Control valve

Abstract

This control valve comprises: a casing (21); and a rotor (23). The casing (21) has an inlet (37) and an outlet (34). The rotor (23) has a circumferential wall (23b) in which connection ports (39A, 39B) are formed. The circumferential wall (23b) of the rotor (23) is provided with a diameter-gradually-reduced surface (38) which is gradually reduced in outer diameter from one end side to the other end side in the axial direction and in which the connection ports (39A, 39B) are formed. A rotor storage (35) of the casing (21) is provided with a rotor guide surface which is gradually increased, in the radially-inward protruding amount, from one end side to the other end side in the axial direction and which abuts, at the radially-inward end surface thereof, against the diameter-gradually-reduced surface (38) of the circumferential wall (23b) so as to freely slide. The outlet (34) is disposed on a part of the rotor guide surface so as to face the circumferential wall (23b) of the rotor (23).

Description

[Technical Field]

[0001] The present invention relates to a control valve. This application claims priority based on Japanese Patent Application No. 2021-201629, filed on December 13, 2021, the contents of which are incorporated herein by reference. [Background technology]

[0002] A vehicle is equipped with a cooling system that cools a heat-generating part (e.g., an engine, a motor, etc.) with a coolant that circulates between the heat-generating part and a heat-dissipating part (e.g., a radiator, a heater core, etc.). In this type of cooling system, a control valve is provided in a flow path connecting the heat-generating part and the heat-dissipating part to control the flow of the coolant.

[0003] For example, Patent Document 1 below discloses a control valve having a casing with a coolant outlet and a cylindrical rotor with a bottom that is rotatably mounted within the casing. The cylindrical part of the rotor has a communication port that connects the inner space of the rotor with the outlet as the rotor rotates. With this configuration, the communication between the outlet and the communication port can be switched on and off by rotating the rotor. The coolant that flows into the control valve flows into the internal space of the rotor and then flows out of the control valve through the outlet that is in communication with the communication port. As a result, the coolant that flows into the control valve is distributed to the desired heat dissipation section in accordance with the rotation of the rotor.

[0004] The control valve also has a cylindrical seal attached to the outlet, with its end face slidably abutting against the outer circumferential surface of the rotor, and is biased toward the outer circumferential surface of the rotor by a biasing member such as a coil spring. With this control valve, the above-described configuration allows stable communication between the outlet and the communication port, even if the cylindrical portion of the rotor expands or contracts due to heat. That is, when the cylindrical portion of the rotor expands or contracts due to heat, the seal cylinder moves back and forth in accordance with the change in the outer diameter of the cylindrical portion, and the abutting state between the outer circumferential surface of the cylindrical portion of the rotor and the seal cylinder is maintained. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2020-197305 Summary of the Invention [Problem to be solved by the invention]

[0006] In the control valve of the above-mentioned prior art, the rotor is rotatably supported in the casing by a dedicated bearing provided between the rotor and the casing. Furthermore, the above-mentioned seal cylinder and biasing member are assembled to a radially outer position of the rotor inside the casing. Therefore, the control valve of the above-mentioned prior art has a large number of parts and a complex structure, leaving room for improvement in terms of miniaturizing the entire device.

[0007] The aspects of the present invention have been made in consideration of the above circumstances, and have as their object to provide a control valve that can reduce the number of parts, simplify the structure, and make the entire device smaller. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention employs the following aspects. (1) A control valve according to one aspect of the present invention comprises a casing having an inlet through which a fluid flows in from the outside and an outlet through which the fluid flows out to the outside, and a rotor having a peripheral wall formed with a communication port penetrating in a radial direction, the rotor being rotatably accommodated inside the casing and switching between a communication state in which the inlet and the outlet are communicated through the communication port and a blocking state in which the communication between the inlet and the outlet is blocked in an area of ​​the peripheral wall without the communication port depending on the rotation position, the peripheral wall of the rotor being configured to have a circumferential wall that is rotatably accommodated inside the casing and a rotor having a circumferential wall formed with a circumferential wall that is rotatably accommodated inside the casing and switching between a communication state in which the inlet and the outlet are communicated through the communication port and a blocking state in which the communication between the inlet and the outlet is blocked in an area of ​​the peripheral wall without the communication port, the rotor being configured to have a circumferential wall that is rotatably accommodated inside the casing and a communication port penetrating the peripheral wall. The rotor accommodating portion of the casing that accommodates the rotor has a rotor guide surface whose radially inward projection gradually increases from the one end toward the other end in the axial direction along the rotation axis of the rotor, and the radially inner end face of the casing slidably abuts the gradually reducing diameter surface of the peripheral wall, and the outflow port is arranged on a part of the rotor guide surface so as to face the gradually reducing diameter surface of the rotor.

[0009] In the above-described embodiment, the rotor housed in the casing is slidably supported on the rotor guide surface on the casing side at the gradually reducing diameter surface. The rotor guide surface has an outlet arranged facing the gradually reducing diameter surface of the rotor, so the outlet is opened and closed by the gradually reducing diameter surface of the rotor depending on the rotational position of the rotor (opened and closed by an area on the gradually reducing diameter surface where a communication port exists and an area where a communication port does not exist). Furthermore, because both the gradually reducing diameter surface and the rotor guide surface are inclined or curved radially inward from one axial end to the other axial end, when the outer diameter of the rotor's peripheral wall expands or contracts due to heat, the rotor displaces axially on the rotor guide surface in accordance with the increase or decrease in the outer diameter of the peripheral wall. Therefore, regardless of thermal expansion and contraction of the peripheral wall, the gradually reducing diameter surface of the rotor is stably supported and slidably on the rotor guide surface. This makes it possible to omit a dedicated bearing for rotatably supporting the rotor in the casing, as well as a seal tube for connecting the outlet to the communication port in the rotor's peripheral wall and a biasing member for biasing the seal tube toward the rotor's peripheral wall.

[0010] (2): In the above aspect (1), the gradually reducing diameter surface may be formed by a tapered surface whose outer diameter gradually reduces at a constant rate from the one end side toward the other end side in the axial direction, and the rotor guide surface may be formed by a tapered surface whose radially inward protrusion amount gradually increases at the same constant rate as the gradually reducing diameter surface from the one end side toward the other end side in the axial direction.

[0011] In this case, since the gradually reducing diameter surface and the rotor guide surface are formed by tapered surfaces inclined at the same angle, even when the rotor's peripheral wall expands and contracts due to heat and the rotor is displaced in the axial direction, the gradually reducing diameter surface and the rotor guide surface can be brought into stable contact over a wide area.

