A door hinge for a home appliance and a home appliance

Abstract

The present application relates to a door hinge for a household appliance and the household appliance, wherein the door hinge comprises: a housing in the shape of a long strip; a base connected to the housing and used to connect to a cabinet of the household appliance; a tongue hingedly connected to a front end of the housing at a first end thereof by a first pin shaft extending along a width direction of the housing and used to connect to a door body of the household appliance; and a transmission assembly arranged in the housing along a length direction of the housing and having an output end hingedly connected to the first end of the tongue by a first hinge shaft parallel to the first pin shaft; and characterized in that the door hinge further comprises: a motor having a power output shaft arranged along the width direction of the housing; and a crank constrained on the power output shaft of the motor, the crank being rotationally connected to an input end of the transmission assembly and being able to rotate with the motor to in turn drive the transmission assembly to make reciprocating movement along the length direction of the housing. The door hinge can realize automatic opening and closing of the door, and the cooperation of the crank and the transmission assembly can reduce the torque to reduce the pressure of the motor.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and more particularly to a door hinge for household appliances and the household appliances themselves. Background Technology

[0002] The doors of household appliances such as steam ovens, ovens, and microwave ovens are mounted on the cabinet by hinges on the left and right sides at the bottom, allowing them to rotate back and forth. For example, Chinese utility model patent No. ZL 202022529893.2 (authorization announcement No. CN213909874U) discloses a hinge device for an air oven.

[0003] There are many types of existing hinge structures, but most hinges are currently mechanical and manual. For example, Chinese utility model patents ZL201320130245.7 (authorization announcement number CN203175236U) disclose an oven door hinge, and CN202223612368.2 (authorization announcement number CN218912601U) also disclose an oven door hinge. However, existing ovens require manual pulling of the oven door to overcome the tension of elastic elements such as compression springs and tension springs to open the door. Furthermore, the high temperatures during use of appliances such as steam ovens, ovens, and microwave ovens can cause the doors to become hot to the touch, thus affecting the user experience. Moreover, existing door hinges cannot adapt to the trends of electrification and intelligentization.

[0004] To address the aforementioned technical problems, Chinese utility model patent ZL201922110943.0 (authorization announcement number CN212002798U) discloses an electric door opening and closing device. While this device utilizes an electric actuator to move the drive arm back and forth within a receiving groove, indirectly driving the trigger to swing and thus opening and closing the hinge, the device directly pulls the hinge via the electric actuator. The large starting torque of the electric actuator at the moment of opening results in high pressure on the actuator, which can affect its lifespan.

[0005] Therefore, further improvements to existing technologies are needed. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a door hinge for household appliances that can realize automatic opening and closing of doors and reduce torque to reduce the pressure on electric actuators, in contrast to the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a household appliance that uses the above-mentioned door hinge, in contrast to the prior art.

[0008] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a door hinge for household appliances, comprising:

[0009] The shell is long and narrow;

[0010] The base connects to the housing and is used to connect to the casing of household appliances;

[0011] The tongue has a first end hinged to the front end of the housing via a first pin extending along the width of the housing, and a second end used to connect to the door of the household appliance.

[0012] A transmission assembly is disposed inside the housing along the length of the housing, and the output end of the transmission assembly is hinged to the first end of the tongue strip through a first hinge shaft parallel to the first pin shaft;

[0013] Its features also include:

[0014] The motor is mounted on the base, and its power output shaft is arranged along the width of the housing.

[0015] The crank is constrained on the power output shaft of the motor. The crank is rotatably connected to the input end of the transmission assembly. The crank can rotate with the motor, thereby driving the transmission assembly to reciprocate along the length of the housing.

[0016] In order to enable the crank to rotate with the motor, a first through hole is provided on the crank for it to be fitted onto the power output shaft of the motor. The cross-sectional shape of the first through hole is the same as the cross-sectional shape of the power output shaft of the motor, and the outer edge of the cross-section of the power output shaft of the motor is at least partially a straight segment, so that the crank can be fixedly installed on the power output shaft of the motor.

[0017] Specifically, the housing is also provided with a second through hole through which the power output shaft of the motor passes, and the power output shaft of the motor can rotate relative to the housing.

[0018] There are many types of transmission components. Preferably, the transmission component includes at least two connecting rods arranged sequentially along the length of the housing. Two adjacent connecting rods are hinged to each other in sequence. The front end of the foremost connecting rod is the output end of the transmission component, and the rear end of the rearmost connecting rod is the input end of the transmission component.

