JP7037973B2 - Control valve and its manufacturing method - Google Patents

Description

The present invention relates to a control valve and a method for manufacturing the same.

As a conventional control valve, for example, the one described in the following Patent Document 1 is known.

This control valve is configured by rotatably accommodating a cylindrical valve body inside the housing. Then, the valve body is rotationally controlled by an electric motor, and the communication port that opens to the side of the housing overlaps with the opening that opens to the side of the valve body, so that the cooling introduced to the inner peripheral side of the valve body is introduced. Water is supplied to a given device through the opening of the valve body.

JP-A-2017-166569

However, in the conventional control valve, due to the die-cutting when forming the opening of the valve body, the inner peripheral surface of at least one end side in the circumferential direction of the opening is directed from the outer peripheral side to the inner peripheral side. The inner diameter of the opening is narrowed. As a result, an edge protruding inward is formed on the inner peripheral side edge on the one end side in the circumferential direction of the opening, and this edge causes a pressure loss when the cooling water flows out from the opening. was there.

The present invention has been devised in view of such technical problems, and provides a control valve capable of suppressing a pressure loss when a fluid flows out from an opening of a valve body and a method for manufacturing the same. I am aiming.

As one aspect of the present invention, among the openings of the valve body, a first inclined surface inclined in a direction in which the inner diameter increases toward the inner peripheral side is formed at the opening edge on one end side in the circumferential direction. At the opening edge on the other end side, a second inclined surface inclined in a direction in which the inner diameter increases toward the inner peripheral side is formed by the first groove portion formed along the axial direction on the inner peripheral surface of the valve body. There is.

Further, the control valve according to the present invention is arranged in a first molding mold having a mold insertion hole diagonally penetrating the peripheral wall and inside the first molding mold, and is arranged in the outer peripheral portion in the direction of the rotation axis of the valve body. A second molding die having a ridge that overlaps the hole edge of the die insertion hole along the line, and a second molding die that is inserted into the die insertion hole from the outer peripheral side of the first molding die and formed between the first molding die and the second molding die. It is manufactured with a valve body molding die including a third molding die penetrating the cavity.

The control valve manufacturing process according to the present invention includes a resin filling step of filling the cavity of the valve body molding die with resin, and a second opening portion by removing the third molding die after the resin filling step. After the first inclined surface forming step of forming the first inclined surface in the second opening and the first inclined surface forming step with the detachment of the third molding die, the second forming die is detached. The second inclined surface forming step of forming the first opening and forming the second inclined surface in the second opening by removing the ridges with the detachment of the second molding die. included.

According to the present invention, it is possible to suppress the pressure loss when the fluid flows out from the opening of the valve body.

It is a block diagram which showed the structure of the circulation circuit of the cooling water for automobiles to which the control valve which concerns on this invention is applied. It is an exploded perspective view of the control valve which concerns on this invention. It is a top view of the control valve shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a cross-sectional view taken along the line BB of FIG. The first embodiment of the present invention is shown, (a) is a perspective view of a valve body, (b) is a sectional view taken along line CC of FIG. It is a line sectional view. (A) is a vertical cross-sectional view showing a mold closed state of a valve body molding die, and (b) is a sectional view taken along line EE of the same figure (a). (A) is a vertical cross-sectional view showing a resin filling process, and (b) is a sectional view taken along line FF of the same figure (a). (A) is a vertical cross-sectional view showing the first inclined surface forming step, and (b) is a GG line cross-sectional view of the same figure (a). (A) is a vertical cross-sectional view showing a second inclined surface forming step, and (b) is a cross-sectional view taken along the line HH of the same figure (a). A second embodiment of the present invention is shown, (a) is a perspective view of a valve body, and (b) is a sectional view taken along line I-I of the same figure (a). (A) is a sectional view taken along line JJ of FIG. 11 (b), and FIG. 11 (b) is a sectional view taken along line KK of FIG. 11 (b). The third embodiment of the present invention is shown, (a) is a perspective view of a valve body, (b) is a sectional view taken along line LL of FIG. It is a line sectional view.

Hereinafter, embodiments of the control valve according to the present invention will be described with reference to the drawings. In the following embodiment, an example will be described in which the control valve according to the present invention is applied to a circulation system of cooling water for automobiles (hereinafter, simply abbreviated as "cooling water") similar to the conventional one.

(Construction of cooling water circulation circuit)
FIG. 1 shows a block diagram showing a configuration of a cooling water circulation circuit to which the control valve CV according to the present invention is applied.

The control valve CV is arranged on the side of the engine EG (specifically, a cylinder head (not shown)). The control valve CV is arranged between the heater HT, the oil cooler OC, and the radiator RD, as shown in FIG. The heater HT is a heating heat exchanger that exchanges heat to generate hot air from an air conditioner (not shown). The oil cooler OC cools the oil for lubricating the sliding portion inside the engine EG. The radiator RD cools the cooling water used for cooling the engine EG.

Here, the reference numeral WP in the figure is a water pump used for circulation of cooling water. Further, the reference numeral WT is a water temperature sensor used for driving control of the control valve CV, and the control valve CV is driven and controlled according to the detection result of the water temperature sensor WT. Further, the reference numeral TC is a throttle chamber that controls the flow rate of air mixed with the fuel burned in the engine EG, and the reference numeral EC is an EGR cooler that cools the exhaust gas after combustion of the engine EG.

Specifically, the cooling water discharged from the water pump WP is guided to the control valve CV through the introduction passage L0. Then, the rotor RT in the control valve CV is driven and controlled based on the operating state of the engine EG such as the detection result by the water temperature sensor WT. As a result, the cooling water guided to the control valve CV via the introduction passage L0 is distributed to the heater HT, the oil cooler OC, and the radiator RD, respectively, via the first to third pipes L1 to L3.

Further, the control valve CV is provided with a bypass passage BL for directly guiding the cooling water from the engine EG to the throttle chamber TC by bypassing the introduction passage L0. As a result, the cooling water guided to the control valve CV via the bypass passage BL is constantly supplied to the throttle chamber TC. The cooling water supplied to the throttle chamber TC is guided to the EGR cooler EC like the heater HT, and is returned to the engine EG side via the EGR cooler EC and the water pump WP.