[0012] (3): In the above aspect (1) or (2), the rotor may have an opening at one end of the peripheral wall in the axial direction, and the other end of the axial direction may be closed by a bottom wall, and the opening may be connected to the inlet.

[0013] In this case, when a fluid flows into the casing through the inlet, the fluid passes through the opening in the rotor and flows into the peripheral wall. At this time, the rotor is pressed toward the other end in the axial direction by the pressure of the fluid, and this component force acts as a pressing force that presses the gradually reducing diameter surface of the rotor against the rotor guide surface on the casing side. As a result, the gradually reducing diameter surface of the rotor is pressed against the peripheral edge of the outlet on the rotor guide surface, and when the communication port of the rotor is in communication with the outlet, leakage of the fluid from the peripheral edge of the outlet is suppressed. Furthermore, when the communication port of the rotor is not in communication with the outlet, leakage of the fluid into the communication port is suppressed.

[0014] (4) In the above aspect (3), the inlet may be formed in a cylindrical wall extending into the opening along the axial direction of the peripheral wall.

[0015] In this case, when the fluid flows into the peripheral wall of the rotor from the inlet, the flow of the fluid is less likely to directly hit the edge of one axial end of the peripheral wall or the peripheral area thereof, which makes it possible to suppress pressure loss of the fluid flowing into the peripheral wall of the rotor.

[0016] (5): In any one of the above aspects (1) to (4), a biasing member may be disposed between the casing and the rotor to bias the rotor toward the other end in the axial direction.

[0017] In this case, the component force of the biasing member that biases the rotor toward the other end in the axial direction acts as a force that presses the gradually tapering surface of the rotor against the rotor guide surface on the casing side, so that the peripheral edge of the outlet on the rotor guide surface is pressed against the gradually tapering surface of the rotor, thereby suppressing fluid leakage from the peripheral edge of the outlet.

[0018] (6) In any one of the above aspects (1) to (5), the rotor guide surface may be formed in an annular shape in the rotor accommodating portion so as to surround the circumferential area of ​​the gradually decreasing diameter surface.

[0019] In this case, the circumferential area of ​​the gradually tapering surface on the rotor side abuts against the annular rotor guide surface, so that the rotor is maintained in a stable position when the rotor is rotating.

[0020] (7): In any one of the above aspects (1) to (5), the inner circumferential surface of the rotor accommodating portion may be provided with a plurality of boss portions protruding toward the gradually reducing diameter surface of the rotor, the end face of each of the boss portions being the rotor guide surface, and the outflow outlet may be located on the end face of at least one of the boss portions.

[0021] In this case, only the end face of each boss abuts against the gradually reduced diameter surface on the rotor side as the rotor guide surface, reducing the contact area between the gradually reduced diameter surface and the rotor guide surface, thereby reducing sliding resistance during rotor rotation and allowing for smoother rotor rotation.

[0022] (8) In the above aspect (7), the plurality of boss portions may be provided at equal intervals in the circumferential direction on the inner circumferential surface of the rotor accommodating portion.

[0023] In this case, the rotor guide surfaces come into uniform contact with the peripheral wall of the rotor (gradually reducing diameter surface) in the circumferential direction, so that the peripheral wall of the rotor is stably supported by the rotor guide surfaces.

[0024] (8) In the above aspect (5), the biasing member may be a coil spring, and a spring receiving member having a flat surface that abuts against the rotor may be disposed at the end of the coil spring on the rotor side.

[0025] In this case, the biasing member is a highly durable, simple-structured coil spring. The coil spring contacts the rotor via a spring receiving member whose contact surface with the rotor is flat, preventing the ends of the coil spring from interfering with the rotor rotation and from damaging the end surface of the rotor. As a result, the rotor can rotate smoothly and damage to the rotor can be prevented. [Effects of the Invention]

[0026] In one aspect of the present invention, the gradually reducing diameter surface of the rotor peripheral wall and the casing-side rotor guide surface are both inclined or curved radially inward from one axial end to the other axial end, and the outflow port is disposed on the casing-side rotor guide surface so as to face the gradually reducing diameter surface on the rotor side. This allows the casing-side rotor guide surface to stably and slidably support the rotor peripheral wall at all times. Furthermore, because the peripheral edge of the rotor guide surface at the location where the outflow port is disposed slidably abuts against the gradually reducing diameter surface on the rotor side, it is possible to omit a seal tube for connecting the outflow port to the communication port on the rotor peripheral wall and a biasing member for biasing the seal tube toward the rotor peripheral wall. Therefore, when the embodiment of the present invention is adopted, it is possible to reduce the number of components such as bearings, sealing cylinders, and biasing members, simplify the structure, and make the entire device smaller. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a block diagram of a cooling system according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the control valve according to the first embodiment. [Figure 3] FIG. 2 is an exploded perspective view of the control valve according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5] 5 is a cross-sectional view of a control valve according to a second embodiment, corresponding to FIG. 4. FIG. [Figure 6] 6 is a cross-sectional view of a control valve according to a third embodiment, corresponding to the cross section taken along line VI-VI in FIG. 2. FIG. [Figure 7] FIG. 10 is a cross-sectional view of a control valve according to a fourth embodiment, corresponding to FIG. 4. DETAILED DESCRIPTION OF THE INVENTION

[0028] Next, embodiments of the present invention will be described with reference to the drawings. In each embodiment described below, the same reference numerals will be used to designate corresponding components, and the description thereof may be omitted. In the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," "center," and "coaxial," not only strictly indicate such arrangements, but also indicate a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained.

[0029] [Cooling System 1] FIG. 1 is a block diagram of a cooling system 1. 1, the cooling system 1 is mounted on, for example, a vehicle. In this embodiment, the vehicle is not limited to one having an engine (internal combustion engine) as a vehicle drive source, but may also be an electrically powered vehicle. Electrically powered vehicles include electric vehicles, hybrid vehicles, plug-in hybrid vehicles, fuel cell vehicles, etc.

[0030] The cooling system 1 includes a heat generating unit 2, a heat dissipation unit 3, a water pump 4 (W / P), and a control valve 5 (EWV). In the cooling system 1, the coolant circulates between the heat generating unit 2 and the heat dissipation unit 3 by operating the water pump 4 and the control valve 5.

