Pulley and engine for gas heat pump equipped therewith

Abstract

To hold an outer diameter of a set pulley when providing the outer diameter of the pulley to be variable.SOLUTION: An inside pulley 100 is provided with a flow passage 70 in which fluid can flow. A plurality of outside pulley sections 110 is connected to the inside pulley 100, is provided so as to get in / out in a radial direction of a rotary shaft 21 with respect to the inside pulley 100, and is arranged in a circumferential direction of the rotary shaft 21. A fluid pressure feeding section 60 can forcibly feed fluid selectively in one direction within the flow passage 70 and the other direction opposite to the one direction. Each of the plurality of outside pulley sections 110 has an outer peripheral surface section 111, a shaft section 112, and a holding section 120. A belt is wound on the outer peripheral surface section 111. The shaft section 112 extends from a first end 113 connected to the outer peripheral surface section 111 up to a second end 114 positioned within the flow passage 70. The holding section 120 is provided in the shaft section 112 to be displaceable according to a pressure receiving state from fluid within the flow passage 70 and can hold the position of the outer peripheral surface section 111 in the radial direction.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a pulley and an engine for a gas heat pump including the same.

Background Art

[0002] As a prior art document that discloses a variable-diameter pulley, there is Japanese Utility Model Laid-Open No. 05-025061 (Patent Document 1). The variable-diameter pulley described in Patent Document 1 includes a fixed-side pulley and a movable-side pulley. The movable-side pulley includes a fan-shaped mass that is urged toward the outer peripheral side and a tension spring that urges the fan-shaped mass toward the center side. The movable-side pulley is engaged with the conical surface of the fixed-side pulley such that the fan-shaped mass is movable in the radial direction of the fixed-side pulley.

[0003] As a prior art document that discloses a belt-type continuously variable transmission, there is Japanese Patent Application Laid-Open No. 2014-167306 (Patent Document 2). The belt-type continuously variable transmission described in Patent Document 2 includes a driving pulley. The driving pulley is provided on a driving shaft and is composed of a number of driving unit pulleys arranged in the circumferential direction. A driving unit actuator for adjusting the rotational radius of each driving unit pulley is provided corresponding to each driving unit pulley. Hydraulic pressure is used as the driving means for the driving unit pulley.

[0004] In addition, as prior art documents similar to Patent Document 1 or Patent Document 2, there are Japanese Patent Application Laid-Open No. 63-67466 (Patent Document 3), Japanese Utility Model Laid-Open No. 02-034856 (Patent Document 4), Japanese Patent Application Laid-Open No. 07-305750 (Patent Document 5), and Japanese Patent Application Laid-Open No. 2017-053454 (Patent Document 6).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

[0006] In the variable diameter pulley described in Patent Document 1, the movable pulley fluctuates due to centrifugal force and tension of the tension spring, making it difficult to maintain the pulley's outer diameter. In Patent Document 2, hydraulics are used as the driving means for the driving unit pulley to adjust the rotation radius of the driving unit pulley. However, if the tension of the drive belt is strong on the driving unit pulley, the pulley's outer diameter may fluctuate. Therefore, even in Patent Document 2, when the pulley's outer diameter is set to be variable, it is difficult to maintain the set outer diameter of the pulley.

[0007] The present invention has been made to solve the above problems, and aims to provide a pulley and a gas heat pump engine equipped therewith that can maintain a set outer diameter of the pulley when the outer diameter of the pulley is provided to be variable. [Means for solving the problem]

[0008] The pulley according to the present invention comprises an inner pulley, a plurality of outer pulley sections, and a fluid pumping section. The inner pulley has a fluid passage through which fluid can flow and is rotatable about a rotation axis. The plurality of outer pulley sections are connected to the inner pulley and are rotatable about a rotation axis, and are provided so as to be able to move in and out of the inner pulley in the radial direction of the rotation axis, and are arranged in the circumferential direction of the rotation axis. The fluid pumping section is capable of selectively pumping fluid in one direction within the flow path and in the other direction opposite to that direction. Each of the plurality of outer pulley sections includes an outer circumferential surface section, a shaft section, and a holding section. A belt is wrapped around the outer circumferential surface section. The shaft section extends from a first end connected to the outer circumferential surface section to a second end located in the flow path. The holding section is provided on the shaft section so as to be displaceable according to the pressure received from the fluid in the flow path, and is capable of holding the radial position of the outer circumferential surface section.

