CN216172892U - Food preparation machine with stable operation - Google Patents

Abstract

The utility model discloses a food processing machine with stable operation, which comprises a cup cover and a host machine which is matched with the cup cover and arranged, wherein the host machine comprises a shell, a motor and a reduction gearbox structure, the motor is positioned in the shell, the reduction gearbox structure is provided with a planetary wheel set, the planetary wheel set comprises a first-stage planetary wheel set and a second-stage planetary wheel set, the reduction gearbox structure comprises a gear ring which is arranged around the outer sides of the first-stage planetary wheel set and the second-stage planetary wheel set, the second-stage planetary wheel set comprises a second-stage planetary wheel, the gear ring comprises a first gear ring and a second gear ring which are fixedly connected, the first gear ring and the second gear ring which are fixedly connected are arranged at the bottom of the shell, a concave cavity for accommodating the bottom of the shell is arranged on the cup cover, and at least the second-stage planetary wheel sinks into the concave cavity. The problems that the output is unstable and the working noise is large due to the fact that the two-stage planetary wheel set is prone to deflection and/or axial movement in the working process on the premise that the food processor is provided with the cup cover are solved.

Description

Food preparation machine with stable operation

Technical Field

The utility model relates to the technical field of domestic appliances, in particular to a food processor with stable operation.

Background

Conventional multi-purpose food processors, such as CN202020592171.9 (hereinafter referred to as "patent 1") and CN201320659693.6 (hereinafter referred to as "patent 2"), disclose a multi-purpose food processor that includes a mechanism capable of achieving different output speeds through two-stage speed reduction to accommodate different functions, such as high speed for mincing meat, and relatively low operating speed for beating eggs and kneading dough.

Specifically, patent 1 discloses a gearbox assembly and multi-functional food processor, realizes that the rotational speed of first output shaft is greater than the rotational speed of second output shaft including two-stage planet variable speed subassembly. In patent 1, the setting of split type first ring gear and second ring gear not only increases the complexity of assembly, can influence the axiality of first level planetary gear set and second level planetary gear set moreover, leads to multistage output unstability. Meanwhile, the bottom surface of the second-stage planetary gear set is obviously higher than the cup cover, so that the gravity center of the host is improved, the limiting difficulty of a user on the host and the cup cover is increased, the phenomenon that the host is unstable in operation is easy to occur, and larger working noise is generated.

Patent 2 discloses a high low output speed output structure of hand-held type mixer host computer, including enclosing the ring gear of establishing big or small planet wheel, its lower ring that holds second grade planetary gear set directly does the lower terminal surface for the casing to through two planetary gear sets of motor and the relative centre gripping of retainer plate fixed. In patent 2, the host computer that contains two-stage planet wheel speed change structure is heavy, and only two planet wheelsets of motor and relative centre gripping of retainer plate are not fixed through ring gear and casing, and the reliability of fixing the planet wheelset is relatively weak like this, very easily leads to the planet wheelset to produce beat or rock. In addition, patent 2 does not set up the bowl cover, needs the direct and cup cooperation of host computer lower extreme, because there is not stopping of bowl cover to have the risk of taking over the machined part injury to the user when taking off the host computer after the processing, eats the material and splashes to the ring down easily and increase the washing degree of difficulty of host computer in the work, if eat inside the material infiltration casing, touches second level planetary gear set at first, second level planetary gear set has the risk of card shell inefficacy.

More importantly, neither patent 1 nor patent 2 considers the following problems:

1. the first-stage planetary gear set has high rotating speed and small torque, and the second-stage planetary gear set has low rotating speed and large torque. If the gear ring of the meshing two-stage planetary gear set is not fixed on the shell, in the working process, particularly when the low-rotation-speed and high-torque functional operation such as surface mixing is carried out, the planetary gear set can generate the phenomenon of axial float or radial deflection, so that larger working noise is generated, the coaxiality of the two-stage planetary gear set is reduced, and the stability of two-stage output is influenced.