[0031] The heat generating part 2 is a part to be cooled by the coolant (a part to be absorbed by the coolant), and is a drive source of the vehicle and other heat generating parts. In the case of an electric vehicle, the heat generating part 2 includes, for example, a drive motor, a battery, a power conversion device, etc. The heat dissipation unit 3 is a component that dissipates heat from the coolant. In this embodiment, the heat dissipation unit 3 includes a radiator 8 (RAD) and a heater core 9 (HTR). Note that the heat dissipation unit 3 can be any component that has a temperature during normal operation that is lower than the temperature of the coolant after passing through the heat generation unit 2. As such a component, the heat dissipation unit 3 may be, for example, an EGR cooler that exchanges heat between EGR gas and the coolant, or a heat exchanger that exchanges heat between lubricating oil and the coolant.

[0032] The water pump 4, the heat generating unit 2, and the control valve 5 are connected in this order from upstream to downstream on the main flow path 10. In the main flow path 10, the operation of the water pump 4 causes the coolant to pass through the heat generating unit 2 and the control valve 5 in this order.

[0033] The main flow path 10 is connected to a radiator flow path 11 and an air conditioning flow path 12. A radiator 8 is provided in the radiator flow path 11. A portion of the radiator flow path 11 located upstream of the radiator 8 is connected to a control valve 5. A portion of the radiator flow path 11 located downstream of the radiator 8 is connected to a heat generating unit 2. In the radiator flow path 11, heat exchange between the coolant and outside air occurs in the radiator 8.

[0034] A heater core 9 is provided in the air conditioning flow path 12. A portion of the air conditioning flow path 12 located upstream of the heater core 9 is connected to a control valve 5. A portion of the air conditioning flow path 12 located downstream of the heater core 9 is connected to a heat generating unit 2. The heater core 9 is provided, for example, in a duct (not shown) of an air conditioner. In the air conditioning flow path 12, heat exchange occurs in the heater core 9 between the coolant and the conditioned air flowing through the duct.

[0035] In the cooling system 1, the coolant flowing into the control valve 5 by the operation of the water pump 4 is selectively supplied to one of the heat dissipation units 3 by the operation of the control valve 5. The coolant supplied to the heat dissipation unit 3 exchanges heat with the heat dissipation unit 3 as it passes through the heat dissipation unit 3. As a result, the coolant is cooled by the heat dissipation unit 3. The coolant that has passed through the heat dissipation unit 3 is supplied to the heat generation unit 2, and then exchanges heat with the heat generation unit 2 as it passes through the heat generation unit 2. In this way, in the cooling system 1, as the coolant circulates between the heat generation unit 2 and the heat dissipation unit 3, the coolant is cooled by the heat dissipation unit 3 while the heat generation unit 2 is cooled by the coolant. In this way, the cooling system 1 can control the heat generation unit 2 to a desired temperature.

[0036] [Control valve 5 of the first embodiment] Fig. 2 is a perspective view of the control valve 5, and Fig. 3 is an exploded perspective view of the control valve 5. Fig. 4 is a cross-sectional view of the control valve 5 taken along line IV-IV in Fig. 2. As shown in FIGS. 2 to 4, the control valve 5 includes a casing 21, a drive unit 22, and a rotor .

[0037] <Casing 21> The casing 21 includes a casing body 31 and an inlet joint 32. The casing body 31 is formed in a cylindrical shape with a bottom, having a bottom wall portion 31a and a peripheral wall portion 31b. In the following description, the direction along the axis O1 of the casing body 31 is simply referred to as the axial direction. The direction intersecting the axis O1 as viewed from the axial direction is referred to as the radial direction, and the direction around the axis O1 is referred to as the circumferential direction. In addition, the side of the casing body 31 opposite to the bottom wall portion 31a (opening side) in the axial direction is referred to as one end side, and the side of the bottom wall portion 31a is referred to as the other end side.

[0038] The bottom wall 31a of the casing body 31 protrudes radially outward in a rectangular shape so that the other axial end thereof substantially matches the outer shape of the drive unit 22, which will be described later. The drive unit 22 is placed on this portion and fixed by screws or the like. A through-hole 31c that passes through the bottom wall 31a in the axial direction is formed in a portion of the bottom wall 31a that is located on the axis O1. A shaft 23a of the rotor 23, which will be described later, is rotatably inserted into the through-hole 31c.

[0039] Two outlet ports 33A, 33B that protrude radially outward are formed in the peripheral wall portion 31b of the casing main body 31. The two outlet ports 33A, 33B extend in opposite directions about the axis O1. Each of the outlet ports 33A, 33B has an outlet 34 that communicates with the interior of the casing main body 31. One of the outlet ports 33A, 33B, is connected to the upstream side of either the radiator flow path 11 or the air conditioning flow path 12 shown in FIG. 1, and the other outlet port 33B is connected to the upstream side of the other of the radiator flow path 11 or the air conditioning flow path 12. In this embodiment, two outlet ports 33A, 33B are provided on the peripheral wall portion 31b of the casing body 31, but the number of outlet ports may be one or three or more depending on the flow path configuration of the cooling system 1. When there are three or more outlet ports, it is desirable to arrange the outlet ports evenly (at equal intervals) on the circumference of the peripheral wall portion 31b.

[0040] 4, the casing body 31 has an inner circumferential portion of the circumferential wall portion 31b that is closer to the bottom wall portion 31a as a rotor accommodating portion 35. The circumferential wall 23b of the rotor 23, which will be described later, is rotatably accommodated in the rotor accommodating portion 35.

[0041] The inner peripheral surface 35a of the rotor accommodating portion 35 is formed in a tapered shape such that the inner diameter gradually decreases at a constant rate from one end to the other end in the axial direction. In other words, this tapered shape gradually increases inward in the radial direction from one end to the other end in the axial direction. The outlets 34 of the two outlet ports 33A, 33B described above open to the inner peripheral surface 35a of the rotor accommodating portion 35. The peripheral wall 23b of the rotor 23, which will be described later, is rotatably supported on the tapered inner peripheral surface 35a of the rotor accommodating portion 35. In this embodiment, the inner peripheral surface 35a of the rotor accommodating portion 35 forms a rotor guide surface.

