess 51. Furthermore, oil stirred by the rotation of the power transmission part 40 accumulates in the actuation part side recess 52.

[0069] <First oil supply passage> As shown in FIG. 7 , a first oil supply passage 54 is formed penetrating the end wall 13a of the gear housing 13. The first oil supply passage 54 supplies oil accumulated in the motor-side recess 51 to the motor-side through-hole 17. A first end of the first oil supply passage 54 opens into the motor-side recess 51. A second end of the first oil supply passage 54 opens into a portion of the motor-side through-hole 17 located between the bearing 27 and the motor-chamber-side seal member 31. The oil accumulated in the motor-side recess 51 is supplied to the motor-side through-hole 17 via the first oil supply passage 54. In this way, the first oil supply passage 54 opens into the motor-side through-hole 17 and supplies the oil accumulated in the motor-side recess 51 to the motor-chamber-side seal member 31. The cross-sectional area of ​​the first oil supply passage 54 is set to a value that allows oil that flows into the motor-side recess 51 to be stored in the motor-side recess 51.

[0070] <Second oil supply passage> As shown in FIGS. 8 and 9 , a pair of second oil supply passages 55 are formed penetrating the end wall 14a of the rotor housing 14. As shown in FIG. 8 , one of the pair of second oil supply passages 55 supplies oil accumulated in the actuating unit-side recesses 52 to one of the pair of actuating unit-side through holes 19. A first end of one of the pair of second oil supply passages 55 opens to the actuating unit-side recesses 52. A second end of one of the pair of second oil supply passages 55 opens to a portion of one of the pair of actuating unit-side through holes 19 that is located between the bearing 28 and one of the pair of actuating-chamber-side seal members 32. The oil accumulated in the actuating unit-side recesses 52 is supplied to one of the pair of actuating unit-side through holes 19 via one of the pair of second oil supply passages 55. In this way, one of the pair of second oil supply passages 55 opens to one of the pair of actuating unit-side through holes 19 and supplies oil accumulated in the actuating unit-side recesses 52 to one of the pair of actuating-chamber-side seal members 32. The cross-sectional area of ​​one of the pair of second oil supply passages 55 is set to a value that allows the oil that has flowed into the actuating portion-side recess 52 to be stored in the actuating portion-side recess 52.

[0071] As shown in FIG. 9 , the other of the pair of second oil supply passages 55 supplies oil accumulated in the actuating unit-side recess 52 to the other of the pair of actuating unit-side through holes 19. A first end of the other of the pair of second oil supply passages 55 opens to the actuating unit-side recess 52. A second end of the other of the pair of second oil supply passages 55 opens to a portion of the other of the pair of actuating unit-side through holes 19 that is located between the bearing 30 and the other of the pair of actuating-chamber-side seal members 32. The oil accumulated in the actuating unit-side recess 52 is supplied to the other of the pair of actuating unit-side through holes 19 via the other of the pair of second oil supply passages 55. In this way, the other of the pair of second oil supply passages 55 opens to the other of the pair of actuating unit-side through holes 19 and supplies oil accumulated in the actuating unit-side recess 52 to the other of the pair of actuating-chamber-side seal members 32. The cross-sectional area of ​​the other of the pair of second oil supply passages 55 is set to a value that allows the oil that has flowed into the actuating part-side recess 52 to be stored in the actuating part-side recess 52. In this way, the second oil supply passage 55 opens to each of the pair of actuating part-side through holes 19, and supplies the oil that has accumulated in the actuating part-side recess 52 to the actuating chamber-side seal member 32.

[0072] <Third oil supply passage> As shown in FIGS. 10 , 11 , and 12 , the fluid machine 10 includes a third oil supply passage 56. As shown in FIG. 11 , the third oil supply passage 56 penetrates the end wall 13 a of the gear housing 13 and is located lower than the motor-side recess 51 in the direction of gravity. A first end of the third oil supply passage 56 opens to a portion of the inner surface 13 e of the end wall 13 a of the gear housing 13, the portion being located between the motor-side through-hole 17 and the recess 18, and also opening to a portion of the inner surface 13 e of the end wall 13 a of the gear housing 13, where the plane S passes. As shown in FIG. 10 , a second end of the third oil supply passage 56 opens to a portion of the motor-side through-hole 17 located between the bearing 27 and the motor-chamber-side seal member 31. Therefore, the third oil supply passage 56 opens to the motor-side through-hole 17. The third oil supply passage 56 supplies oil compressed in accordance with rotation of the power transmission unit 40 to the motor-chamber-side seal member 31.