[0019] Preferably, there are two connecting rods, namely a first connecting rod and a second connecting rod. The front end of the first connecting rod is hinged to the bottom end of the tongue through a first hinge shaft. The rear end of the first connecting rod and the front end of the second connecting rod are hinged to the housing through a second hinge shaft. The rear end of the second connecting rod is rotatably connected to the crank through a third hinge shaft.

[0020] In order to enable the door to open or close, a first sliding groove is provided on the side wall of the housing for the second hinge shaft to slide, and the first sliding groove extends along the length of the housing.

[0021] In order to enable the crank to rotate and drive the transmission assembly to reciprocate along the length of the housing, the crank includes two opposing and spaced-apart first rotating arms and second rotating arms, and the rear end of the second connecting rod is constrained between the first rotating arms and the second rotating arms.

[0022] Preferably, the door hinge further includes a first pull bar and a second pull bar arranged along the length of the housing. The first pull bar and the second pull bar are respectively located on both sides of the second connecting rod. The front ends of the first pull bar and the second pull bar are mounted on the second hinge shaft. The rear ends of the first pull bar and the second pull bar are hinged to the housing through a first mounting shaft.

[0023] In order to provide tension to the transmission components, the door hinge also includes a tension spring arranged along the length of the housing, a second mounting shaft is installed at the rear end of the housing, the front end of the tension spring is mounted on the first mounting shaft, and the rear end of the tension spring is mounted on the second mounting shaft.

[0024] Preferably, a second sliding groove is provided on the side wall of the housing for the sliding of the first mounting shaft, and the second sliding groove extends along the length direction of the housing.

[0025] Preferably, the first link includes two opposing, spaced-apart first arms and second arms that both extend along the length of the housing. The front ends of the first arms and the second arms are hinged to the first end of the tongue via a first hinge shaft. The first end of the tongue extends between the first arms and the second arms.

[0026] To provide sufficient force when the door closes, a third mounting shaft, a roller, an elastic element, and a mounting component are provided between the first and second connecting arms. The first connecting arm has a third sliding groove along its length, and the second connecting arm has a fourth sliding groove along its length. The third and fourth sliding grooves are arranged opposite to each other. The two ends of the third mounting shaft are constrained in the third and fourth sliding grooves respectively in a way that allows them to slide back and forth. The roller is sleeved on the third mounting shaft, and the front end of the mounting component is constrained on the third mounting shaft. A first abutment is also provided between the first and second connecting arms. The first abutment has a hole for the rear end of the mounting component to be inserted. The elastic element is sleeved on the mounting component, and the mounting component has a second abutment for the first end of the elastic element to abut against it. The second end of the elastic element acts on the first abutment, so that the roller always tends to move towards the latch and abut against it.

[0027] There are many types of structures for the above-mentioned mounting components. Preferably, the mounting component includes two opposing first mounting rods and second mounting rods. The first mounting rods and second mounting rods are simultaneously inserted into the insertion hole. The front ends of the first mounting rods and second mounting rods are respectively provided with outwardly bent L-shaped mounting arms. Each mounting arm is provided with a third through hole for the third mounting shaft to pass through. The connection between the mounting arm and the corresponding first mounting rod and second mounting rod forms the above-mentioned second abutment.

[0028] To enable both automatic and manual opening and closing of the door, thus preventing the door from failing to operate in the event of a power outage, the second linkage includes a conversion component and a connecting rod. Both the conversion component and the connecting rod extend along the length of the housing. The front end of the conversion component serves as the front end of the second linkage, and the rear end of the conversion component is hinged to the front end of the connecting rod via a fourth hinge axis parallel to the second hinge axis. The rear end of the connecting rod serves as the rear end of the second linkage. The conversion component includes two opposing conversion arms, each with a fifth sliding groove for sliding along the fourth hinge axis. The fifth sliding groove extends along the length of the housing.