2. In order to facilitate the disassembly of a user, the connection between any output end of the food processor with multi-output and a workpiece in the cup body is loose clearance fit. Particularly, when dough is kneaded, the dough is eccentrically pressed to form a machined part, and the machined part is easily eccentrically vibrated by matching with the main machine, so that the coaxiality of the two-stage planetary gear set is reduced, the stable output of the main machine is influenced, and the operation of the machined part is unstable.

3. The two-stage planetary gear set generates more friction from the gears than the one-stage planetary gear set, which causes more noise.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a food processor with stable operation, which at least solves the problems of unstable output and high working noise caused by easy deflection and/or axial movement of a two-stage planetary gear speed change wheel set in the working process on the premise that the food processor is provided with a cup cover.

In order to achieve the purpose, the utility model provides a food processor with stable operation, which comprises a cup cover and a host machine which is matched with the cup cover and arranged, wherein the host machine comprises a shell, a motor positioned in the shell and a reduction gearbox structure provided with a planetary wheel set, the planetary wheel set comprises a first-stage planetary wheel set and a second-stage planetary wheel set, the reduction gearbox structure comprises a gear ring which is arranged around the outer sides of the first-stage planetary wheel set and the second-stage planetary wheel set, the second-stage planetary wheel set comprises a second-stage planetary wheel, the gear ring comprises a first gear ring and a second gear ring which are fixedly connected, the first gear ring and the second gear ring which are fixedly connected are fixedly arranged at the bottom of the shell, a concave cavity for accommodating the bottom of the shell is arranged on the cup cover, and at least the second-stage planetary wheel sinks into the concave cavity.

The gear ring comprises a first gear ring and a second gear ring which are fixedly connected. Compare current split type ring gear, first ring gear and second ring gear behind the fixed connection are better to the radial movement's of two-stage planetary gear set suppression effect, effectively guarantee the axiality of first order planetary gear set and second level planetary gear set, reduce the noise that the radial wear between the two-stage planetary gear set produced, guarantee good transmission output. That is to say, fixed connection's first ring gear and second ring gear have realized that first way is right to protect and fall the noise two-stage planetary gear set, provide first way guarantee for the operating stability of complete machine.

Furthermore, in order to reduce radial shaking of the two-stage planetary gear set and the gear ring and improve the working stability of the two-stage planetary gear set, the first gear ring and the second gear ring which are fixedly connected are fixedly arranged at the bottom of the casing. The first gear ring and the second gear ring are fixed on the casing, so that the deflection or shaking of the whole reduction gearbox structure in the casing is inhibited, and the axial movement and the radial deflection of the planetary gear set are inhibited. That is to say, the reducing gear box structure can't take place relative collision with the casing to restrain the beat or rock of reducing gear box structure in the casing inside, reduce the noise that reducing gear box structure and casing collision produced, promote the stability of every grade of output. The fixation of the gear ring and the casing forms a second reinforced centering protection and noise reduction for the deflection of the two-stage planetary gear set, and a second guarantee is provided for the operation stability of the whole machine.

Meanwhile, on the premise that the reduction gearbox structure is firmly fixed in the shell, compared with the existing host only comprising the planetary gear speed change structure, the host comprising the two-stage planetary gear speed change structure has the advantages of increased height and improved gravity center. Moreover, the existence of the second-stage planetary gear set, especially the second-stage planetary gear set, is a main factor causing the height of the main machine, the gravity center lifting and the noise increasing. Consequently, this application is through setting up the cavity that is equipped with holding chassis bottom on the bowl cover, at least the second level planet wheel sinks in the cavity to let the cavity of bowl cover and the coincidence height of host computer increase, offset the height of second level planet wheel at least, thereby reduce the casing of host computer and expose in the height of bowl cover, the focus of host computer is more close to the bowl cover, and the focus of two-stage planet wheelset is in the high region of cavity. The center of gravity of the two-stage planetary gear set is in the height area of the concave cavity, so that the center of gravity of the reduction gearbox structure is also in the height area of the concave cavity. On the one hand for the main source that the bowl cover parcel produced the noise, second level planet wheel promptly, thereby reduce the noise that host computer self produced. On the other hand, the gravity center of the reduction gearbox structure is reduced, and the running stability of the host machine is improved, so that the deflection noise of the host machine is reduced when the host machine is matched with the cup cover. That is to say, the cavity of bowl cover has formed the protection of righting to the host computer, and the indirect third that has formed the two-stage planetary gear set of cavity is equivalent to right the protection and fall the noise, provides the third guarantee for the operating stability of complete machine.