[0009] In one embodiment of the present invention, the fluid pumping unit stops pumping fluid when the holding unit holds the radial position of each of the multiple outer pulleys.

[0010] In one embodiment of the present invention, the holding portion includes a movable valve portion and a biasing portion. The movable valve portion is displaced according to the pressure received from the fluid. The biasing portion biases the movable valve portion to resist the displacement of the movable valve portion. The flow path has an engaging portion that can be detachably engaged with the movable valve portion. The radial position of the outer circumferential surface portion is maintained when the movable valve portion is biased by the biasing portion and engages with the engaging portion.

[0011] In one embodiment of the present invention, each of the multiple outer pulley portions has an uneven shape at its circumferential end where the multiple outer pulley portions engage with each other.

[0012] In one embodiment of the present invention, the fluid is oil.

[0013] In one embodiment of the present invention, the holding portion is capable of holding the radial position of the outer peripheral surface portion in steps.

[0014] The engine for a gas heat pump according to the present invention includes the above pulley and a crankshaft. The pulley is connected to a compressor drive pulley via a belt. The crankshaft is coaxially connected to an inner pulley.

Advantages of the Invention

[0015] According to the present invention, when the outer diameter of the pulley is provided to be variable, the set outer diameter of the pulley can be maintained.

Brief Description of the Drawings

[0016] [Figure 1] It is a schematic diagram showing the configuration of a gas heat pump air conditioner according to Embodiment 1 of the present invention. [Figure 2] It is a front view showing the configuration when the outer diameter of the pulley included in the engine for a gas heat pump according to Embodiment 1 of the present invention is at its minimum. [Figure 3] It is a cross-sectional view of the configuration around the pulley in FIG. 2 as seen from the direction of the arrow along line III-III. [Figure 4] It is an enlarged cross-sectional view showing the configuration around the outer pulley portion in FIG. 3. [Figure 5] It is a front view showing the configuration when the outer diameter of the pulley included in the engine for a gas heat pump according to Embodiment 1 of the present invention is at its maximum. [Figure 6] It is a cross-sectional view of the configuration around the pulley in FIG. 5 as seen from the direction of the arrow along line VI-VI. [Figure 7] It is an enlarged cross-sectional view showing the configuration around the outer pulley portion in FIG. 6. [Figure 8] It is a cross-sectional view showing the configuration when the outer diameter of the pulley included in the engine for a gas heat pump according to Embodiment 1 of the present invention is at an intermediate position. [Figure 9] It is a side view of the configuration of the outer pulley portion in FIG. 2 as seen from the direction of the arrow along line IX. [Figure 10] It is a side view of the configuration of the outer pulley portion in FIG. 5 as seen from the direction of the arrow along line X. [Figure 11]This is a cross-sectional view showing the configuration of a pulley in a gas heat pump engine according to Embodiment 2 of the present invention. [Modes for carrying out the invention]

[0017] Embodiments of the present invention will be described below with reference to the drawings. In the following description of embodiments, the same or corresponding parts will be denoted by the same reference numerals, and their descriptions will not be repeated.

[0018] In the drawings, the direction in which the outer pulley portion moves in and out of the inner pulley is the X direction, the direction in which the outer pulley portion moves in and out of the inner pulley and is perpendicular to the X direction is the Y direction, and the direction of the pulley's rotation axis is the Z direction.

[0019] (Embodiment 1) Figure 1 is a schematic diagram showing the configuration of a gas heat pump air conditioner according to Embodiment 1 of the present invention.

[0020] The gas heat pump air conditioner 1 according to Embodiment 1 of the present invention is a gas heat pump (GHP) type air conditioner that performs air conditioning using a gas engine as an internal combustion engine as a driving source. The internal combustion engine is not limited to a gas engine, but may also be a gasoline engine, LNG engine, or ethanol engine, etc.