[0029] To reduce the output torque of the motor, the door hinge design must satisfy the following relationship:

[0030]

[0031] Wherein, a is the center distance between the first hinge shaft and the second hinge shaft; b is the center distance between the first pin shaft and the first hinge shaft; c is the horizontal center distance between the first pin shaft and the second hinge shaft; L is the horizontal center distance between the first pin shaft and the power output shaft of the motor; a2 is the center distance between the third hinge shaft and the power output shaft of the motor; b2 is the center distance between the second hinge shaft and the third hinge shaft; c2 is the horizontal center distance between the second hinge shaft and the power output shaft of the motor; e1 is the vertical center distance between the first pin shaft and the power output shaft of the motor; e2 is the vertical center distance between the second hinge shaft and the first pin shaft; α is the angle between the straight line formed by the centers of the first pin shaft and the first hinge shaft and the first connecting rod.

[0032] Preferably, the value of e1 is in the range of 6mm. <e1<12mm。

[0033] Preferably, the value of e2 is in the range of 6mm. <e2<15mm。

[0034] Preferably, the value of L is in the range of 120 mm. <L<140mm。

[0035] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a household appliance, characterized in that: it uses the door hinge as described above.

[0036] Compared with existing technologies, the advantages of this invention are as follows: by constraining the crank to the power output shaft of the motor and rotatably connecting the crank to the input end of the transmission assembly, the crank can rotate with the motor, thereby driving the transmission assembly to reciprocate along the length of the housing, and finally driving the latch to swing arm, thus realizing automatic door opening and closing. Therefore, this door hinge structure is simple, can realize automatic door opening and closing, and reduces torque through the cooperation of the crank and transmission assembly, thereby reducing motor stress and improving motor lifespan. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the steam oven in Embodiment 1 of the present invention;

[0038] Figure 2 This is a schematic diagram of the door hinge structure in Embodiment 1 of the present invention;

[0039] Figure 3 for Figure 2 Partial structural diagram (shell and base omitted);

[0040] Figure 4 for Figure 2 A sectional view;

[0041] Figure 5 for Figure 2 Exploded view;

[0042] Figure 6 This is a schematic diagram of the door hinge in Embodiment 1 of the present invention;

[0043] Figure 7 This is a schematic diagram of the door hinge structure in Embodiment 2 of the present invention;

[0044] Figure 8 for Figure 7 A partial structural diagram (base omitted);

[0045] Figure 9 for Figure 8 A partial structural diagram (shell omitted);

[0046] Figure 10 for Figure 7 A sectional view;

[0047] Figure 11 for Figure 9 Partial structural diagram;

[0048] Figure 12 for Figure 11 Partially exploded diagram. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0050] Example 1:

[0051] like Figure 1 As shown, the household appliance in this embodiment includes a door 1b and a cabinet 1c. The lower ends of the door 1b are hinged to the cabinet 1c via door hinges on both sides. The household appliances in this invention include, but are not limited to, cooking equipment such as steam ovens, ovens, and microwave ovens, as well as dishwashers, refrigerators, and disinfection cabinets, or combined appliances integrating at least one of the above.

[0052] like Figures 2-6 As shown, this embodiment includes a housing 1, a base 1a, a tongue 2, a connecting rod assembly 3, a motor 4, and a crank 5.

[0053] The housing 1 is elongated and has a U-shaped cross-section with the opening facing downwards. The base 1a has a U-shaped cross-section with the opening facing upwards. The housing 1 is installed inside the base 1a. Support blocks are provided on both sides of the base 1a to support the bottom of the housing 1, so that a space is formed between the bottom of the housing 1 and the bottom of the base 1a. The base 1a is fixedly installed with the housing 1. This space is used for the crank 5 to rotate.

[0054] The base 1a is connected to the housing 1 and to the cabinet 1c of the household appliance. The first end of the tongue 2 is hinged to the front end of the housing 1 via a first pin 13 extending along the width direction of the housing 1, and the second end of the tongue 2 is connected to the door 1b of the household appliance. The transmission assembly 3 is disposed inside the housing 1 along the length direction of the housing 1, and the output end of the transmission assembly 3 is hinged to the first end of the tongue 2 via a first hinge shaft 61 parallel to the first pin 13. The power output shaft 41 of the motor 4 is arranged along the width direction of the housing 1. The crank 5 is constrained on the power output shaft 41 of the motor 4, and the crank 5 is rotatably connected to the input end of the transmission assembly 3. The crank 5 can rotate with the motor 4, thereby driving the transmission assembly 3 to reciprocate along the length direction of the housing 1. In this embodiment, the motor 4 has a motor reduction gearbox, which is designed to be able to reverse drive under a certain torque. If the door 1b loses power during operation, the door 1b can be manually driven to reverse drive the motor and thus manually open and close the door.

