CN220378819U

CN220378819U - Overload gear, door opening and closing actuator and household appliance

Info

Publication number: CN220378819U
Application number: CN202322078528.8U
Authority: CN
Inventors: 任富佳; 张永松; 贺晓帆; 马涛; 姚春晓
Original assignee: Hangzhou Robam Appliances Co Ltd
Current assignee: Hangzhou Robam Appliances Co Ltd
Priority date: 2023-08-03
Filing date: 2023-08-03
Publication date: 2024-01-23
Anticipated expiration: 2033-08-03

Abstract

The utility model belongs to the technical field of electric appliances, and particularly discloses an overload prevention gear, a door opening and closing actuator and a household appliance. The overload prevention gear comprises two sub gears and an elastic pressing component, wherein one opposite surfaces of the two sub gears are provided with grooves, a containing cavity is formed by surrounding the two grooves, one end of the elastic pressing component is connected with the first sub gear, the other end of the elastic pressing component is abutted with the second sub gear, and the elastic pressing component is used for enabling the overload prevention gear to switch between a linkage state of linkage rotation of the two sub gears and a separation state of relative rotation of the two sub gears. The overload gear, the door opening and closing actuator and the household appliance disclosed by the utility model can improve the structural compactness and the use reliability of the door opening and closing actuator, thereby improving the use experience of the household appliance.

Description

Overload gear, door opening and closing actuator and household appliance

Technical Field

The utility model relates to the technical field of electric appliances, in particular to an overload prevention gear, a door opening and closing actuator and a household appliance.

Background

The dish washer is an electric appliance capable of automatically cleaning and drying tableware such as bowls and dishes, and can effectively liberate hands of a user, reduce labor intensity of the user and improve life quality.

The existing part dish washer is provided with a door opening and closing device at the top end of the machine door for improving drying efficiency, and the door opening and closing device can jack the machine door to a preset angle in the drying process, so that a gap is formed between the machine door and the machine body, steam in the liner can be discharged outwards through the gap at the upper end, and the drying process is accelerated. When the drying process is finished, the door opening and closing device pulls the door back to the closed state.

Because the push rod of the door opening and closing device pushes or pulls back the machine door adopts motor drive, when the machine door is in a pushed open state and the motor is powered off, the push rod is in an extending state, so that the push rod can obstruct the closing of the machine door, and the machine door can not be normally closed, thereby influencing the normal use of the dish washing machine.

Disclosure of Invention

The utility model aims to provide an overload prevention gear, a door opening and closing actuator and a household appliance, so that a machine door can be closed when the door opening and closing actuator is powered off, and the use flexibility and reliability of the door opening and closing actuator and the household appliance are improved.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides an overload protection gear, includes two pinion and elasticity press the subassembly, two the pinion is first pinion and second pinion respectively, two the pinion is in the axial side by side and fixed the setting, two the opposite one side of pinion is all set up flutedly, two the recess is formed with the chamber of holding around, elasticity press the subassembly install in hold the chamber and follow the radial extension of pinion, elasticity press the one end of subassembly with first pinion connection, elasticity press the other end of subassembly with second pinion butt, elasticity press the subassembly be used for making overload protection gear is two the linkage state of pinion linkage pivoted and two the separation state of pinion relative rotation is switched between.

As an alternative technical scheme of overload prevention gear, the recess cell wall of second pinion is formed with annular pressure cell wall, elasticity support the other end of pressing the subassembly with support the pressure cell wall butt, just elasticity support the pressure subassembly and be in compression state all the time in order to apply the pressure to support the pressure cell wall, so that two the pinion can be when arbitrary the torque that the pinion received is less than the moment of torsion of predetermineeing, and two the pinion is when arbitrary the moment of torsion that the pinion received is greater than or equal to the moment of torsion is predetermineeing relatively rotated.

As an optional technical scheme of the overload prevention gear, the cross section of the pressing groove wall is of a polygonal structure, and the vertex angle of the polygonal structure is an obtuse angle.

As an alternative technical scheme of the overload prevention gear, the groove wall of the groove of the second sub-gear is provided with an annular pressing groove wall, the inner end of the elastic pressing component is connected with the first sub-gear, and the outer end of the elastic pressing component is in butt joint with the pressing groove wall.

As an alternative technical scheme of the overload prevention gear, the first sub gear comprises a gear body, a main groove is formed in one face of the gear body, facing the second sub gear, and a plurality of pairs of rib parts are arranged at intervals along the circumferential direction of the gear body at the bottom of the main groove; each pair of rib parts comprises two rib parts which are opposite and are arranged at intervals, and the grooves are formed between the two rib parts.

As an alternative technical scheme of the overload prevention gear, the rib parts outwards extend along the direction far away from the grooves and are arranged at intervals with the groove walls of the grooves of the second sub-gears.

As an alternative technical scheme of the overload prevention gear, one of the two sub gears is provided with a clamping hook part, the other is provided with a central hole, the clamping hook part penetrates through the central hole and is abutted with the end face of the sub gear, and a plurality of clamping hook parts are arranged around the central hole at intervals.

As an alternative technical scheme of the overload prevention gear, the sub gear provided with the clamping hook part is provided with a positioning part, a plurality of positioning parts are arranged around the central hole at intervals, and the positioning parts extend into the central hole and are abutted with the hole wall of the central hole.

As an alternative technical scheme of overload prevention gear, elasticity supports and presses the subassembly and includes elastic component and pressure piece, the elastic component is followed the radial extension of pinion, the one end of elastic component with first pinion is connected, the elastic component other end with pressure piece is connected, pressure piece with second pinion butt.

The utility model provides a switch door executor, includes actuating mechanism and push rod, the actuating mechanism drive the push rod is along predetermineeing the direction and removing, still includes overload prevention gear as described above, actuating mechanism includes driving motor and gear train, the gear train includes a plurality of transmission gears that mesh in proper order, the cover is equipped with the worm on driving motor's the output shaft, one side of push rod is provided with rack portion, the gear train meshing in the worm with between the rack portion, one transmission gear is overload prevention gear.

As an alternative to the door opening and closing actuator, one of the sub-gears is engaged with the rack portion.

As an alternative technical scheme of the door opening and closing actuator, at least one of the transmission gears is a double gear, the double gear comprises a large gear and a small gear which are coaxial, the large gear is meshed with a worm or the transmission gear adjacent to the upper stage, and the small gear is meshed with a rack part or the transmission gear adjacent to the lower stage.

As an alternative solution of the door opening and closing actuator, the front end of the push rod is provided with a locking tongue part matched with the door lock, and the push rod extends downwards from back to front in an inclined manner.

As an alternative technical scheme of the door opening and closing actuator, the door opening and closing actuator further comprises a mounting box with a mounting cavity, the driving mechanism is mounted in the mounting cavity, and the push rod is slidably mounted in the accommodating cavity, and the front end of the push rod extends out of the mounting cavity.

As an optional technical scheme of the door opening and closing actuator, one side of the push rod is convexly provided with a guide protrusion, the cavity wall of the installation cavity is provided with a guide chute, the guide chute extends from back to front, and the guide protrusion is slidably arranged in the guide chute.

As an alternative technical scheme of the door opening and closing actuator, the door opening and closing actuator further comprises a position detection assembly, wherein the front and rear parts of the position detection assembly are provided with two position detection assemblies side by side;

the push rod is provided with a detection protrusion, the detection protrusion can promote one position detection assembly to change signals when the push rod slides to a preset door opening detection position, and the detection protrusion can promote the other position detection assembly to change signals when the push rod slides to a preset door closing position.

The utility model provides a household appliance, includes organism and gate, the lower extreme of gate with the organism articulates, includes switch door executor as above, switch door executor install in the top of organism, the push rod can stretch forward in order to jack-up the gate.