[0021] As shown in Figure 1, the gas heat pump air conditioner 1 comprises a gas heat pump engine 2, a compressor 3, a belt 5, and an auto tensioner 6.

[0022] The gas heat pump engine 2 drives the compressor 3. The compressor 3 compresses a refrigerant (not shown) and provides heating and cooling through a refrigeration cycle. The compressor 3 includes a compressor drive pulley 4.

[0023] The pulley 10 of the gas heat pump engine 2, described later, is connected to the compressor drive pulley 4 via a belt 5. The pulley 10 and the compressor drive pulley 4 are wrapped around the belt 5, and the rotation of the pulley 10 causes the compressor drive pulley 4 to rotate. The auto tensioner 6 is provided to adjust the tension of the belt 5 when the tension of the belt 5 fluctuates.

[0024] Figure 2 is a front view showing the configuration of the pulley in the gas heat pump engine according to Embodiment 1 of the present invention when the outer diameter of the pulley is at its minimum. Figure 3 is a cross-sectional view of the configuration around the pulley in Figure 2, viewed from the direction of the arrow III-III. Note that in Figure 2, components other than the pulley are not shown.

[0025] As shown in Figures 2 and 3, the gas heat pump engine 2 according to Embodiment 1 of the present invention includes a pulley 10, a crankshaft 20, a bolt member 30, a cover member 40, a seal member 50, and a fluid pumping unit 60.

[0026] The pulley 10 is rotatably mounted by the drive of the gas heat pump engine 2. The pulley 10 is connected to the end of the crankshaft 20 by a bolt member 30. The pulley 10 is made of aluminum alloy or steel, or the like.

[0027] The cover member 40 is a component that houses the drive mechanism of the internal combustion engine, such as the crankshaft 20. The cover member 40 is connected to the pulley 10 via a sealing member 50 in a manner that allows the pulley 10 to rotate. The sealing member 50 is configured, for example, by a sealing ring mechanism.

[0028] The fluid pumping unit 60 is connected to the cover member 40. The fluid pumping unit 60 can selectively pump fluid in one direction and in the opposite direction within the flow path 70, which will be described later, provided in the pulley 10 and the cover member 40. In this embodiment, the fluid is oil. Therefore, the fluid pumping unit 60 can apply hydraulic pressure to the flow path 70. Note that the fluid is not limited to oil and may be air or other fluids.

[0029] The pulley 10 has an inner pulley 100 and an outer pulley portion 110.

[0030] The inner pulley 100 is located on the inside of the pulley 10 when viewed from the Z direction. The inner pulley 100 has a through hole 101 that has a bore axis coaxial with the rotation axis 21 and penetrates in the Z direction. A bolt member 30 is inserted through the through hole 101, and the bolt member 30 is connected to the tip of the crankshaft 20, thereby connecting the crankshaft 20 coaxially with the inner pulley 100. As a result, the inner pulley 100 is rotatable around the rotation axis 21.

[0031] The inner pulley 100 is provided with a fluid passage 70 through which fluid can flow. In this embodiment, the fluid passage 70 constitutes a hydraulic path through which oil pumped from the fluid pumping unit 60 flows.

[0032] The flow path 70 has a first flow path 71, a second flow path 72, and a third flow path 73. The first flow path 71 is one path for the fluid flowing from the fluid pumping unit 60. The second flow path 72 is the other path for the fluid flowing from the fluid pumping unit 60. The third flow path 73 is the path that constitutes the range in which the outer pulley unit 110 operates in the flow path 70.

[0033] The multiple outer pulley sections 110 that make up the outer pulley are the parts over which the belt 5 is routed. The multiple outer pulley sections 110 are located on the outer side of the pulley 10 when viewed from the Z direction.

[0034] Each of the multiple outer pulley portions 110 is arranged in the circumferential direction of the rotation shaft 21. In this embodiment, the multiple outer pulley portions 110 are composed of six outer pulley portions 110. However, the number of multiple outer pulley portions 110 is not limited to six. It is preferable to have as many multiple outer pulley portions 110 as possible. When there are many multiple outer pulley portions 110, if the outer diameter of the multiple outer pulley portions 110 becomes large, the outermost part approaches a perfect circle, making it easier to make close contact with the belt 5 and rotate the belt 5.

