Electrically operated valve

Abstract

An electrically actuated valve comprises a feed spindle mechanism for advancing and retracting a valve body in an axial direction towards a valve seat, a rotor rotatably mounted on the inner circumference of a can and driven by a stator located on the outer circumference of the can, a reduction gear with several planetary gear mechanisms arranged in the axial direction, wherein the torque is transmitted sequentially from the side furthest from the feed spindle mechanism in the several planetary gear mechanisms to the side closest to the feed spindle mechanism, and the torque is transmitted to the feed spindle mechanism by reducing the rotational speed of the rotor, and a reducing means that reduces the pressure acting on a gear of a third planetary gear mechanism.

Description

Technical field

[0001] The present invention relates to an electrically operated valve. background

[0002] In the motor-driven valve with reduction gear disclosed in Japanese patent application no. 2006-226369, a valve stem with a valve body is inserted into the main body of the motor-driven valve. A rotor is installed in a housing attached to the main body, and a reduction gear is housed within the rotor. The rotor's output is transmitted to a sun gear and then to planet gears. The planet gear meshes simultaneously with a fixed gear and an output gear, and the output gear is driven at a high reduction ratio. The output of the output gear is transmitted via a driver to a screw shaft, converted into linear motion, and then transmitted to a valve stem. Summary of the invention: Technical problem

[0003] In the case of an electrically operated valve that has several planetary gear mechanisms as reduction gears that transmit torque to the feed spindle mechanism, it should be considered that the gear of the planetary gear mechanism located on the side closest to the feed spindle mechanism will be damaged, making it impossible to open and close the electrically operated valve.

[0004] To address the aforementioned concerns, the present disclosure aims to provide a technique for an electrically actuated valve with multiple planetary gear mechanisms as a reduction gear, suppressing damage to the gear in a planetary gear mechanism located on the side closest to the feed spindle mechanism. Solution to the problem

[0005] An electrically actuated valve according to a first aspect comprises a valve body with a valve chamber and a valve seat, a can extending in an axial direction and having a cylindrical shape and arranged on one side of the valve body in the axial direction, a valve body arranged within the valve chamber, a feed spindle mechanism for advancing and retracting the valve body in the axial direction towards the valve seat, a rotor rotatably mounted on the inner circumference of the can, a reduction gear with several planetary gear mechanisms arranged in the axial direction, wherein the torque is applied successively from the side furthest from the feed spindle mechanism in the several planetary gear mechanisms to the side closest to the feed spindle mechanism.is transmitted and the torque is transferred to the feed spindle mechanism by reducing the rotational speed of the rotor, and a means of reducing that reduces the pressure acting on a gear of a planetary gear mechanism located on the side closest to the feed spindle mechanism.

[0006] In an electrically actuated valve comprising a reduction gear with multiple planetary gear mechanisms, the greatest torque is generally exerted on the gear of the planetary gear mechanism located on the side closest to the feed spindle mechanism. This electrically actuated valve, in the case of multiple planetary gear mechanisms, includes a reducing means that reduces the pressure on one of the planetary gear mechanisms located on the side closest to the feed spindle mechanism.This results in an electrically actuated valve being provided, in contrast to a case where the planetary gear mechanism, which is located on the side closest to the feed spindle mechanism in a reduction gear with multiple planetary gear mechanisms, is similar to other planetary gear mechanisms, thus suppressing damage to a speed reduction mechanism.

[0007] An electrically actuated valve according to a second aspect is in the electrically actuated valve according to the first aspect the means for reducing is constructed such that a planetary gear mechanism, which is arranged among the several planetary gear mechanisms on the side furthest from the feed spindle mechanism, and a planetary gear mechanism, which is arranged on the side closest to the feed spindle mechanism, have different specifications of the gears.

[0008] In this electrically actuated valve, in the reducing means with multiple planetary gear mechanisms, a planetary gear mechanism located on the side furthest from the feed spindle mechanism and a planetary gear mechanism located on the side closest to the feed spindle mechanism have different gear specifications, and the pressure of the planetary gear mechanism located on the side closest to the feed spindle mechanism is reduced.This results in an electrically actuated valve being provided, which suppresses damage to a speed reduction mechanism, in comparison to a case where the specifications of the gears of the planetary gear mechanism, which is located on the side closest to the feed spindle mechanism in a reduction gearbox with multiple planetary gear mechanisms, are similar to other planetary gear mechanisms.

[0009] An electrically actuated valve according to a third aspect has in the electrically actuated valve according to the second aspect the planetary gear mechanisms in which torque is transmitted to the sun gear and torque is delivered from the planet carrier, and in the axially adjacent planetary gear mechanisms, a planetary gear mechanism that is located on the side closer to the feed spindle mechanism has a larger tooth width of the sun gear and the planet gear than that of the other planetary gear mechanism that is located on the side further away from the feed spindle mechanism.

[0010] This electrically actuated valve reduces the pressure on the gears of one planetary gear mechanism located on the side closer to the feed spindle mechanism. This is because one planetary gear mechanism has a larger tooth width for both the sun gear and the planet gear than the other planetary gear mechanism located on the side further away from the feed spindle mechanism. Therefore, this electrically actuated valve prevents damage to one of the planetary gear mechanisms.