[0042] Furthermore, the region of the inner periphery of the peripheral wall 31b that is closer to one end in the axial direction than the rotor accommodating portion 35 is formed to have the same inner diameter as the maximum inner diameter of the rotor accommodating portion 35 (inner periphery 35a). This portion serves as a spring accommodating portion 36 that accommodates a coil spring 50, which will be described later. Furthermore, one axial end of this spring accommodating portion 36 opens to the outside of the casing main body 31, and coolant (fluid) that flows in from an inflow joint 32, which will be described later, flows through it.

[0043] An inflow joint 32 is attached to an end face on one axial end side of the casing body 31. The inflow joint 32 includes a joint cylinder portion 32a and a flange portion 32b. The joint cylindrical portion 32a is formed with an inlet 37 for allowing the coolant (fluid) to flow into the casing 21. The inlet 37 is connected to the downstream side of the heat-generating portion 2 of the main flow path 10 shown in FIG. 1. The flange portion 32b is formed at the axial end of the joint cylindrical portion 32a and protrudes radially outward. The flange portion 32b is placed on the end face of the casing main body 31 and is fixed to the end of the casing main body 31 by screws or the like with a packing 52 sandwiched therebetween. The inner diameter of the flange portion 32b is set smaller than the inner diameter of the spring accommodating portion 36 of the casing main body 31. Therefore, the inner peripheral edge of the flange portion 32b faces the inside of the end of the spring accommodating portion 36 of the casing main body 31. The inflow joint 32 (flange portion 32b) may be attached to the opening end face of the inflow port 37 by welding (for example, vibration welding or the like).

[0044] <Drive unit 22> The drive unit 22 incorporates a motor, a reduction mechanism, a control board, etc. (not shown). An output shaft 22a protrudes from the surface of the drive unit 22 that is attached to the casing 21. The output shaft 22a is engaged with a shaft portion 23a of the rotor 23 that penetrates the bottom wall portion 31a of the casing main body 31 so as to be able to transmit rotation. Note that the shaft portion 23a of the rotor 23 and the output shaft 22a are capable of relative axial displacement due to spline engagement.

[0045] <Rotor 23> The rotor 23 is rotatably housed inside the casing 21. The rotor 23 housed in the casing 21 is rotatable about an axis O1. The rotor 23 includes a shaft portion 23a, a peripheral wall 23b, and a bottom wall 23c. The shaft portion 23a is inserted into a through-hole 31c in the bottom wall portion 31a of the casing body 31, and the peripheral wall 23b is housed in a rotor housing portion 35 of the casing body 31. The bottom wall 23c closes the other axial end of the peripheral wall 23b. The shaft portion 23a protrudes coaxially with the peripheral wall 23b from the center of the other axial end of the bottom wall 23c. An opening 23d is provided on one axial end side of the peripheral wall 23b.

[0046] The rotor 23 housed in the casing 21 is disposed coaxially with the axis O1 of the casing 21. Therefore, the rotation axis of the rotor 23 coincides with the axis O1 of the casing 21. The shaft portion 23a penetrates the bottom wall portion 31a through the through-hole 31c. An outer spline 23s that is spline-engaged with the output shaft 22a of the drive unit 22 is formed on the other axial end of the shaft portion 23a. The shaft portion 23a is spline-engaged with the output shaft 22a of the drive unit 22 on the outside of the bottom wall portion 31a.

[0047] The peripheral wall 23b of the rotor 23 has a tapered shape (frustoconical shape) in which the outer diameter gradually decreases at a constant rate from one end to the other end in the axial direction. In this embodiment, the outer peripheral surface of the peripheral wall 23b forms a gradually decreasing diameter surface 38. When the peripheral wall 23b is housed in the rotor housing portion 35 of the casing body 31, the gradually decreasing diameter surface 38 slidably abuts against the tapered inner peripheral surface 35a of the rotor housing portion 35. The rotor 23 is rotatably supported by the inner peripheral surface 35a of the rotor housing portion 35.

[0048] In this embodiment, the diameter reduction ratio of the outer diameter of the gradually reducing surface 38 (the diameter reduction ratio from one end side to the other end side in the axial direction) is set to be the same as the diameter reduction ratio of the inner circumferential surface 35a on the casing 21 side. Therefore, when the circumferential wall 23b of the rotor 23 expands and contracts due to heat, the circumferential wall 23b is smoothly guided by the inner circumferential surface 35a and displaces in the axial direction in accordance with the change in the outer diameter of the circumferential wall 23b (the gradual reducing surface 38). The gradually decreasing diameter surface 38 and the inner peripheral surface 35a on the casing 21 side do not necessarily have to be tapered, but may have a shape in which the diameter decreases while gradually curving from one end side to the other end side in the axial direction.

[0049] Two communication ports 39A, 39B that radially penetrate the peripheral wall 23b are formed in the peripheral wall 23b of the rotor 23. When the rotor 23 is housed in the rotor housing portion 35 of the casing 21, the two communication ports 39A, 39B are formed at positions that are approximately at the same height (approximately in the same axial region) as the two outlets 34 that face the inner peripheral surface 35a of the rotor housing portion 35. Each of the communication ports 39A, 39B communicates with one of the outlets 34 when the rotor 23 is in a predetermined rotational position. The communication ports 39A, 39B on the rotor 23 side and the outlet port 34 on the casing 21 side are set in positions, sizes and shapes such that they are reliably connected at a predetermined rotational position even when the peripheral wall 23b of the rotor 23 is displaced in the axial direction due to thermal expansion and contraction. In this embodiment, two communication ports 39A and 39B are formed in the peripheral wall 23b of the rotor 23, but the number of communication ports formed in the peripheral wall 23b may be one, or three or more.

[0050] Furthermore, the peripheral wall 23b of the rotor 23 in this embodiment is formed with a constant thickness throughout the entire circumferential and axial directions. Therefore, when molding the rotor 23, the parting surface of the mold can be positioned at the other axial end of the peripheral wall. In this case, the parting surface is perpendicular to the axial direction, and two molds with their parting surfaces butted together can be removed along the axial direction. The rotor 23 formed using such a mold does not have a parting line on the outer peripheral surface of the peripheral wall 23b. Therefore, a parting line on the outer peripheral surface of the rotor 23 can be prevented from causing coolant leakage at the abutment surface between the outer peripheral surface of the rotor 23 and the inner peripheral surface 35a on the casing 21 side.

