JPH0542868U - Bimetal oil switching valve - Google Patents

Abstract

(57) [Summary] [Purpose] The oil flow path can be opened and closed with a small temperature difference,
Responsiveness is good, accuracy of operating temperature can be improved and cost can be reduced. It is also an object of the present invention to be compact even if it has a fail-safe mechanism and to be able to simplify the circuit even if it has a relief function. [Structure] A valve body 12 is provided on a bimetal 11 that operates by a temperature change, and the valve body 12 and the bimetal 11 are attached to a guide body 13 in which flow path openings 16 and 17 are formed to form a valve main body 2. In the bimetal type oil switching valve A which moves the valve body 12 by operating the bimetal 11 to open and close the flow passage openings 16 and 17, while shortening the flow passage openings 16 and 17 in the moving direction of the valve body 12, It is characterized in that it is formed to be long in the direction orthogonal to the moving direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bimetal oil switching valve that uses a bimetal that operates according to temperature changes.

[0002]

[Prior Art]

 Conventionally, engine oil or an oil switching valve for a mission has a built-in thermal expansion body such as wax that expands and contracts due to a temperature change, and a thermostat that operates an operating part by a volume change of the thermal expansion body, or Although the valve element is moved using a thermoelement, etc., recently, due to the compactness and cost reduction of the valve, there is one that uses a bimetal instead of the thermal expansion element and the operating part. This bimetal has a plate shape. There are also spiral shapes.

For example, a bimetal type oil switching valve using a spiral bimetal is such that an elongated bimetal is formed in a spiral shape from the center so that the coefficients of thermal expansion differ in the inward and outward directions, and the center end of the bimetal is formed on a shaft. It consists of a guide body that is fixed and has a valve body at the other end, and a flow path opening that is opened and closed by the valve body, and a casing that houses them.The other end of the bimetal rotates when the oil temperature changes. As a result, the valve element moves to open and close the flow path opening.

[0004]

[Problems to be solved by the device]

 However, the conventional techniques have the following problems. In order to obtain an output (= load) that does not lose the oil pressure, the displacement of the bimetal is small, but the oil passage diameter is generally large, and the displacement of the bimetal opens and closes the oil passage. Then, many temperature differences are required before switching the flow path. For this reason, the responsiveness is poor, and it is difficult to perform fine control.

In addition, it is difficult to reduce the error of the bimetal in terms of cost and productivity in molding, and when the valve body is attached to the other end of the bimetal and the center end thereof is fixed to the case or the like, It is difficult to improve the accuracy of operating temperature and reduce the amount of leak because the bimetal is inserted into the fixed shaft or it is attached by spot welding.

When assembling the valve body including the guide body having the bimetal and the valve body mounted in the oil flow path or the circuit, a dedicated casing for determining the directionality of the pipe is prepared, and the casing is prepared. The fixing method such as bolting is used. Therefore, the assembling of the valve body required additional man-hours for marking to determine the directionality, increase of parts such as bolts, and preparation of a dedicated casing, which inevitably resulted in an increase in cost. In addition, problems such as incorrect assembly occur.

Further, each part is required to be fail-safe, and when the temperature of the oil rises excessively, a means for stopping the movement of the bimetal is necessary even if the temperature of the oil changes. However, it is difficult to lock it because the working medium is the volume change of the thermal expansion body. Therefore, in order to provide the fail-safe mechanism, it is necessary to mount the same specifications having different operating temperatures, which makes it impossible to make the device compact.

Further, the relief valve is provided in the hydraulic circuit in case the hydraulic pressure rises, but this requires a check valve and its circuit, which complicates the circuit.

The present invention has been made in view of the above problems, and can open and close the oil flow path even with a small temperature difference, has good responsiveness, and can improve the accuracy of operating temperature and reduce cost. Another object is to provide a bimetal type oil switching valve that can be made compact even if it has a fail-safe mechanism and that can simplify the circuit even if it has a relief function.

[0010]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a valve body on a bimetal that operates by temperature change, and attaches the valve body and the bimetal to a guide body having a flow path opening portion to form a valve body. In a bimetal oil switching valve that moves the valve body to open and close the flow passage opening by the operation of, the flow passage opening is shortened in the moving direction of the valve body and lengthened in the direction orthogonal to the moving direction. The formed bimetal oil switching valve was constructed. It is preferable that the bimetal is an elongated one formed in a spiral shape from the center so that the coefficients of thermal expansion differ in the inward and outward directions.