[0073] <Compression and expansion regions> As shown in FIG. 12 , the power transmission unit 40 has a compression region 60 and an expansion region 61. In the compression region 60, at the meshing portion 53 between the drive gear 41 and the driven gear 42, the teeth 41 a and 42 a come into contact with each other as the drive gear 41 and the driven gear 42 rotate, and the gap between the tooth tips and tooth bottoms narrows. In the expansion region 61, at the meshing portion 53 between the drive gear 41 and the driven gear 42, the teeth 41 a and 42 a come into contact with each other as the drive gear 41 and the driven gear 42 rotate, and the gap between the tooth tips and tooth bottoms widens. Here, the “tooth tips” refer to the tips of the respective teeth 41 a and 42 a. The “tooth bottoms” refer to the portions connecting the adjacent teeth 41 a and 42 a on the drive gear 41 and the driven gear 42, respectively.

[0074] Specifically, in the power transmission unit 40, a plurality of closed spaces 62 are formed by the drive gear 41 and the driven gear 42 between a meshing start position P1 and a meshing end position P2 of the drive gear 41 and the driven gear 42. The compression region 60 is made up of the closed spaces 62 among the plurality of closed spaces 62 whose volume decreases as the drive gear 41 and the driven gear 42 rotate synchronously. On the other hand, the expansion region 61 is made up of the closed spaces 62 among the plurality of closed spaces 62 whose volume increases closer to the meshing end position P2 relative to the compression region 60 as the drive gear 41 and the driven gear 42 rotate synchronously.

[0075] Of the multiple closed spaces 62, the closed space 62 located on the plane S is the closed space 62 with the smallest volume in the compression region 60. Among the multiple closed spaces 62, the closed space 62 located closer to the meshing end position P2 than the plane S is the closed space 62 whose volume increases as the drive gear 41 and the driven gear 42 rotate synchronously. Therefore, the expansion region 61 is composed of the closed spaces 62 located closer to the meshing end position P2 than the plane S. An imaginary plane S10 extends parallel to the plane S and intersects between the closed space 62 located on the plane S and the closed space 62 adjacent to the closed space 62 and located closer to the meshing end position P2, indicating the boundary K1 between the compression region 60 and the expansion region 61.

[0076] <Motor side convex portion, motor side upper convex portion, and motor side convex portion> 11 and 12, the fluid machine 10 includes a motor side cylindrical portion 70. The motor side cylindrical portion 70 protrudes from a portion of the inner surface 13e of the end wall 13a of the gear housing 13 that is located between the motor side through-hole 17 and the recess 18. The motor side cylindrical portion 70 has a rectangular cylindrical shape. When the inner surface 13e of the end wall 13a of the gear housing 13 is viewed from above, the motor side cylindrical portion 70 surrounds the first end of the third oil supply passage 56.

[0077] 12, the wall portion of the motor-side cylindrical portion 70 located on the lower side in the direction of gravity is a motor-side protrusion 71 that protrudes from the inner surface 13e of the end wall 13a of the gear housing 13 so as to face the boundary K1 between the compression region 60 and the expansion region 61. Therefore, the motor-side protrusion 71 is provided on the end wall 13a of the gear housing 13. The motor-side protrusion 71 is flat. The motor-side protrusion 71 extends along an imaginary plane S10.

[0078] The wall portion located on the upper side of the motor-side cylindrical portion 70 in the direction of gravity is a motor-side upper convex portion 72 that is convexly provided so as to face the compression region 60 above the motor-side convex portion 71 on the inner surface 13e of the end wall 13a of the gear housing 13 in the direction of gravity. Therefore, the end wall 13a of the gear housing 13 is provided with the motor-side upper convex portion 72. The motor-side upper convex portion 72 is flat. The motor-side upper convex portion 72 extends along an imaginary plane S10. The motor-side upper convex portion 72 extends parallel to the motor-side convex portion 71. As shown in FIG. 11 , the motor-side upper convex portion 72 is disposed between the motor-side convex portion 71 and the motor-side recess 51 in the direction of gravity. The first end of the third oil supply passage 56 opens closer to the motor-side convex portion 71 than the motor-side upper convex portion 72.