[0035] Multiple outer pulley sections 110 are connected to the inner pulley 100 and are rotatable around the rotation axis 21. Furthermore, the multiple outer pulley sections 110 are positioned to move in and out of the inner pulley 100 in the radial direction (Y direction in Figure 3) of the rotation axis 21.

[0036] The outer pulley portion 110 has an outer peripheral surface portion 111, a shaft portion 112, and a holding portion 120.

[0037] The belt 5 is wrapped around the outer peripheral surface portion 111. The outermost part of the outer peripheral surface portion 111 has peaks and valleys formed to allow the belt 5 to easily follow the pulley 10.

[0038] The shaft portion 112 is the part that supports the outer circumferential surface portion 111. The shaft portion 112 extends in the radial direction (Y direction in Figure 3). The shaft portion 112 extends from the first end portion 113 connected to the outer circumferential surface portion 111 to the second end portion 114 located in the flow path.

[0039] The retaining portion 120 is provided on the shaft portion 112 so as to be displaceable in accordance with the pressure received from the fluid in the flow path 70. In this embodiment, the retaining portion 120 is provided on the second end portion 114 of the shaft portion 112.

[0040] The retaining portion 120 is capable of holding the radial position (Y direction in Figure 3) of the outer peripheral surface portion 111. In this embodiment, the retaining portion 120 is capable of holding the radial position of the outer peripheral surface portion 111 when the outer diameter of the pulley 10 is at its maximum or minimum.

[0041] The holding portion 120 has a movable valve portion 121 and a biasing portion 122.

[0042] The movable valve section 121 is positioned to partition the flow path 70 midway. The movable valve section 121 is displaced according to the pressure received from the fluid. In this embodiment, the movable valve section 121 is displaced radially (in the Y direction in Figure 3) within the third flow path 73.

[0043] The biasing unit 122 biases the movable valve unit 121 to resist the displacement of the movable valve unit 121. In this embodiment, the biasing unit 122 biases the movable valve unit 121 in the Z direction to resist the radial displacement of the movable valve unit 121 (Y direction in Figure 3).

[0044] In this embodiment, the biasing portion 122 is, for example, a spring. However, the biasing portion 122 is not limited to a spring; it may be any other biasing member, such as hard rubber, as long as it can be configured to allow displacement of the radial position of the movable valve portion 121.

[0045] The flow path 70 has an engaging portion 130 that can be detachably engaged with the movable valve portion 121. In this embodiment, the engaging portion 130 is located in the third flow path 73. The position of the retaining portion 120 is maintained when the movable valve portion 121 engages with the engaging portion 130 in the third flow path 73. This maintains the radial position of the outer peripheral surface portion 111 of the outer pulley portion 110 connected to the movable valve portion 121.

[0046] In this embodiment, the engaging portion 130 has a first engaging portion 131 and a second engaging portion 132. The first engaging portion 131 is the engagement position between the third flow path 73 and the retaining portion 120 when the outer diameter of the pulley 10 is at its minimum. The second engaging portion 132 is the engagement position between the third flow path 73 and the retaining portion 120 when the outer diameter of the pulley 10 is at its maximum.

[0047] Figure 4 is a cross-sectional view showing an enlarged view of the configuration around the outer pulley portion in Figure 3. As shown in Figure 4, when the outer diameter of the outer pulley portion 110 is at its minimum, the retaining portion 120 is engaged with the first engaging portion 131.

[0048] The movable valve portion 121 has a first surface portion 123, a second surface portion 124, and a third surface portion 125. The first surface portion 123 is a surface perpendicular to the biasing direction (Z direction) of the biasing portion 122. The second surface portion 124 is a surface parallel to the biasing direction (Z direction) of the biasing portion 122 and located on the inner diameter side of the pulley 10. The third surface portion 125 is a surface parallel to the biasing direction (Z direction) of the biasing portion 122 and located on the outer diameter side of the pulley 10.