Through three ways to two-stage planetary gear set from inside to outside right the protection and fall the noise, the effectual beat that has restrained the two-stage planetary gear set of reducing gear box structure in the course of the work has promoted the cooperation stability of host computer and bowl cover, has promoted the axiality of two-stage planetary gear set to reduce the noise at work of host computer, promote the stability of output, guarantee whole food preparation machine's operation stability. Therefore, even when the dough kneading function with low rotating speed and high torque is carried out, the two-stage planetary gear set can better keep the coaxiality, the eccentric vibration of the main machine caused by the eccentric pressing of the dough on one side of the processed piece is reduced, and the stability of the output is ensured.

Preferably, the width of the cavity is L, the height of the portion of the planetary gear set located in the cavity is H, and the ratio of H to L ranges from 0.15 to 0.80.

The wider the width L of the cavity, the wider the bottom of the casing matched with the cavity, and the wider the radial width of the second-stage planetary gear set of the reduction gearbox structure, so that the gravity center of the main engine is lowered and the main engine can easily fall into the area of the cavity. When only the second-stage planetary gear set is positioned in the concave cavity, the height value H of the part of the planetary gear set positioned in the concave cavity is equivalent to the height of the second-stage planetary gear set; when the two-stage planetary gear set is located in the concave cavity, the H value is equivalent to the total height of the two-stage planetary gear set. In contrast, the latter has a larger H value and a lower center of gravity of the host. However, there is a correlation between the L value and the H value: if the value of H/L is less than 0.15, the width of the cavity is too wide, and the height of the planetary gear set embedded in the cavity is low. At this time, on one hand, the host is difficult to be stably embedded in the cavity; on the other hand, the width of the main unit is too wide, which affects the appearance of the main unit. If the value of H/L is more than 0.80, the width of the concave cavity is too narrow, the planetary wheel set is slender, the effect of lowering the gravity center of the main machine is not obvious, and the overlapping part of the cup cover and the cup body is increased due to the increase of the depth of the concave cavity, so that the available volume of the cup body is reduced.

Therefore, the ratio range of H to L is set to be 0.15-0.80, so that the gravity center of the host machine is favorably lowered, and the gravity center of the reduction gearbox structure is particularly ensured to be positioned in the concave cavity area, so that the bottom of the machine shell is more stably matched with the concave cavity; and the concave cavity is not too wide, so that the bottom of the machine shell is also not too wide, and the attractiveness of the host machine is not affected.

Preferably, the second-stage planetary gear set further comprises a second-stage sun gear meshed with the second-stage planetary gear, and the meshed part of the second-stage sun gear and the second-stage planetary gear is sunk into the concave cavity.

When the second-stage planetary gear set realizes the second-stage speed reduction, the generated rotating speed is low but the torque is large, and the noise generated by the meshing transmission between the second-stage planetary gear and the second-stage sun gear is larger. Therefore, this application through set up the second level sun gear with the meshing part of second level planet wheel sinks to be in the cavity to the meshing part parcel that will produce the noise separates the fender to the noise production of second level planet wheelset's noise, thereby plays the effect of making an uproar. In addition, the gravity center of the meshing parts of the two is also reduced, so that the meshing transmission of the two is more stable, and the stable output of the low-speed output end is ensured.

Preferably, the reduction gearbox structure further comprises an upper cover plate arranged above the gear ring in a covering mode, a fixed support is arranged on the gear ring or the upper cover plate in a protruding mode along the radial direction, the gear ring is fixedly connected with the base of the casing through the fixed support, and the fixed support is at least wrapped by the concave cavity in height.