As an alternative technical scheme of the household appliance, the front end of the push rod is provided with a lock tongue, the top end of the machine door is provided with a door lock, and the lock tongue can be locked with or separated from the door lock.

As an alternative technical solution of the household appliance, the driving mechanism can drive the push rod to extend forwards to jack the door by a preset angle or drive the push rod to retract backwards to pull the door back to a closed state when the locking tongue portion is locked with the door lock.

The utility model has the beneficial effects that:

the overload prevention gear provided by the utility model can realize the forced retraction of the push rod after the power-off of the driving motor, ensure that the door can be normally closed, and improve the use convenience and the use reliability of the door opening and closing actuator and the dish washing machine; meanwhile, as the two sub gears are arranged side by side in the axial direction, the elastic pressing component is arranged between the two sub gears, so that the size of the two sub gears in the axial direction can be effectively reduced, the structural compactness of the overload prevention gear is improved, and the structural compactness of the door opening and closing actuator is improved; furthermore, the elastic pressing component is arranged between the two sub gears, so that the exposure of the elastic pressing component can be reduced, and the probability that an external structure acts on the elastic pressing component is reduced, so that the use reliability of the elastic pressing component is ensured.

The door opening actuator provided by the utility model can improve the structural compactness and the operation reliability of the door opening actuator by adopting the overload prevention gear.

The household appliance provided by the utility model can improve the use reliability and the use experience of the household appliance by adopting the door opening and closing actuator.

Drawings

Fig. 1 is a schematic view of a portion of a home appliance provided by an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

FIG. 3 is a schematic structural view of a door opening and closing device and a door according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a door opening and closing actuator according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of a split structure of a door opening and closing actuator according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a driving mechanism according to an embodiment of the present utility model;

fig. 7 is a schematic structural diagram of an overload prevention gear and a push rod according to an embodiment of the present utility model;

fig. 8 is a schematic structural view of an overload prevention gear according to an embodiment of the present utility model;

FIG. 9 is a schematic view of a first sub-gear and resilient pressing assembly according to an embodiment of the present utility model;

FIG. 10 is a schematic diagram of a second sub-gear according to an embodiment of the present utility model;

FIG. 11 is a schematic view of a push rod according to an embodiment of the present utility model;

FIG. 12 is a schematic diagram of a position detecting assembly according to an embodiment of the present utility model;

fig. 13 is a schematic view of a matching structure of a detection protrusion and an abutment portion when a push rod provided in an embodiment of the present utility model is at a closed detection position;

fig. 14 is a schematic diagram of a matching structure of a detection protrusion and an abutment portion when a push rod provided in an embodiment of the present utility model is at a door-open detection position.

The figures are labeled as follows:

100. a door opening and closing actuator; 200. a door lock; 300. an inner container; 301. a liner top plate; 400. a front frame; 401. an upper cross beam; 4011. front perforation; 500. a gate;

1. a mounting box; 11. an upper cover; 111. a first clamping part; 12. a lower cover; 121. a second clamping part;

2. a push rod; 21. a main rod body; 22. a latch portion; 23. a rack portion; 24. a guide protrusion; 25. detecting the bulge; 25a, door opening detection protrusions; 25b, door closing detection protrusions; 26. a detection groove;

3. a driving mechanism; 31. a driving motor; 32. an overload prevention gear; 321. a first sub-gear; 3211. a gear body; 32111. a main groove; 3212. a hook part; 32121. a connection arm portion; 32122. a limit hook part; 3213. rib parts; 32131. a support rib portion; 32132. a positioning part; 3214. a reinforcing rib portion; 3215. a first groove; 3216. reinforcing the convex portion; 3217. a central boss; 3218. a shaft mounting hole; 322. a second sub-gear; 3221. a second groove; 32211. pressing the groove wall; 3222. a central bore; 323. an elastic pressing component; 3231. an elastic member; 3232. a pressing member; 33. a worm; 34. a first transmission gear; 35. a second transmission gear; 36. a third transmission gear;

4. A position detection assembly; 4a, a door opening position detection assembly; 4b, a door closing position detection assembly; 41. an induction member; 42. a trigger; 421. a main body plate portion; 422. an abutting portion; 422a, a door opening abutment; 422b, a door closing abutment; 423. a trigger part; 424. a hinge part; 43. a reset member; 5. a control board; 51. and an avoidance port.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 to 3, the present utility model provides a home appliance including a door 500, a body, and a door opening and closing device. The door 500 has a cavity with an opening at a front side, and a lower end of the door 500 is rotatably connected with the door 500 to open or close the cavity; the door opening and closing device comprises a door lock 200 arranged at the upper end of the machine door 500 and a door opening and closing actuator 100 arranged at the upper end of the machine body, wherein the door lock 200 is matched with the door opening and closing actuator 100 to realize automatic opening or closing of the machine door 500. Wherein the household appliances can be, but are not limited to, dishwashers, steaming ovens, sterilizing cabinets, etc.

In this embodiment, a household appliance is taken as an example of a dishwasher, and the structure of the door opening and closing actuator 100 is described, that is, the cavity forms a washing cavity of the dishwasher. The application of the door opening and closing actuator 100 to other types of home appliances may be referred to as its application to a dishwasher.

As shown in fig. 4 and 5, the door opening and closing actuator 100 has a driving mechanism 3 and a push rod 2, and a latch bolt 22 is provided at the front end of the push rod 2, and the door opening and closing device has a locked state in which the latch bolt 22 is locked with the door lock 200 and an unlocked state in which the latch bolt 22 is disengaged from the door lock 200; the driving mechanism 3 can drive the push rod 2 to extend forward when the bolt portion 22 is locked with the door lock 200, so as to jack the door 500 by a preset angle, or drive the push rod 2 to retract backward, so as to pull the door 500 back to the closed door. Therefore, the automatic opening of the machine door 500 by a preset angle in the drying stage of the dish washer can be realized, so that the steam dissipation requirement in the drying stage is met, and meanwhile, the machine door 500 can be automatically closed after the machine door 500 is opened by the preset angle, and the automation degree of the dish washer is improved.

It should be noted that, in the above and the following description, the directions of left and right, front and back, vertical direction and the like are all directions, and when the household appliance is in a normal use state, the direction of the household appliance relative to the user is external, that is, the front end of a certain structure is one end close to the user, and the rear end is one end far away from the user.

The body includes a cabinet, a base, a front frame 400, and a liner 300. Wherein, the base forms the bottom of the machine body; the inner container 300 is arranged at the upper end of the base, and a cavity with an opening at the front side is formed inside the inner container 300; the front frame 400 is connected to the front side of the inner container 300 and to the lower end of the base; the casing is wrapped outside the base, the inner container 300 and the front frame 400. Specifically, the casing includes two side plates opposite in the left-right direction and arranged at intervals, a casing top plate connected between the top ends of the two side plates, and a back plate connected to the casing top plate and the back sides of the two side plates, and the liner 300 and the front frame 400 are located in a space formed by the casing.

In this embodiment, the top surface of the inner container 300 is spaced from the top plate, and an installation space is formed by the top plate of the inner container 300, the top plate of the housing, and the upper beam 401 of the front frame 400, and the door opening/closing actuator 100 is installed in the installation space. The upper beam 401 is provided with a front perforation 4011 for the push rod 2 to pass through, facing the locking tongue 22.

In this embodiment, the latch portion 22 is always located outside the machine body, i.e., the locking and unlocking of the latch portion 22 and the door lock 200 is performed by manually or otherwise pushing the door 500 to open or close. In other embodiments, the latch portion 22 may be disengaged from the door lock 200 when the driving mechanism 3 drives the push rod 2 to retract back to the inner side of the upper beam 401, and the latch portion 22 may be inserted into the door lock 200 to be locked by the push rod 2 extending forward to the outer side of the body when the driving mechanism 3 is in the door-closed state.