[0055] The crank 5 has a first through hole 51 for mounting on the power output shaft 41 of the motor 4. The cross-sectional shape of the first through hole 51 is the same as that of the power output shaft 41 of the motor 4, and the outer edge of the cross-section of the power output shaft 41 of the motor 4 is at least partially a straight segment, so that the crank 5 can be fixedly mounted on the power output shaft 41 of the motor 4. In this embodiment, the power output shaft 41 of the motor 4 and the crank 5 are connected by a coupling structure. The housing 1 also has a second through hole 11 through which the power output shaft 41 of the motor 4 passes, allowing the power output shaft 41 of the motor 4 to rotate relative to the housing 1. Figure 4As shown, in this embodiment, the cross-section of the power output shaft 41 of the motor 4 has two straight segments on opposite sides and two arc segments on the other two opposite sides. In this way, the power output shaft 41 of the motor 4 can be confined within the first through hole 51 by the straight segments and cannot rotate.

[0056] The transmission assembly 3 includes at least two connecting rods arranged sequentially along the length of the housing 1. Adjacent connecting rods are hinged together sequentially. The front end of the foremost connecting rod is the output end of the transmission assembly 3, and the rear end of the rearmost connecting rod is the input end of the transmission assembly 3. For example... Figure 3 and Figure 4 In this embodiment, there are two connecting rods: a first connecting rod 31 and a second connecting rod 32. The front end of the first connecting rod 31 is hinged to the bottom end of the tongue 2 via a first hinge shaft 61. The rear end of the first connecting rod 31 is hinged to the front end of the second connecting rod 32 via a second hinge shaft 62 and is rotatably connected to the crank 5 via a third hinge shaft 63. In this embodiment, the first connecting rod 31 includes two opposing, spaced-apart first connecting arms 311 and 312, both extending along the length of the housing 1. The front ends of the first connecting arms 311 and 312 are hinged to the first end of the tongue 2 via the first hinge shaft 61. The first end of the tongue 2 extends between the first connecting arms 311 and 312. The crank 5 includes two opposing, spaced-apart first rotating arms 52 and 53. The rear end of the second connecting rod 32 is constrained between the first rotating arms 52 and 53.

[0057] Other examples Figure 3 As shown, the door hinge in this embodiment also includes a first pull bar 71, a second pull bar 72, and a tension spring 9 arranged along the length direction of the housing 1. The first pull bar 71 and the second pull bar 72 are respectively located on both sides of the second connecting rod 32. The front ends of the first pull bar 71 and the second pull bar 72 are mounted on the second hinge shaft 62. The rear ends of the first pull bar 71 and the second pull bar 72 are hinged to the housing 1 through the first mounting shaft 81. The second mounting shaft 82 is mounted at the rear end of the housing 1. The front end of the tension spring 9 is mounted on the first mounting shaft 81, and the rear end of the tension spring 9 is mounted on the second mounting shaft 82.

[0058] like Figure 5 As shown, in this embodiment, the side wall of the housing 1 is provided with a first slide groove 12 for sliding the second hinge shaft 62 and a second slide groove 14 for sliding the first mounting shaft 81. The first slide groove 12 and the second slide groove 14 both extend along the length direction of the housing 1.

[0059] like Figure 6 In the embodiment shown, the door hinge design must satisfy the following relationship:

[0060]

[0061] Where, a is the center distance between the first hinge shaft 61 and the second hinge shaft 62; b is the center distance between the first pin shaft 13 and the first hinge shaft 61; c is the horizontal center distance between the first pin shaft 13 and the second hinge shaft 62; L is the horizontal center distance between the first pin shaft 13 and the power output shaft 41 of the motor 4; a2 is the center distance between the third hinge shaft 63 and the power output shaft 41 of the motor 4; b2 is the center distance between the second hinge shaft 62 and the third hinge shaft 63; c2 is the horizontal center distance between the second hinge shaft 62 and the power output shaft 41 of the motor 4; e1 is the vertical center distance between the first pin shaft 13 and the power output shaft 41 of the motor 4; e2 is the vertical center distance between the second hinge shaft 62 and the first pin shaft 13; α is the angle between the straight line formed by the centers of the first pin shaft 13 and the first hinge shaft 61 and the first connecting rod 31.