Further, it is preferable to provide a fixing mechanism for fixing the bimetal to which the valve body is attached to the guide body at an arbitrary position, and it is preferable to form unevenness for positioning the valve body and the casing. A valve lock mechanism for engaging and fixing the valve body against excessive operation of the valve body may be provided in the valve body. Further, the valve body may include a relief valve.

[0012]

[Work]

 According to the present invention, the bimetal is activated by the temperature change of the oil and the valve body is moved. Due to the movement of the valve body, the flow path opening is opened and closed. Since this flow path opening is short in the moving direction of the valve body and long in the direction orthogonal to the moving direction, the moving distance of the valve body for opening and closing the flow path opening can be shortened. There is. Therefore, even if the amount of displacement of the bimetal is small, the flow path opening can be opened and closed with respect to a small temperature change of the oil, and the responsiveness and the like can be improved.

[0013]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 of the drawings is a front sectional view of a bimetal type oil switching valve, FIG. 2 is a plan sectional view of a bimetal type oil switching valve, FIG. 3 is a plan view of a casing, FIG. 4 is a plan view of a valve body, and FIG. 6 is a left side view of FIG. 4, FIG. 7 is a right side view of FIG. 4, FIG. 8 is a side view showing a flow path opening of another valve body, and FIG. 9 is FIG. 10 is a bottom view of FIG. 10, FIG. 10 is a side view showing a flow passage opening of another valve body, FIG. 11 is a bottom view of FIG. 10, FIG. 12 is a front sectional view showing a caulking part of another valve body, and FIG. 12 is a bottom view of FIG. 12, FIG. 14 is a front sectional view showing a caulking portion, FIG. 15 is an enlarged perspective view of an essential part showing a valve lock mechanism, FIG. 16 is a plan view of a valve body showing a valve locking mechanism, and FIG. FIG. 16 is a sectional view taken along the line XVII-XVII, and FIG. 18 is a bimetal oil switching valve equipped with a relief valve. Ru front cross-sectional view der.

As shown in FIGS. 1, 2 and 3, the bimetal type oil switching valve A is composed of a casing 1 and a valve body 2 housed in the casing 1. The casing 1 is composed of a casing body 5 having oil outlets 3 and 4 formed on both sides thereof, and a casing lid 7 having an oil inlet 6 provided therein, and oil passages are formed in the outlets 3 and 4, respectively. Pipes 8 and 9 are attached.

As shown in FIGS. 1, 2 and 4 to 7, the valve body 2 has a substantially spiral bimetal 11 that operates by a temperature change, and a substantially bottomed semi-cylindrical shape (bottomed bottom) that is moved by the bimetal 11. It is composed of a valve body 12 (a shape obtained by dividing a cylinder in half vertically) and a guide body 13 having a substantially bottomed cylindrical shape that houses the bimetal 11 and the valve body 12. The bimetal 11 and the valve body 12 are fixed at arbitrary positions. It is attached to the guide body 13 by the mechanism B.

The bimetal 11 is an elongated shape formed in a spiral shape from the center so that the coefficients of thermal expansion differ in the inward and outward directions, and the central end of the bimetal 11 is attached to the center of the bottom plate of the guide body 13 for the shaft of the fixing mechanism B. It is fixed to 14, and the valve body 12 is attached to the other end. In the case of this bimetal 11, it is wound clockwise (clockwise), the inner metal has a larger coefficient of thermal expansion than the outer metal, and the center end thereof is fixed. Therefore, when the oil temperature rises, the other end (outer peripheral end) operates counterclockwise (counterclockwise), and when the oil temperature falls, the other end operates clockwise. If the other end is fixed, the operation will be reversed.

The valve body 12 is formed so that its outer diameter is slightly smaller than the inner diameter of the guide body 13, and moves along the inner peripheral surface of the guide body 13 by the operation of the bimetal, that is, it rotates around the shaft 14 as a center. It is arranged to move. Oil passage openings 16 and 17 are formed on both sides of the peripheral wall of the guide body 13, and the valve body 12 of the oil passage openings 16 and 17 rotates along the inner peripheral surface of the guide body 13. It is designed to open and close.

As shown in FIGS. 6 and 7, the flow path openings 16 and 17 are formed in a rectangular shape (which may be an ellipse or the like) which is short in the circumferential direction and long in the axial direction. That is, the valve body 12 is formed to be short in the moving direction and long in the direction orthogonal to the moving direction. Thereby, the flow path openings 16 and 17 can be opened and closed even if the moving distance of the valve body 12 is short. Therefore, a large amount of oil can be controlled even with a small oil temperature difference, and a large amount of oil can be controlled even with a small bimetal angular displacement.