The structures of the machine body, the machine door 500 and the door lock 200, and the matching structure of the bolt portion 22 and the door lock 200 can be set with reference to the prior art, which is not the focus of the present utility model and will not be repeated here.

As shown in fig. 4 and 5, in order to improve the convenience of assembling and disassembling the door opening and closing actuator 100, the door opening and closing actuator 100 further includes an installation chamber installation box 1, the installation box 1 is detachably connected with the machine body, the driving mechanism 3 is installed in the installation chamber, and the push rod 2 is slidably installed in the installation chamber. The front side of the installation cavity is provided with a rod perforation, and the push rod 2 is slidably arranged in the rod perforation in a penetrating way so that the push rod 2 extends out of the installation cavity forwards. This enables the door opening/closing actuator 100 to be integrally attached to and detached from the machine body.

The mounting box 1 comprises a lower cover 12 and an upper cover 11 which are connected in an up-down buckling manner, and a mounting cavity is formed by surrounding the upper cover 11 and the lower cover 12, so that the convenience in dismounting of parts in the mounting box 1 is improved. The lower cover 12 is provided with an upward-opening mounting groove, the driving mechanism 3 and the push rod 2 are arranged in the mounting groove, the upper cover 11 is buckled and connected with the upper end opening of the mounting groove, and the upper cover 11 and the bottom of the mounting groove are surrounded to form the mounting cavity. This kind of setting for actuating mechanism 3 and push rod 2 all install in lower cover 12 departments, when carrying out dismouting and maintenance to the structure in the installation box 1, lift down upper cover 11 from lower cover 12, can satisfy the maintenance and the dismouting of installation box 1 inner structure, need not to lift down installation box 1 whole from the organism, improve the equipment and the maintenance convenience of switch door executor 100.

In order to improve the convenience of assembling and disassembling the upper cover 11 and the lower cover 12, a plurality of first clamping parts 111 are arranged at intervals on the periphery side of the upper cover 11, second clamping parts 121 are arranged on the lower cover 12, the second clamping parts 121 are arranged in one-to-one correspondence with the first clamping parts 111, and the first clamping parts 111 are clamped with the second clamping parts 121. Further, the upper cover 11 and the lower cover 12 are also connected by threaded fasteners. Namely, the upper cover 11 and the lower cover 12 are connected by adopting a clamping and threaded fastener connection mode, so that the number of required threaded fasteners is reduced while the connection stability of the upper cover 11 and the lower cover 12 is ensured, and the disassembly efficiency of the upper cover 11 and the lower cover 12 is improved.

Since the door 500 is turned over downward during the opening process, the position of the door lock 200 is gradually moved downward during the opening process of the door 500. In order to avoid the problem that the push rod 2 is bent or the latch portion 22 is not matched with the door lock 200 in place due to the change of the height position of the door lock 200 during the opening or closing process of the door 500, in this embodiment, the push rod 2 extends obliquely downward from back to front, and a preset included angle is formed between the push rod 2 and the horizontal plane. This kind of setting for push rod 2 is upwards stretching out the in-process, and the position of lock tongue 22 descends gradually, makes the high position phase-match of lock tongue portion 22 and lock 200's high position, guarantees that door lock 200 and lock tongue portion 22 can be in the locking state all the time steadily at the in-process of opening machine door 500 a section distance, guarantees the reliability of use of door actuator 100 and door lock 200, reduces the probability that push rod 2 and door lock 200 card are dead or break away from.

The preset included angle is preferably smaller than 10 °, but it is understood that the preset included angle should be specifically set according to the movement track of the door lock 200 during the opening or closing process of the door 500, that is, when the preset angle is opened, if the door lock 200 is lowered to a greater height relative to the door 500, the preset included angle is relatively greater.

Further, the push rod 2 comprises a main rod body 21, the front end of the main rod body 21 is connected with the lock tongue portion 22, and the thickness of the main rod body 21 is larger than that of the lock tongue portion 22, so that the thickness of the lock tongue portion 22 can be reduced to ensure that the lock tongue portion 22 can be matched with the door lock 200 better, the overall structural strength and rigidity of the push rod 2 are ensured, the push rod 2 is prevented from being broken, and the setting of the rack portion 23 is facilitated. The main rod body 21 is preferably rectangular in cross section to better fit the rod chute. The main rod body 21 and the bolt portion 22 are preferably connected in a smooth transition manner by a transition portion so as to avoid local stress concentration caused by abrupt change of the section.

To further improve the reliability of the extension or retraction of the push rod 2. One side of the push rod 2 is convexly provided with a guide bulge 24, the cavity wall of the installation cavity is provided with a guide chute, the guide chute extends along the preset direction, and the guide bulge 24 is arranged in the guide chute in a sliding way. The sliding fit arrangement of the guide chute and the guide protrusion 24 is beneficial to better guiding the movement of the push rod 2 and ensuring the operation precision of the push rod 2, thereby improving the reliability of the fit with the door lock 200; meanwhile, the area of the guide bulge 24 matched with the guide chute is smaller than the matching area of the push rod 2 and the rod chute, so that the matching precision of the guide chute and the guide bulge 24 can be controlled in a finishing mode, the movement precision of the push rod 2 is better ensured, and the cost is reduced.

The guide projection 24 is preferably rectangular in cross section to better fit the guide runner. The ratio of the width of the guide projection 24 in the left-right direction to the width of the main lever body 21 in the left-right direction is preferably 0.3 to 0.7.

In this embodiment, the upper end surface of the main rod body 21 is convexly provided with a guide protrusion 24, and the inner side surface of the upper cover 11 is provided with a guide chute. In other embodiments, the end surface of the main rod body 21 may be provided with a guide protrusion 24, and the lower cover 12 is provided with a guide chute. Preferably, a window is formed at the rear side of the upper end of the upper cover 11, and penetrates through the top surface of the guide chute, and when the door 500 is closed, the guide protrusion 24 is exposed through the window, so that the position of the guide protrusion 24 can be conveniently checked during maintenance.

As shown in fig. 6 and 7, the driving mechanism 3 includes a driving motor 31 and a transmission assembly. Wherein, the driving motor 31 is installed on the lower cover 12, the transmission assembly comprises a worm 33 and a gear set, and the worm 33 is coaxially installed on the output shaft of the driving motor 31; the push rod 2 extends along a preset direction, and one side of a main rod body 21 of the push rod 2 is provided with a rack part 23; the gear set includes a plurality of transmission gears, and the gear set is engaged between the worm 33 and the rack portion 23. When the driving motor 31 rotates, the worm 33 is driven to rotate, so that the push rod 2 is driven to move along a preset direction through the rotation of gears in the gear set, namely, the push rod 2 is driven to extend forwards or retract backwards; meanwhile, the transmission between the driving motor 31 and the push rod 2 is realized through the gear set, the transmission ratio can be controlled according to the number of transmission gears in the gear set and the gear ratio between the transmission gears, the design flexibility is improved, and the occupied space is reduced.

In order to realize the installation and positioning of the driving mechanism 3 and the push rod 2 on the lower cover 12, a plurality of positioning convex ribs are convexly arranged at the bottom of the installation groove, a plurality of positioning convex ribs and the groove walls of the installation groove are surrounded to form a rod chute, a motor groove and a plurality of gear grooves, and the rod chute extends from back to front and is at least penetrated at the front end. The gear grooves are arranged in one-to-one correspondence with at least part of the gears, and the gears are installed in the corresponding gear grooves through the installation shafts in a rotating manner, and the driving motor 31 is installed in the motor grooves. The arrangement is beneficial to realizing the installation and positioning of each part of the installation groove and improving the installation reliability of the driving mechanism 3.

In order to avoid the problem that the push rod 2 cannot retract due to the power failure of the driving motor 31 after the push rod 2 extends out, and further the closing of the door 500 is affected, in this embodiment, one of the transmission gears in the gear set is the overload prevention gear 32.