[0051] An opening 23d at one axial end of the peripheral wall 23b communicates with an inlet 37 of the inlet joint 32 through a spring accommodating portion 36 of the casing body 31. Therefore, the inlet 37 of the casing 21 communicates with an internal space K1 of the rotor 23 surrounded by the peripheral wall 23b and the bottom wall 23c. The coolant (fluid) that flows into the internal space K1 of the rotor 23 from the inlet 37 flows out through the communication port 39A or 39B to the outlets 34 of the outlet ports 33A, 33B, depending on the rotational position of the rotor 23.

[0052] <Seal structure of rotor 23> As shown in FIG. 4, a seal accommodating portion 66 is formed in the bottom wall portion 31a of the casing 21 at a position facing the outer surface (the surface on the other axial end side) of the bottom wall 23c of the rotor 23. The seal accommodating portion 66 is a recess that opens toward one axial end and has a through-hole 31c communicating with the center of the bottom. An annular seal member 67 is fitted into the seal accommodating portion 66. The seal member 67 is an annular member that is formed in a U-shape in cross section and is mainly made of an elastic material. The seal member 67 provides a seal between the outer peripheral surface of the shaft portion 23a and the inner peripheral surface of the seal accommodating portion 66 within the seal accommodating portion 66.

[0053] An annular wall 68 and an annular recess 69 are formed in the bottom wall 31a at a position radially outside the seal accommodating portion 66. The annular wall 68 is disposed radially inside the annular recess 69, separating the seal accommodating portion 66 from the recess 69. The protruding end of the annular wall 68 is disposed close to the outer surface of the bottom wall 23c of the rotor. The recess 69 forms a stagnation area for the coolant to capture contaminants contained in the coolant before they enter the seal accommodating portion 66. The inner surface of the recess 69 facing radially inward is defined by the inner circumferential surface of the peripheral wall 31b. On the other hand, the inner surface of the recess 69 facing radially outward is defined by the outer circumferential surface of the annular wall 68.

[0054] <Rotor 23 Energizing Structure> As shown in FIG. 4, a coil spring 50 made of a thin plate material is accommodated in the spring accommodating portion 36 of the casing body 31 together with a ring-shaped sheet-like spring receiving member 51. The coil spring 50 has approximately the same outer diameter as one axial end face of the peripheral wall 23b of the rotor 23. The spring receiving member 51 is disposed at the other axial end face of the coil spring 50. The end face of the spring receiving member 51 facing the rotor 23 is formed flat. When the coil spring 50 and the spring receiving member 51 are accommodated in the spring accommodating portion 36, the spring receiving member 51 abuts against the end face of the peripheral wall 23b of the rotor 23. At this time, the local end face of the coil spring 50 abuts against the inner peripheral edge of the flange portion 32b of the inlet joint 32. The coil spring 50 is a compression spring that urges the rotor 23 toward the other end in the axial direction while housed in the spring housing portion 36. The urging force of the coil spring 50 weakly presses the gradually reducing diameter surface 38 of the peripheral wall 23b of the rotor 23 against the inner peripheral surface 35a (rotor guide surface) on the casing 21 side.

[0055] Furthermore, the flow of coolant flowing from the inlet 37 of the casing 21 into the internal space K1 of the rotor 23 hits the peripheral wall 23b and bottom wall 23c of the rotor 23, thereby pressing the rotor 23 toward the other end in the axial direction. Therefore, the flow of coolant flowing into the internal space K1 of the rotor 23 presses the gradually reducing diameter surface 38 of the peripheral wall 23b of the rotor 23 against the inner peripheral surface 35a (rotor guide surface) on the casing 21 side with a weak force.

[0056] <Operation method of control valve 5> Next, we will explain how the above-mentioned control valve 5 operates. In the following explanation, it is assumed that the outlet 34 of one outlet port 33A of the casing 21 is connected to the radiator flow path 11, and the outlet 34 of the other outlet port 33B is connected to the air conditioning flow path 12. As shown in Fig. 1, in the main flow path 10, the coolant pumped out by the water pump 4 undergoes heat exchange in the heat generating unit 2 and then flows toward the control valve 5. After passing through the heat generating unit 2 in the main flow path 10, the coolant flows into the internal space K1 through the inlet 37 of the inlet joint 32 shown in Fig. 4. The coolant that has flowed into the internal space K1 fills the entire interior of the casing body 31 through the communication ports 39A and 39B, the gap between the rotor 23 and the casing 21, etc.

[0057] When the communication ports 39A, 39B of the rotor 23 do not overlap with the outlets 34 of any of the outlet ports 33A, 33B when viewed from the radial direction, communication between the internal space K1 of the rotor 23 and the outlets 34 of the outlet ports 33A, 33B is blocked (blocked state). In the blocked state, the coolant in the internal space K1 is restricted from flowing into the outlets 34 through the communication ports 39A, 39B.

[0058] When it is desired to supply coolant to the radiator 8, for example, the communication port 39A and the outlet 34 of one of the outlet ports 33A are communicated with each other. Specifically, the drive unit 22 is driven to rotate the rotor 23 about the axis O1. At this time, the rotor 23 rotates about the axis O1 while the gradually reducing diameter surface 38 of the peripheral wall 23b slides on the inner circumferential surface 35a (rotor guide surface) of the casing main body 31. Then, the communication port 39A overlaps with the outlet 34 of one of the outlet ports 33A as viewed from the radial direction, thereby communicating the communication port 39A with the outlet 34 of one of the outlet ports 33A (communicating state). In the communicating state, the coolant in the internal space K1 flows out through the communication port 39A to the outlet 34. The coolant flowing out of the outlet 34 is distributed to the radiator flow path 11 as shown in FIG. 1 . The coolant distributed to the radiator flow path 11 passes through the radiator 8, then returns to the main flow path 10, and flows into the control valve 5 again.

[0059] On the other hand, when it is desired to supply coolant to the heater core 9, for example, the communication port 39B is connected to the outlet 34 of the other outlet port 33B in the same manner as described above. As a result, the coolant flowing out from the internal space K1 flows into the outlet 34 of the other outlet port 33B and is distributed to the air conditioning flow path 12. In this way, in the control valve 5 of this embodiment, communication between the internal space K1 and each outlet 34 through the communication ports 39A, 39B is switched on and off depending on the rotational position of the rotor 23. This allows the coolant to be distributed to desired flow paths.