[0062] When designing the door hinge of the steam oven, due to reasons such as installation position limitations, the value range of e1 is 6mm < e1 < 12mm (based on the overall height limitation of the door hinge), and the value range of e2 is 6mm < e2 < 15mm (based on the overall height limitation of the door hinge); the value range of L is 120mm < L < 140mm (considering the rod lengths of each connecting rod, too long connecting rods will reduce strength, and too short connecting rods will not have enough space).

[0063] The derivation process of the following relational expressions that need to be satisfied when designing the above door hinge is as follows:

[0064] Assume that the torque required to drive the door body is T, and the motor output torque is T2. According to mechanical analysis and calculation, it can be obtained that:

[0065]

[0066] That is:

[0067]

[0068] To make the motor output torque less than the door body driving torque, that is, T2 < T, the following relationship can be obtained:

[0069]

[0070] That is, it can be obtained:

[0071]

[0072] If the rod lengths of each connecting rod do not satisfy the above relationship, then T2 ≥ T, that is, the effect of reducing torque cannot be achieved, and the overall torque may not only not decrease, but may increase instead.

[0073] In this embodiment, the starting torque of the motor is large at the moment of door opening. Without the assistance of a tension spring, requiring a large output torque from the motor would result in a large motor size, affecting its lifespan and cost. Based on the force conditions, a spring is installed in a specific position to provide assistance at the moment of door opening, reducing motor pressure and overall size. This results in smaller current fluctuations and smoother overall operation during motor operation. Since some force is lost in the transmission force of the second link, causing power waste, a tension spring can compensate for some of this loss, reducing energy consumption. Furthermore, the force transmitted by the second link generates a component force that presses against the side wall of the housing slide at the second hinge shaft position, causing housing wear. The greater the force transmitted by the second link, the greater the positive pressure, leading to more severe housing wear. Adding a tension spring significantly reduces the force transmitted by the second link, thus solving the problem of severe housing wear.

[0074] Example 2:

[0075] like Figures 7-12 As shown, unlike Embodiment 1, this embodiment has a third mounting shaft 10a, a roller 10b, an elastic element 10c, and a mounting element 10d between the first connecting arm 311 and the second connecting arm 312. The first connecting arm 311 has a third sliding groove 311a along its length, and the second connecting arm 312 has a fourth sliding groove 312a along its length. The third sliding groove 311a and the fourth sliding groove 312a are arranged opposite to each other. The two ends of the third mounting shaft 10a are constrained in the third sliding groove 311a and the fourth sliding groove 312a respectively in a way that allows them to slide back and forth. The roller 10b is sleeved on the third... On the mounting shaft 10a, the front end of the mounting member 10d is constrained on the third mounting shaft 10a. A first abutment 10e is provided between the first connecting arm 311 and the second connecting arm 312. The first abutment 10e has an insertion hole 101e for the rear end of the mounting member 10d to be inserted. The elastic member 10c is sleeved on the mounting member 10d, and the mounting member 10d has a second abutment 101d for the first end of the elastic member 10c to abut. The second end of the elastic member 10c acts on the first abutment 10e, so that the roller 10b always has the tendency to move toward the tongue 2 and abut against the tongue 2. In this embodiment, the elastic member 10c is a compression spring.

[0076] like Figure 12 As shown, the mounting component 10d in this embodiment includes two opposing first mounting rods 102d and second mounting rods 103d. The first mounting rods 102d and second mounting rods 103d are simultaneously inserted into the insertion hole 101e. The front ends of the first mounting rods 102d and second mounting rods 103d are respectively provided with outwardly bent L-shaped mounting arms 104d. Each mounting arm 104d is provided with a third through hole 1041d for the third mounting shaft 10a to pass through. The connection between the mounting arm 104d and the corresponding first mounting rod 102d and second mounting rod 103d forms the aforementioned second abutment 101d.

[0077] Other examples Figure 9 and Figure 10 As shown, the second link 32 in this embodiment includes a conversion member 321 and a connecting member 322. Both the conversion member 321 and the connecting member 322 extend along the length direction of the housing 1. The front end of the conversion member 321 serves as the front end of the second link 32. The rear end of the conversion member 321 is hinged to the front end of the connecting member 322 via a fourth hinge shaft 64 parallel to the second hinge shaft 62. The rear end of the connecting member 322 serves as the rear end of the second link 32. The conversion member 321 includes two opposing conversion arms 3211. A fifth sliding groove 641 is provided on the conversion arm 3211 for the fourth hinge shaft 64 to slide. The fifth sliding groove 641 extends along the length direction of the housing 1.