[0011] An electrically actuated valve according to a fourth aspect has in the electrically actuated valve according to the second aspect or the third aspect a planetary gear mechanism which is arranged on the side closest to the feed spindle mechanism, having a larger tooth width of the sun gear and the planet gear than that of the other planetary gear mechanism which is arranged on the side furthest from the feed spindle mechanism.

[0012] In this electrically actuated valve, the gears of the planetary gear mechanism located on the side closest to the feed screw mechanism have a larger tooth width for both the sun gear and the planet gear than those of the gears of the other planetary gear mechanism located on the side furthest from the feed screw mechanism. Therefore, compared to the gears of the planetary gear mechanism located on the side furthest from the feed screw mechanism, the pressure on the gears of the planetary gear mechanism located on the side closest to the screw conveyor mechanism is reduced. Consequently, this electrically actuated valve prevents damage to the planetary gear mechanism located on the side closest to the feed screw mechanism.

[0013] An electrically actuated valve according to a fifth aspect has in the electrically actuated valve according to the second aspect the several planetary gear mechanisms in which torque is transmitted to the sun gear and torque is delivered by the planet carrier, and in the axially adjacent planetary gear mechanisms, a planetary gear mechanism located on the side closer to the feed spindle mechanism has a larger module than another planetary gear mechanism located on the side further away from the feed spindle mechanism.

[0014] This electrically actuated valve reduces the pressure on the gears of the planetary gear mechanism located on the side closer to the feed spindle mechanism, because this planetary gear mechanism has a larger gear module than the other. Therefore, this electrically actuated valve prevents damage to this planetary gear mechanism.

[0015] An electrically actuated valve according to a sixth aspect has in the electrically actuated valve according to the second aspect or the fifth aspect that a planetary gear mechanism located on the side closest to the feed spindle mechanism has a larger module than that of the other planetary gear mechanism located on the side furthest from the feed spindle mechanism.

[0016] In this electrically actuated valve, the planetary gear mechanism located on the side closest to the feed spindle mechanism has a higher impact resistance in its gears than in the other planetary gear mechanisms. This is because the planetary gear mechanism located on the side furthest from the feed spindle mechanism also has a large module. Therefore, according to this electrically actuated valve, damage to the planetary gear mechanism located on the side closest to the feed spindle mechanism is suppressed.

[0017] An electrically actuated valve according to a seventh aspect is in the electrically actuated valve according to the first aspect the means for reducing is constructed such that in the planetary gear mechanism which is arranged on the side closest to the feed spindle mechanism, a planet carrier transmits torque and a sun gear delivers torque.

[0018] This electrically actuated valve encompasses the planetary gear mechanism located on the side closest to the feed spindle mechanism and features gears, with a planet carrier transmitting torque and the sun gear delivering torque. This reduces the pressure on the gears of the planetary gear mechanism located on the side closest to the feed spindle mechanism. Therefore, according to this electrically actuated valve, damage to the planetary gear mechanism located on the side closest to the feed spindle mechanism is prevented.

[0019] An electrically actuated valve according to an eighth aspect comprises, in the electrically actuated valve according to one of the first to seventh aspects, a stator which is arranged on the outer circumference of the can and drives the rotor in a rotating manner. Advantageous effects of the invention

[0020] According to the present invention, in an electrically actuated valve with several planetary gear mechanisms as a reduction gear, a technique for an electrically actuated valve is provided which suppresses damage to the gears in the planetary gear mechanism that is located on the side closest to the feed spindle mechanism. List of characters Fig. Figure 1 is a sectional view showing an electrically actuated valve according to a first embodiment. Fig. Figure 2 is an enlarged view of the reduction gear in the electrically actuated valve according to the first embodiment. Fig. Figure 3 is an enlarged view of the reduction gear in the electrically actuated valve according to the second embodiment. Fig. Figure 4 is an enlarged view of the reduction gear in the electrically actuated valve according to the third embodiment. Description of the embodiments

[0021] An example of an embodiment of the present disclosure is described below with reference to the drawings. In each drawing, the same reference numerals are used for identical or equivalent components and parts. Furthermore, for the sake of simplicity, the dimensions in the drawings may be exaggerated and may differ from the actual dimensions.