[0060] <Effects of the first embodiment> As described above, in the control valve 5 of this embodiment, the peripheral wall 23b of the rotor 23 is provided with a gradually reducing diameter surface 38 whose outer diameter gradually decreases from one end to the other end in the axial direction, and the rotor accommodating portion 35 on the casing 21 side is provided with an inner peripheral surface 35a (rotor guide surface) whose radially inward projection gradually increases from one end to the other end in the axial direction. The inner peripheral surface 35a (rotor guide surface) of the rotor accommodating portion 35 slidably abuts on the gradually reducing diameter surface 38 on the rotor 23 side, and the outlet 34 is formed so as to face the gradually reducing diameter surface 38. With this configuration, when the outer diameter of the peripheral wall 23b of the rotor 23 expands or contracts due to heat, the rotor 23 is displaced in the axial direction on the inner peripheral surface 35a (rotor guide surface) of the rotor accommodating portion 35 in accordance with the increase or decrease in the outer diameter of the peripheral wall 23b. Therefore, regardless of the expansion and contraction of the peripheral wall 23b due to heat, the gradually reducing diameter surface 38 of the rotor 23 is stably supported on the inner peripheral surface 35a of the rotor accommodating portion 35 so as to be freely slidable. Furthermore, in this configuration, the peripheral portion of the inner surface 35a of the rotor accommodating section 35 at the location of the outlet 34 is in sliding contact with the gradually reducing diameter surface 38 on the rotor 23 side, so that it is possible to omit a sealing tube for connecting the outlet 34 to the communication ports 39A, 39B in the peripheral wall 23b of the rotor 23 and a biasing member for biasing the sealing tube toward the peripheral wall of the rotor 23. Therefore, when the control valve 5 of this embodiment is adopted, it is possible to reduce the number of components such as bearings, sealing cylinders, and biasing members, simplify the structure, and make the entire device smaller.

[0061] Furthermore, in the control valve 5 of this embodiment, the gradually reducing diameter surface 38 on the rotor 23 side and the inner circumferential surface 35a of the rotor accommodating portion 35 on the casing 21 side are both tapered surfaces whose inclination changes at a constant rate from one end to the other end in the axial direction. Therefore, even when the circumferential wall 23b of the rotor 23 expands and contracts due to heat, causing the rotor 23 to displace in the axial direction, the gradually reducing diameter surface 38 and the inner circumferential surface 35a of the rotor accommodating portion 35 can stably abut over a wide area. Therefore, when this configuration is adopted, it is possible to stabilize the operation of the rotor 23 and also to prevent unnecessary internal leakage of the coolant.

[0062] Furthermore, in the control valve 5 of this embodiment, an opening 23d is provided at one end side of the peripheral wall 23b of the rotor 23, the other end side of the peripheral wall 23b of the rotor 23 is closed by a bottom wall 23c, the opening 23d is in communication with an inlet 37 of the casing 21, and an outlet 34 is formed on the inner peripheral surface of the rotor accommodating section 35 on the casing 21 side. Therefore, when the coolant flows into the casing 21 from the inlet 37, the coolant flows into the peripheral wall 23b through the opening 23d of the rotor 23. At this time, the rotor 23 is pressed toward the other end in the axial direction by the pressure of the coolant, and this component force acts as a pressing force that presses the gradually reducing diameter surface 38 of the rotor 23 against the inner peripheral surface 35a on the casing 21 side. As a result, the gradually reducing diameter surface 38 of the rotor 23 is pressed against the peripheral edge of the outlet 34 on the inner circumferential surface 35a on the casing 21 side, and when the communication ports 39A, 39B of the rotor 23 are in communication with the outlet 34, leakage of the coolant from the peripheral edge of the outlet 34 is suppressed. In addition, when the communication ports 39A, 39B of the rotor 23 are not in communication with the outlet 34, leakage of the coolant to the outlet 34 is suppressed. Therefore, when this configuration is adopted, the gradually reducing diameter surface 38 on the rotor 23 side is always in stable contact with the inner circumferential surface 35a on the casing 21 side, thereby suppressing unnecessary internal leakage of coolant.

[0063] Furthermore, in the control valve 5 of this embodiment, a coil spring 50 (biasing member) that biases the rotor 23 toward the other end in the axial direction is provided between the casing 21 and the rotor 23. Therefore, a component force of the coil spring 50 that biases the rotor 23 toward the other end in the axial direction acts as a force that presses the gradually reducing diameter surface 38 of the rotor 23 against the inner circumferential surface 35a on the casing 21 side. Therefore, when this configuration is adopted, the gradually reducing diameter surface 38 on the rotor 23 side is always in stable contact with the inner surface 35a on the casing 21 side, thereby further suppressing unnecessary internal leakage of coolant.

[0064] Furthermore, in the control valve 5 of this embodiment, the inner peripheral surface 35a of the rotor accommodating portion 35 is formed in an annular shape so as to surround the circumferential area of ​​the gradually reducing diameter surface 38 of the rotor 23. This makes it possible to maintain the rotor 23 in a stable position during rotation, etc. Therefore, when this configuration is adopted, the operation of the rotor 23 can be made more stable.

[0065] Furthermore, in the control valve 5 of this embodiment, a spring receiving member 51 with a flat surface that abuts against the rotor 23 is attached to the rotor 23-side end face of the coil spring 50 (biasing member) that biases the rotor 23 toward the other end in the axial direction. In this case, even though the coil spring 50, which is highly durable and has a simple structure, is used as the biasing member, the biasing force of the coil spring 50 acts on the rotor 23 via the spring receiving member 51, so that the end of the coil spring 50 can be prevented from interfering with the rotation of the rotor 23 when the rotor 23 rotates, and further, the end of the coil spring can be prevented from damaging the end face of the rotor 23. Therefore, when this configuration is adopted, the rotor 23 can be smoothly rotated, and damage to the rotor 23 can be prevented in advance.

[0066] [Control valve 105 of the second embodiment] FIG. 5 is a cross-sectional view of the control valve 105 of this embodiment, corresponding to FIG. 4 of the first embodiment. The control valve 105 of this embodiment has the same basic configuration as the above-described embodiment, but differs from the above-described embodiment in the structure of a portion of the inflow joint 32. That is, the inflow joint 32 has a cylindrical wall 32e extending axially within the casing body 31 and into the opening 23d of the peripheral wall 23b of the rotor 23. The inflow port 37 of the casing 21 is formed across the cylindrical joint portion 32a of the inflow joint 32 and the cylindrical wall 32e.