[0049] The third flow path 73 has a first contact surface 135 and a sliding wall portion 136. The first contact surface 135 is the surface that the second surface portion 124 of the movable valve portion 121 contacts. The sliding wall portion 136 is the portion that the first surface portion 123 slides within the third flow path 73 when the movable valve portion 121 is displaced radially.

[0050] The first surface portion 123 is positioned on the first channel 71 side of the sliding wall portion 136 of the third channel 73, causing the movable valve portion 121 to engage with the first engaging portion 131. This fixes the radial position of the holding portion 120.

[0051] In the first engagement portion 131, a first gap G1 is provided between the third flow path 73 and the second surface portion 124. This allows hydraulic pressure to be applied to the second surface portion 124 by the oil pumped into the first flow path 71.

[0052] Figure 5 is a front view showing the configuration of the pulley in the gas heat pump engine according to Embodiment 1 of the present invention when the outer diameter of the pulley is at its maximum. Figure 6 is a cross-sectional view of the configuration around the pulley in Figure 5, viewed from the direction of the arrow VI-VI. Figure 7 is an enlarged cross-sectional view showing the configuration around the outer pulley portion in Figure 6. Note that in Figure 5, components other than the pulley are not shown.

[0053] As shown in Figures 5 to 7, the outer pulley portion 110 protrudes radially from inside the inner pulley 100 on the XY plane. This increases the outer diameter of the pulley 10. When the outer diameter of the outer pulley portion 110 is at its maximum, the retaining portion 120 is engaged with the second engaging portion 132.

[0054] The third flow path 73 further has a second contact surface 137. The second contact surface 137 is the portion to which the third surface 125 of the movable valve portion 121 makes contact. The movable valve portion 121 engages with the second engagement portion 132 because the first surface 123 is positioned on the second flow path 72 side of the sliding wall portion 136 of the third flow path 73. This fixes the radial position of the retaining portion 120.

[0055] In the second engagement portion 132, a second gap G2 is provided between the third flow path 73 and the third surface portion 125. This allows hydraulic pressure to be applied to the third surface portion 125 by the oil pumped into the second flow path 72.

[0056] The operation of the outer pulley section 110 and the fluid pumping section 60 when the outer diameter of the pulley 10 changes will be described below.

[0057] Figure 8 is a cross-sectional view showing the configuration of a gas heat pump engine according to Embodiment 1 of the present invention when the outer diameter of the pulley is in an intermediate position. Figure 8 illustrates the case in which hydraulic pressure is applied from the fluid pumping section 60 to the second flow path 72 in the direction of the arrow in the figure.

[0058] First, as shown in Figure 7, when hydraulic pressure is applied to the second flow path 72 while the holding portion 120 is engaged with the second engagement portion 132, hydraulic pressure is applied to the first surface portion 123 and the third surface portion 125 of the movable valve portion 121. As a result, the biasing portion 122 elastically deforms in a direction that compresses it in the Z direction. This causes the holding portion 120 to disengage from the second engagement portion 132.

[0059] Next, as shown in Figure 8, hydraulic pressure is continuously applied to the third surface portion 125. As a result, the holding portion 120 moves radially inward while the first surface portion 123 slides on the sliding wall portion 136 of the third flow path 73.

[0060] Next, as shown in Figure 4, after the second surface portion 124 moves until it contacts the first contact surface 135, the biasing portion 122 elastically deforms in the Z direction, causing the movable valve portion 121 to engage with the first engaging portion 131. Since the outer peripheral surface portion 111 is connected to the holding portion 120 via the shaft portion 112, the outer peripheral surface portion 111 also displaces in accordance with the displacement of the holding portion 120.

[0061] As described above, the movable valve portion 121 is biased by the biasing portion 122 and engages with the engaging portion 130, thereby maintaining the radial position of the outer peripheral surface portion 111. Therefore, the position of the holding portion 120 engages with the engaging portion 130 in the flow path 70, thereby maintaining the outer diameter of the outer pulley portion 110. As a result, when the tension of the belt 5 is strongly applied to the outer pulley portion 110, fluctuations in the outer diameter of the pulley 10 can be suppressed. Consequently, compared to the case where the holding portion 120 is not provided, variations in the set outer diameter of the outer pulley portion 110 can be suppressed.