In this way, the control valve CV is applied as a so-called 1in-3out type distribution device, distributes the cooling water flowing in from the introduction passage L0 to the first to third pipes L1 to L3, and cools at the time of distribution. Control the flow rate of water.

(Structure of control valve)
FIG. 2 shows an exploded perspective view of the control valve CV according to the present invention. Further, FIG. 3 shows a plan view of the control valve CV showing a state in which the control valve CV shown in FIG. 2 is assembled. In the description of this figure, the direction parallel to the rotation axis Z of the drive shaft 2 is the "axial direction", the direction orthogonal to the rotation axis Z of the drive shaft 2 is the "radial direction", and the circumference of the rotation axis Z of the drive shaft 2 The direction of is described as "circumferential direction". Further, the "axial direction" will be described with the upper side in FIG. 2 as the "one end side" and the lower side as the "other end side".

As shown in FIGS. 2 and 3, the control valve CV is housed in a tubular valve body 3 rotatably supported inside the housing 1 via a drive shaft 2, and the valve body 3 is accommodated in the housing 1. It has an electric motor 4 that is rotationally driven, and a deceleration mechanism 5 that is housed in a housing 1 and that decelerates and transmits the rotation of the electric motor 4.

The housing 1 is formed in two portions in the axial direction, and is provided so as to close the first housing 11 accommodating the valve body 3 and the electric motor 4 and the opening on one end side of the first housing 11 for deceleration. It is composed of a second housing 12 for accommodating the mechanism 5. The first housing 11 and the second housing 12 are each molded by casting with an aluminum alloy material, and are fixed by a plurality of bolts 13.

In the present embodiment, the first housing 11 and the second housing 12 are exemplified by those manufactured of an aluminum alloy material, but in addition to this, synthetic resins having heat resistance and chemical resistance, for example, engineering plastics, are exemplified. It may be produced by a polyphenylene sulfide resin (PPS resin) which is a kind of the above.

The first housing 11 is attached in parallel to the hollow cylindrical valve body accommodating portion 111 accommodating the valve body 3 and the valve body accommodating portion 111, and is a hollow cylindrical motor accommodating the motor body 41 of the electric motor 4. It has an accommodating portion 112 and. Then, the first housing 11 is fixed to a cylinder block (not shown) via a flange portion 114 (described later) by a fixing means (for example, a plurality of bolts) (not shown).

One end side of the valve body accommodating portion 111 in the axial direction is closed by the end wall 113, and the other end side is formed with an opening. At the other end of the valve body accommodating portion 111 in the axial direction, a flange portion 114 for attaching the first housing 11 to a cylinder block (not shown) is provided so as to extend outward in the radial direction. Further, on the end wall 113 of the valve body accommodating portion 111, a covered cylindrical boss portion 115 is formed so as to project toward the second housing 12. A shaft through hole 116 through which the drive shaft 2 penetrates is formed through the end wall of the boss portion 115. Further, on the end wall 113 of the valve body accommodating portion 111, a pair of flat plate-shaped bearing portions 117, which support the support shafts 51 and 52 of the deceleration mechanism 5, which will be described later, at both end portions in the radial direction (longitudinal direction). 117 is formed upright. Bearing holes 117a and 117a that rotatably support the support shafts 51 and 52 are formed through the pair of bearing portions 117 and 117, respectively.

The second housing 12 is formed in a concave shape in a vertical cross section that straddles the valve body accommodating portion 111 and the motor accommodating portion 112 and opens the valve body accommodating portion 111 and the motor accommodating portion 112 so as to be coverable. Then, the deceleration mechanism accommodating portion 121 accommodating the deceleration mechanism 5 is formed by the concave internal space.

In the electric motor 4, the motor body 41 is housed in the motor accommodating portion 112 so that the output shaft 42 faces the second housing 12 side. Then, the electric motor 4 is provided at a plurality of open edges of the motor accommodating portion 112 via a flange portion 43 provided at the end portion of the motor main body 41 on the output shaft 42 side so as to extend radially outward. It is fixed by the bolt 44. The electric motor 4 is controlled by an in-vehicle electronic controller (not shown), and the valve body 3 is rotationally driven according to the operating state of the vehicle to appropriately distribute the cooling water to the radiator RD and the like (see FIG. 1). It will be realized.

The reduction gear mechanism 5 is a drive mechanism composed of two sets of staggered gears, a first gear G1 and a second gear G2. The first gear G1 is provided coaxially with the output shaft 42 of the electric motor 4, and is arranged so as to be orthogonal to the output shaft 42 of the electric motor 4 and the first screw gear WG1 that rotates integrally with the output shaft 42. It is composed of a first oblique gear HG1 that is rotationally supported by the first support shaft 51 and meshes with the first screw gear WG1. The second gear G2 is rotationally supported by the second support shaft 52 and is fixed to the drive shaft 2 and meshes with the second screw gear WG2 and the second screw gear WG2 that rotates integrally with the first oblique tooth gear HG1. It is composed of a second oblique gear HG2. Here, the first oblique gear HG1 and the second oblique gear HG2 are composite gear members in which cylindrical double gears HG1 and HG2 are arranged in series and integrally formed, and the composite gear member of the composite gear member. It is rotationally supported by a pair of bearing portions 117, 117 of the first housing 11 via the first and second support shafts 51, 52 inserted at both ends. From such a configuration, the rotational driving force output from the output shaft 42 of the electric motor 4 is decelerated in two stages via the first gear G1 and the second gear G2 and transmitted to the valve body 3.

FIG. 4 shows a cross-sectional view of the control valve CV cut along the line AA of FIG. In the description of this figure, the direction parallel to the rotation axis Z of the drive shaft 2 is the "axial direction", the direction orthogonal to the rotation axis Z of the drive shaft 2 is the "radial direction", and the circumference of the rotation axis Z of the drive shaft 2 The direction of is described as "circumferential direction". Further, the "axial direction" will be described with the upper side in FIG. 4 as the "one end side" and the lower side as the "other end side".