[0067] <Effects of the second embodiment> The control valve 105 of this embodiment has the same basic configuration as the above-described embodiment, and therefore can obtain the same basic effects as the above-described embodiment. Furthermore, in the control valve 105 of this embodiment, the inflow joint 32 is provided with a cylindrical wall 32e that extends into the opening 23d of the peripheral wall 23b of the rotor 23, and an inflow port 37 is formed in the cylindrical wall 32e of the inflow joint 32. Therefore, when the coolant (fluid) flows from the inflow port 37 into the peripheral wall 23b of the rotor 23, the flow of the fluid is less likely to directly hit the end of one axial end of the peripheral wall 23b or its peripheral area (the wall of the spring accommodating portion 36 and the coil spring 50). Therefore, when the configuration of this embodiment is adopted, pressure loss of the coolant flowing into the peripheral wall 23b of the rotor 23 can be suppressed.

[0068] [Control valve 205 of the third embodiment] FIG. 6 is a cross-sectional view of the control valve 205 of this embodiment, which corresponds to the cross section taken along line VI-VI of the first embodiment. The rotor accommodating portion 35 of the casing 21 in the first embodiment has a tapered inner circumferential surface 35a such that the inner diameter gradually decreases from one axial end to the other axial end. In contrast, the inner circumferential surface 35a of the rotor accommodating portion 35 in the present embodiment has a constant inner diameter or an inner diameter that gradually decreases from one axial end to the other axial end. Furthermore, boss portions 55 are formed on the inner circumferential surface 35a of the rotor accommodating portion 35 at portions where the outlets 34 of the outlet ports 33A, 33B open, so as to surround the outlets 34. Each boss portion 55 protrudes radially inward toward the gradually decreasing diameter surface 38 of the rotor 23.

[0069] The protruding end face 55e of each boss portion 55 slidably contacts the gradually reduced diameter surface 38 of the rotor 23. The end face 55e of each boss portion 55 is formed to have a shape complementary to a portion of the gradually reduced diameter surface 38. Specifically, the end face 55e of the boss portion 55 has an arc-shaped cross section perpendicular to the axis O1, and the inner diameter of the arc gradually decreases from one end to the other axial end. In other words, the amount by which the end face 55e of the boss portion 55 protrudes radially inward gradually increases from one end to the other axial end. In this embodiment, the end faces 55e of the plurality of boss portions 55 form rotor guide surfaces on the casing 21 side.

[0070] In this embodiment, the boss portions 55 are formed on the inner circumferential surface 35a of the rotor accommodating portion 35 at portions where the outlets 34 of the two outlet ports 33A, 33B open, but if there are three or more outlet ports, the number of boss portions 55 can be increased to match the number of outlet ports (outlet ports). In this case, it is desirable to arrange the boss portions 55 evenly around the periphery of the inner circumferential surface 35a. The number of boss portions 55 may also be greater than the number of outflow ports (outlet ports). In this case, some of the boss portions 55 will not have an outflow port. For example, if there is one outflow port (outlet), one or more boss portions 55 without an outflow port may be provided, and all of the boss portions may be evenly spaced circumferentially around the inner circumferential surface 35a. This allows the end faces 55e (rotor guide surfaces) of the boss portions 55 to maintain a good balance in supporting the rotor 23.

[0071] <Effects of the third embodiment> The control valve 205 of this embodiment has a basic configuration that is almost the same as that of the first embodiment, and therefore can obtain the same basic effects as those of the first embodiment. In the control valve 205 of this embodiment, only the end face 55e of each boss portion 55 formed on the inner circumferential surface 35a of the rotor accommodating portion 35 abuts against the gradually reducing diameter surface 38 on the rotor 23 side as the rotor guide surface. Therefore, the contact area between the gradually reducing diameter surface 38 and the rotor guide surface is smaller than those in the first and second embodiments. Therefore, when the control valve 205 of this embodiment is employed, the sliding resistance during rotation of the rotor 23 can be reduced, and the rotor 23 can be rotated more smoothly.

[0072] In the first, second, and third embodiments described above, the inlet 37 faces in the axial direction and the outlet 34 faces in the radial direction. However, the present invention is not limited to this configuration. For example, the outlet may face in the axial direction and the inlet may face in the radial direction, or both the inlet and the outlet may face in the radial direction. In this case, the outlet may communicate with the internal space within the rotor, and the inlet may be opened and closed by a communication port in the peripheral wall (gradually tapering surface) of the rotor.

[0073] [Control valve 305 of the fourth embodiment] FIG. 7 is a cross-sectional view of the control valve 305 of this embodiment, corresponding to FIG. 4 of the first embodiment. The control valve 305 of this embodiment is not provided with a biasing member such as a coil spring for biasing the rotor 323 toward the other end in the axial direction. As in the above-described embodiment, the rotor 323 includes a shaft portion 23a, a peripheral wall 23b, and a bottom wall 23c. However, the outer peripheral surface of the peripheral wall 23b is not tapered over the entire axial direction, but is provided with a straight portion 23e of a constant outer diameter at one axial end.

[0074] Additionally, an annular recess 60 is formed adjacent to one axial end of the rotor accommodating portion 35 of the casing body 31, opening radially inward and toward one axial end. An annular groove 61 opening toward the other axial end is formed on the end surface of the flange portion 32b of the inlet joint 32 facing the inside of the casing 21. The radially inward circumferential surface of the recess 60 of the casing body 31 is continuous with the outer circumferential surface of the annular groove 61 of the inlet joint 32. The recess 60 and the annular groove 61 form an annular end receiving space K2, with portions of the inner circumferential wall and bottom wall (the wall located on the other axial end side) missing. The straight portion 23e at the end of the circumferential wall 23b of the rotor 23 is accommodated in this end receiving space K2 so as to be movable axially back and forth. A gap d is secured between the end 23f of the straight portion 23e accommodated in the end receiving space K2 and the bottom surface 61e of the annular groove 61. This gap d is a gap that allows the peripheral wall 23b (straight portion 23e) to displace toward one end in the axial direction when the rotor 323 displaces toward one end in the axial direction due to thermal expansion of the peripheral wall 23b of the rotor 323.

[0075] Although the control valve 305 of this embodiment does not include a biasing member for biasing the rotor 323 toward the other end in the axial direction, the flow of the coolant (fluid) flowing in from the inlet 37 presses the rotor 323 toward the other end in the axial direction. As a result, the gradually reducing diameter surface 38 of the rotor 323 is pressed against the tapered inner circumferential surface 35a on the casing 21 side. Therefore, even if the rotor 323 expands and contracts due to heat, it is slidably supported on the inner circumferential surface 35a on the casing 21 side.