[0022] Furthermore, in the embodiment of the present disclosure, an axial direction refers to the direction in which a shaft body 44 of the reduction gear 50 extends. [First embodiment](construction)

[0023] An electrically actuated valve 10 according to a first embodiment of the present disclosure is described with reference to Fig. 1 and Fig. 2 described. The electrically operated valve 10 is used, for example, in a cooling circuit of an air conditioner or the like to adjust the flow rate of fluid (refrigerant). As described in Fig. 1 and Fig. As shown in Figure 2, the electrically actuated valve 10 according to the present embodiment adjusts the flow rate of the fluid flowing from the inlet port 11, which is connected to the valve body 14, to the outlet port 12 by the opening amount of the port 18. The electrically actuated valve 10 according to the present embodiment comprises a valve body 14, a valve body 22, an adjusting mechanism 21, and an actuating mechanism 33. (Valve body 14)

[0024] The main valve body 14 is an essentially cylindrical body with a laterally formed inlet opening 11, as shown in Fig. 1 shown. The various components described above, which define the valve body 22 on one side in the axial direction (the upper side of the drawing in Fig. 1) Drive, are on the other side in the axial direction connected to the drain pipe 82 to the outlet opening 12 (the lower side in the drawing in Fig. 1) Furthermore, on one side of the valve main body 14 in the radial direction (the left side in Fig. 1) An inlet port 11 is formed, and an inlet pipe 80 is connected to the inlet port 11. The valve body 22 is housed in the valve chamber 16, which is a space formed inside the main valve body 14, and is movable in the axial direction by a drive mechanism 33. Between the valve chamber 16 and the outlet port 12, the opening 18 is formed with a smaller diameter than the outlet port 12. The circumference of the opening 18 is a valve seat 20, which is in contact with a valve body 22, which will be described later, and the opening amount (flow path area through which fluid flows) of the opening 18 is set by the valve body 22, as described later. (Adjustment mechanism 21)

[0025] The adjusting mechanism 21 is arranged in the valve chamber 16 and comprises a valve body 22 which adjusts the opening amount of the opening 18, a guide section 23 which guides the valve body 22, a piston 30 which is connected to one side of the valve body 22 in the axial direction, and a feed spindle mechanism 24 which is arranged on one side of the piston 30 in the axial direction.

[0026] As in Fig. As shown in Figure 1, the valve body 22 is a substantially cylindrical element extending in the axial direction, with its outer diameter being larger in the axial direction than the inner diameter of the opening 18. By closing off the opening 18 against the valve seat 20, which the other side abuts in the axial direction, the valve chamber 16 and the outlet opening 12 are separated. That is, the valve body 22 is arranged such that it can open and close the opening 18.

[0027] As in Fig. As shown in Figure 1, the guide section 23 is a stepped cylindrical element whose diameter decreases axially on one side and which is fixed on one side axially to the valve chamber 16 in the valve main body 14. The guide section 23 is in contact with the valve body 22 at the inner circumferential surface of the reduced-diameter section and guides the movement of the valve body 22 in the axial direction. Furthermore, a compression spring 32 is located on one side axially of the reduced-diameter section of the guide section 23 and supports the other side axially.

[0028] The piston 30 is an element that engages the valve body 22 on one side in the axial direction and on the other side in the axial direction. It is moved axially towards one side relative to the guide section 23 by a compression spring 32 arranged radially on the outside. Furthermore, the piston 30 is in axial contact with a spindle 26 of the feed spindle mechanism 24 via a ball on one side, as will be described later.

[0029] As will be described later, the feed spindle mechanism 24 converts the torque delivered by the reduction gear 50 of the drive mechanism 33, which is arranged on an axial side of the valve body 14, into a linear movement in the axial direction. As described in Fig. As shown in Figure 1, the feed spindle mechanism 24 comprises a nut 28 which is attached to the valve main body 14, and a spindle 26 which is arranged radially inside the nut 28 and which receives on one side in the axial direction the torque delivered by the reduction gear 50.

[0030] As in Fig. As shown in Figure 1, the nut 28 is an essentially cylindrical element with an internal thread formed on its radially inner circumferential surface, and the spindle 26 is in rotatable contact with the internal thread.

[0031] The spindle 26 is an essentially cylindrical element extending axially and having an external thread on the other side in the axial direction, which engages with the internal thread of the nut 28. When the spindle 26 receives a torque in the axial direction from one side and rotates about the central axis O of the shaft body 44, it moves linearly in the axial direction while being guided by the internal thread of the nut 28. Furthermore, the spindle 26 transmits a linear motion to the piston 30 by making axial contact with the piston 30 via a ball on the other side.The spindle 26 is not limited to a specific shape, as long as it can absorb the torque delivered by the reduction gear 50 and is movable in the axial direction, and in the present embodiment, by way of example, the gear machining is carried out at the end on one side in the axial direction. (Drive mechanism 33)

[0032] As in Fig. 1 and Fig. As shown in Figure 2, the drive mechanism 33 comprises a cover 46, a can 48, a motor 34, a shaft body 44 and a reduction gear 50.

[0033] The cover 46 is an element that is arranged on one side of the valve main body 14 in the axial direction and covers the motor 34, the can 48 and the reduction gear 50, as will be described later.

[0034] As in Fig. 1 and Fig. As shown in Figure 2, the can 48 is an axially extending cylindrical element that accommodates a rotor 42, a shaft support element 45, a shaft body 44, and a reduction gear 50, which will be described later, and is connected on the other side in the axial direction to the main valve body 14 by a connecting material 49. One side of the can 48 is integrated in the axial direction into a pouch-like shape, and in the present embodiment, the can 48 is also an element that covers the main valve body 14 from one side in the axial direction. The can 48 may be made of any material, as long as the material does not shield the magnetic field; an aluminum alloy is used as an example.