As shown in FIG. 4, the first housing 11 is formed with a bottomed cylindrical valve body accommodating portion 111 in which one end side in the axial direction is closed by the end wall 113 and the other end side is open to the outside. Further, in the boss portion 115 provided on the end wall 113 of the valve body accommodating portion 111, a shaft through hole 116 through which the drive shaft 2 penetrates communicates the valve body accommodating portion 111 and the deceleration mechanism accommodating portion 121 described later. As such, it is formed along the axial direction. Further, in the first housing 11, a bottomed cylindrical motor accommodating portion 112 accommodating the motor main body 41 of the electric motor 4 is directed toward one end side in the axial direction in a form adjacent to the valve body accommodating portion 111. An opening is formed (see FIG. 3).

Further, the first housing 11 has a fixing means (not shown) on the side portion of the cylinder head (not shown) via the flange portion 114 provided on the outer peripheral edge of the other end portion in the axial direction of the valve body accommodating portion 111. For example, it is fixed by a plurality of bolts (see FIG. 3). An introduction port E0 as a first communication port for introducing cooling water from the cylinder block side is formed on the inner peripheral side of the flange portion 114 so as to communicate with the inside of the cylinder block (not shown). That is, the introduction port E0 communicates with the opening on the other end side of the valve body accommodating portion 111, and the cooling water can be introduced into the valve body accommodating portion 111 through the introduction port E0.

Further, on the peripheral wall of the valve body accommodating portion 111, a plurality of through holes having a substantially circular cross section for communicating the outside and the valve body accommodating portion 111 are formed as the first to third discharge ports E1 to E3. Corresponding first to third pipes L1 to L3 are connected to each of these discharge ports E1 to E3 (hereinafter, refer to FIG. 2 for the second discharge port E2). The first discharge port E1 is connected to, for example, a heater HT via the first pipe L1. The second discharge port E2 is connected to, for example, the oil cooler OC via the second pipe L2. The third discharge port E3 is connected to, for example, the radiator RD via the third pipe L3. The first to third outlets E1 to E3 correspond to the second communication port according to the present invention.

Here, the first to third outlets E1 to E3 have different axial positions on the peripheral wall of the first housing 11, and each has a different circumferential position on the peripheral wall of the first housing 11, specifically. Are arranged at positions that are out of phase by about 90 ° (see FIG. 3).

Further, on the inner peripheral side of the first to third discharge ports E1 to E3, a sealing means for airtightly sealing between the respective discharge ports E1 to E3 and the valve body 3 is provided. This sealing means is a first metal first to urge the first to third sealing members S1 to S3 made of a synthetic resin material and the first to third sealing members S1 to S3 toward the valve body 3. It is composed of the third coil springs SP1 to SP3. Further, on the outer peripheral side of the first to third seal members S1 to S3, first to third seal rings SR1 to SR3 that can be slidably contacted with the first to third discharge ports E1 to E3 are attached.

The first to third seal members S1 to S3 are formed of a predetermined fluororesin (PTFE (polytetrafluoroethylene) in this embodiment) and are housed on the inner peripheral side of the first to third discharge ports E1 to E3. Therefore, they are provided so as to be able to move forward and backward toward the valve body 3 side. The first to third coil springs SP1 to SP3 are arranged between the first to third seal members S1 to S3 and the first to third pipes L1 to L3 with a predetermined set load, and the seal members S1 to S3, respectively. Is an urging member that urges the valve body 3 side.

The drive shaft 2 has a rod shape having a constant outer diameter, is arranged so as to pass through the shaft through hole 116 and straddle the valve body accommodating portion 111 and the deceleration mechanism accommodating portion 121, and is accommodated and held on the inner peripheral side of the boss portion 115. It is rotatably supported by the bearing B1. Further, the space between the drive shaft 2 and the shaft through hole 116 is airtightly sealed by the annular seal member 20. That is, the seal member 20 prevents the cooling water from flowing out to the second housing 12 side in the valve body accommodating portion 111 through the shaft through hole 116.

The valve body 3 is formed of a predetermined hard resin material, has a bottomed cylindrical shape having a constant outer diameter, and has an introduction portion M0 (corresponding to the first opening according to the present invention) which is an opening on the other end side. Is provided so as to face the introduction port E0 side, so that the cooling water is guided to the internal passage 118 formed on the inner peripheral side. Then, one end of the valve body 3 in the axial direction is press-fitted and fixed to the drive shaft 2 via a metal insert member 30 embedded in the inner peripheral side of the one end, while being fixed to the introduction port E0 side. The other end facing the surface is rotatably supported by a bearing B2 held on the inner peripheral side of the introduction port E0.

Further, on the peripheral wall of the valve body 3, a first position capable of communicating with the first to third discharge ports E1 to E3 at axial positions corresponding to the first to third discharge ports E1 to E3 of the first housing 11. The third openings M1 to M3 are formed through the third openings M1 to M3, respectively, along the radial direction. In the present embodiment, the third opening M3 of the first to third openings M1 to M3 corresponds to the second opening according to the present invention.

In the control valve CV configured as described above, the valve body 3 is controlled at a circumferential position where at least a part of the first opening M1 and the first discharge port E1 overlap, so that the cooling water is supplied to the first pipe L1. To distribute. Similarly, the control valve CV distributes the cooling water to the second pipe L2 by controlling the valve body 3 at a circumferential position where at least a part of the second opening M2 and the second discharge port E2 overlap. The cooling water is distributed to the third pipe L3 by controlling the valve body 3 at a position in the circumferential direction where at least a part of the opening M3 and the third discharge port E3 overlap. Further, when the cooling water is distributed, the degree of overlap (overlapping area) between the first to third openings M1 to M3 and the first to third outlets E1 to E3 changes, so that the cooling water at the time of distribution is changed. The flow rate changes.

[First Embodiment]
Hereinafter, the first embodiment of the control valve and the manufacturing method thereof according to the present invention will be shown with reference to FIGS. 5 to 10.

FIG. 5 shows a cross-sectional view of the control valve CV cut along the line BB of FIG. 6A and 6B are views showing the valve body 3 as a single unit, where FIG. 6A is a perspective view seen from the introduction port E0 side, and FIG. 6B is taken along the line CC of FIG. 6A. The cut sectional view, (c) shows the sectional view cut along the DD line of the figure (b). In the description of each figure, the direction parallel to the rotation axis Z of the valve body 3 is the "axial direction", the direction orthogonal to the rotation axis Z of the valve body 3 is the "radial direction", and the circumference of the rotation axis Z of the valve body 3 The direction of is described as "circumferential direction".