In order to not destroy the stability of the matching of the gear ring and the two-stage planetary gear set and realize the fixed connection of the gear ring and the casing, a fixed bracket is arranged on the gear ring or the upper cover plate and protrudes outwards along the radial direction. Because the main factor of the weight increase of the main machine is the reduction gearbox structure, the higher the relative position of the reduction gearbox structure in the machine shell is, the higher the gravity center of the main machine is, and the higher the possibility of the main machine to deflect in the running process is. Therefore, the gear ring is arranged in the gear ring fixing device, and the gear ring is fixedly connected with the base of the machine shell through the fixing support so as to fix the reduction gearbox structure on the base. Therefore, on one hand, the gravity center of the main machine is reduced, and the axial movement of the planetary wheel set is restrained to reduce noise; on the other hand, the two-stage planetary gear set is righted, and the coaxiality between the first-stage planetary gear set and the second-stage planetary gear set is guaranteed, so that the running and output stability of the host is guaranteed.

Meanwhile, on the premise that the reduction gearbox structure is firmly fixed in the reduction gearbox, the concave cavity is arranged to at least wrap the fixed support in height, so that the height of the concave cavity of the cup cover and the height of the matching part of the main machine are increased, and the height of the second-stage planetary wheel set is at least offset. When the fixed support is positioned on the upper cover plate, the first-stage planetary gear set and the second-stage planetary gear set are both positioned in the height area of the concave cavity; when the fixed support is positioned on the gear ring, at least the second-stage planetary gear set is ensured to be positioned in the height area of the concave cavity. The two modes effectively reduce the height of the part of the main machine exposed out of the cup cover, so that the gravity center of the main machine is closer to the cup cover, and the deflection of the main machine when the main machine is matched with the cup cover is reduced. Therefore, the fixed height of the gear ring and the base is close to the gravity center of the gearbox structure, namely the fixed support is close to the gravity center of the gearbox structure, and therefore the working stability of the two-stage planetary gear set is improved.

Preferably, the fixed support is a plate-shaped structure, the plate-shaped structure is provided with at least two mounting holes, first fixing columns which are matched with the mounting holes one by one are arranged in the base, and the mounting holes and the first fixing columns are fastened through fixing pieces.

The fixed position is arranged on the fixed support in order not to damage the integrity of the ring gear and not to influence the meshing of the ring gear and the two-stage planetary gear set. The fixing support is arranged to be of a plate-shaped structure, and machining of the mounting hole is facilitated. Through set up first fixed column on the base, mounting hole one-to-one cooperation on first fixed column and the fixed bolster to fasten fixed bolster and mounting hole in order to realize the fixed of platelike structure and base through the mounting, thereby indirectly realize the fixed of ring gear and base, guarantee the job stabilization nature of two-stage planetary gear set.

Preferably, a second fixing column extending upwards is arranged on the bottom cover of the casing, a vacancy avoiding position is arranged on the fixing support and avoids the installation hole, and the second fixing column is inserted into the vacancy avoiding position to realize circumferential rotation positioning of the gear ring.

In order to limit the circumferential rotation of the gear ring and influence the stability of the speed reduction output of the reduction gearbox structure, the bottom cover of the shell is further provided with a second fixing column which extends upwards, the fixing support is provided with a space avoiding position, the second fixing column is inserted into the space avoiding position to realize the circumferential rotation positioning of the gear ring, the gear ring is guaranteed to be static, the two stages of planetary wheel sets rotate, and the precision of the two stages of output is improved.

Preferably, the fixed support is arranged at the joint of the first gear ring and the second gear ring, and the first gear ring, the second gear ring and the fixed support are integrally formed.

The fixed support is arranged at the joint of the first gear ring and the second gear ring, so that the center of the fixed support is closer to the gravity center of the gear ring, the deflection of the gear ring is reduced, and the first gear ring and the second gear ring are distributed evenly.

Meanwhile, the first gear ring, the second gear ring and the fixed support are integrally formed, so that on one hand, the radial limiting of the gear ring on the two-stage planetary gear set is favorably ensured, and the coaxiality and the output stability of the two-stage planetary gear set are ensured; on the other hand, the fixed support is integrally formed on the gear ring, so that the processing technology is simplified, and when the fixed support is fixedly arranged with the base of the shell, the limit of the gear ring and the two-stage planetary gear set in the gear ring is more reliable.