[0035] The shaft support element 45 is attached to the can 48 on one side in the axial direction inside the can 48, as shown in Fig. 1 and Fig. Figure 2 shows that the shaft support element 45 non-rotatably supports one end in the axial direction of a shaft body that extends axially from one side of the drive mechanism 33 to the other side. The shaft body 44 is an element that defines the axes of rotation of the motor 34 and the reduction gear 50. In the present embodiment, the shaft body 44 also rotatably supports the spindle 26 of the feed spindle mechanism 24.

[0036] Motor 34, for example, is a claw-pole stepper motor whose angle of rotation and speed are controlled by a driver not shown in the figure. Motor 34 comprises a stator 36, which is arranged outside the housing 48, and a rotor 42, which is arranged further inside than the housing 48.

[0037] Although the electrically operated valve 10 in Fig. Figure 1 is shown in a state where the stator 36 is arranged outside the can 48. The stator 36 can be easily mounted and dismounted with respect to the can 48, and it is often referred to as the electrically actuated valve 10 in a state where the stator 36 is dismounted. Therefore, the electrically actuated valve 10 in the present disclosure includes both a state where the stator 36 is not provided and a state where the stator 36 is provided.

[0038] The stator 36 is an example of a rotary means according to the present disclosure, which rotates the rotor 42, and as in Fig. As shown in Figure 1, it comprises an A-phase stator 36A and a B-phase stator 36B, which are arranged coaxially and parallel in the axial direction on the outer circumference of the can 48. The number of coils contained in the stator 36 is determined according to the specifications of the electrically actuated valve 10 and the motor 34. Furthermore, in the present embodiment, the stator 36 can be configured to be separable from the can 48. That is, the electrically actuated valve 10 in the present disclosure can have a design that does not include the stator 36. In such a design, for example, the parts of the electrically actuated valve 10, with the exception of the stator 36, and the stator 36 itself can be shipped separately and assembled at the place of use as the electrically actuated valve 10. Moreover, in such a configuration, it is also possible, for example, to replace the stator 36 with one having a different specification.

[0039] The rotor 42 is a rotating element driven by a rotating means and comprises several permanent magnets 41 extending axially and having alternating S-poles and N-poles arranged circumferentially. It is arranged radially in the inner circumference of the housing 48 relative to the stator 36 so that it can rotate with respect to the shaft body 44. Furthermore, the permanent magnets 41 are rotatably mounted radially on the inside of the shaft body 44 and a first sun gear 54A, which is an input side for the torque of a reduction gear 50, which will be described later. When the respective coils of the A-phase stator 36A and the B-phase stator 36B are energized, the respective permanent magnets 41 arranged on the rotor 42 are attracted or repelled by the respective coils and thus driven to rotate circumferentially. (Reduction gear 50)

[0040] As in Fig. As shown in Figure 1, the reduction gear 50 is a part that is coaxial with the rotor 42 and comprises several planetary gear mechanisms 52 arranged in the axial direction, wherein the rotational speed of the rotor 42 is reduced in order to transmit a torque to the feed spindle mechanism 24. In the present embodiment, it comprises three planetary gear mechanisms 52, namely a first planetary gear mechanism 52A, a second planetary gear mechanism 52B and a third planetary gear mechanism 52C, which are arranged side by side in the axial direction.In other words, the first planetary gear mechanism 52A is an example of the “planetary gear mechanism 52 that is arranged on the side furthest from the feed spindle mechanism 24” in the present disclosure, and the third planetary gear mechanism 52C is an example of the “planetary gear mechanism 52 that is arranged on the side closest to the feed spindle mechanism 24”. In still other words, the second planetary gear mechanism 52B is an example of the “planetary gear mechanism 52 that is arranged on the side furthest from the feed spindle mechanism 24” in relation to the third planetary gear mechanism 52C.Furthermore, the first planetary gear mechanism 52A is an example of a planetary gear mechanism 52 located on the side furthest from the feed spindle mechanism 24, in relation to the second planetary gear mechanism 52B and the third planetary gear mechanism 52C. Similarly, the second planetary gear mechanism 52B is an example of another planetary gear mechanism 52 located on the side closer to the feed spindle mechanism 24, in relation to the first planetary gear mechanism 52A. Furthermore, the third planetary gear mechanism 52C is an example of another planetary gear mechanism 52 located on the side closer to the feed spindle mechanism 24, in relation to the first planetary gear mechanism 52A and the second planetary gear mechanism 52B.

[0041] If each planetary gear mechanism 52 is to be described separately in the description of the present embodiment, A, B, or C is added to the end of the reference numerals to distinguish them. The first planetary gear mechanism 52A, the second planetary gear mechanism 52B, and the third planetary gear mechanism 52C each have a sun gear 54, a planet gear 56, a planet carrier 58, and an internal gear 60. If the components of each planetary gear mechanism 52 are to be specifically distinguished, A, B, or C is added to the end of the reference numerals to distinguish them. The planetary gear mechanism 52 in the present embodiment is in each case a 2K-H type gear mechanism.