As shown in FIGS. 5 and 6, the valve body 3 is formed in a bottomed cylindrical shape in which one end side in the axial direction is closed by the end wall 31 and the other end side is opened by the introduction port E0. A recess 311 for receiving the boss portion 115 of the first housing 11 is formed in the central portion of the end wall 31, and an insert member 30 is embedded in the bottom of the recess 311. Further, on the outer peripheral side of the recess 311, a part of the circumferential region of the end wall 31, specifically, a region of about half a circumference is gradually recessed toward the introduction portion M0 side toward the inside in the radial direction. An inclined recess 312 is formed so as to be inclined in a shape.

Further, the peripheral wall 32 of the valve body 3 is formed so that the outer diameter is constant, while the inner diameter is formed so as to gradually expand from the end wall 31 side toward the introduction portion M0 side. That is, on the inner peripheral surface of the peripheral wall 32 of the valve body 3, a tapered surface 321 that functions as a so-called punching taper when the second molding die D2 of the valve body molding die DX, which will be described later, is detached is formed. The tapered surface 321 ensures smooth desorption of the second molding die D2, which will be described later, when the valve body 3 is molded.

Further, on the peripheral wall 32 of the valve body 3, the first to third openings M1 for distributing the cooling water are provided at predetermined positions in the circumferential direction corresponding to the first to third discharge ports E1 to E3 of the first housing 11. ~ M3 is formed through. The first to third openings M1 to M3 are arranged at different positions in the axial direction, and overlap with the first to third outlets E1 to E3 in a predetermined phase, and the overlapped first to third outlets E1. Cooling water is supplied to a predetermined auxiliary machine (heater HT, oil cooler OC, radiator RD, etc. in FIG. 1) via E3.

Further, the third opening M3 is formed so as to penetrate diagonally with respect to the peripheral wall of the valve body 3 so that both ends in the circumferential direction are inclined with respect to the radial direction. As a result, at the first end portion P1 in the circumferential direction of the third opening M3, a first inclined surface M31 is formed which is inclined in a direction in which the inner diameter R3 expands from the outer peripheral side to the inner peripheral side of the valve body 3. At the same time, a first parallel inclined surface M33 parallel to the first inclined surface M31 is formed on the second end portion P2.

Further, on the inner peripheral surface of the valve body 3, a first groove portion 33 having a V-shaped cross section when the inner peripheral surface is viewed along the axial direction from the introduction portion M0 side is straight along the axial direction. It is formed in a shape. The first groove 33 is provided at a predetermined circumferential position through the second end P2 of the third opening M3. Specifically, the first groove portion 33 is formed so that one of the pair of slopes 331 and 332, the slope 331, overlaps with the second end portion P2 of the third opening M3.

In this way, the inner peripheral surface of the valve body 3 is cut out by the first groove portion 33, so that the opening edge inside the second end portion P2 of the third opening portion M3 is inside from the outer peripheral side of the valve body 3. A second inclined surface M32 is formed, which is inclined in a direction in which the inner diameter R3 expands toward the circumferential side. The inclination angle θ2 of the second inclined surface M32 is larger than the inclination angle θ1 of the first inclined surface M31. Here, the inclination angles θ1 and θ2 correspond to the inferior angles formed between the imaginary line X3 along the inner peripheral surface of the third seal member S3 in FIG. 6 (c), respectively.

As described above, in FIGS. 5 and 6, only the third opening M3 has been described as an example, but the first and second openings M1 and M2 can also be formed in the same manner as the third opening M3. Needless to say, the effects of the present invention, which will be described later, can be achieved.

7 to 10 are views showing the manufacturing process of the valve body 3. 7A and 7B show a vertical cross-sectional view showing the mold closing process, and FIG. 7B shows a cross-sectional view cut along the line EE of the same figure (a). Further, FIG. 8 shows a vertical cross-sectional view showing the resin filling process in FIG. 8A, and a cross-sectional view cut along the line FF in FIG. 8A. Further, FIG. 9 shows a vertical cross-sectional view showing the first inclined surface forming step, and FIG. 9B shows a cross-sectional view cut along the GG line of the same figure (a). Further, FIG. 10 shows a vertical cross-sectional view showing the second inclined surface forming step, and FIG. 10B shows a cross-sectional view cut along the line HH of the same figure (a). In the description of each figure, the direction parallel to the rotation axis Z of the valve body 3 is the "axial direction", the direction orthogonal to the rotation axis Z of the valve body 3 is the "radial direction", and the circumference of the rotation axis Z of the valve body 3 The direction of is described as "circumferential direction". Further, in the following description based on FIGS. 7 to 10, only the third opening M3 among the first to third openings M3 will be described for convenience, but the other openings, the first and second openings, will be described. Naturally, M1 and M2 are also formed in the same manner as the third opening M3.

First, before explaining the manufacturing process of the valve body 3, the valve body forming mold DX used for forming the valve body 3 will be described. This valve body forming die DX is a divided die divided into three, and is composed of a first forming die D1, a second forming die D2, and a third forming die D3. Then, the cavity C is formed by the space formed between the first molding die D1 and the second molding die D2, and the resin material RS is filled in the cavity C to form the valve body 3. ..

The first molding die D1 has a substantially bottomed cylindrical shape, one end side in the axial direction is opened by the opening D11, and the other end side is closed by the end wall D12 to form the outer shape of the valve body 3. A gate D13 for filling the resin material RS in the cavity C is formed through the end wall D12 of the first molding die D1. Further, in the peripheral wall D14 of the first molding die D1, a substantially circular mold insertion hole D15 into which the third molding die D3 is inserted is formed obliquely through the peripheral wall D14.

The second molding die D2 has a substantially columnar shape, is arranged inside the first molding die D1, and is used for forming the inner shape of the valve body 3. In the second molding die D2, a stepped diameter-expanded portion D21 for closing the mold is formed on the outer peripheral side of one end (outer end) in the axial direction by engaging with the opening D11 of the first molding die D1. Has been done. Further, at the central position of the other end portion (inner end portion) in the axial direction of the second molding die D2, a columnar insert holding portion D22 used for holding the insert member 30 is formed so as to project along the axial direction. There is. Further, on the peripheral wall of the second molding die D2, a ridge D23 overlapping the hole edge of the die insertion hole D15 of the first molding die D1 is formed along the axial direction.