Specifically, as shown in fig. 7 to 10, the overload prevention gear 32 includes two sub-gears and an elastic pressing component 323, the two sub-gears are a first sub-gear 321 and a second sub-gear 322, the two sub-gears are arranged side by side and fixedly in the axial direction, opposite faces of the two sub-gears are provided with grooves, two grooves surround to form a containing cavity, the elastic pressing component 323 is installed in the containing cavity and extends along the radial direction of the sub-gears, one end of the elastic pressing component 323 is connected with the first sub-gear 321, the other end of the elastic pressing component 323 is abutted with the second sub-gear 322, and the elastic pressing component is used for enabling the overload prevention gear to switch between a linkage state of linkage rotation of the two sub-gears and a separation state of relative rotation of the two sub-gears.

According to the overload prevention gear 32 provided by the embodiment, the elastic pressing component 323 is arranged, one end of the elastic pressing component 323 is connected with the first sub-gear 321, and the other end of the elastic pressing component applies pressing force to the second sub-gear 322, so that the overload prevention gear 32 has a linkage state in which two sub-gears synchronously rotate and a rotation separation state in which the two sub-gears can relatively rotate. Namely, the overload prevention gear 32 provided in the embodiment can realize the forced retraction of the push rod 2 after the power-off of the driving motor 31, ensure that the door 500 can be normally closed, and improve the use convenience and the use reliability of the door opening and closing actuator 100 and the dish washer; meanwhile, as the two sub gears are arranged side by side in the axial direction, the elastic pressing component 323 is arranged between the two sub gears, so that the size of the two sub gears in the axial direction can be effectively reduced, the structural compactness of the overload prevention gear 32 is improved, and the structural compactness of the door opening and closing actuator 100 is improved; furthermore, the elastic pressing component 323 is arranged between the two sub gears, so that the exposure of the elastic pressing component 323 can be reduced, the probability that an external structure acts on the elastic pressing component 323 is reduced, and the use reliability of the elastic pressing component 323 is ensured.

The groove walls of the second sub-gear 322 form an annular pressing groove wall 32211, the other end of the elastic pressing component 323 is in pressing contact with the pressing groove wall 32211, and the elastic pressing component 323 is always in a compressed state to apply pressing force to the pressing groove wall 32211, so that the two sub-gears can keep synchronously rotating when the torque received by any sub-gear is smaller than the preset torque, and the two sub-gears relatively rotate when the torque received by any sub-gear is larger than or equal to the preset torque.

That is, by setting the magnitude of the preset torque, the torque transmitted to the overload prevention gear 32 is smaller than the preset torque when the driving motor 31 is in normal operation, so that the synchronous linkage rotation of the two sub gears is ensured when the driving motor 31 is in normal operation, the smooth transmission of the torque is ensured, and the normal driving of the push rod 2 by the driving mechanism 3 is ensured; when the driving motor 31 is powered off, the door 500 is pushed manually by force, so that a pushing force is manually applied to the push rod 2, so that the push rod 2 applies a torque larger than a preset torque to the overload prevention gear 32 through the engagement of the rack part 23 and the transmission gear, and the two sub gears can rotate relatively, so that the push rod 2 can retract back to an initial state, and the push rod 2 is prevented from being in an extending state to influence the closing of the door 500; meanwhile, when the push rod 2 is forcedly retracted backwards, as the sub gear close to the push rod 2 in the two sub gears rotates and the other sub gear can be kept fixed, the torque generated by forcedly closing the door can be effectively prevented from being transmitted to the driving motor 31, and the driving motor 31 is prevented from being damaged.

For convenience of description, the groove provided on the first sub gear 321 is referred to as a first groove 3215, and the groove provided on the second sub gear 322 is referred to as a second groove 3221.

In the present embodiment, the inner end of the elastic pressing component 323 is connected to the first sub-gear 321, and the outer end of the elastic pressing component 323 abuts against the pressing groove wall 32211. This kind of setting is favorable to elasticity to support and presses the arrangement of subassembly 323 on first pinion 321, is favorable to increasing elasticity and supports the length that presses subassembly 323 to allow the setting, improves elasticity and supports the design flexibility of pressing subassembly 323, and improves the cooperation convenience of two pinions. That is, in the present embodiment, the outer groove wall of the second groove 3221 forms the pressing groove wall 32211.

In other embodiments, the outer end of the elastic pressing component 323 may be connected to the first sub gear 321, and the inner end may abut against the pressing groove wall 32211. In this arrangement, the second groove 3221 is an annular groove, and the inner groove wall of the annular groove forms a pressing groove.

Preferably, the pressing groove wall 32211 has a polygonal structure, that is, the pressing groove wall 32211 includes a plurality of groove side walls connected end to end in sequence, and an included angle between two adjacent groove side walls is greater than 120 °. Further, when the elastic pressing component 323 is pressed against the intersection of the two adjacent groove side walls, the torque required by the two sub-gears to realize the relative rotation is the preset torque. This kind of setting, because be the contained angle setting between two groove lateral walls, when the terminal of elasticity pressure subassembly 323 slides to the surface of groove lateral wall from the intersection of two groove lateral walls, the interval between the both ends of elasticity pressure subassembly 323 reduces, elasticity pressure subassembly 323 increases to the pressure cell wall 32211 applied pressure, thereby the friction increase between the pressure end of elasticity pressure subassembly 323 and the second pinion 322, need overcome this friction and drive second pinion 322 relative first pinion 321 pivoted moment of torsion increase, thereby can guarantee can not rotate at will between two pinions, and only can drive two pinions and rotate each other when pushing push rod 2 with effort, guarantee that two pinions can keep to the linkage state more steadily, improve overload prevention gear 32's reliability of use.

Preferably, the first grooves 3215 are disposed in one-to-one correspondence with the elastic pressing assemblies 323, so as to further facilitate the installation and positioning of the elastic pressing assemblies 323. In the present embodiment, the elastic pressing assemblies 323 are provided with four in the circumferential direction of the first sub-gear 321 at uniform intervals, and the first grooves 3215 are provided with four. In other embodiments, the number of resilient pressing members 323 may be three, five or more.

In order to facilitate the opening of the first groove 3215, the first sub-gear 321 comprises a gear body 3211, a main groove 32111 is formed in one surface of the gear body 3211 facing the second sub-gear 322, and a plurality of pairs of rib parts 3213 are formed at intervals along the circumferential direction of the gear body 3211 at the bottom of the main groove 32111; each pair of rib portions 3213 includes two rib portions 3213 disposed opposite to each other at an interval, and a first groove 3215 is formed between the two rib portions 3213. The arrangement mode of the first groove 3215 can reduce the overall weight of the first sub-gear 321 and ensure the overall structural strength of the first sub-gear 321 while facilitating the forming of the first groove 3215.

Preferably, the elastic pressing component 323 includes an elastic member 3231 and a pressing member 3232, the elastic member 3231 extends along a radial direction of the first sub-gear 321 and has an inner end connected to the first sub-gear 321, a second end of the elastic member 3231 is connected to or abuts against the pressing member 3232, and the pressing member 3232 abuts against the pressing groove wall 32211, so that a larger elastic force can be provided to the pressing member 3232 by the elastic member 3231, the probability of unreliable pressing caused by deformation and damage of the pressing member 3232 is reduced, and the elastic force applied to the second sub-gear 322 by the elastic pressing component 323 can be adjusted to be more convenient when the linkage state is reasonably selected according to the selection of the elastic member 3231, so that the elastic force is adjusted, the processing cost of the overload prevention gear 32 is reduced, and the reliability of use is improved. Furthermore, since the elastic member 3231 and the pressing member 3232 are separately disposed, the material of the pressing member 3232 can be better selected, and the matching performance between the pressing member 3232 and the second sub-gear 322 can be improved.