[0042] Furthermore, the sun gear 54 is rotatably supported by the shaft body 44. The planet gears 56 mesh with the sun gear 54 and the internal gear 60, and several planet gears 56 are provided in the circumferential direction. These multiple planet gears 56 are rotatably supported by the planet carrier 58. In addition, the first sun gear 54A is formed integrally with the other side in the axial direction of the rotor 42 (a bearing section on a flat plate on one side in the axial direction, which is supported by the shaft body 44). The second sun gear 54B is formed integrally with the other side in the opposite direction of the first planet carrier 58A. The third sun gear 54C is formed integrally with the other side in the opposite direction of the second planet carrier 58B. As shown in Fig. 1 and Fig. Figure 2 shows that, for example, three planet gears 56 are provided in the planet carrier 58. Fig. 1 and Fig. Figure 2 shows the planet carrier 58 and the planet gear 56 in a rotational cross-sectional view, which is not the case in reality.

[0043] Furthermore, the third planet carrier 58C has a hole on the other side in the axial direction in which a groove is formed on the inside in the radial direction, which engages with the spindle 26 (gear machining part), whereby a torque can be transmitted through the engagement of the third planet carrier 58C and the spindle 26.

[0044] As in Fig. As shown in Figure 2, in the present embodiment, the internal gear 60 is a single element, namely a single gear in which the internal teeth are continuous in the axial direction. In other words, the first internal gear 60A, the second internal gear 60B, and the third internal gear 60C each refer to different parts of the single internal gear 60 in the axial direction. However, in the present embodiment, the internal gear 60 is not limited to being a single element and can be constructed in the axial direction as a first internal gear 60A, a second internal gear 60B, and a third internal gear 60C.

[0045] The material of each component of the planetary gear mechanism 52 is not subject to any particular restrictions. For example, the sun gear 54, the planet carrier 58, and the internal gear 60 are made of synthetic resin, and the planet gear 56 is made of a hard material such as metal. That is, the planet gear 56 is made of a different material than the sun gear 54 and the internal gear 60. In the present embodiment, the planet gear 56, the sun gear 54, and the internal gear 60 have teeth shaped like spur gears.

[0046] In the present embodiment, the internal gear 60 is attached to the valve body 14. Furthermore, the torque is transmitted axially from one side to the sun gear 54, and the planet carrier 58, to which the planet gear 56 is rotatably connected, transmits the torque axially to the other side. Thus, the planetary gear mechanism 52 in the present embodiment is a speed reduction mechanism.

[0047] The reduction gear 50 functions as a reduction gear by transmitting torque, based on the aforementioned rotary motion of the rotor 42, to the first planetary gear mechanism 52A, the second planetary gear mechanism 52B, and the third planetary gear mechanism 52C, in that order, with the torque being delivered by the third planetary gear mechanism 52C. In other words, the planet carrier 58 in the third planetary gear mechanism 52C transmits torque to the spindle 26 of the feed spindle mechanism 24, so that the reduction gear 50 transmits torque to the feed spindle mechanism 24.

[0048] The rotation of the internal gear 60 in the circumferential direction with respect to the can 48 and the valve main body 14 is restricted. Although there is no particular restriction regarding the method for regulating this rotation, in the present embodiment, for example, the other side of the internal gear 60 is connected to the can 48 and the valve main body 14 in the axial direction by a connecting material 49.

[0049] Furthermore, in the present embodiment, the first sun gear 54A and the second sun gear 54B are similar with respect to axial length, module, number of teeth, and other specifications. Furthermore, the first planet gear 56A and the second planet gear 56B are similar with respect to axial length, module, number of teeth, and other specifications. Furthermore, the first internal gear 60A and the second internal gear 60B are similar with respect to axial length, module, number of teeth, and other specifications. In other words, the specifications of the gears in the first planetary gear mechanism 52A and the specifications of the gears in the second planetary gear mechanism 52B are similar.

[0050] Here, as in Fig. As shown in Figure 2, in the present embodiment, the third sun gear 54C, the third satellite gear, and the third planet carrier 58C are longer in the axial direction than the first sun gear 54A, the first satellite gear, and the first planet carrier 58A. In other words, the tooth width of the gear in the third planetary gear mechanism 52C is larger than the tooth width of the gear in the first planetary gear mechanism 52A. The remaining specifications of the gears are the same as those of the first planetary gear mechanism 52A and the second planetary gear mechanism 52B.

[0051] The function and effect of the electrically actuated valve 10 according to the present embodiment will be explained below. (Function and effect)

[0052] In the reduction gear 50 with multiple planetary gear mechanisms 52, such as the reduction gear 50 of the electrically actuated valve 10 according to the present embodiment, the greatest torque is exerted on the sun gear 54 (i.e., the third sun gear 54C) of the planetary gear mechanism 52, which delivers the torque. When the torque exerted on the gears is high, the meshing parts of the gears tend to wear more quickly due to the pressure generated between the meshing gears. Therefore, in the electrically actuated valve 10 with multiple planetary gear mechanisms 52, the gear of the planetary gear mechanism 52 located on the side closest to the feed spindle mechanism 24 is more likely to be damaged.