[0079] As shown in FIG. 12 , a pair of walls connecting the motor-side protrusion 71 and the motor-side upper protrusion 72 of the motor-side cylindrical portion 70 are motor-side lateral protrusions 73 that protrude between the motor-side protrusion 71 and the motor-side upper protrusion 72 on the inner surface 13e of the end wall 13a of the gear housing 13. Therefore, the end wall 13a of the gear housing 13 is provided with the motor-side lateral protrusions 73. Each motor-side lateral protrusion 73 is flat. Each motor-side lateral protrusion 73 extends parallel to each other. Each motor-side lateral protrusion 73 extends in a direction perpendicular to the imaginary plane S10.

[0080] The surface of the motor side convex portion 71 facing the motor side upper convex portion 72, the surface of the motor side upper convex portion 72 facing the motor side convex portion 71, and the opposing surfaces of the pair of motor side lateral convex portions 73 form the inner surface of the motor side cylindrical portion 70.

[0081] The surface of the motor-side convex portion 71 that faces the motor-side upper convex portion 72 is protruded so as to face the boundary K1 portion between the compression region 60 and the expansion region 61 on the inner surface 13e of the end wall 13a of the gear housing 13. The surface of the motor-side upper convex portion 72 that faces the motor-side convex portion 71 is protruded so as to face the compression region 60 above the motor-side convex portion 71 on the inner surface 13e of the end wall 13a of the gear housing 13 in the direction of gravity.

[0082] <Fourth oil supply passage> 10, 13, and 14, the fluid machine 10 includes a fourth oil supply passage 57. As shown in Fig. 13, the fourth oil supply passage 57 is formed to penetrate the end wall 14a of the rotor housing 14 below the actuation portion-side recess 52 in the direction of gravity. As shown in Fig. 10, the fourth oil supply passage 57 has a main passage 57a and a pair of branch passages 57b.

[0083] As shown in FIG. 13 , the first end of the main passage 57a opens to a portion of the outer surface 14e of the end wall 14a of the rotor housing 14, the portion being located between the pair of actuating-part-side through holes 19, and also to a portion through which the plane S passes. The first end of the main passage 57a is the first end of the fourth oil supply passage 57. As shown in FIG. 10 , the second end of the main passage 57a is located inside the end wall 14a of the rotor housing 14. The first ends of each branch passage 57b communicate with the second end of the main passage 57a. The second end of one of the pair of branch passages 57b opens to a portion of one of the pair of actuating-part-side through holes 19 that is located between the bearing 28 and the actuating-chamber-side seal member 32. The second end of the other of the pair of branch passages 57b opens to a portion of the other of the pair of actuating-part-side through holes 19 that is located between the bearing 30 and the actuating-chamber-side seal member 32. Therefore, the fourth oil supply passage 57 opens to each of the pair of actuating-part-side through holes 19. The fourth oil supply passage 57 supplies oil compressed in accordance with the rotation of the power transmission part 40 to the working chamber side seal member 32.

[0084] <Operation unit side convex portion, operation unit side upper convex portion, and operation unit side convex portion> 13 and 14, the fluid machine 10 includes an actuating unit side cylinder portion 80. The actuating unit side cylinder portion 80 protrudes from a portion of the outer surface 14e of the end wall 14a of the rotor housing 14 that is located between the pair of actuating unit side through holes 19. The actuating unit side cylinder portion 80 has a rectangular cylindrical shape. When the outer surface 14e of the end wall 14a of the rotor housing 14 is viewed from above, the actuating unit side cylinder portion 80 surrounds the first end of the fourth oil supply passage 57.

[0085] As shown in Figure 14, the wall portion of the actuating part side cylindrical portion 80 located on the lower side in the direction of gravity is an actuating part side protrusion 81 that is provided on the outer surface 14e of the end wall 14a of the rotor housing 14 so as to face the boundary K1 portion between the compression region 60 and the expansion region 61. Therefore, the actuating part side protrusion 81 is provided on the end wall 14a of the rotor housing 14. The actuating part side protrusion 81 is flat. The actuating part side protrusion 81 extends along an imaginary plane S10.