The third molding die D3 has a substantially columnar shape whose outer peripheral side is formed in a tapered shape, and is inserted and arranged in the mold insertion hole D15 of the first molding die D1. That is, the third molding die D3 is inserted and arranged so as to cross the cavity C from the outer peripheral side, thereby forming the third opening M3 with the molding of the valve body 3. By inserting the third molding die D3 diagonally in this way, the first inclined surface M31 and the first parallel inclined surface M33 of the third opening M3 of the valve body 3 can be formed.

Hereinafter, the manufacturing process of the valve body 3 will be described. In manufacturing the valve body 3, first, as shown in FIG. 7, the insert member 30 is fixed to the insert holding portion D22 of the second molding die D2, and then the second molding die from the other end side of the second molding die D2. The first molding die D1 is placed so as to cover D2. After that, the third mold D3 is inserted and arranged in the mold insertion hole D15 of the first mold D1 until the tip D31 abuts on the second mold D2, and the mold is closed (mold closing step). After closing the mold, as shown in FIG. 8, the cavity C is filled with the resin material RS via the gate D13 of the first molding mold D1 (resin filling step). After filling the resin material RS, as shown in FIG. 9, the third molding die D3 is detached to form the third opening M3 of the valve body 3, and the third molding die D3 is detached. Along with this, a first inclined surface M31 and a first parallel inclined surface M33 are formed in the third opening M3 (first inclined surface forming step). After the third mold D3 is detached, as shown in FIG. 10, the first and second molds D1 and D2 are detached and the valve body 3 is taken out. At this time, by detaching the second molding die D2, the introduction portion M0 of the valve body 3 is formed, and at the same time, the ridge D23 is detached with the detachment of the second molding die D2. A second inclined surface M32 is formed at the opening edge of the second end P2 of the opening M3 (second inclined surface forming step). With the above, the production of the valve body 3 is completed.

(Action and effect of this embodiment)
According to the conventional control valve, due to the die-cutting when forming the opening of the valve body, the inner peripheral surface of at least one end side in the circumferential direction of the opening is from the outer peripheral side to the inner peripheral side. The inner diameter of the opening is narrowed (corresponding to the first parallel inclined surface M33 in the present embodiment). As a result, an edge protruding inward is formed on the inner peripheral side edge of the opening on one end side in the circumferential direction, and this edge causes a pressure loss when the cooling water flows out from the opening. There was a problem that it would end up.

On the other hand, the control valve CV according to the present embodiment can solve the problem of the conventional control valve by achieving the following effects.

That is, the control valve CV opens to the valve body accommodating portion 111, the introduction port E0 corresponding to the first communication port that opens to the valve body accommodating portion 111 to introduce the fluid, and the valve body accommodating portion 111 to provide the fluid. A cylindrical valve body rotatably housed in a valve body accommodating portion 111 and a housing 1 having a third discharge port E3 corresponding to a second communication port used for discharging the above, and can communicate with the introduction port E0. A valve having an introduction portion M0 corresponding to the first opening and a third opening M3 corresponding to the second opening which is formed through the peripheral wall and overlaps with the third discharge port E3 according to the rotation position. A first inclined surface M31 provided on the inner peripheral surface of the body and the third opening M3 and inclined in a direction in which the inner diameter R3 expands from the outer peripheral side to the inner peripheral side of the valve body 3, and the inner surface of the valve body 3. The first groove 33 formed on the peripheral surface along the direction of the rotation axis Z of the valve body 3 and the third opening M3 on the opposite side of the rotation axis Z from the first inclined surface M31. It is provided with a second inclined surface M32 formed by one groove 33 and inclined in a direction in which the inner diameter R3 expands from the outer peripheral side to the inner peripheral side of the valve body 3.

As described above, in the control valve CV according to the present embodiment, the inner peripheral surface of the first end portion P1 which is the end portion on the one end side in the circumferential direction of the third opening portion M3 is valved by the first inclined surface M31. The inner diameter R3 is inclined in the direction of expansion from the outer peripheral side to the inner peripheral side of the body 3. On the other hand, on the inner peripheral surface of the second end portion P2, which is the end portion on the other end side in the circumferential direction of the third opening portion M3, the second inclined surface M32 is formed by the first groove portion 33, and the first inclined surface M31 Similarly, the inner diameter R3 is inclined in the direction of expanding from the outer peripheral side to the inner peripheral side of the valve body 3. In other words, in the third opening M3 of the control valve CV according to the present embodiment, both ends in the circumferential direction (first and second ends P1, P2) are provided by the first and second inclined surfaces M31 and M32. The formation of corners (edges) at the inner opening edge of the is suppressed.

With such a configuration, when the cooling water guided from the introduction portion M0 side flows out through the third opening M3, the flow of the cooling water can be made smoother, and the third opening M3 can be made smoother. It is possible to suppress the pressure loss of the cooling water in. As a result, the power consumption of the electric motor 4 can be reduced, and by extension, the fuel efficiency of the engine EG equipped with the control valve CV can be improved.

In particular, the third opening M3 gradually communicates with the third discharge port E3 from the circumferential end (first end P1 or second end P2) as the valve body 3 rotates. Based on this communication mode, the pressure loss can be effectively reduced by providing the first and second inclined surfaces M31 and M32 at the circumferential end of the third opening M3.