[0053] The pressure exerted on the third sun wheel 54C is conceptually defined by the following formula. Pressure [Pa] = Torque delivered by the third sun gear 54C [N⋅m] ÷ (Radius of the pitch circle of the third sun gear 54C [m] × Contact area of ​​the tooth surface of the third sun gear 54C and the third planet gear 56C [m2])

[0054] In the third planetary gear mechanism 52C of the present embodiment, the tooth widths of the third sun gear 54C, the third planet gear 56C, and the third fixed gear are longer than those of the first sun gear 54A, the first planet gear 56A, and the first fixed gear. Therefore, the contact area of ​​the tooth surfaces of the third sun gear 54C and the third planet gear 56C is larger, and the pressure (load per unit area) exerted on the sun gear 54C of the third planetary gear mechanism 52C is lower than if the gears of the third planetary gear mechanism 52C had a similar shape to those of the first planetary gear mechanism 52A. In other words, the reducing mechanism in the present embodiment reduces the pressure exerted on the surface of the gear of the third planetary gear mechanism 52C by increasing the tooth width of the gear of the third planetary gear mechanism 52C.

[0055] In this electrically actuated valve 10, the pressure on the gears of the third planetary gear mechanism 52C is lower than when the gears of the third planetary gear mechanism 52C have a similar shape to the gears of the first planetary gear mechanism 52A, thus preventing damage to the third planetary gear mechanism 52C. In other words, in the electrically actuated valve 10 according to the present embodiment, the pressure on the gears of the third planetary gear mechanism 52C is reduced, thus preventing damage to the reduction gear 50. (Modified example)

[0056] This embodiment shows, but is not limited to, an example of a tooth width in the third planetary gear mechanism 52C that is longer than the tooth widths in the first planetary gear mechanism 52A and the second planetary gear mechanism 52B. For example, the tooth width of the gear in the second planetary gear mechanism 52B can be larger than the tooth width of the gear in the first planetary gear mechanism 52A. In this case, the pressure on the gears of the second planetary gear mechanism 52B is lower than if the gears of the first planetary gear mechanism 52A had the same shape as the gears of the second planetary gear mechanism 52B, thus preventing damage to the second planetary gear mechanism 52B.

[0057] Furthermore, in the above description, the internal gear 60 is fixed in the planetary gear mechanism 52, the sun gear 54 transmits torque, and the planet carrier 58 delivers torque, but this is not limited to these functions. For example, the sun gear 54 can be fixed circumferentially by the shaft body 44, and the internal gear 60, which is subdivided for each planetary gear mechanism 52, can be designed as a rotatable speed reduction mechanism. In this case, the planet carrier 58 is connected axially to the internal gear 60 on the other side, forming a speed reduction mechanism in which the internal gear 60 transmits the torque and the planet carrier 58 delivers the torque. [Second embodiment]

[0058] Next, an electrically actuated valve 10 according to a second embodiment of the present disclosure is described with reference to Fig. 3 described. In the electrically actuated valve 10 according to the second embodiment, the similar constructions as in the electrically actuated valve 10 according to the first embodiment are provided with the same reference numerals as in the first embodiment and their explanation is omitted. (Construction)

[0059] In contrast to the electrically actuated valve 10 according to the first embodiment, as shown in Figure 3, the third sun gear 154C according to the present embodiment has the same number of teeth as the first sun gear 54A, but a larger module. In other words, the third sun gear 154C has a larger diameter than the first sun gear 54A. Similarly, the third planet gear 156C has the same number of teeth as the first planet gear 56A, but a larger module, and the third internal gear 160C has the same number of teeth as the first internal gear 60A, but a larger module. Furthermore, the third planet carrier 158C, corresponding to the shape of the third sun gear 154C, rotatably supports the third planet gear 156C on its outer surface in the radial direction, relative to the first planet carrier 158A.

[0060] The remaining specifications of the gears in the third planetary gear mechanism 152C are the same as those of the first planetary gear mechanism 52A and the second planetary gear mechanism 52B. Furthermore, the remaining designs are similar to the design of the electrically actuated valve 10 according to the first embodiment.

[0061] The function and effect of the electrically actuated valve 10 according to the present embodiment will be explained below. (Function and effect)

[0062] When the actuating mechanism 33 is driven to adjust the opening amount of the orifice 18, the valve body 22 may strike the valve seat 20, or the feed and retraction speed of the valve body 22 may change rapidly, which can cause an impact on the adjusting mechanism 21. This impact is transmitted via the adjusting mechanism 21 to the gears of the planetary gear mechanism 152, which delivers a torque to the reduction gear 150. Therefore, in the electrically actuated valve 10 with multiple planetary gear mechanisms 152, the gear of the planetary gear mechanism 152 located on the side closest to the feed spindle mechanism 24 is more likely to be damaged.