In the present embodiment, the first sub-gear 321, the second sub-gear 322 and the pressing member 3232 are all made of plastic, so as to reduce cost and weight. The material of the pressing member 3232 may be the same as or different from that of the second sub-gear 322.

To facilitate the installation of the elastic member 3231, the inner end groove wall of the first groove 3215 is formed with an abutment plane perpendicular to the extending direction of the elastic member 3231, thereby facilitating the abutment of the inner end of the elastic member 3231 on the plane. Preferably, the abutment plane is convexly provided with a guide post, and the inner end of the elastic member 3231 is sleeved on the elastic member 3231, so that the elastic member 3231 is favorably installed and positioned in the first groove 3215, and the elastic member 3231 is prevented from deflecting in the deformation process.

The pressing member 3232 includes a connecting portion connected to the outer end of the elastic member 3231, and a pressing portion abutting the pressing groove wall 32211. The outer side surface of the pressing portion is preferably an arc surface, so that the contact between the pressing portion and the pressing groove wall 32211 is a line contact, and the probability that the pressing portion and the pressing groove wall 32211 are worn out when the first sub-gear 321 and the second sub-gear 322 relatively rotate is reduced.

The connecting portion is preferably in a columnar structure, and the second end of the elastic member 3231 is sleeved on the connecting portion and abuts against the pressing portion, so that the pressing member 3232 and the elastic member 3231 can be prevented from being connected by welding or other modes, the assembling and disassembling probability of the pressing member 3232 and the elastic member 3231 is improved, and the convenience in replacing the pressing member 3232 and the elastic member 3231 is improved.

In order to fix the two sub-gears in the axial direction, one of the two sub-gears is provided with a clamping hook portion 3212, the other one is provided with a central hole 3222, the clamping hook portion 3212 penetrates through the central hole 3222 and abuts against the end face of the sub-gear, and the clamping hook portions 3212 are arranged at intervals around the central hole 3222. The clamping hook portion 3212 is arranged, so that the sub-gear provided with the central hole 3222 can be positioned between the end face of the other sub-gear and the clamping hook portion 3212 at the upper limit in the axial direction, the two sub-gears are ensured to be relatively fixed in the axial direction, and the whole overload prevention gear 32 can be assembled and then connected with other structures, so that the whole disassembly and assembly of the overload prevention gear 32 are realized; meanwhile, the arrangement of the clamping hook portion 3212 does not influence the relative rotation between the two sub gears, and the use reliability of the overload prevention gear 32 is ensured.

The hook portion 3212 has a connecting arm portion 32121 and a limiting hook portion 32122 that are vertically connected, the connecting arm portion 32121 is arranged in the central hole 3222 in a penetrating manner, the limiting hook portion 32122 abuts against the end face of the sub-gear, which is away from the other sub-gear, and the opposite end faces of the two sub-gears are attached. In the present embodiment, the hook portion 3212 is disposed on the first sub-gear 321, so as to simplify the processing flow of the second sub-gear 322 and reduce the processing cost of the second sub-gear 322; meanwhile, the arrangement ensures that the first sub-gear 321 does not need to be provided with the central hole 3222 with larger area, and the installation space of the elastic pressing component 323 can be better ensured.

In the present embodiment, the hook portions 3212 and the elastic pressing assemblies 323 are staggered in the circumferential direction of the first sub-gear 321, that is, the hook portions 3212 are disposed between the two elastic pressing assemblies 323, so that the axial size requirements of the elastic pressing assemblies 323 and the hook portions 3212 in the axial direction can be reduced while the axial size requirements of the first sub-gear 321 are ensured, and the overall structural compactness of the overload protection gear 32 is improved.

The hook portion 3212 is preferably formed by punching the gear body 3211, so as to simplify the processing of the first sub-gear 321, and the position of the gear body 3211 corresponding to the hook portion 3212 is a through hole, thereby reducing the overall weight of the first sub-gear 321. One end of the limiting hook portion 32122, which is far away from the connecting arm portion 32121, is provided with a guiding inclined surface, and the guiding inclined surface extends in a direction away from the connecting arm portion 32121 toward the gear body 3211, so that the hook portion 3212 can be inserted into the central hole 3222 to guide, and smoothness of assembling the two sub gears is improved.

Further, the end face of the gear body 3211 is convexly provided with a positioning portion 32132, the positioning portion 32132 is provided with a plurality of positioning portions along the circumferential direction of the central hole 3222 at intervals, and the positioning portion 32132 is abutted against the hole wall of the central hole 3222, so that coaxiality of two sub-gear assembly shafts can be better ensured, and use reliability of the overload prevention gear 32 is ensured. Preferably, each hook portion 3212 is located between two adjacent positioning portions 32132.

The center of the gear body 3211 is provided with a center boss 3217, and a plurality of pairs of rib portions 3213 are provided around the center boss 3217. In this embodiment, the central boss 3217 has a hexahedral structure, each pair of rib portions 3213 is connected to each side of the central boss 3217, and an inner end of the rib portion 3213 is vertically connected to the central boss 3217, thereby improving the convenience of processing and molding of the first sub-gear 321.

The rib portion 3213 has a positioning rib portion and a supporting rib portion 32131, the positioning rib portion is connected between the supporting rib portion 32131 and the central boss 3217, the height of the positioning rib portion from the main groove 32111 is larger than the height of the supporting rib portion 32131 from the main groove 32111, the positioning rib portion forms a positioning portion 32132 toward one end of the supporting rib portion 32131, and the supporting rib portion 32131 forms a supporting surface toward one side of the second sub gear 322.

One side of each rib portion 3213 facing away from the first groove 3215 is connected with a reinforcing rib portion 3214 for enhancing the overall structural strength and rigidity of the first sub gear 321. The rib portion 3214 is spaced from the pressing groove wall 32211 and is preferably connected to an outer end of the rib portion 3213 to improve processing convenience.

A rib portion is connected between two rib portions 3213 adjacent to each other forming the same first groove 3215, so as to further enhance the overall structural strength of the first sub-gear 321. A reinforcing boss is connected between two adjacent rib portions 3213 of different first grooves 3215 to ensure the overall structural strength of the first sub-gear 321 while increasing the groove depth of the main groove 32111.

In the present embodiment, the overload prevention gear 32 forms an output gear of the gear set, that is, one sub-gear of the overload prevention gear 32 is meshed with the rack portion 23. In the present embodiment, it is preferable that the second sub-gear 322 is engaged with the rack portion 23, so that when the push rod 2 is manually pushed to rotate, the push rod 2 drives the second sub-gear 322 to rotate, and the first sub-gear 321 and the elastic pressing member 323 do not need to rotate, so that the load required for rotation can be reduced. In other embodiments, the first sub-gear 321 may be engaged with the rack portion 23, and the second sub-gear 322 may be engaged with the upper gear.

It should be noted that the number of teeth of the first sub-gear 321 and the second sub-gear 322 may be the same or different, and specifically, the number of teeth may be set according to the required gear ratio.

Among other drive gears of the gear set, at least one drive gear is a double gear including a large gear and a small gear coaxially, the large gear being engaged with the worm 33 or the drive gear of the adjacent upper stage, and the small gear being engaged with the rack portion 23 or the drive gear of the adjacent lower stage. Therefore, the transmission ratio of the whole gear set can be increased, the whole occupied space of the gear set can be reduced, and the cost is saved. It should be noted that, the "upper gear" is an adjacent gear close to the driving motor 31.

In this embodiment, the gear set further includes a first transmission gear 34, a second transmission gear 35, and a third transmission gear 36 that are sequentially engaged, the first transmission gear 34 is engaged with the worm 33, and the third transmission gear 36 is engaged with the first sub-gear 321. The first transmission gear 34 and the second transmission gear 35 are duplicate gears.