Preferably, the bowl cover still includes the annular convex part that forms the cavity, annular convex part is sealed cavity structure, the casing includes the base of fixed bolster, the upper surface of second grade planetary gear set is apart from the height of the bottom surface of base is H1, the height of base is H2, the height of annular convex part is H3, H3 > H2 > H1.

The base forms a first layer of barrier to noise generated by the second stage planetary gear set by setting the height H2 of the base to be greater than the height H1 of the upper surface of the second stage planetary gear set from the bottom surface of the base, namely H2 > H1. Meanwhile, the height H3 of the annular convex part is larger than the height H2 of the base, namely H3 is larger than H2, so that the height of the base is accommodated in the concave cavity of the cup cover, the second-stage planetary gear set and the base are completely accommodated in the concave cavity, the annular convex part is used for righting the base, righting of the second-stage planetary gear set is indirectly formed, deflection of the second-stage planetary gear set is prevented, and the stability of the host on the cup cover is improved. Further, still through setting up the annular convex part for sealed cavity structure, the height H3 of annular convex part is greater than the upper surface distance of second level planetary gear set the height H1 of the bottom surface of base, H3 > H1 promptly for sealed annular convex part is lived the effective parcel of sound source especially second level planetary gear set that produces the noise, when the sound wave outwards diffuses to annular convex part, sealed annular convex part produces reverse sound wave, in order to neutralize the noise, thereby the noise of food preparation machine's operating has been reduced, effectively promote user experience.

Preferably, be equipped with the inner baffle that radially inwards extends in the ring gear, the inner baffle will the inner chamber of ring gear is separated into the first cavity that holds first order planetary gear set to and hold the second cavity of second level planetary gear set, first order planetary gear set is from last down installing in first cavity, and second level planetary gear set is from down up installing in the second cavity.

Through set up the interior baffle of radial inward extension in the ring gear, the interior baffle will the inner chamber of ring gear is separated into the first cavity that holds first order planetary gear set to and hold the second cavity of second level planetary gear set, make the first order planetary gear set of different speeds and second level planetary gear set can not take place wearing and tearing, thereby reduce the noise of work. In addition, no abrasion exists, relative friction force does not exist between the lower surface of the first-stage planetary gear set and the upper surface of the second-stage planetary gear set, and therefore the error of the output speed is reduced. Simultaneously, still through setting up first order planetary gear set is from last down installing in first cavity, and the second level planetary gear set is from up installing in the second cavity down, compares like this that two-stage planetary gear set all from up the mode of installing down, and the degree of depth of installation is shallower, more convenient, also can not interfere between two-stage planetary gear sets.

Preferably, the reduction gearbox structure further comprises a bottom cover plate positioned at the lower end of the gear ring, a support part used for limiting the inclination of the bottom cover plate is arranged on the base of the casing, the support part is positioned below the bottom cover plate, and the support part is far away from the center of the bottom cover plate; and/or the lower surface of the bottom cover plate is provided with an upper annular rib, and the inner bottom surface of the base of the machine shell is provided with a lower annular rib which is mutually spliced and matched with the upper annular rib.

In order to prevent the deflection of the reduction gearbox structure from influencing the output stability, a supporting part used for limiting the inclination of the bottom cover plate is also arranged on the base, and the supporting part is positioned below the bottom cover plate. When the two-stage planetary gear set deflects to drive the gear ring to deflect, the bottom cover plate connected with the gear ring also deflects. At the moment, the supporting part below the bottom cover plate supports and catches the bottom cover plate and assists the bottom cover plate to return to the right direction, so that the gear ring and the two-stage planetary wheel set are driven to return to the right direction. Meanwhile, in order to improve the aligning effect of the supporting part, the supporting part is far away from the center of the bottom cover plate. Thus, the moment arm of the support portion is increased, and the force required by the support portion to straighten the gear ring is reduced. Can effectively promote the effect of rightting, can avoid again causing wearing and tearing to the supporting part to the bottom cover board. Meanwhile, in order to further reduce the radial deflection of the reduction gearbox structure, an upper ring rib arranged on the lower surface of the bottom cover plate and a lower ring rib arranged on the inner bottom surface of the base are mutually inserted to inhibit the radial deflection of the gear ring. And the gear ring is surrounded on the outer side of the two-stage planetary gear set, so that the radial deflection of the two-stage planetary gear set is indirectly inhibited, and the coaxiality of the two-stage planetary gear set and the stability of each stage of output are further ensured. The stability is enhanced, so that the abrasion of the two-stage planetary gear set, the collision between the two-stage planetary gear set and the gear ring or the collision between the gear ring and the shell are greatly reduced, and the noise generated by the work of the main engine is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic diagram of a food processor according to one embodiment of the present invention;