[0078] On the one hand, in this embodiment, the elastic element 10c constantly applies a force to the third mounting shaft 10a, thereby causing the third mounting shaft 10a to always tend to be located close to the front side of the third slide groove 311a and the fourth slide groove 312a, so that the roller 10b sleeved on the third mounting shaft 10a always tends to move towards the tongue 2 and abut against the tongue 2. Since the tongue 2 is provided with a notch (such as... Figure 10 As shown), when the door 1b is closed, the roller 10b slides into the notch of the tongue 2 to provide sealing force for the door. On the other hand, through the fifth slide groove 641 opened on the conversion arm 3211, the fourth hinge shaft 64 can slide in the fifth slide groove 641 under the driving force of the motor 4, so that the door can be opened and closed automatically, and the fourth hinge shaft 64 can be driven to slide in the fifth slide groove 641 under the action of external force to realize the door opening and closing manually.

[0079] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A door hinge for household appliances, comprising: The shell (1) is long and narrow; The base (1a) is connected to the housing (1) and is used to connect to the cabinet (1c) of the household appliance; The first end of the tongue (2) is hinged to the front end of the housing (1) by a first pin (13) extending along the width direction of the housing (1), and the second end of the tongue (2) is used to connect to the door (1b) of the household appliance. The transmission assembly (3) is disposed inside the housing (1) along the length direction of the housing (1). The output end of the transmission assembly (3) is hinged to the first end of the tongue strip (2) through a first hinge shaft (61) parallel to the first pin shaft (13). Its features also include: The motor (4) is mounted on the base (1a), and its power output shaft (41) is arranged along the width direction of the housing (1); The crank (5) is constrained on the power output shaft (41) of the motor (4). The crank (5) is rotatably connected to the input end of the transmission assembly (3) through the third hinge shaft (63). The crank (5) can rotate with the motor (4) and then drive the transmission assembly (3) to reciprocate along the length direction of the housing (1). The transmission assembly (3) includes a first connecting rod (31) and a second connecting rod (32) arranged sequentially along the length of the housing (1). The front end of the first connecting rod (31) is the output end of the transmission assembly (3). The rear end of the first connecting rod (31) and the front end of the second connecting rod (32) are hinged to the housing (1) through a second hinge shaft (62). The rear end of the second connecting rod (32) is the input end of the transmission assembly (3).

2. The door hinge according to claim 1, characterized in that: The crank (5) has a first through hole (51) for mounting on the power output shaft (41) of the motor (4). The cross-sectional shape of the first through hole (51) is the same as that of the power output shaft (41) of the motor (4), and the outer edge of the cross-section of the power output shaft (41) of the motor (4) is at least partially a straight segment, so that the crank (5) can be fixedly mounted on the power output shaft (41) of the motor (4).

3. The door hinge according to claim 2, characterized in that: The housing (1) is also provided with a second through hole (11) through which the power output shaft (41) of the motor (4) passes, and the power output shaft (41) of the motor (4) can rotate relative to the housing (1).

4. The door hinge according to claim 1, characterized in that: The side wall of the housing (1) is provided with a first groove (12) for sliding the second hinge shaft (62), and the first groove (12) extends along the length direction of the housing (1).

5. The door hinge according to claim 4, characterized in that: The crank (5) includes a first rotating arm (52) and a second rotating arm (53) arranged opposite to each other, and the rear end of the second connecting rod (32) is constrained between the first rotating arm (52) and the second rotating arm (53).

6. The door hinge according to claim 5, characterized in that: The door hinge also includes a first pull bar (71) and a second pull bar (72) arranged along the length direction of the housing (1). The first pull bar (71) and the second pull bar (72) are respectively located on both sides of the second connecting rod (32). The front end of the first pull bar (71) and the front end of the second pull bar (72) are mounted on the second hinge shaft (62). The rear end of the first pull bar (71) and the rear end of the second pull bar (72) are hinged to the housing (1) through the first mounting shaft (81).

7. The door hinge according to claim 6, characterized in that: The door hinge also includes a tension spring (9) arranged along the length of the housing (1), and a second mounting shaft (82) is installed at the rear end of the housing (1). The front end of the tension spring (9) is installed on the first mounting shaft (81), and the rear end of the tension spring (9) is installed on the second mounting shaft (82).