It should be noted that, the overload gear 32 and the door opening and closing actuator 100 may be applied to a household appliance with separate ejection structure and door lock structure, that is, the door opening and closing actuator 100 only performs the function of ejecting the door 500, that is, the push rod 2 ejects the door 500 by a preset angle when extending; when the push rod 2 is in use, only the door opening and closing actuator 100 is reset, so that the push rod 2 is prevented from influencing the door closing action. The top of the machine body is additionally provided with a lock tongue structure separated from the door opening and closing actuator 100, and the lock tongue structure is matched with the door lock 200 on the machine door 500.

As shown in fig. 11 to 14, further, to detect the movement position of the push rod 2, the door opening and closing actuator 100 further includes a position detection assembly 4 and a control board 5 mounted in the mounting cavity, the driving motor 31 and the position detection assembly 4 are electrically connected with the control board 5, the position detection assembly 4 is used for detecting whether the push rod 2 slides to a preset detection position, and the control board 5 is used for controlling the driving motor 31 to stop moving when the push rod 2 slides to the preset detection position, so as to prevent the push rod 2 from moving too far to damage the door 500 or other structures, and improve the reliability of use of the door opening and closing actuator 100.

In this embodiment, the push rod 2 has two preset detection positions, which are a door opening detection position and a door closing detection position, respectively; when the push rod 2 slides to the door opening detection position, the machine door 500 is pushed up by a preset angle; when the push rod 2 slides to the door closing detection position, the door 500 is in a closed state. The two position detecting assemblies 4 are provided, and the two position detecting assemblies 4 are a door opening position detecting assembly 4a and a door closing position detecting assembly 4b respectively. The door opening position detecting assembly 4a is used for detecting whether the push rod 2 reaches a door opening detecting position, and the door closing position detecting assembly 4b is used for detecting whether the push rod 2 reaches a door closing detecting position, so that the door 500 is opened and closed, and the use safety and reliability of the door opening and closing actuator 100 are effectively improved.

Each position detecting assembly 4 comprises a sensing piece 41 and a triggering piece 42, the position detecting assembly 4 is provided with a triggering state that the sensing piece 41 is triggered by the triggering piece 42 and a non-triggering state that the sensing piece 41 is not triggered by the triggering piece 42, and when the push rod 2 slides to a preset detecting position, the triggering piece 42 can be actuated to rotate or slide, so that the sensing piece 41 can be switched in state. The sensing member 41 is electrically connected with the control board 5, whereby the control board 5 judges whether the push rod 2 reaches a preset detection position through a signal emitted from the sensing member 41.

According to the door opening and closing actuator 100 provided by the embodiment, when the push rod 2 slides to the preset detection position, the trigger piece 42 is actuated to actuate, so that the trigger piece 42 triggers the sensing piece 41 to perform state switching, the state switching between the sensing pieces 41 is controlled by the trigger piece 42 instead of the direct control of the push rod 2, and compared with the existing detection mode that the sensor state is changed due to the fact that the convex contact sensor is directly arranged on the push rod 2, the detection mode provided by the embodiment can realize the separation of the push rod 2 and the sensing piece 41 in space, and therefore the installation position of the sensing piece 41 is not limited by the installation position of the push rod 2, and the setting flexibility of the sensing piece 41 and the push rod 2 is improved; meanwhile, the probability of abrasion of the push rod 2 can be reduced because the induction piece 41 does not need to directly act on the push rod 2, so that the problem of unreliable detection caused by the abrasion of the bulge on the push rod 2 is reduced; in this embodiment, the trigger member 42 is separated from the push rod 2, so that the structure of the trigger member 42 matched with the sensing member 41 can be set according to the actual use requirement, and the structure of the push rod 2 is not required to be considered, so that the setting flexibility and the detection reliability of the position detection assembly 4 are further improved.

In this embodiment, when the push rod 2 slides to the switch detection position, the sensing element 41 of the switch position detection assembly 4 can be driven to act, and when the push rod 2 slides to the door closing detection position, the sensing element 41 of the door closing position detection assembly 4bb can be driven to act.

The trigger piece 42 is rotatably installed in the installation cavity, the trigger piece 42 is provided with an abutting part 422 and a trigger part 423, and the trigger part 423 is matched with the sensing piece 41; the push rod 2 is provided with a detection protrusion 25, and the detection protrusion 25 can push against the abutting part 422 when the push rod 2 slides to a preset detection position, so as to actuate the trigger piece 42 to rotate, and the trigger part 423 triggers the sensing piece 41 to switch states. Through trigger 42 rotation installation to the installation intracavity, can improve trigger 42 and install the stability and the reliability of setting up in the installation intracavity, be favorable to realizing trigger 42's installation location and reset after the motion, and can control trigger 42's motion track more reliably, improve the detection reliability of position detection subassembly 4.

To further improve the structural compactness, in the present embodiment, the control board 5 is vertically disposed, and the driving motor 31 and the sensing member 41 are installed at opposite sides of the control board 5. The bottom of the control panel 5 is provided with avoiding openings 51, the avoiding openings 51 are arranged in one-to-one correspondence with the triggering pieces 42, the triggering pieces 42 are provided with triggering portions 423 which act with the sensing pieces 41, and the avoiding openings 51 are used for providing avoidance for the movement of the triggering portions 423. Thereby preventing the control board 5 from interfering with the movement of the triggering portion 423.

In order to reduce the occupied space of the trigger 42 and improve the structural compactness of the door opening and closing actuator 100, the push rod 2 is arranged above the trigger 42 in a straddling manner, the detection protrusion 25 is arranged at the lower side of the push rod 2, and the trigger portion 423 is positioned at the outer side of the push rod 2 in the left-right direction. The trigger piece 42 can be arranged approximately horizontally, so that the size of the trigger piece 42 in the height direction is reduced, and the layout rationality of the trigger piece 42 is improved; meanwhile, the triggering piece 42 is partially arranged below the push rod 2, so that the distance between the triggering part 423 and the detection protrusion 25 can be shortened, the required size of the triggering part 423 and the detection protrusion 25 is reduced, the integral structure of the triggering piece 42 is reduced, and the structural compactness is improved; the trigger portion 423 is disposed outside the push rod 2, which is also advantageous in achieving the engagement between the trigger portion 423 and the sensing piece 41.

Specifically, the bottom of the installation cavity is provided with an accommodating groove, the accommodating groove penetrates through part of the groove bottom of the rod chute, the push rod 2 is slidably mounted in the rod chute, the trigger piece 42 is rotatably mounted in the accommodating groove, and the abutting portion 422 is located at the part of the accommodating groove penetrating through the rod chute. The arrangement of the receiving recess is advantageous in providing positioning for the arrangement of the trigger 42; meanwhile, the arrangement of the accommodating groove further improves the structural compactness as the accommodating groove is better formed by utilizing the thickness of the bottom of the mounting groove, and the trigger piece 42 can be better prevented from interfering with the push rod 2.

Further, a detection groove 26 is formed on one side of the push rod 2, the detection groove 26 extends along the extending direction of the push rod 2, the abutting portion 422 extends into the detection groove 26 and can slide relatively in the detection groove 26, and a detection protrusion 25 is protruding from a groove wall of the detection groove 26. The setting of detection recess 26 is favorable to providing for triggering portion 423 and dodges, guarantees that triggering portion 423 can with detect protruding 25 butt in, avoids triggering portion 423 and the collision of pole main part, improves the reliability of use of position detection subassembly 4, and reduces the depth demand to holding the recess and further improves compactibility.

The detection groove 26 preferably penetrates through the rear side surface of the push rod 2, so that the triggering part 423 can slide out of the push rod 2 along the detection groove 26, and the triggering part 42 and the push rod 2 can be disassembled and assembled more conveniently; meanwhile, when the trigger portion 423 is not abutted to the corresponding detection protrusion 25, the trigger portion 423 can slide out of the outer side of the detection groove 26, so that the requirement for the mounting position of the trigger portion 423 can be reduced, and the requirement for the mounting position of the trigger piece 42 and the position detection assembly 4 can be further reduced.