[0062] The fluid pumping unit 60 stops pumping fluid when the holding unit 120 holds the radial position of each of the multiple outer pulley units 110. Because the radial position of the outer pulley units 110 is held when the holding unit 120 engages with the engaging unit 130, the continuous pumping of fluid into the flow path 70 by the fluid pumping unit 60 can be stopped when the radial position of the outer pulley units 110 is held. This allows the pulley 10 to be driven with energy savings.

[0063] When operating the compressor 3 at a low load and low rotation speed, it is necessary to reduce the rotation speed of the pulley 10. However, when operating the pulley 10 at low rotation speed, problems such as seizure due to insufficient lubrication in the sliding parts of the gas heat pump engine 2 arise. Therefore, with the pulley 10 according to this embodiment, the outer diameter of the pulley 10 can be varied, and by reducing the outer diameter of the pulley 10, it is possible to prevent the rotation speed of the pulley 10 from becoming too low, thereby enabling the compressor 3 to be operated at a low rotation speed. In addition, since the outer diameter of the pulley 10 can be adjusted, the control range of the rotation speed of the compressor 3 can be increased.

[0064] The flow path 70 may be provided in multiple locations on the inner pulley 100, allowing each of the multiple outer pulley sections 110 to move in and out individually. Alternatively, the flow path 70 may be provided in one location on the inner pulley 100, allowing all of the multiple outer pulley sections 110 to move in and out simultaneously.

[0065] Figure 9 is a side view of the outer pulley section of Figure 2, viewed from the direction of the arrow IX. Figure 10 is a side view of the outer pulley section of Figure 5, viewed from the direction of the arrow X.

[0066] As shown in Figures 9 and 10, the outer pulley portion 110 has peaks 115 and valleys 116 on the outermost surface of the outer peripheral surface portion 111. The peaks 115 and valleys 116 are arranged alternately in the Z direction.

[0067] Each of the multiple outer pulley portions 110 has a concave and concave shape that engages with each other at the circumferential end of the rotating shaft 21. The concave and concave shapes 117 of adjacent outer pulley portions 110 are engaged. The concave and concave shapes 117 are engaged in both the minimum and maximum outer diameter of the outer pulley portion 110. The engagement of the concave and concave shapes 117 of adjacent outer pulley portions 110 prevents the positional relationship of each of the multiple outer pulley portions 110 from shifting in the rotation axis direction (Z direction) of the pulley 10.

[0068] In the pulley 10 according to Embodiment 1 of the present invention, the outer diameter of the pulley can be made variable by providing each of the multiple outer pulley portions 110 so as to be able to move in and out radially relative to the inner pulley 100. Furthermore, when the outer diameter of the pulley 10 is made variable, the outer diameter of each of the set multiple outer pulley portions 110 can be maintained by having the holding portion 120 engage with the engaging portion 130 provided in the flow path 70 and maintaining its radial position.

[0069] In the pulley 10 according to Embodiment 1 of the present invention, when the radial position of each of the multiple outer pulley portions 110 is maintained, the continuous supply of fluid from the fluid supply portion 60 to the flow path 70 can be stopped. This allows the pulley 10 to be driven in an energy-saving manner.

[0070] In the pulley 10 according to Embodiment 1 of the present invention, the holding portion 120 can be made simpler in configuration by engaging the movable valve portion 121 with the engaging portion 130 on the flow path 70 by the biasing force of the biasing portion 122.

[0071] In the pulley 10 according to Embodiment 1 of the present invention, each of the multiple outer pulley portions 110 engages with each other in the circumferential direction via the irregularities 117, thereby suppressing misalignment of each of the multiple outer pulley portions 110 in the axial direction (Z direction) of the rotating shaft 21. As a result, the outer pulley portions 110 can be rotated efficiently.

[0072] In the pulley 10 according to Embodiment 1 of the present invention, the fluid pressure can be increased compared to the case where the fluid is air, because the fluid flowing through the fluid pressure supply section 60 is oil. As a result, the set outer diameters of the multiple outer pulley sections 110 can be reliably maintained, and variations in the set outer diameter of the pulley 10 can be suppressed.