Further, the method of manufacturing the control valve CV is as follows: the introduction portion M0 corresponding to the first opening communicating with the introduction port E0 corresponding to the first communication port of the housing 1, and the housing 1 formed through the peripheral wall and formed according to the rotation position. It has a third opening M3 corresponding to a second opening whose overlapping state changes with a third discharge port E3 corresponding to the second communication port of the above, and one end of the third opening M3 in the direction of rotation. The (first end portion P1) is provided with a first inclined surface M31 that inclines in a direction in which the inner diameter R3 expands toward the inner peripheral side, and the first inclined surface M31 in the rotation direction of the third opening M3. A control valve CV having a tubular valve body 3 provided with a second inclined surface M32 provided on the opposite side (second end P2) and inclined in a direction in which the inner diameter R3 expands toward the inner peripheral side. In the manufacturing method, the first molding die D1 in which the die insertion hole D15 that diagonally penetrates the peripheral wall is formed, and the direction of the rotation axis Z of the valve body 3 on the outer peripheral portion are arranged inside the first molding die D1. A second molding die D2 having a ridge D23 overlapping the hole edge of the die insertion hole D15, and a first molding die D1 and a second molding die inserted into the mold insertion hole D15 from the outer peripheral side of the first molding die D1. After the resin filling step of filling the cavity C of the valve body molding die DX composed of the third molding die D3 penetrating the cavity C formed between D2 with the resin, and the resin filling step, the third molding A first inclined surface forming step of forming a third opening M3 by detaching the mold D3 and forming a first inclined surface M31 in the third opening M3 with the detachment of the third molding die D3. After the first inclined surface forming step, the introduction portion M0 is formed by detaching the second molding die D2, and the ridge D23 is detached as the second forming die D2 is detached to form the third. It is desirable to have a second inclined surface forming step of forming the second inclined surface M32 in the opening M3.

In this way, by providing the ridge D23 on the outer peripheral portion of the second molding die D2, the first groove portion 33 is easily formed, and the second end portion P2 of the third opening M3 also faces the inner peripheral side. A second inclined surface M32 is formed so as to be inclined in the direction in which the inner diameter R3 is expanded. In other words, the second end P2 of the third opening M3 is only a relatively small change in which the ridge D23 is added to the outer peripheral portion of the second molding mold D2 of the valve body molding mold DX that has been used conventionally. The second inclined surface M32 can be formed on the surface.

Further, in the present embodiment, the first groove portion 33 is formed in a V shape when viewed from the direction of the rotation axis Z of the valve body 3.

With such a configuration, it is possible to suppress the generation of vortices on the second inclined surface M32, as compared with the case where the first groove portion 33 is formed in a U-shaped cross section, for example. In other words, when the first groove portion 33 is formed so as to have a U-shaped cross section, the second inclined surface M32 is formed in a concave rounded shape, and as a result, the cooling is performed by the concave rounded second inclined surface M32. There is a risk that vortices will occur in the flow of water. That is, the pressure loss may not be sufficiently reduced by the second inclined surface M32.

[Second Embodiment]
11 and 12 show a second embodiment of the control valve and the manufacturing method thereof according to the present invention, and in the valve body 3 according to the first embodiment, the first opening M1 is also the third inclined surface M12. And the fourth inclined surface M11 is formed. Since the basic configuration other than the changes is the same as that of the first embodiment, the same configurations as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

11A and 11B are views showing the valve body 3A according to the present embodiment, in which FIG. 11A is a perspective view of the valve body 3A, and FIG. 11B is cut along the line II of FIG. A cross-sectional view is shown. 12 is a cross-sectional view of the valve body 3A shown in FIG. 11, FIG. 12A is a cross-sectional view taken along the line JJ of FIG. 11B, and FIG. 11B is FIG. 11 (b). The cross-sectional view cut along the KK line of b) is shown. In the description of each figure, the direction parallel to the rotation axis Z of the valve body 3A is the "axial direction", the direction orthogonal to the rotation axis Z of the valve body 3A is the "radial direction", and the circumference of the rotation axis Z of the valve body 3A. The direction of is described as "circumferential direction".

In the present embodiment, as shown in FIGS. 11 and 12, the first opening M1 provided at a position different from the third opening M3 in the axial direction of the valve body 3A (corresponding to the third opening according to the present invention). Is also formed almost circularly. Further, the first opening M1 is also formed diagonally through the peripheral wall 32 of the valve body 3A so that both ends in the circumferential direction are inclined in the radial direction, similarly to the third opening M3. ing. As a result, a fourth inclined surface M11 is formed on the first end portion P1 in the circumferential direction of the first opening M1 so that the inner diameter R1 is inclined in the direction of expanding from the outer peripheral side to the inner peripheral side of the valve body 3. At the same time, a fourth parallel inclined surface M23 parallel to the fourth inclined surface M11 is formed on the second end portion P2.

Further, in the present embodiment, the first groove portion 33 is provided so as to pass through the second end portion P2 of the third opening portion M3 and the second end portion P2 of the first opening portion M1. Specifically, the first groove 33 is formed so that one of the pair of slopes 331 and 332 overlaps the second end P2 of the third opening M3, and the other slope 332 is formed. It is formed so as to overlap the second end portion P2 of the first opening portion M1. As a result, a third inclined surface M12 that inclines in the direction in which the inner diameter R1 expands from the outer peripheral side to the inner peripheral side of the valve body 3A is formed on the inner opening edge of the second end portion P2 of the first opening M1. Has been done. The inclination angle θ3 of the third inclined surface M12 is larger than the inclination angle θ4 of the fourth inclined surface M11. Here, the inclination angles θ3 and θ4 correspond to the inferior angles formed between the imaginary line X1 along the inner peripheral surface of the first seal member S1 in FIG. 12B, respectively.

As described above, in the control valve CV according to the present embodiment, the housing 1 further has a first discharge port E1 corresponding to a third communication port which is opened to the valve body accommodating portion 111 and is used for discharging the fluid. The valve body 3A further has a first opening M1 corresponding to a third opening that is formed through the peripheral wall and overlaps with the first discharge port E1 according to the rotation position of the valve body 3A. The portion M1 has a third inclined surface M12 formed by the first groove portion 33 and inclined in a direction in which the inner diameter R1 expands from the outer peripheral side to the inner peripheral side of the valve body 3A.

That is, in the present embodiment, the first groove portion 33 is provided so as to straddle the second end portion P2 of the third opening portion M3 and the second end portion P2 of the first opening portion M1. As a result, a third inclined surface M12 that inclines in the direction in which the inner diameter R1 expands from the outer peripheral side to the inner peripheral side of the valve body 3A also on the inner opening edge of the second end portion P2 of the first opening M1. It is formed. As described above, in providing the third inclined surface M12 also for the first opening M1, the specifications of the second molding die D2 are changed by sharing the first groove 33 in the second and third openings M2 and M3. Can be minimized, and the efficiency of manufacturing the valve body 3A can be improved.

Further, in the present embodiment, the first opening M1 is provided at a position different from that of the third opening M3 in the direction of the rotation axis Z of the valve body 3A.