The trigger 42 has a hinge portion 424, the hinge portion 424 and the trigger portion 423 are located on the left and right outer sides of the push rod 2, respectively, and the hinge portion 424 is rotatably connected to the mounting case 1. The hinge portions 424 and the trigger portions 423 are disposed on the left and right sides of the push rod 2, so that the distance between the trigger portions 423 and the hinge portions 424 can be increased, even if the detection protrusions 25 abut against the abutting portions 422 to rotate slightly, the trigger portions 423 can have relatively large rotation strokes relative to the sensing pieces 41, the movement of the abutting portions 422 can be amplified, the triggering reliability of the trigger portions 423 to the sensing pieces 41 can be ensured, meanwhile, the rotation stroke requirements of the detection protrusions 25 abutting against the abutting portions 422 can be reduced, the detection accuracy can be improved, and the response speed can be improved.

Further, the trigger member 42 includes a main body plate 421, the main body plate 421 is partially located below the push rod 2, the abutment portion 422 is protruding from the upper surface of the main body plate 421, and one side of the main body plate 421 extends out of the push rod 2 and is connected to the trigger portion 423. This arrangement can advantageously simplify the construction of the trigger 42. In the present embodiment, the body plate 421 abuts against the bottom of the accommodating groove, and the upper surface of the body plate 421 is lower than the bottom of the groove of the lever chute. The provision of the body plate portion 421 facilitates the mounting of the trigger member 42 within the receiving recess.

In the present embodiment, the main body plate 421 has a main body portion having two arm portions extending in the left-right direction, and the trigger portion 423 and the hinge portion 424 are connected to the two arm portions, respectively. Further, in the present embodiment, the body portion of the trigger 42 of the door opening position detecting assembly 4a is extended forward with the arm portion, and the tip of the arm portion is provided with the abutment portion 422, whereby the interval between the two abutment portions 422 can be increased while the two triggers 42 are arranged side by side, further improving the structural compactness.

The hinge part 424 is provided with a shaft perforation, the bottom of the accommodating groove is convexly provided with a mounting shaft, and the mounting shaft penetrates through the shaft perforation so as to realize the rotary connection of the hinge part 424 and the mounting box 1. A rib portion is preferably provided between the hinge portion 424 and the body plate portion 421, the rib portion being located outside the push rod 2, so as to enhance structural strength at the junction of the hinge portion 424 and the body plate portion 421.

In the present embodiment, two detection protrusions 25 are provided, and the two detection protrusions 25 are a door-opening detection protrusion 25a and a door-closing detection protrusion 25b, respectively, the door-opening detection protrusion 25a being capable of abutting against the abutting portion 422 of the door position detection assembly 4a when the push rod 2 slides to the door-opening detection position, and the door-closing detection protrusion 25b being capable of abutting against the abutting portion 422 of the door position detection assembly 4b when the push rod 2 slides to the door-closing detection position.

Through setting up two detection protruding 25 and respectively acting on two butt portions 422, can be on push rod 2 from closing the door detection position slip to the unchangeable basis of the slip single stroke of switch detection position for the position of the butt portion 422 of switch detection subassembly and the butt portion 422 of closing the door position detection subassembly 4b receives the influence of slip single stroke less, and the interval between two butt portions 422 need not to be the same with the slip single stroke, and can carry out nimble setting according to the position of switch detection protruding 25 and closing the door detection protruding 25b, improves the setting flexibility of opening the door position detection subassembly 4a and closing the door position detection subassembly 4 b.

In other embodiments, only one detecting protrusion 25 may be provided, and the detecting protrusion 25 may actuate the abutting portion 422 of the door closing position detecting assembly 4b when the push rod 2 slides to the door closing detecting position, and actuate the abutting portion 422 of the door opening position detecting assembly 4a when the push rod 2 slides to the door opening detecting position.

The door opening detection protrusions 25a and the door closing detection protrusions 25b are arranged at intervals in the width direction of the side edges where the door opening detection protrusions 25a and the door closing detection protrusions 25b are arranged at intervals in the front side of the door opening detection protrusions 25 a; the abutting portions 422 of the two position detecting units 4 are provided at intervals in the width direction, and the abutting portions 422 of the door closing position detecting unit 4b are provided at intervals on the rear side of the abutting portions 422 of the door opening position detecting unit 4 a.

That is, in the present embodiment, the two detection protrusions 25 are provided at intervals in the left-right direction, and the two abutment portions 422 are provided at intervals in the left-right direction. In other embodiments, if the detection protrusions 25 are provided on the other side of the push rod 2, both the detection protrusions 25 and the two abutment portions 422 are provided at intervals in the width direction of the side of the push rod 2.

The above arrangement makes it possible that when the push rod 2 slides to the door opening detection position, the door opening detection protrusion 25a located at the rear side abuts against the door opening abutment portion 422a located at the front side, and when the push rod 2 slides to the door closing detection position, the door closing detection protrusion 25b located at the front side abuts against the door closing abutment portion 422b located at the rear side, so that the interval between the two detection protrusions 25 in the front-rear direction is set irrespective of the stroke of the push rod 2, and as long as the push rod 2 is ensured to be in the door closing detection position, the front-rear interval between the door opening detection protrusion 25a and the door opening abutment portion 422a is equal to the stroke of the push rod 2 from the door closing detection position to the door opening detection position, and the interval between the door closing detection protrusion 25b and the door closing abutment portion 422b is equal to the stroke of the push rod 2 from the door opening detection position to the door closing detection position, thereby being capable of effectively providing the setting flexibility of the relative positions of the two abutment portions 422, so that the interval requirement of the two abutment portions 422 in the front-rear direction can be effectively reduced, the structure compactness can be improved in the side-by side in the front-rear direction, and the compactness can be reduced. Meanwhile, the two detection protrusions 25 are arranged at intervals in the left-right direction, the two abutting portions 422 are arranged at intervals in the left-right direction, so that when the push rod 2 is in a door closing detection position to a door opening detection position, the door opening detection protrusions 25a can pass through the door closing abutting portions 422b, and when the push rod 2 is in the door opening detection position to the door closing detection position, the door closing detection protrusions 25b can pass through the door opening abutting portions 422a, smooth sliding of the push rod 2 is guaranteed, and interference between structures is avoided.

In this embodiment, the door opening detecting protrusion 25a and the door opening abutting portion 422a are disposed opposite to each other in the front-rear direction, and the door closing detecting protrusion 25b and the door closing abutting portion 422b are disposed opposite to each other in the front-rear direction, so as to ensure the abutting reliability, reduce the requirement for the width of the push rod 2, and further improve the compactness.

In the present embodiment, the position detecting means 4 is a micro switch, that is, the state switching of the sensing piece 41 is achieved by the contact or separation between the triggering portion 423 and the sensing piece 41, whereby the detection accuracy can be detected. In other embodiments, the position detecting component 4 may also be a proximity door, that is, the signal switching of the sensing element 41 is controlled by the distance between the triggering portion 423 and the sensing element 41.

In order to reduce the detection cost, in the present embodiment, when the push rod 2 reaches the door opening detection position, the sensing element 41 of the door opening position detection assembly 4a is triggered by contact with the corresponding triggering portion 423, and is in a triggered state, and the sensing element 41 of the door closing position detection assembly 4b is not triggered by the corresponding triggering portion 423 but is in a non-triggered state; when the push rod 2 reaches the door closing detection position, the sensing piece 41 of the door closing assembly is in contact with the corresponding triggering part 423 to be in a triggering state, and the sensing piece 41 of the door opening position detection assembly 4a is not triggered by the corresponding triggering piece 42 to be in a non-triggering state; when the push rod 2 is between the door-open detection position and the door-closed detection position, both position detection assemblies 4 are in a non-triggered state.