[0076] <Effects of the Fourth Embodiment> The control valve 305 of this embodiment has a basic configuration that is almost the same as that of the first embodiment, and therefore can obtain the same basic effects as those of the first embodiment. However, the control valve 305 of this embodiment does not have a biasing member for biasing the rotor 323 toward the other end in the axial direction, which allows for a further reduction in the number of parts and a shortened axial length of the control valve 305.

[0077] Furthermore, in the control valve 305 of this embodiment, the bottom surface 61e of the annular groove 61 faces, across a small gap d, the end 23f of the peripheral wall 23b (straight portion 23e) of the rotor 323. Therefore, the bottom surface 61e of the annular groove 61 can suppress excessive axial displacement and unnecessary rattle of the rotor 323 when the rotor 323 is not operating.

[0078] [Other embodiments] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Addition, omission, substitution, and other modifications of the configuration are possible without departing from the spirit of the present invention. The present invention is not limited by the above description, but is limited only by the appended claims. For example, in the above embodiment, the control valve 5 is mounted in the cooling system 1 of the vehicle, but the present invention is not limited to this configuration and may be mounted in other systems. In the above-described embodiment, the coolant flowing into the control valve 5 is distributed to the radiator flow path 11 and the air conditioning flow path 12, but the present invention is not limited to this configuration. The control valve 5 may be configured to distribute the coolant flowing into the control valve 5 to multiple flow paths.

[0079] In the first and second embodiments described above, the coil spring 50 made of a plate-shaped material is used as the biasing member that biases the rotor 23 toward the other end in the axial direction, but this configuration is not limiting. Various other members, such as a disc spring or a rubber-like elastic member, can also be used as the biasing member. [Explanation of symbols]

[0080] 5,105,205,305...Control valve 21...Casing 23...Rotor 23b…peripheral wall 23c…Bottom wall 23d…Opening 32e...Cylindrical wall 34…Outlet 35...Rotor housing 35a...inner surface (rotor guide surface) 37...Inlet 38... Gradual diameter reduction surface 39A, 39B…Communication port 50... Coil spring (biasing member) 51...Spring receiving member 55...Boss section 55e...End face (rotor guide surface)

Claims

1. a casing having an inlet through which a fluid flows in from the outside and an outlet through which the fluid flows out to the outside; a rotor having a peripheral wall formed with a communication port penetrating in a radial direction, the rotor being rotatably accommodated inside the casing, and switching between a communication state in which the inlet and the outlet are communicated through the communication port and a blocking state in which the communication between the inlet and the outlet is blocked in an area of ​​the peripheral wall that does not have the communication port, depending on a rotation position; the peripheral wall of the rotor has an outer diameter that gradually decreases from one end side to the other end side in an axial direction along a rotation axis of the rotor, and includes a gradually decreasing diameter surface on which the communication port is formed, a rotor accommodating portion of the casing that accommodates the rotor is an inner surface of the casing that is made of the same material as the casing, and the rotor accommodating portion includes a rotor guide surface that gradually increases in radially inward protrusion amount from the one end side toward the other end side in the axial direction, and the radially inner end surface slidably abuts on the gradually reducing diameter surface of the peripheral wall; the outlet is disposed on a part of the rotor guide surface so as to face the gradually reducing diameter surface of the rotor, The rotor is an opening is provided at the one end side of the peripheral wall in the axial direction, and a bottom wall that closes the other end side in the axial direction; a shaft portion projecting coaxially with the peripheral wall at a center of the other end of the bottom wall in the axial direction; Equipped with The opening is in communication with the inlet. A control valve characterized by:

2. the gradually decreasing diameter surface is formed by a tapered surface whose outer diameter gradually decreases at a constant rate from the one end side toward the other end side in the axial direction, The rotor guide surface is formed by a tapered surface whose radially inward projection gradually increases from the one end side toward the other end side in the axial direction at the same constant rate as the gradually decreasing diameter surface.

2. The control valve of claim 1.

3. The inlet is formed in a cylindrical wall extending into the opening along the axial direction of the peripheral wall.

2. The control valve of claim 1.

4. A biasing member is disposed between the casing and the rotor, and biases the rotor toward the other end in the axial direction.

2. The control valve of claim 1.

5. The rotor guide surface is formed in an annular shape in the rotor accommodating portion so as to surround the circumferential area of ​​the gradually decreasing diameter surface.

5. The control valve according to claim 1, wherein the control valve is a valve having a first end and a second end.

6. A casing having an inlet through which a fluid flows in from the outside and an outlet through which the fluid flows out to the outside; a rotor having a peripheral wall formed with a communication port penetrating in a radial direction, the rotor being rotatably accommodated inside the casing, and switching between a communication state in which the inlet and the outlet are communicated through the communication port and a blocking state in which the communication between the inlet and the outlet is blocked in an area of ​​the peripheral wall that does not have the communication port, depending on a rotation position; the peripheral wall of the rotor has an outer diameter that gradually decreases from one end side to the other end side in an axial direction along a rotation axis of the rotor, and includes a gradually decreasing diameter surface on which the communication port is formed, a rotor accommodating portion of the casing that accommodates the rotor has a radially inward protrusion amount that gradually increases from the one end side toward the other end side in the axial direction, and the rotor accommodating portion includes a rotor guide surface whose radially inner end surface slidably contacts the gradually reducing diameter surface of the peripheral wall, the outlet is disposed on a part of the rotor guide surface so as to face the gradually reducing diameter surface of the rotor, The rotor is an opening is provided at the one end side of the peripheral wall in the axial direction, and a bottom wall that closes the other end side in the axial direction; a shaft portion projecting coaxially with the peripheral wall at a center of the other end of the bottom wall in the axial direction; Equipped with the opening communicates with the inlet; a plurality of bosses projecting toward the gradually reducing diameter surface of the rotor are provided on an inner peripheral surface of the rotor accommodating portion; The end surface of each of the boss portions serves as the rotor guide surface, and the outflow port is disposed on the end surface of at least one of the boss portions. Control valve.

7. The plurality of boss portions are provided at equal intervals in the circumferential direction on the inner peripheral surface of the rotor accommodating portion.

7. The control valve of claim 6.

8. The biasing member is a coil spring, and a spring receiving member having a flat contact surface with the rotor is disposed at the end of the coil spring on the rotor side.

5. The control valve of claim 4.

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