By arranging the second and third openings M2 and M3 at different axial positions in this way, it is possible to realize a plurality of distribution patterns of cooling water by the valve body 3A in the control valve CV.

Further, in the present embodiment, the first opening M1 is provided on the opposite side of the rotation axis Z in the circumferential direction with respect to the third inclined surface M12, and the inner diameter is from the outer peripheral side to the inner peripheral side of the valve body 3A. It has a fourth inclined surface M11 that is inclined in a direction in which R1 expands.

In this way, the first end portion P1 of the first opening M1 is also provided with the fourth inclined surface M11 that inclines in the direction in which the inner diameter R1 expands from the outer peripheral side to the inner peripheral side of the valve body 3A. The generation of pressure loss is also suppressed at the first end P1 of the first opening M1 and is provided for further smoothing the flow of cooling water at the first opening M1.

[Third Embodiment]
FIG. 13 shows a third embodiment of the control valve and the manufacturing method thereof according to the present invention, and the second groove portion 34 is added to the valve body 3 according to the first embodiment. Since the basic configuration other than the changes is the same as that of the first embodiment, the same configurations as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

13A and 13B are views showing the valve body 3B according to the present embodiment, where FIG. 13A is a perspective view of the valve body 3B and FIG. 13B is cut along the line LL of FIG. 13A. The cross-sectional view, (c) shows the cross-sectional view cut along the MM line of the figure (b). In the description of this figure, the direction parallel to the rotation axis Z of the valve body 3B is the "axial direction", the direction orthogonal to the rotation axis Z of the valve body 3B is the "radial direction", and the circumference of the rotation axis Z of the valve body 3B. The direction of is described as "circumferential direction".

In the present embodiment, as shown in FIG. 13 (c), the third opening M3 is formed perpendicular to the peripheral wall of the valve body 3B. As a result, the inner peripheral surface of the third opening M3 is an inclined surface such that the inner diameter R3 gradually decreases from the outer peripheral side to the inner peripheral side of the valve body 3B, and the third molding die D3 (FIG. An inclined surface M30 forming a punching taper for desorption of (see 9) is formed.

Further, in the present embodiment, on the inner peripheral surface of the valve body 3B, the inner peripheral surface of the valve body 3B is axially opposite to the circumferential direction of the first groove portion 33 with the third opening M3 sandwiched from the introduction portion M0 side. The second groove portion 34, which has a V-shaped cross section when viewed along the same direction as the first groove portion 33, is formed linearly along the axial direction. The second groove portion 34 is provided at a predetermined circumferential position through the first end portion P1 of the third opening portion M3. Specifically, the second groove portion 34 is formed so that one of the pair of slopes 341 and 342, the slope 341, overlaps with the first end portion P1 of the third opening M3. That is, by cutting out the inner peripheral surface of the valve body 3B by the second groove portion 34, the inner peripheral surface of the valve body 3B is cut out from the outer peripheral side to the inner peripheral side of the valve body 3B at the inner opening edge of the first end portion P1 of the third opening portion M3. A first inclined surface M31 is formed which is inclined in a direction in which the inner diameter R3 is expanded toward the inside. In other words, in this embodiment, the first inclined surface M31 is formed by the second groove portion 34.

As described above, in the control valve CV according to the present embodiment, the first inclined surface M31 is formed on the inner peripheral surface of the valve body 3B by the second groove portion 34 formed along the direction of the rotation axis Z of the valve body 3B. It is formed.

As described above, in the present embodiment, the first inclined surface M31 is formed by the second groove portion 34 not only in the second end portion P2 in the circumferential direction of the third opening portion M3 but also in the first end portion P1. .. As a result, regardless of the direction (pulling direction) in which the third molding die D3 is detached during the manufacture of the valve body 3B, the first and second inclinations are made to the inner opening edges of both ends in the circumferential direction of the third opening M3. The surfaces M31 and M32 can be formed.

The control valve CV according to the present invention is not limited to the configuration of the above embodiment, and can be freely changed according to the specifications of the internal combustion engine (engine) to be applied as long as it can exert the action and effect of the present invention. It is possible.

In particular, in the above embodiment, as an example of the application of the control valve CV, the application of the cooling water to the circulation system is exemplified, but the control valve CV is applied not only to the cooling water but also to various fluids such as lubricating oil. It goes without saying that it is applicable.

Further, in the above embodiment, the embodiment in which the valve body is provided with three openings consisting of the first to third openings M1 to M3 is exemplified, but at least one opening is provided on the peripheral wall of the valve body. However, it is not limited to the first to third openings M1 to M3.

As the control valve based on the embodiment described above, for example, the one described below can be considered.

That is, in one embodiment of the control valve, the valve body accommodating portion, the first communication port opened in the valve body accommodating portion to be used for introducing the fluid, and the valve body accommodating portion are opened to provide the fluid. A housing having a second communication port for discharging, a tubular valve body rotatably housed in the valve body accommodating portion, a first opening that can communicate with the first communication port, and a peripheral wall. A valve body having a second opening that is formed through the hole and changes in a state of overlapping with the second communication port according to the rotation position, and an outer peripheral side of the valve body provided on the inner peripheral surface of the second opening. A first inclined surface that inclines in a direction in which the inner diameter expands toward the inner peripheral side, a first groove portion formed on the inner peripheral surface of the valve body along the direction of the rotation axis of the valve body, and the first groove portion. Of the two openings, the first groove is formed on the side opposite to the first inclined surface in the circumferential direction of the rotation axis, and the inner diameter increases from the outer peripheral side to the inner peripheral side of the valve body. It has a second inclined surface that is inclined.

In a preferred embodiment of the control valve, the first inclined surface is formed by a second groove portion formed on the inner peripheral surface of the valve body along the direction of the rotation axis of the valve body. Control valve.

In another preferred embodiment, in any of the aspects of the control valve, the housing further comprises a third communication port that opens into the valve body accommodating portion to allow fluid to be discharged, the valve body being on the peripheral wall. It further has a third opening that is formed through and overlaps with the third communication port according to the rotation position of the valve body, and the third opening is formed by the first groove and the valve. It has a third inclined surface that inclines in a direction in which the inner diameter expands from the outer peripheral side to the inner peripheral side of the body.