8. The door hinge according to claim 7, characterized in that: The side wall of the housing (1) is provided with a second slide groove (14) for sliding the first mounting shaft (81), and the second slide groove (14) extends along the length direction of the housing (1).

9. The door hinge according to claim 1, characterized in that: The first link (31) includes two opposing, spaced-apart first arms (311) and second arms (312) that extend along the length of the housing (1). The front ends of the first arms (311) and the second arms (312) are hinged to the first end of the tongue (2) via a first hinge shaft (61). The first end of the tongue (2) extends between the first arms (311) and the second arms (312).

10. The door hinge according to claim 9, characterized in that: A third mounting shaft (10a), a roller (10b), an elastic element (10c), and a mounting component (10d) are provided between the first connecting arm (311) and the second connecting arm (312). The first connecting arm (311) has a third sliding groove (311a) along its length, and the second connecting arm (312) has a fourth sliding groove (312a) along its length. The third sliding groove (311a) and the fourth sliding groove (312a) are arranged opposite to each other. The two ends of the third mounting shaft (10a) are respectively constrained in the third sliding groove (311a) and the fourth sliding groove (312a) in a way that allows them to slide back and forth. The roller (10b) is sleeved on the third mounting shaft (10a). The front end of the mounting component (10d) is constrained on the third mounting shaft (10a). A first abutment (10e) is provided between the first connecting arm (311) and the second connecting arm (312). The first abutment (10e) is provided with an insertion hole (101e) for the rear end of the mounting component (10d) to be inserted. The elastic element (10c) is sleeved on the mounting component (10d). The mounting component (10d) is provided with a second abutment (101d) for the first end of the elastic element (10c) to abut. The second end of the elastic element (10c) acts on the first abutment (10e), so that the roller (10b) always has the tendency to move toward the tongue (2) and abut against the tongue (2).

11. The door hinge according to claim 10, characterized in that: The mounting component (10d) includes two opposing first mounting rods (102d) and second mounting rods (103d). The first mounting rods (102d) and second mounting rods (103d) are simultaneously inserted into the insertion hole (101e). The front ends of the first mounting rods (102d) and second mounting rods (103d) are respectively provided with outwardly bent L-shaped mounting arms (104d). Each mounting arm (104d) is provided with a third through hole (1041d) for the third mounting shaft (10a) to pass through. The connection between the mounting arm (104d) and the corresponding first mounting rod (102d) and second mounting rod (103d) forms the aforementioned second abutment (101d).

12. The door hinge according to any one of claims 1 to 11, characterized in that: The second link (32) includes a conversion member (321) and a connecting member (322). Both the conversion member (321) and the connecting member (322) extend along the length direction of the housing (1). The front end of the conversion member (321) serves as the front end of the second link (32). The rear end of the conversion member (321) is hinged to the front end of the connecting member (322) through a fourth hinge axis (64) parallel to the second hinge axis (62). The rear end of the connecting member (322) serves as the rear end of the second link (32). The conversion member (321) includes two opposing conversion arms (3211). A fifth sliding groove (641) is provided on the conversion arm (3211) for the fourth hinge axis (64) to slide. The fifth sliding groove (641) extends along the length direction of the housing (1).

13. The door hinge according to any one of claims 1 to 11, characterized in that: The door hinge design must satisfy the following relationship: in, The center distance between the first hinge axis (61) and the second hinge axis (62); The center distance between the first pin (13) and the first hinge shaft (61); The horizontal center distance between the first pin (13) and the second hinge pin (62); The horizontal center distance between the first pin (13) and the power output shaft (41) of the motor (4); The center distance between the third hinge shaft (63) and the power output shaft (41) of the motor (4); The center distance between the second hinge axis (62) and the third hinge axis (63); The horizontal center distance between the second hinge shaft (62) and the power output shaft (41) of the motor (4); The vertical center distance between the first pin (13) and the power output shaft (41) of the motor (4); The perpendicular center distance between the second hinge shaft (62) and the first pin shaft (13); The angle between the straight line formed by the center of the first pin (13) and the first hinge shaft (61) and the first connecting rod (31).

14. The door hinge according to claim 13, characterized in that: The The range of values ​​is .

15. The door hinge according to claim 13, characterized in that: The The range of values ​​is .

16. The door hinge according to claim 13, characterized in that: The The range of values ​​is .

17. A household appliance, characterized in that: The application is a door hinge as described in any one of claims 1 to 16 above.

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