[0086] The wall portion located on the upper side in the direction of gravity of the actuating unit side cylindrical portion 80 is an actuating unit side upper convex portion 82 that is convexly provided so as to face the compression region 60 above the actuating unit side convex portion 81 on the outer surface 14e of the end wall 14a of the rotor housing 14 in the direction of gravity. Therefore, the actuating unit side upper convex portion 82 is provided on the end wall 14a of the rotor housing 14. The actuating unit side upper convex portion 82 is flat. The actuating unit side upper convex portion 82 extends along an imaginary plane S10. The actuating unit side upper convex portion 82 extends parallel to the actuating unit side convex portion 81. The actuating unit side upper convex portion 82 is disposed between the actuating unit side convex portion 81 and the actuating unit side recess 52 in the direction of gravity. A first end of the fourth oil supply passage 57 opens closer to the actuating unit side convex portion 81 than the actuating unit side upper convex portion 82.

[0087] In the actuating portion-side cylindrical portion 80, a pair of wall portions connecting the actuating portion-side convex portion 81 and the actuating portion-side upper convex portion 82 are actuating portion-side lateral convex portions 83 that are protruded between the actuating portion-side convex portion 81 and the actuating portion-side upper convex portion 82 on the outer surface 14e of the end wall 14a of the rotor housing 14. Therefore, the actuating portion-side lateral convex portions 83 are provided on the end wall 14a of the rotor housing 14. Each actuating portion-side lateral convex portion 83 is flat. Each actuating portion-side lateral convex portion 83 extends parallel to each other. Each actuating portion-side lateral convex portion 83 extends in a direction perpendicular to the imaginary plane S10.

[0088] The surface of the actuating part side convex portion 81 facing the actuating part side upper convex portion 82, the surface of the actuating part side upper convex portion 82 facing the actuating part side convex portion 81, and the opposing surfaces of the pair of actuating part side lateral convex portions 83 form the inner surface of the actuating part side tube portion 80.

[0089] The surface of the operating part-side convex portion 81 that faces the operating part-side upper convex portion 82 is convexly formed on the outer surface 14e of the end wall 14a of the rotor housing 14 so as to face the boundary K1 portion between the compression region 60 and the expansion region 61. The surface of the operating part-side upper convex portion 82 that faces the operating part-side convex portion 81 is convexly formed on the outer surface 14e of the end wall 14a of the rotor housing 14 so as to face the compression region 60 above the operating part-side convex portion 81 in the direction of gravity.

[0090] [Operation of the embodiment] Next, the operation of this embodiment will be described. During operation of the fluid machine 10, the drive gear 41 and the driven gear 42 scoop up the oil in the power transmission chamber 22, causing the oil to flow into the motor-side recess 51 and the actuation-part-side recess 52. Specifically, the rotation of the drive gear 41 and the driven gear 42 causes the oil sealed in the power transmission chamber 22 to be scooped up toward the upper side in the direction of gravity of the power transmission chamber 22 through the gap between the drive gear 41 and the peripheral wall 13b and the gap between the driven gear 42 and the peripheral wall 13b. The oil scooped up by the drive gear 41 and the oil scooped up by the driven gear 42 collide with each other above the meshing portion 53 in the direction of gravity within the power transmission chamber 22, and then flows into the motor-side recess 51 and the actuation-part-side recess 52, respectively.

[0091] The oil that flows into the motor-side recess 51 is supplied to the motor-side through-hole 17 via the first oil supply passage 54. As a result, the motor-chamber-side seal member 31 and the bearing 27 are lubricated by the oil. The oil that flows into the actuating-unit-side recess 52 is supplied to one of the pair of actuating-unit-side through-holes 19 via one of the pair of second oil supply passages 55. As a result, one of the pair of actuating-unit-side seal members 32 and the bearing 28 are lubricated by the oil. In addition, the oil that flows into the actuating-unit-side recess 52 is supplied to the other of the pair of actuating-unit-side through-holes 19 via the other of the pair of second oil supply passages 55. As a result, the other of the pair of actuating-unit-side seal members 32 and the bearing 30 are lubricated by the oil.