FIG. 2 is a schematic structural view of a main body and a lid of a food processor according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of area A indicated in FIG. 2;

FIG. 4 is an exploded view of a mainframe in accordance with one embodiment of the present invention;

FIG. 5 is an exploded view of the motor and reduction gearbox arrangement in accordance with one embodiment of the present invention;

FIG. 6 is an exploded view of the motor and reduction gearbox structure and the base of the enclosure in accordance with one embodiment of the present invention;

FIG. 7 is a top view of a ring gear with a fixed bracket mounted thereto in accordance with one embodiment of the present invention.

Description of reference numerals:

1-a host; 11-a housing; 111-upper cover; 1111-screw column; 112-a base; 1121-lower ring rib; 1122-first fixed column; 1123-second fixed column; 12-a motor; 2-processing the cup assembly; 21-a cup cover; 211-annular boss; 212-a cavity; 22-cup body; 23-a work piece; 3-a reduction gearbox structure; 31-first stage planetary gear set; 311-first stage planet wheel upper support; 312-first stage planets; 313-first stage planet wheel lower support; 314-first stage sun gear; 32-a second stage planetary gear set; 321-a second-stage planet wheel upper support; 322-second stage planets; 323-second stage planet wheel lower support; 324-a second stage sun gear; 33-a gear ring; 331-a first ring gear; 332-a second ring gear; 333-fixed support; 3331-mounting holes; 3332-avoidance of vacancies; 34-a lower cover plate; 341-upper ring rib; 35-upper cover plate; 4-a support part; 5-a shock pad; 6-inner partition board; 61-bearing.

Detailed Description

In order to more clearly explain the overall concept of the present invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.

It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

As shown in fig. 1 to 7, the utility model provides a food processor with stable operation, which comprises a processing cup assembly 1 and a main machine 1 matched with the processing cup assembly, wherein the processing cup assembly 2 comprises a cup body 21, a cup cover 21 covering the open end of the cup body 21 and a processing piece 23 positioned in the cup body 21. The bottom of the main machine 1 is matched with the cup cover 21, the main machine 1 comprises two output ends with different rotating speeds, and the upper end of the workpiece 23 penetrates through the cup cover 21 to be connected with one of the output ends of the main machine to realize transmission. When the workpiece 23 realizes a slow processing function, such as dough mixing, egg breaking, etc., the workpiece 23 is a dough mixing knife or an egg breaking tray, and the workpiece 23 is connected to the output end of the low-speed main machine; when the workpiece 23 performs a high-speed processing function such as meat grinding, crushing, etc., the workpiece 23 is a meat grinding cutter or a crushing cutter, and the workpiece 23 is connected to a high-speed main machine output terminal.

Specifically, as shown in fig. 1 to 4, the main machine 1 includes a casing 11, a motor 12 located in the casing 11, and a reduction gearbox structure 3 provided with a planetary gear set, where the planetary gear set includes a first-stage planetary gear set 31 and a second-stage planetary gear set 32. The first-stage planetary gear set 31 comprises a first-stage sun gear 314 connected with the output end of the motor 12, a first-stage planetary gear 312 meshed with the first-stage sun gear 314, a first-stage planetary gear lower support 313 located below the first-stage planetary gear 312, and a high-speed output end located below the first-stage planetary gear lower support 313. The second-stage planetary gear set comprises a second-stage sun gear 324 connected below the first-stage planetary gear lower support 313, a second-stage planetary gear 322 meshed with the second-stage sun gear 324, and a second-stage planetary gear lower support 323 positioned below the second-stage planetary gear 322, and a low-speed output end is arranged below the second-stage planetary gear lower support 323. The casing 11 further includes a base 112 supporting and wrapping the reduction gearbox structure 3, and an upper cover 111 fixed to the base 112. The reduction gearbox structure 3 comprises a gear ring 33 which surrounds the outer sides of the first-stage planetary gear set 31 and the second-stage planetary gear set 32, an upper cover plate 35 which covers an upper opening of the gear ring 33, and a lower cover plate 34 which is positioned below the gear ring 33.