In order to further improve the detection reliability, the position detecting assembly 4 further includes a reset element 43, where the reset element 43 is configured to maintain or restore the position detecting assembly 4 to a triggered state, so as to ensure that after the abutment 422 is separated from the detection protrusion 25, the trigger element 42 can implement automatic reset, and ensure the reliability of the next detection.

It will be appreciated that in other embodiments, if the position detecting assembly 4 is in the non-triggered state when the push rod 2 is not pushing against the trigger 42, the reset member 43 is used to maintain or restore the position detecting assembly 4 to the non-triggered state.

In this embodiment, the restoring member 43 is a compression spring, one end of the restoring member 43 is connected to or abuts against the mounting box 1, and the other end of the restoring member 43 is connected to the trigger member 42. In other embodiments, the restoring member 43 may be a torsion spring, which is sleeved on the mounting shaft and two ends of which are respectively connected with the hinge portion 424 and the mounting box 1.

The return member 43 is preferably mounted to the underside of the push rod 2 to improve compactness. One side of the main body is preferably convexly provided with a convex column part, and the first end of the resetting piece 43 is preferably sleeved on the convex column part so as to provide convenience for installation of the resetting piece 43.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims

1. The utility model provides an overload protection gear, its characterized in that includes two sub-gears and elasticity support and press subassembly (323), two the sub-gear is first sub-gear (321) and second sub-gear (322) respectively, two the sub-gear is in the axial side by side and fixed setting, two the recess is all seted up to the opposite one side of sub-gear, two the recess surrounds and is formed with the holding chamber, elasticity support and press subassembly (323) install in holding the chamber and follow the radial extension of sub-gear, elasticity support one end of pressing subassembly (323) with first sub-gear (321) are connected, elasticity support the other end of pressing subassembly (323) with second sub-gear (322) butt, elasticity supports and presses subassembly (323) are used for making overload protection gear two sub-gear linkage pivoted linkage state and two sub-gear relative pivoted separation state is switched.

2. The overload protection gear according to claim 1, wherein the groove wall of the second sub gear (322) is formed with an annular pressing groove wall (32211), the elastic pressing component (323) is abutted against the pressing groove wall (32211), and the elastic pressing component (323) is always in a compressed state to apply a pressing force to the pressing groove wall (32211), so that the two sub gears can keep synchronous rotation when the torque applied to any one sub gear is smaller than a preset torque, and the two sub gears relatively rotate when the torque applied to any one sub gear is larger than or equal to the preset torque.

3. The overload prevention gear according to claim 2, wherein the cross section of the pressing groove wall (32211) is a polygonal structure, and the apex angle of the polygonal structure is an obtuse angle.

4. The overload prevention gear according to claim 1, wherein the groove wall of the second sub gear (322) is formed with an annular pressing groove wall (32211), the inner end of the elastic pressing component (323) is connected with the first sub gear (321), and the outer end of the elastic pressing component (323) is abutted with the pressing groove wall (32211).

5. The overload protection gear according to claim 1, wherein the first sub-gear (321) comprises a gear body (3211), a main groove (32111) is formed on one surface of the gear body (3211) facing the second sub-gear (322), and a plurality of pairs of rib parts (3213) are formed at intervals along the circumferential direction of the gear body (3211) at the bottom of the main groove (32111); each pair of rib parts (3213) comprises two rib parts (3213) which are opposite and are arranged at intervals, and the grooves are formed between the two rib parts (3213).

6. The overload gear according to claim 5, wherein the rib portion (3213) extends outwardly in a direction away from the groove with a rib portion (3214), and the rib portion (3214) is spaced apart from the groove wall of the second sub gear (322).

7. The overload gear according to any one of claims 1-6, wherein one of the two sub-gears is provided with a hook portion (3212), the other one is provided with a central hole (3222), the hook portion (3212) passes through the central hole (3222) and abuts against an end face of the sub-gear, and the hook portion (3212) is provided with a plurality of hook portions at intervals around the central hole (3222).

8. The overload prevention gear according to claim 7, wherein the sub gear provided with the hook portion (3212) has a positioning portion (32132), the positioning portion (32132) is provided in plurality at intervals around the central hole (3222), and the positioning portion (32132) extends into the central hole (3222) and abuts against a wall of the central hole (3222).

9. The overload gear according to any one of claims 1 to 6, wherein the elastic pressing assembly (323) comprises an elastic member (3231) and a pressing member (3232), the elastic member (3231) extends in a radial direction of the sub-gear, one end of the elastic member (3231) is connected to the first sub-gear (321), the other end of the elastic member (3231) is connected to the pressing member (3232), and the pressing member (3232) is abutted to the second sub-gear (322).

10. The door opening and closing actuator comprises a driving mechanism (3) and a push rod (2), wherein the driving mechanism (3) drives the push rod (2) to move along a preset direction, and the door opening and closing actuator is characterized by further comprising an overload prevention gear according to any one of claims 1-9, wherein the driving mechanism (3) comprises a driving motor (31) and a gear set, the gear set comprises a plurality of transmission gears which are meshed in sequence, a worm (33) is sleeved on an output shaft of the driving motor (31), one side of the push rod (2) is provided with a rack part (23), and the gear set is meshed between the worm (33) and the rack part (23), and one transmission gear is the overload prevention gear.

11. Door opening and closing actuator according to claim 10, characterized in that one of said sub-gears is in engagement with said rack portion (23).

12. Door opening and closing actuator according to claim 10, characterized in that at least one of said transmission gears is a double gear comprising a co-axial gearwheel meshing with a worm (33) or with the transmission gear of an adjacent upper stage and a pinion meshing with a rack portion (23) or with the transmission gear of an adjacent lower stage.

13. The door opening and closing actuator according to any one of claims 10-12, characterized in that the front end of the push rod (2) has a latch tongue (22) cooperating with a door lock (200), the push rod (2) extending obliquely downwards from back to front;

And/or, the door opening and closing actuator further comprises a mounting box (1) with a mounting cavity, the driving mechanism (3) is mounted in the mounting cavity, the push rod (2) is slidably mounted in the accommodating cavity, and the front end of the push rod (2) extends out of the mounting cavity.

14. The door opening and closing actuator according to claim 13, wherein a guide protrusion (24) is convexly arranged on one side of the push rod (2), a guide chute is formed in a cavity wall of the installation cavity, the guide chute extends from back to front, and the guide protrusion (24) is slidably arranged in the guide chute.

15. Door opening and closing actuator according to any of claims 10-12, characterized in that the door opening and closing actuator further comprises a position detection assembly (4), the position detection assembly (4) being provided with two side by side in front of and behind;

the push rod (2) is provided with a detection protrusion (25), the detection protrusion (25) can enable one position detection assembly (4) to change signals when the push rod (2) slides to a preset door opening detection position, and the detection protrusion (25) can enable the other position detection assembly (4) to change signals when the push rod (2) slides to a preset door closing position.

16. A household appliance comprising a machine body and a machine door (500), wherein the lower end of the machine door (500) is hinged with the machine body, and the household appliance is characterized by comprising a door opening and closing actuator as claimed in any one of claims 10-15, wherein the door opening and closing actuator is arranged at the top end of the machine body, and the push rod (2) can extend forwards to push the machine door (500).

17. The household appliance according to claim 16, wherein the front end of the push rod (2) is provided with a latch portion (22), the top end of the machine door (500) is provided with a door lock (200), and the latch portion (22) can be locked or unlocked with the door lock (200).

18. A household appliance according to claim 17, wherein the driving mechanism (3) is capable of driving the push rod (2) to extend forward to eject the door (500) by a preset angle or driving the push rod (2) to retract backward to pull the door (500) back to a closed state when the tongue portion (22) is locked with the door lock (200).