[0092] The oil compressed in the compression region 60 is ejected in the axial direction of the drive shaft 24. More specifically, the oil compressed in one of the multiple closed spaces 62, whose volume decreases as the drive gear 41 and the driven gear 42 rotate synchronously, is ejected from the closed space 62 to both sides in the axial direction of the drive shaft 24. In this way, the oil compressed in the compression region 60 and ejected to both sides in the axial direction of the drive shaft 24 flows into the inside of the motor side cylinder portion 70 and the inside of the actuation part side cylinder portion 80.

[0093] The oil that flows into the motor-side cylindrical portion 70 is guided to the third oil supply passage 56 by the motor-side protrusion 71, the motor-side upper protrusion 72, and the motor-side side protrusions 73. Therefore, the motor-side protrusion 71 guides the oil that is compressed and ejected in the compression region 60 to the third oil supply passage 56. The motor-side upper protrusion 72 guides the oil that is compressed and ejected in the compression region 60 to the third oil supply passage 56. The motor-side side protrusions 73 guide the oil that is compressed and ejected in the compression region 60 to the third oil supply passage 56. In this way, the oil compressed in accordance with the rotation of the power transmission unit 40 is supplied to the third oil supply passage 56. The oil supplied to the third oil supply passage 56 is then supplied to the motor-side through-hole 17 via the third oil supply passage 56. This allows the motor chamber-side seal member 31 and the bearing 27 to be lubricated by the oil.

[0094] The oil that has flowed into the actuating-unit-side cylindrical portion 80 is guided to the fourth oil supply passage 57 by the actuating-unit-side convex portion 81, the actuating-unit-side upper convex portion 82, and each actuating-unit-side side convex portion 83. Therefore, the actuating-unit-side convex portion 81 guides the oil that is compressed and ejected in the compression region 60 to the fourth oil supply passage 57. The actuating-unit-side upper convex portion 82 guides the oil that is compressed and ejected in the compression region 60 to the fourth oil supply passage 57. Each actuating-unit-side side convex portion 83 guides the oil that is compressed and ejected in the compression region 60 to the fourth oil supply passage 57. In this way, the oil compressed in accordance with the rotation of the power transmission unit 40 is supplied to the fourth oil supply passage 57. The oil supplied to the fourth oil supply passage 57 is supplied to each actuating-unit-side through-hole 19 via the fourth oil supply passage 57. As a result, each actuating-chamber-side seal member 32 and the bearings 28, 30 are lubricated by the oil.

[0095] [Effects of the embodiment] The above embodiment can provide the following effects. (1) The fluid machine 10 is provided with a third oil supply passage 56 and a fourth oil supply passage 57. For example, if the attitude of the fluid machine 10 is tilted with respect to the axial direction of the drive shaft 24, the flow of oil stirred by the rotation of the power transmission unit 40 into the motor-side recess 51 and the actuation-unit-side recess 52 may become unstable. Even in such a case, the oil compressed by the rotation of the power transmission unit 40 is suitably supplied to the third oil supply passage 56 and the fourth oil supply passage 57. Therefore, the motor chamber-side seal member 31 and the actuation chamber-side seal member 32 can be well lubricated.

[0096] (2) The end wall 13a of the gear housing 13 is provided with a motor-side protrusion 71. As a result, the oil compressed and ejected in the compression region 60 is guided by the motor-side protrusion 71 to the third oil supply passage 56. Therefore, the oil compressed in accordance with the rotation of the power transmission unit 40 is more efficiently supplied to the third oil supply passage 56, thereby further improving the lubrication of the motor-chamber-side seal member 31.

[0097] (3) The end wall 13a of the gear housing 13 is provided with a motor-side upper convex portion 72. As a result, the oil compressed and ejected in the compression region 60 is guided by the motor-side upper convex portion 72 to the third oil supply passage 56. Therefore, the oil compressed in accordance with the rotation of the power transmission unit 40 is more efficiently supplied to the third oil supply passage 56, thereby further improving the lubrication of the motor-chamber-side seal member 31.