[0063] In the third planetary gear mechanism 152C of the present embodiment, the modules of the third sun gear 154C, the third planet gear 156C, and the third fixed gear are larger than those of the first sun gear 54A, the first planet gear 56A, and the first fixed gear. Therefore, the tooth thickness of the gears of the third planetary gear mechanism 152C is greater, and the impact resistance of the third planetary gear mechanism 152C is increased, compared to when the gears of the third planet gear 152C have a similar shape to those of the first planet gear 52A. Furthermore, the increased gear module enlarges the contact area between the tooth faces of the third sun gear 154C and the third planet gear 156C.This means that, in the present embodiment, the reducing means reduces the pressure on the gears of the third planetary gear mechanism 152C by increasing the module of the gear of the third planetary gear mechanism 152C.

[0064] With this electrically actuated valve 10, the pressure on the gears of the third planetary gear mechanism 152C is lower than when the gears of the third planetary gear mechanism 152C have a similar shape to the gears of the first planetary gear mechanism 52A, thus preventing damage to the third planetary gear mechanism 152C. In other words, with the electrically actuated valve 10 according to the present embodiment, the pressure on the gears of the third planetary gear mechanism 152C is reduced, thus preventing damage to the reduction gear 150. (Modified example)

[0065] Furthermore, in the present embodiment, the module of the gear in the third planetary gear mechanism 152C is larger than, but not limited to, the module of the gear in the first planetary gear mechanism 52A and in the second planetary gear mechanism 52B. For example, the module of the gear in the second planetary gear mechanism 52B can be larger than the module of the gear in the first planetary gear mechanism 52A. In this case, the pressure on the gears of the second planetary gear mechanism 52B is lower than if the gears of the first planetary gear mechanism 52A had the same shape as the gears of the second planetary gear mechanism 52B, thus preventing damage to the second planetary gear mechanism 52B. [Third embodiment]

[0066] Next, an electrically actuated valve 10 according to a third embodiment of the present disclosure is described with reference to Fig. 4 described. In the electrically actuated valve 10 according to the third embodiment, the similar constructions as in the electrically actuated valve 10 according to the first embodiment are provided with the same reference numerals as in the first embodiment and their explanation is omitted. (Construction)

[0067] As in Fig.As shown in Figure 4, in this embodiment the second planet carrier 58B is integrated with the third planet carrier 258C on the other side in the axial direction, and the third sun gear 254C and the spindle 26 on the other side in the axial direction are engaged by projections and recesses not shown in the figure. In other words, in the third planetary gear mechanism 252C of the present embodiment, the torque delivered by the second planetary gear mechanism 52B is transmitted to the third planet carrier 258C, and the third sun gear 254C delivers the torque to the other side in the axial direction. Furthermore, the third internal gear 260C is attached in the same way as the first internal gear 60A and the second internal gear 60B. That is, in the present embodiment, the third planetary gear mechanism 252C delivers torque.In other words, in the reduction gear 250 of the present embodiment, the first planetary gear mechanism 52A and the second planetary gear mechanism 52B are speed reduction mechanisms, and the third planetary gear mechanism 252C is a speed increase mechanism. However, the reduction gear 50 as a whole is a gear that reduces the speed, so that the number of output revolutions is less than the number of input revolutions.

[0068] The remaining specifications of the gears in the third planetary gear mechanism 252C are the same as those of the first planetary gear mechanism 52A and the second planetary gear mechanism 52B. Furthermore, the remaining designs are similar to the design of the electrically actuated valve 10 according to the first embodiment.

[0069] The function and effect of the electrically actuated valve 10 according to the present embodiment will be explained below. (Function and effect)

[0070] As described above, in the case of the electrically operated valve 10 with multiple planetary gear mechanisms 252, it is more likely that the gear of the planetary gear mechanism 252, which is on the side closest to the feed spindle mechanism 24, will be damaged.

[0071] In this embodiment, in the third planetary gear mechanism 252C, the third planet carrier 258C applies torque and the third sun gear applies torque, making the third planetary gear mechanism 252C a speed-increasing mechanism. In other words, with the electrically actuated valve 10 in the present embodiment, the torque exerted on the gears is less than when the third planetary gear mechanism 252C, like the first planetary gear mechanism 52A and the second planetary gear mechanism 52B, is a speed-reducing mechanism. In other words, the reducing mechanism in the present embodiment reduces the pressure on the third planetary gear mechanism 252C, thus making the third planetary gear mechanism 252C a speed-increasing mechanism.