In the embodiment of the present application, the gear ring 33 includes a first gear ring 331 and a second gear ring 332 that are fixedly connected, the first gear ring 331 and the second gear ring 332 that are fixedly connected are fixedly disposed at the bottom of the casing 11, the cup cover 21 is provided with a cavity 212 that accommodates the bottom of the casing 11, and at least the second-stage planet gear 322 sinks into the cavity 212.

In the present application, the ring gear 33 includes a first ring gear 331 and a second ring gear 332 that are fixedly connected. Compare current split type ring gear, first ring gear 331 and second ring gear 332 behind the fixed connection are better to the radial movement's of two-stage planetary gear set suppression effect, effectively guarantee the axiality of first order planetary gear set 31 and second level planetary gear set 32 to reduce the noise that the radial wear between the two-stage planetary gear set produced, guarantee good transmission output. That is to say, the first ring gear 331 and the second ring gear 332 which are fixedly connected realize the first path of righting protection and noise reduction for the two-stage planetary gear set, and provide the first path of guarantee for the operation stability of the whole machine.

Meanwhile, in order to reduce radial vibration of the two-stage planetary gear set and the ring gear 33 and improve the working stability of the two-stage planetary gear set, a first ring gear 331 and a second ring gear 332 which are fixedly connected are also fixedly arranged at the bottom of the casing 11. The first gear ring 331 and the second gear ring 332 are fixed to the casing 11, and the deflection or shaking of the entire reduction gear box structure 3 inside the casing 11 is suppressed, including the axial play and radial deflection of the two-stage planetary gear set. That is to say, the reduction gearbox structure 3 can not collide with the casing 11 relatively, so that the deflection or shaking of the reduction gearbox structure 3 in the casing 11 is restrained, the noise generated by the collision of the reduction gearbox structure 11 and the casing is reduced, and the stability of each stage of output is improved. The fixation of the gear ring 33 and the casing 11 forms a second reinforced centering protection and noise reduction for the deflection of the two-stage planetary gear set, and a second guarantee is provided for the operation stability of the whole machine.

Meanwhile, on the premise that the reduction gearbox structure 3 is firmly fixed in the machine shell 11, compared with the existing host machine only comprising the planetary gear speed changing structure, the host machine comprising the two-stage planetary gear speed changing structure has the advantages of increased height and improved gravity center. Moreover, the presence of the second-stage planetary gear set 32 is a main factor that causes the height of the main machine 1 to be increased, the center of gravity to be raised, and noise to be increased. Therefore, this application is equipped with the cavity 212 of holding casing 11 bottom through setting up bowl cover 21, at least second level planet wheel 322 sinks in cavity 212 to let bowl cover 21's cavity 212 and host computer 1's coincidence height increase, offset the height of second level planet wheel 322 at least, thereby reduce host computer 1's casing and expose in the height of bowl cover 21, the focus of host computer 1 is more close to bowl cover 21, the focus of two-stage planet wheelset is in the high region of cavity 212. The center of gravity of the two-stage planetary gear set is within the height region of the cavity 212, so that the center of gravity of the reduction gear box structure 3 is also within the height region of the cavity 212. On the one hand, make bowl cover 21 parcel the main source that produces the noise, second level planet wheel assembly 32 to reduce the noise that host computer 1 itself produced. On the other hand, the gravity center of the reduction gearbox structure 3 is reduced, and the running stability of the host machine 1 is improved, so that the deflection noise of the host machine is reduced when the host machine 1 is matched with the cup cover 21. That is to say, the cavity 212 of the cup cover 21 forms a centering protection for the main machine 1, which is equivalent to that the cavity 212 indirectly forms a third centering protection and noise reduction for the two-stage planetary gear set, and provides a third guarantee for the operation stability of the whole machine.