[0098] (4) The end wall 13a of the gear housing 13 is provided with a motor-side lateral protrusion 73. With this, the oil compressed and ejected in the compression region 60 is guided by the motor-side lateral protrusion 73 to the third oil supply passage 56. Therefore, the oil compressed in accordance with the rotation of the power transmission unit 40 is more efficiently supplied to the third oil supply passage 56, thereby further improving the lubrication of the motor-chamber-side seal member 31.

[0099] (5) Because the third oil supply passage 56 opens closer to the motor-side convex portion 71 than to the motor-side upper convex portion 72, oil flowing downward in the direction of gravity along the motor-side upper convex portion 72 and the motor-side lateral convex portion 73 is more easily guided to the third oil supply passage 56. Therefore, oil compressed as the power transmission unit 40 rotates is more efficiently supplied to the third oil supply passage 56, thereby further improving lubrication of the motor-chamber-side seal member 31.

[0100] (6) The end wall 14a of the rotor housing 14 is provided with an actuation-chamber-side convex portion 81. As a result, the oil compressed and ejected in the compression region 60 is guided by the actuation-chamber-side convex portion 81 to the fourth oil supply passage 57. Therefore, the oil compressed in accordance with the rotation of the power transmission unit 40 is more efficiently supplied to the fourth oil supply passage 57, thereby further improving the lubrication of the actuation-chamber-side seal member 32.

[0101] (7) The end wall 14a of the rotor housing 14 is provided with an actuating-part-side upper convex portion 82. As a result, the oil compressed and ejected in the compression region 60 is guided by the actuating-part-side upper convex portion 82 to the fourth oil supply passage 57. Therefore, the oil compressed in accordance with the rotation of the power transmission unit 40 is more efficiently supplied to the fourth oil supply passage 57, thereby further improving the lubrication of the actuating-chamber-side seal member 32.

[0102] (8) The end wall 14a of the rotor housing 14 is provided with an actuation-chamber-side lateral protrusion 83. With this, the oil compressed and ejected in the compression region 60 is guided by the actuation-unit-side lateral protrusion 83 to the fourth oil supply passage 57. Therefore, the oil compressed in accordance with the rotation of the power transmission unit 40 is more efficiently supplied to the fourth oil supply passage 57, thereby further improving the lubrication of the actuation-chamber-side seal member 32.

[0103] (9) Because the fourth oil supply passage 57 opens closer to the actuating-chamber-side convex portion 81 than to the actuating-chamber-side upper convex portion 82, oil flowing downward in the direction of gravity along the actuating-unit-side upper convex portion 82 and the actuating-unit-side lateral convex portion 83 is more easily guided to the fourth oil supply passage 57. Therefore, oil compressed as the power transmission unit 40 rotates is more efficiently supplied to the fourth oil supply passage 57, thereby further improving the lubrication of the actuating-chamber-side seal member 32.

[0104] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0105] In the embodiment, the fluid machine 10 may not include, for example, the third oil supply passage 56. In this case, the fluid machine 10 does not include the motor side cylinder portion 70. Furthermore, the fluid machine 10 may not include, for example, the fourth oil supply passage 57. In this case, the fluid machine 10 does not include the actuation part side cylinder portion 80. In short, it is sufficient that the fluid machine 10 includes at least one of the third oil supply passage 56 and the fourth oil supply passage 57.

[0106] In the embodiment, the motor-side cylindrical portion 70 does not have to protrude from the inner surface 13e of the end wall 13a of the gear housing 13. In this case, for example, a recess may be formed on the inner surface 13e of the end wall 13a of the gear housing 13, and the motor-side protrusion 71, the motor-side upper protrusion 72, and the motor-side side protrusion 73 may be defined by walls that define the recess.

[0107] In the embodiment, the actuating unit side cylindrical portion 80 does not have to protrude from the outer surface 14e of the end wall 14a of the rotor housing 14. In this case, for example, a recess may be formed in the outer surface 14e of the end wall 14a of the rotor housing 14, and the actuating unit side convex portion 81, the actuating unit side upper convex portion 82, and the actuating unit side convex portion 83 may be formed by wall portions that define the recess.