[0072] With this electrically actuated valve 10, the torque on the gear of the third planetary gear mechanism 252C is lower than when the gears of the third planetary gear mechanism 252C are a similar speed reduction mechanism to the gears of the first planetary gear mechanism 52A. In other words, with the electrically actuated valve 10 according to the present embodiment, the probability of damage to the planetary gear mechanism 252 is distributed between the third planetary gear mechanism 252C and the second planetary gear mechanism 52B. Therefore, according to the electrically actuated valve 10 in this embodiment, damage to the third planetary gear mechanism 252C is suppressed compared to a case in which the third planetary gear mechanism 252C is a similar planetary gear mechanism 52 to the first planetary gear mechanism 52A.In other words, with the electrically actuated valve 10 according to the present embodiment, damage to the reduction gear 250 is suppressed. (Modified example)

[0073] Furthermore, in the description above, the first planetary gear mechanism 52A and the second planetary gear mechanism 52B become speed reduction mechanisms, and the third planetary gear mechanism 252C becomes a speed increase mechanism, but is not limited to this. For example, only the first planetary gear mechanism 52A can be a speed reduction mechanism, and the second planetary gear mechanism 52B and the third planetary gear mechanism 252C can be speed increase mechanisms, as long as the reduction gear 250 as a whole is a speed reduction mechanism. (Other modified examples)

[0074] Furthermore, the reduction gear 50 in the above description comprises three planetary gear mechanisms 52, but the number of planetary gear mechanisms 52 in the electrically actuated valve 10 according to the present disclosure is not limited to this number. The number of planetary gear mechanisms 52 can be four or more, or even two.

[0075] Furthermore, each of the planetary gear mechanisms 52 of the reduction gear 50 comprises three planet gears 56, but the number of planet gears 56 according to the present disclosure is not limited to this number. For example, in the third planetary gear mechanism 52C, the number of third planet gears 56C can be four or more. That is, the pressure exerted on the third sun gear 54C can be reduced by increasing the number of planet gears compared to the first planetary gear mechanism 52A and the second planetary gear mechanism 52B.

[0076] Furthermore, the tooth width and module are described under gear specifications in the above description, but in the present disclosure, the specifications, which are made differently in each planetary gear mechanism 52, are not limited to these, as long as the contact area between the gears is increased. For example, the pressure of the planetary gear mechanism 52 can be reduced by using a helical gear drive in which the gear teeth are shaped helically to increase the contact area between the gears.

[0077] Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, it is clear that a person with ordinary knowledge in the field of technology to which the present disclosure belongs may conceive various modifications or applications within the scope of the technical ideas described in the claims, and it is understood that these naturally fall within the technical scope of the present disclosure.

[0078] The disclosure of Japanese patent application No. 2023-008403, filed on January 23, 2023, is incorporated in full into the present description by reference.

[0079] All documents, patent applications and technical standards mentioned in this description are incorporated into this description by reference to the same extent as if each individual document, patent application and technical standard had been expressly and individually considered to be incorporated by reference. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2006-226369

[0002] JP 2023-008403

[0078]

Claims

[1] Electrically operated valve comprising: a valve body comprising a valve chamber and a valve seat; a can which extends in an axial direction and has a cylindrical shape and is arranged on one side of the valve main body in the axial direction; a valve body located within the valve chamber; a feed spindle mechanism for advancing and retracting the valve body in the axial direction towards the valve seat; a rotor that is rotatably mounted on the inner circumference of the can; a reduction gear with several planetary gear mechanisms arranged in the axial direction, wherein the torque is transmitted successively from the side that is far from the feed spindle mechanism in the several planetary gear mechanisms to the side that is near the feed spindle mechanism, and the torque is transmitted to the feed spindle mechanism by reducing the rotational speed of the rotor; and a reducing means that reduces the pressure acting on a gear of a planetary gear mechanism located on the side closest to the feed spindle mechanism. [2] Electrically actuated valve according to claim 1, wherein the reducing means is designed such that a planetary gear mechanism located on the side furthest from the feed spindle mechanism among the multiple planetary gear mechanisms, and a planetary gear mechanism located on the side closest to the feed spindle mechanism, have different gear specifications. [3] Electrically operated valve according to claim 2, which has several planetary gear mechanisms in which torque is transferred to the sun gear and torque is delivered by the planet carrier, and in the case of planetary gear mechanisms adjacent in the axial direction, a planetary gear mechanism located on the side closer to the feed spindle mechanism has a larger tooth width of the sun gear and the planet gear than another planetary gear mechanism located on the side further away from the feed spindle mechanism. [4] Electrically actuated valve according to claim 2, wherein the planetary gear mechanism located on the side closest to the feed spindle mechanism has a larger tooth width of the sun gear and the planet gear than that of the other planetary gear mechanism located on the side furthest from the feed spindle mechanism. [5] Electrically operated valve according to claim 2, which has several planetary gear mechanisms in which torque is transferred to the sun gear and torque is delivered by the planet carrier, and in the case of planetary gear mechanisms adjacent in the axial direction, a planetary gear mechanism located on the side closer to the feed spindle mechanism has a larger module than another planetary gear mechanism located on the side further away from the feed spindle mechanism. [6] Electrically operated valve according to claim 2, wherein the planetary gear mechanism located on the side closest to the feed spindle mechanism has a larger module than that of the other planetary gear mechanism located on the side furthest from the feed spindle mechanism. [7] Electrically actuated valve according to claim 1, wherein the reducing means is designed such that in the planetary gear mechanism located on the side closest to the feed spindle mechanism, a planet carrier transmits torque and the sun gear delivers torque. [8] Electrically actuated valve according to any one of claims 1 to 7, which has a stator arranged on the outer circumference of the can and drives the rotor in a rotating manner.

Images