[0073] In the gas heat pump engine 2 according to Embodiment 1 of the present invention, the outer diameter of the pulley 10 is varied, and by reducing the outer diameter of the pulley 10, it is possible to suppress the rotational speed of the pulley 10 from becoming too low, thereby enabling the compressor 3 to be operated at a low rotational speed. As a result, the rotational speed of the gas heat pump engine 2 is suppressed from becoming too low, and thus seizure of the gas heat pump engine 2 can be suppressed.

[0074] (Embodiment 2) The pulley according to Embodiment 2 of the present invention will now be described. Since the configuration of the inner pulley and outer pulley portion of the pulley according to Embodiment 2 of the present invention differs from that of the pulley 10 according to Embodiment 1 of the present invention, the configuration which is the same as that of the pulley 10 according to Embodiment 1 of the present invention will not be repeated.

[0075] Figure 11 is a cross-sectional view showing the configuration of a pulley in a gas heat pump engine according to Embodiment 2 of the present invention.

[0076] As shown in Figure 11, the pulley 10A according to Embodiment 2 comprises an inner pulley 100A and an outer pulley portion 110A.

[0077] The inner pulley 100A is provided with a first flow path 71, a second flow path 72, and a third flow path 73A. The third flow path 73A has a sliding wall portion 136A. The sliding wall portion 136A is provided with a plurality of recesses 138A. The plurality of recesses 138A are arranged along the radial direction (Y direction in Figure 11).

[0078] The outer pulley portion 110A includes a retaining portion 120A. The retaining portion 120A has a movable valve portion 121A and a biasing portion 122A. In this embodiment, the movable valve portion 121A has a rounded arc shape at its tip.

[0079] The movable valve portion 121A can engage with any of the multiple recesses 138A. This allows the retaining portion 120A to hold the radial position of the outer peripheral surface portion 111 in stages. By adjusting the hydraulic pressure in the fluid pumping section, the movable valve portion 121A can be engaged with the engaging portion 130 or any of the multiple recesses 138A. By the movable valve portion 121A engaging with any of the multiple recesses 138A, the outer pulley portion 110A can hold its outer diameter at an intermediate position between the maximum and minimum diameters.

[0080] In the pulley 10A according to Embodiment 2 of the present invention, the holding portion 120A can engage with any of the plurality of recesses 138A, thereby enabling the radial position of the outer peripheral surface portion 111 to be held in steps, and thus the outer diameter of the pulley 10A can be set in steps.

[0081] [Note] This embodiment includes the following disclosures.

[0082] [Configuration 1] It has a fluid passage inside, and an inner pulley that can rotate around the axis of rotation, Multiple outer pulley portions are connected to the inner pulley, are rotatable about the rotation axis, and are provided so as to be able to move in and out of the inner pulley in the radial direction of the rotation axis, and are arranged in the circumferential direction of the rotation axis, The system includes a fluid pumping unit capable of selectively pumping the fluid in one direction within the flow path and in the other direction opposite to that direction, Each of the plurality of outer pulley portions is a pulley comprising an outer circumferential surface portion around which a belt is wound, a shaft portion extending from a first end connected to the outer circumferential surface portion to a second end located in the flow path, and a holding portion provided on the shaft portion so as to be displaceable in accordance with the pressure received from the fluid in the flow path, and capable of maintaining the radial position of the outer circumferential surface portion.

[0083] [Configuration 2] The pulley according to configuration 1, wherein the fluid pumping unit stops pumping the fluid when the holding unit holds the radial position of each of the plurality of outer pulleys.

[0084] [Configuration 3] The holding portion includes a movable valve portion that is displaced according to the pressure received from the fluid, and a biasing portion that biases the movable valve portion to resist the displacement of the movable valve portion. The flow path has an engagement portion that can be detachably engaged with the movable valve portion, The pulley according to configuration 1 or configuration 2, wherein the movable valve portion is biased by the biasing portion and engages with the engaging portion, thereby maintaining the radial position of the outer peripheral surface portion.