In yet another preferred embodiment, in any of the aspects of the control valve, the third opening is provided at a position different from the second opening in the direction of the rotation axis of the valve body.

In yet another preferred embodiment, in any of the aspects of the control valve, the third opening is provided on the opposite side of the rotation axis in the circumferential direction with respect to the third inclined surface, and the valve body. It has a fourth inclined surface that inclines in a direction in which the inner diameter expands from the outer peripheral side to the inner peripheral side.

In yet another preferred embodiment, in any one of the control valve embodiments, the first groove is formed in a V shape when viewed from the direction of the rotation axis of the valve body.

Further, as a method for manufacturing a control valve based on the above-described embodiment, for example, the method described below can be considered.

That is, in one aspect of the method for manufacturing the control valve, the first opening that communicates with the first communication port of the housing and the second communication port of the housing that is formed through the peripheral wall and overlaps with the second communication port of the housing according to the rotation position. It has a second opening whose state changes, and one end of the second opening in the direction of rotation is provided with a first inclined surface that inclines in a direction in which the inner diameter increases toward the inner peripheral side. , A tubular shape having a second inclined surface provided on the opposite side of the first inclined surface in the direction of rotation of the second opening and inclined in a direction in which the inner diameter increases toward the inner peripheral side. A method for manufacturing a control valve including a valve body, in which a first molding die having a mold insertion hole diagonally penetrating the peripheral wall and a first molding die arranged inside the first molding die, and the valve body having the valve body on the outer peripheral portion thereof. A second molding die having a ridge overlapping the hole edge of the mold insertion hole along the direction of the rotation axis, and the first molding die and the first molding die inserted into the mold insertion hole from the outer peripheral side of the first molding die. After the resin filling step of filling the cavity of the valve body molding die composed of the third molding die penetrating the cavity formed between the two molding dies and the resin filling step, the third molding The first inclined surface forming step of forming the second opening by removing the mold and forming the first inclined surface in the second opening with the removal of the third molding mold, and the above. After the first inclined surface forming step, the first opening is formed by detaching the second molding die, and the ridges are detached with the detachment of the second forming die. It has a second inclined surface forming step of forming the second inclined surface in a second opening.

CV ... control valve, 1 ... housing, 111 ... valve body accommodating part, E0 ... introduction port (first communication port), E2 ... second discharge port (third communication port), E3 ... third discharge port (second communication port) Mouth), 3 ... valve body, M0 ... introduction part (first opening), M1 ... first opening (third opening), M3 ... third opening (second opening), M31 ... first inclination Surface, M32 ... 2nd inclined surface, M11 ... 4th inclined surface, M12 ... 3rd inclined surface, 33 ... 1st groove portion, 34 ... 2nd groove portion,

Claims (7)

A housing having a valve body accommodating portion, a first communication port that opens into the valve body accommodating portion to allow fluid to be introduced, and a second communication port that opens to the valve body accommodating portion to allow fluid to be discharged.
A tubular valve body rotatably housed in the valve body accommodating portion, the first opening that can communicate with the first communication port, and the second communication that is formed through the peripheral wall and is formed according to the rotation position. A valve body having a second opening whose state of overlap with the mouth changes, and
A first inclined surface provided on the inner peripheral surface of the second opening and inclined in a direction in which the inner diameter increases from the outer peripheral side to the inner peripheral side of the valve body.
A first groove formed on the inner peripheral surface of the valve body along the direction of the rotation axis of the valve body, and
Of the second opening, the first groove is formed on the side opposite to the first inclined surface in the circumferential direction of the rotation axis, and the inner diameter expands from the outer peripheral side to the inner peripheral side of the valve body. The second inclined surface that inclines in the direction,
A control valve characterized by being equipped with. In the control valve according to claim 1,
The control valve is characterized in that the first inclined surface is formed by a second groove portion formed on the inner peripheral surface of the valve body along the direction of the rotation axis of the valve body. In the control valve according to claim 1,
The housing further has a third communication port that opens into the valve body accommodating portion to allow fluid to be discharged.
The valve body further has a third opening which is formed through the peripheral wall and whose state of overlapping with the third communication port changes according to the rotation position of the valve body.
The third opening is a control valve formed by the first groove and has a third inclined surface that is inclined in a direction in which the inner diameter increases from the outer peripheral side to the inner peripheral side of the valve body. .. In the control valve according to claim 3,
The control valve is characterized in that the third opening is provided at a position different from that of the second opening in the direction of the rotation axis of the valve body. In the control valve according to claim 3,
The third opening is provided on the side opposite to the third inclined surface in the circumferential direction of the rotation axis, and is inclined in a direction in which the inner diameter increases from the outer peripheral side to the inner peripheral side of the valve body. A control valve characterized by having a fourth inclined surface. In the control valve according to claim 1,
The first groove portion is a control valve characterized in that it is formed in a V shape when viewed from the direction of the rotation axis of the valve body. It has a first opening that communicates with the first communication port of the housing, and a second opening that is formed through the peripheral wall and overlaps with the second communication port of the housing according to the rotation position. A first inclined surface that inclines in a direction in which the inner diameter increases toward the inner peripheral side is provided at one end of the opening in the direction of rotation, and the first of the second openings in the direction of rotation. A method for manufacturing a control valve having a tubular valve body provided on the opposite side of the inclined surface and provided with a second inclined surface which is provided on the opposite side and is inclined in a direction in which the inner diameter increases toward the inner peripheral side.
A first molding mold having a mold insertion hole that diagonally penetrates the peripheral wall, and a hole of the mold insertion hole that is arranged inside the first molding mold and is located on the outer peripheral portion along the direction of the rotation axis of the valve body. It penetrates a second molding die having a ridge overlapping with an edge and a cavity inserted into the mold insertion hole from the outer peripheral side of the first molding die and formed between the first molding die and the second molding die. A resin filling step of filling the cavity of the valve body molding die composed of the third molding die with resin, and
After the resin filling step, the second opening is formed by removing the third molding die, and the first inclined surface is formed in the second opening with the removal of the third molding die. The first inclined surface forming step to be formed and
After the first inclined surface forming step, the first opening is formed by detaching the second molding die, and the ridges are detached with the detachment of the second molding die. A second inclined surface forming step of forming the second inclined surface in the second opening, and
A method for manufacturing a control valve, which comprises.

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