When controlling a larger flow rate of oil, in addition to the flow passage openings 16a and 17a formed in the peripheral wall of the guide body 13, as in the valve body 2a shown in FIGS. 8 and 9, The flow passage openings 21 and 22 may be formed on the bottom surface of the guide body 13, and at this time, the valve body also allows the flow passage openings 21 and 22 on the bottom surface to be opened and closed. Then, as in the valve main body 2b shown in FIGS. 10 and 11, the flow path openings 16b and 17b formed in the peripheral wall of the guide body 13 may be extended to the bottom surface of the guide body 13.

A substantially ring-shaped brim 18 is provided on the outer periphery of the opening edge of the upper portion of the guide body 13. The brim 18 is provided with a concave groove 19 that engages with the convex 10 provided in the casing body 5. Has been formed. The convex portion 10 and the concave groove 19 are used for positioning when the valve body 2 is attached to the casing 1, so that the direction of the discharge ports 3 and 4 of the casing 1 and the flow passage opening portions 16 and 17 of the casing 1 can be determined. The orientation of the oil can be easily adjusted and the direction of the oil flow passage can be determined. Further, it is possible to prevent the valve body 2 from moving or rattling in the casing 1.

As shown in FIGS. 4 and 5, the fixing mechanism B includes a rotatable shaft 14 to which a center end of bimetal is attached, and a nut 15 which is screwed to a male screw portion formed at the tip of the shaft 14. The nut 15 is screwed into the male screw portion of the shaft 14 through the bottom plate of the guide body 13, whereby the shaft 14 is fixed to the center of the bottom plate of the guide body 13, and the valve body 12 and the bimetal 11 are attached. It can be fixed at any rotation position. In assembling the valve body 12 and the bimetal 11 to the guide body 13, the bimetal 11 operates within a specified temperature, so that the valve body 12 opens and closes the flow passage openings 16 and 17, so that the assembly is performed. After the valve body 12 and the bimetal 11 are rotated with the ambient temperature at the time of attachment to X degrees, the valve body 12 is aligned with the marking S provided on the bottom surface or the inner peripheral surface of the guide body 13, and then the nut It is designed to be attached by tightening 15. This makes it possible to reduce the initial variation during assembly. Further, when the nut 15 is loosened, the shaft 14 can be rotated, so that the position of the valve body 12 can be finely adjusted and readjusted.

Further, the shaft 14 may be fixed by caulking the tip portion 14a of the shaft 14 as in a fixing mechanism B1 shown in FIG. In this case, like the fixing mechanism B2 shown in FIGS. 12 and 13, it is preferable to form a recess 13a having a different diameter or a square shape in the center of the bottom plate of the guide body 13. The tip portion 14a of the shaft 14 can be crimped and crushed in the recess 13a to prevent the shaft 14 from rotating. In the case of the nut (hexagonal nut in this case) 15, the recess may have the same shape.

Next, the valve body 30 including the valve lock mechanism C as shown in FIGS. 16 and 17 will be described. The valve body 30 accommodates a substantially spiral-shaped bimetal 31 that operates by a change in oil temperature, a substantially fan-shaped (or substantially arc-shaped) valve body 32 that operates by the bimetal 31, and the bimetal 31 and the valve body 32. And a valve block mechanism C that locks the valve body 32 when the oil temperature rises excessively. The bottom plate of the guide body 33 is opened and closed by the valve body 32. A flow path opening 35 is formed.

The bimetal 31 is an elongated shape formed in a spiral shape from the center so that the coefficients of thermal expansion differ in the inward and outward directions, and the other end is fixed to a block 34 attached to the bottom plate of the guide body 33. Yes, the valve element 32 is attached to the center end. In the case of this bimetal 31, it is wound counterclockwise, the inner metal has a larger coefficient of thermal expansion than the outer metal, and the other end (outer peripheral end) is fixed. Therefore, when the oil temperature rises, its center end operates counterclockwise (counterclockwise), and when the oil temperature falls, its center end operates clockwise. Therefore, when the oil temperature rises, the valve body 32 rotates counterclockwise, and when the oil temperature falls, the valve body 32 rotates clockwise.