[0085] [Structure 4] The pulley according to any one of configurations 1 to 3, wherein each of the plurality of outer pulley portions has an uneven shape at its circumferential end that allows the plurality of outer pulley portions to engage with each other.

[0086] [Composition 5] The fluid is oil, as described in any one of configurations 1 to 4, of the pulley.

[0087] [Composition 6] The pulley according to any one of configurations 1 to 5, wherein the holding portion is capable of holding the radial position of the outer peripheral surface portion in stages.

[0088] [Composition 7] A pulley according to any one of configurations 1 to 6, which is connected to a compressor drive pulley via the aforementioned belt, An engine for a gas heat pump, comprising a crankshaft coaxially connected to the aforementioned inner pulley.

[0089] The embodiments disclosed herein are illustrative in all respects and do not constitute a limiting interpretation. Therefore, the technical scope of this disclosure is not limited to the embodiments described above. Furthermore, all modifications within the meaning and scope of equivalence to the claims are included. In the description of the embodiments above, combinatorial configurations may be combined with each other. [Explanation of symbols]

[0090] 1 Gas heat pump air conditioner, 2 Gas heat pump engine, 3 Compressor, 4 Compressor drive pulley, 5 Belt, 6 Auto tensioner, 10, 10A Pulley, 20 Crankshaft, 21 Rotating shaft, 30 Bolt member, 40 Cover member, 50 Seal member, 60 Fluid pumping section, 70 Flow path, 71 First flow path, 72 Second flow path, 73, 73A Third flow path, 100, 100A Inner pulley, 101 Through hole, 110, 110A Outer pulley section, 111 Outer peripheral surface section, 112 Shaft section, 113 First end, 114 Second end, 115 Peak section, 116 Valley section, 117 Irregularities, 120, 120A Holding section, 121, 121A Movable valve section, 122, 122A Biasing section, 123 First surface, 124 Second surface, 125 Third surface, 130 Engaging portion, 131 First engaging portion, 132 Second engaging portion, 135 First contact surface, 136, 136A Sliding wall portion, 137 Second contact surface, 138A Multiple recesses, G1 First gap, G2 Second gap.

Claims

1. It has a fluid passage inside, and an inner pulley that can rotate around the axis of rotation, Multiple outer pulley portions are connected to the inner pulley, are rotatable about the rotation axis, and are provided so as to be able to move in and out of the inner pulley in the radial direction of the rotation axis, and are arranged in the circumferential direction of the rotation axis, The system includes a fluid pumping unit capable of selectively pumping the fluid in one direction within the flow path and in the other direction opposite to that direction, Each of the plurality of outer pulley portions is a pulley, each including an outer circumferential surface portion around which a belt is wound, a shaft portion extending from a first end connected to the outer circumferential surface portion to a second end located in the flow path, and a holding portion provided on the shaft portion so as to be displaceable in accordance with the pressure received from the fluid in the flow path and capable of maintaining the radial position of the outer circumferential surface portion.

2. The pulley according to claim 1, wherein the fluid pumping unit stops pumping the fluid when the holding unit holds the radial position of each of the plurality of outer pulleys.

3. The holding portion includes a movable valve portion that is displaced according to the pressure received from the fluid, and a biasing portion that biases the movable valve portion to resist the displacement of the movable valve portion. The flow path has an engagement portion that can be detachably engaged with the movable valve portion, The pulley according to claim 1 or claim 2, wherein the movable valve portion is biased by the biasing portion and engages with the engaging portion, thereby maintaining the radial position of the outer peripheral surface portion.

4. The pulley according to claim 1 or claim 2, wherein each of the plurality of outer pulley portions has an uneven shape at its circumferential end that allows the plurality of outer pulley portions to engage with each other.

5. The pulley according to claim 1 or claim 2, wherein the fluid is oil.

6. The pulley according to claim 1 or claim 2, wherein the holding portion is capable of holding the radial position of the outer peripheral surface portion in steps.

7. A pulley according to claim 1 or claim 2, which is connected to a compressor drive pulley via the belt, An engine for a gas heat pump, comprising a crankshaft coaxially connected to the aforementioned inner pulley.

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