[0108] In the above-described embodiment, the fluid machine 10 may be configured such that the motor-side protrusion 71 is not provided on the end wall 13 a of the gear housing 13 . In the above-described embodiment, the fluid machine 10 may be configured such that the motor-side upper protrusion 72 is not provided on the end wall 13 a of the gear housing 13 .

[0109] In the above-described embodiment, the fluid machine 10 may be configured such that the motor-side lateral protrusion 73 is not provided on the end wall 13 a of the gear housing 13 . In the above-described embodiment, the third oil supply passage 56 may open closer to the motor-side upper convex portion 72 than to the motor-side convex portion 71. In short, the position at which the third oil supply passage 56 opens relative to the end wall 13a of the gear housing 13 is not particularly limited as long as the third oil supply passage 56 can supply oil compressed in accordance with rotation of the power transmission unit 40 to the motor-chamber-side seal member 31.

[0110] In the above-described embodiment, the fluid machine 10 may be configured such that the actuation portion-side convex portion 81 is not provided on the end wall 14 a of the rotor housing 14 . In the above-described embodiment, the fluid machine 10 may be configured such that the actuating portion-side upper convex portion 82 is not provided on the end wall 14 a of the rotor housing 14 .

[0111] In the above-described embodiment, the fluid machine 10 may be configured such that the actuation portion-side lateral protrusion 83 is not provided on the end wall 14 a of the rotor housing 14 . In the above-described embodiment, the fourth oil supply passage 57 may open closer to the actuating-unit-side upper convex portion 82 than to the actuating-unit-side convex portion 81. In short, the position at which the fourth oil supply passage 57 opens relative to the end wall 14a of the rotor housing 14 is not particularly limited as long as the fourth oil supply passage 57 can supply oil compressed in accordance with rotation of the power transmission unit 40 to the actuating-chamber-side seal member 32.

[0112] In the above-described embodiment, the drive rotor 44 and the driven rotor 45 may have a trilobe shape or a quadrilobe shape in a cross section perpendicular to the rotational axis direction of the drive shaft 24 and the driven shaft 25, for example.

[0113] In an embodiment, the drive rotor 44 and the driven rotor 45 may have, for example, a helical shape. In the embodiment, the fluid machine 10 does not have to be a pump that supplies hydrogen to a fuel cell that generates electricity by chemically reacting hydrogen, which is a fuel gas, with oxygen contained in air, which is an oxidant gas, and may be used for other purposes. Therefore, the fluid that the operating unit 43 draws in and discharges via the drive shaft 24 and the driven shaft 25 may be something other than hydrogen.

[0114] In an embodiment, [Explanation of symbols]

[0115] 10...Fluid machine, 11...Housing, 13a...End wall as first partition wall, 14a...End wall as second partition wall, 17...Motor side through hole, 19...Actuating part side through hole, 21...Motor chamber, 22...Power transmission chamber, 23...Actuating chamber, 24...Drive shaft, 25...Driven shaft, 26, 27, 28, 29, 30...Bearing, 31...Motor chamber side seal member, 32...Actuating chamber side seal member, 34...Motor, 40...Power transmission part, 41...Drive gear, 41 a...tooth, 42...driven gear, 42a...tooth, 43...actuating portion, 51...motor side recess, 52...actuating portion side recess, 54...first oil supply passage, 55...second oil supply passage, 56...third oil supply passage, 57...fourth oil supply passage, 60...compression region, 61...expansion region, 71...motor side convex portion, 72...motor side upper convex portion, 73...motor side lateral convex portion, 81...actuating portion side convex portion, 82...actuating portion side upper convex portion, 83...actuating portion side lateral convex portion.