As shown in FIGS. 15, 16 and 17, the valve lock mechanism C is a notch piece 36 formed by notching the bottom plate of the guide body 33, and the notch piece 36 locks the tip of the valve body 32. Is formed in position. Reference numeral 36a in the drawing denotes a cutout hole after the cutout piece 36 is formed and bent upward. Further, a valve stopper 37 is provided at a position facing the cutout piece 35 with the flow path opening 35 interposed therebetween. When the temperature of the oil rises excessively, the valve element 32 operates excessively, the tip of the valve element 32 rides over the notch piece 36, and the tip of the valve element 32 engages and is fixed to the notch piece 36. As a result, the valve body 32 can be fixed and the flow path opening 35 can be kept closed even if the temperature of the oil changes. When the flow path opening 35 is opened when the oil temperature is excessive, the valve lock mechanism C may be provided at the open position of the valve body 32.

Next, a bimetal type oil switching valve D provided with a relief valve E as shown in FIG. 18 will be described. The bimetal type oil switching valve D includes a substantially bottomed cylindrical casing 41, a valve body 42 housed in the casing 41, and a relief valve E provided in the valve body 42. The casing 41 has an oil inlet port 44 at the upper opening, and an oil outlet port 43 formed on the peripheral wall.

The valve body 42 accommodates a substantially spiral-shaped bimetal 51 that operates according to a change in oil temperature, a substantially bottomed semi-cylindrical valve body 52 that rotates by the bimetal 51, a bimetal 51 and a valve body 52. The guide body 53 has a substantially bottomed cylindrical shape, and the by-metal 51 and the valve body 52 are similar to the bimetal 11 and the valve body 12 described above, and operate in the same manner. Further, an oil passage opening 55 that is opened and closed by the valve body 52 is formed on the peripheral wall of the guide body 53, and a cylindrical body 71 having a passage opening 72 is provided on the bottom surface of the guide body 53. There is. The shaft 54 to which the central end of the bimetal 51 is fixed is attached to the center of the bottom plate of the guide body 53 by screwing the male screw portion formed at the tip thereof to the fixed female screw body 70. Is provided with a relief valve E.

The relief valve E includes a substantially cylindrical shaft 54 that serves as a relief valve body, a relief valve body 61 that opens and closes a lower end opening of the shaft 54, an operating rod 62 that operates the relief valve body 61, and a shaft at one end. 54, and a spring 64 attached to the movable plate 63, the other end of which is slidable within the shaft 54. A relief valve body 61 is attached to the lower end of the operating rod 62, and a movable plate 63 is attached to the upper end thereof. The spring 64 retracts between the stepped portion in the shaft 54 and the movable plate 63 so that the relief valve body 61 is biased in the closing direction (upward direction) so that the lower end opening of the shaft 54 is always closed. Are provided. The relief valve E is designed to operate when the pressure of the oil becomes high when the flow passage opening 55 is closed by the valve body 52 at the specified temperature of the oil, and the operation is performed by the relief valve. 61 moves downward against the spring 64 to open the lower end opening of the shaft 54. As a result, it is not necessary to provide a circuit for the relief valve, and the hydraulic circuit can be simplified.

The present invention is not limited to the above-mentioned embodiment, and for example, the example in which the spiral bimetal is used as the slide valve has been described, but a plate-shaped bimetal can also be used. Further, although the casing is used in this embodiment, the valve body may be directly provided in the partner engine block and the mission.

[0030]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it has the following effects. Since the flow passage opening is shortened in the moving direction of the valve body and formed long in the direction orthogonal to the moving direction, the moving distance of the valve body for opening and closing the flow passage opening is shortened and the displacement of the bimetal is reduced. Even if the amount is small, it is possible to open and close the flow path opening portion with respect to a small temperature change of oil. Therefore, responsiveness is good and fine control is possible. Further, since the bimetal is formed in a spiral shape, the displacement amount can be increased.

Further, in the case where the fixing mechanism for fixing the bimetal to which the valve body is attached to the guide body at an arbitrary position is provided, the valve body and the bimetal can be fixed at the arbitrary position by the fixing mechanism. Since the position of the flow path can be changed, it is possible to adjust the opening and closing of the flow path at the specified temperature even with bimetal having a large error. Therefore, the accuracy of the operating temperature can be improved and the leak amount can be reduced.

In the case where the valve main body and the casing are provided with the unevenness for positioning, the directionality of the flow path and the like can be easily determined by fitting the unevenness formed on the valve main body and the casing. Therefore, it is possible to reduce the number of marking steps that determine the directionality and the number of parts such as bolts. In addition, it does not take time and labor to prepare a dedicated casing for determining the directionality of the flow path, etc., and it is possible to suppress an increase in cost and the like. Also, problems such as incorrect assembly can be solved.

Further, in the valve body provided with the valve lock mechanism for engaging and fixing the valve body against excessive operation of the valve body, it is not necessary to mount the same specifications having different operating temperatures, Can be made compact.

Further, in the case where the valve body is provided with the relief valve, the check valve and the circuit for the relief valve are unnecessary, and the hydraulic circuit can be simplified.

[Brief description of drawings]

FIG. 1 is a front sectional view of a bimetal oil switching valve according to an embodiment of the present invention.

FIG. 2 is a plan sectional view of a bimetal type oil switching valve according to an embodiment of the present invention.

FIG. 3 is a plan view of a casing according to an embodiment of the present invention.

FIG. 4 is a plan view of a valve body according to an embodiment of the present invention.

5 is a sectional view taken along line VV of FIG. 4 according to an embodiment of the present invention.

FIG. 6 is a left side view of FIG. 4 according to an embodiment of the present invention.

FIG. 7 is a right side view of FIG. 4 according to an embodiment of the present invention.

FIG. 8 is a side view showing a flow path opening portion of another valve body according to the embodiment of the present invention.

9 is a bottom view of FIG. 8 according to an embodiment of the present invention.

FIG. 10 is a side view showing a flow path opening portion of another valve body according to the embodiment of the present invention.

11 is a bottom view of FIG. 10 according to an embodiment of the present invention.

FIG. 12 is a front sectional view showing a caulking portion of another valve body according to the embodiment of the present invention.

13 is a bottom view of FIG. 12 according to an embodiment of the present invention.

FIG. 14 is a front sectional view showing a caulking portion according to the embodiment of the present invention.

FIG. 15 is an enlarged perspective view of an essential part showing a valve lock mechanism according to an embodiment of the present invention.

FIG. 16 is a plan view of a valve body showing a valve lock mechanism according to an embodiment of the present invention.

FIG. 17 is an XVII-XVII of FIG. 16 according to an embodiment of the present invention.
It is a line sectional view.

FIG. 18 is a front sectional view of a bimetal type oil switching valve including a relief valve according to an embodiment of the present invention.

[Explanation of symbols]

A, D: Bimetal type oil switching valve B, B1, B2: Fixed mechanism C: Valve lock mechanism E: Relief valve 1,41: Casing 2, 2a, 2b, 2c, 2d, 30, 42: Valve body 3, 4 , 43: Discharge port 5: Casing body 6,44: Inlet port 7: Casing lid 8, 9: Pipe 10: Convex part 11, 31, 51: Bimetal 12, 32, 52: Valve body 13, 33, 53: Guide Body 13a: Recessed portion 14, 54: Shaft 14a: Tip portion 15: Nut 16, 16a, 16b, 17, 17a, 17b, 21,
22, 35, 55, 72: Flow path opening 18: Collar 19: Recessed groove 34: Block 36: Notch piece 36a Notch hole 37: Valve stopper 61: Relief valve disc 62: Actuating rod 63: Movable plate 64: Spring 70: Fixed female screw body 71: Cylindrical body

Claims (6)

[Scope of utility model registration request] 1. A valve body is provided on a bimetal which is actuated by a temperature change, and the valve body and the bimetal are attached to a guide body having a flow path opening portion to form a valve body. In a bimetal oil switching valve that moves to open and close a flow passage opening, the flow passage opening is formed to be short in the moving direction of the valve body and long in the direction orthogonal to the moving direction. Bimetal oil switching valve. 2. The bimetal type oil switching valve according to claim 1, wherein the bimetal is an elongated shape and is formed in a spiral shape from the center so that the coefficients of thermal expansion differ in the inward and outward directions. 3. The bimetal oil switching valve according to claim 1, further comprising a fixing mechanism for fixing the bimetal to which the valve body is attached to the guide body at an arbitrary position. 4. The bimetal type oil switching valve according to claim 1, wherein the valve main body and the casing are provided with an unevenness for positioning. 5. The bimetal type oil switching according to claim 1, wherein the valve body is provided with a valve lock mechanism that engages and fixes the valve body against excessive operation of the valve body. valve. 6. The bimetal type oil switching valve according to claim 1, wherein said valve body is provided with a relief valve.