Claims

1. Housing and a drive shaft and a driven shaft, each supported by a bearing in the housing and arranged parallel to each other; a motor that rotates the drive shaft; a power transmission unit that rotates the drive shaft and the driven shaft synchronously; an actuating unit that draws in and discharges fluid by the drive shaft and the driven shaft, The housing is formed with a motor chamber that accommodates the motor, an operating chamber that accommodates the operating unit, and a power transmission chamber that accommodates the power transmission unit and oil that lubricates the power transmission unit, the motor chamber, the power transmission chamber, and the operating chamber being arranged in this order; the housing has a first partition wall that separates the motor chamber and the power transmission chamber, and a second partition wall that separates the power transmission chamber and the operating chamber, the first partition wall is formed with a motor-side through-hole through which the drive shaft is inserted, and a motor-side recess that is provided above the motor-side through-hole in the direction of gravity and that collects oil stirred by rotation of the power transmission part, the second partition wall is formed with a pair of actuating unit-side through holes through which the drive shaft and the driven shaft are respectively inserted, and an actuating unit-side recess that is provided above the pair of actuating unit-side through holes in the direction of gravity and in which oil stirred by rotation of the power transmission unit is accumulated; a motor chamber side seal member that seals between the power transmission chamber and the motor chamber is provided in the motor chamber side through hole, an actuation chamber-side seal member that seals between the power transmission chamber and the actuation chamber is provided in each of the pair of actuation portion-side through holes, a first oil supply passage is formed through the first partition wall, the first oil supply passage opening into the motor-side through-hole and supplying oil accumulated in the motor-side recess to the motor-chamber-side seal member; a second oil supply passage penetrating the second partition wall, the second oil supply passage opening into each of the pair of actuating portion side through holes and supplying oil accumulated in the actuating portion side recess to the actuating chamber side seal member, a third oil supply passage formed through the first partition wall lower in the direction of gravity than the motor-side recess, opening into the motor-side through-hole, and supplying oil compressed as the power transmission unit rotates to the motor chamber-side seal member; and a fourth oil supply passage formed through the second partition wall lower in the direction of gravity than the actuating unit-side recess, opening into each of the pair of actuating unit-side through-holes, and supplying oil compressed as the power transmission unit rotates to the actuating chamber-side seal member.

2. The power transmission unit has a drive gear fixed to the drive shaft and a driven gear fixed to the driven shaft, and forms a compression region where teeth of the drive gear and the driven gear come into contact with each other as they rotate, and the gap between the tooth tips and tooth bottoms becomes narrower, and an expansion region where teeth of the drive gear and the driven gear come into contact with each other as they rotate, and the gap between the tooth tips and tooth bottoms becomes wider, 2. The fluid machine according to claim 1, wherein the first partition wall is provided with a motor-side convex portion that is convex so as to face the boundary portion between the compression region and the expansion region and that guides oil compressed and ejected in the compression region to the third oil supply passage.

3. The fluid machine according to claim 2, characterized in that the first partition wall is provided with a motor-side upper convex portion that is convex in the direction of gravity above the motor-side convex portion and faces the compression region, and that guides oil that is compressed and ejected in the compression region to the third oil supply passage.

4. The fluid machine according to claim 3, characterized in that the first partition wall is provided with a motor-side lateral convex portion that is convex between the motor-side convex portion and the motor-side upper convex portion and that guides oil compressed and ejected in the compression region to the third oil supply passage.

5. 5. The fluid machine according to claim 4, wherein the third oil supply passage opens closer to the motor-side convex portion than the motor-side upper convex portion.

6. The power transmission unit has a drive gear fixed to the drive shaft and a driven gear fixed to the driven shaft, and forms a compression region where teeth of the drive gear and the driven gear come into contact with each other as they rotate, and the gap between the tooth tips and tooth bottoms becomes narrower, and an expansion region where teeth of the drive gear and the driven gear come into contact with each other as they rotate, and the gap between the tooth tips and tooth bottoms becomes wider, 2. The fluid machine according to claim 1, wherein the second partition wall is provided with a protruding portion facing the boundary between the compression region and the expansion region, and an actuation portion-side protrusion that guides oil compressed and ejected in the compression region to the fourth oil supply passage.

7. The fluid machine according to claim 6, characterized in that the second partition wall is provided with an actuating unit side upper convex portion that is convex in the direction of gravity above the actuating unit side convex portion so as to face the compression region and guides oil compressed and ejected in the compression region to the fourth oil supply passage.

8. The fluid machine according to claim 7, characterized in that the second partition wall is provided with an actuating portion side convex portion that is convex between the actuating portion side convex portion and the actuating portion side upper convex portion and that guides oil compressed and ejected in the compression region to the fourth oil supply passage.

9. The fluid machine according to claim 8, wherein the fourth oil supply passage opens closer to the actuation portion-side convex portion than the actuation portion-side upper convex portion.

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