Through three ways to two-stage planetary gear set from inside to outside right the protection and fall the noise, the effectual beat that has restrained reduction box structure 3's two-stage planetary gear set in the course of the work has promoted host computer 1 and bowl cover 21's cooperation stability, has promoted the axiality of two-stage planetary gear set to reduce host computer 1's noise at work, promote the stability of output, guarantee whole food preparation machine's operation stability. Therefore, according to the technical scheme, even when the dough kneading function with low rotating speed and high torque is performed, the two-stage planetary gear set can well keep the coaxiality, the eccentric vibration of the main machine caused by the eccentric pressing of the dough on one side is reduced, and the output stability is ensured.

It should be noted that in this embodiment, the arrangement that at least the second-stage planetary gear 322 sinks into the cavity 212 means that the upper surface of the second-stage planetary gear 322 is lower than or equal to the cavity 321. Preferably, when the second-stage planetary gear set 32 includes the second-stage planetary gear upper carrier 321 and the second-stage planetary gear lower carrier 323 that vertically clamp and fix the second-stage planetary gear 322, and the first-stage planetary gear set 31 includes the first-stage planetary gear upper carrier 311 and the first-stage planetary gear lower carrier 313 that vertically clamp and fix the first-stage planetary gear 312, the second-stage planetary gear 322 and the above portions may be located in the cavity 212, or only the second-stage planetary gear 322 may be located in the cavity 212. Of course, the second-stage planetary gear set 32 may also eliminate the second-stage planetary gear upper support 321, the first-stage planetary gear set 31 may also eliminate the first-stage planetary gear upper support 311, and both the second-stage planetary gear 322 and the above portions may be located in the cavity 212, or only the second-stage planetary gear 322 may be located in the cavity 212.

In the present application, the first gear ring 331 and the second gear ring 332 that are fixedly connected may be integrally formed with each other, or the first gear ring 331 and the second gear ring 332 may be fixed together by means of screws, ultrasonic welding, or the like. In addition, the first gear ring 331 and the second gear ring 332 that are fixedly connected in the present application are fixedly disposed at the bottom of the housing 11, which means that the first gear ring 331 and the second gear ring 332 are fixedly connected and then fixedly disposed at the bottom of the housing 11, and the fixing manner is not particularly limited. For example, the second ring gear or the second ring gear may be directly fixedly connected to the housing 11, or may be fixedly connected to the housing 11 by providing a fixing bracket on the ring gear 33.

In a preferred embodiment of the present application, as shown in fig. 1 to 3 and 5, the second-stage planetary gear set 32 further includes a second-stage sun gear 324 engaged with the second-stage planetary gear 322, and the engaged portion of the second-stage sun gear 324 and the second-stage planetary gear 322 is sunk into the concave cavity 212.

Since the second reduction is achieved by the second stage planetary gear set 32, the resulting rotational speed is low but the torque is high, and the noise generated by the meshing engagement between the second stage planetary gears 322 and the second stage sun gear 324 is greater. Therefore, the second-stage sun gear 324 and the meshing part of the second-stage planet gear 322 are arranged to be sunk in the concave cavity 212, so that the meshing part generating noise is wrapped in the concave cavity 212, the working noise of the second-stage planet gear set is blocked, and the noise reduction effect is achieved. In addition, the center of gravity of the meshing part of the second-stage sun gear 324 and the second-stage planet gear 322 is lowered, so that the meshing transmission of the second-stage sun gear 324 and the second-stage planet gear 322 is more stable, and the stable output of the low-speed output end is ensured. Of course, the entire second stage sun gear 324 may be recessed within the cavity 212.

In a preferred embodiment of the present application, for the food processor to be used for low speed and high torque functions such as dough mixing, the wear on the second stage planetary gear set 32 is reduced, and the reference circle diameter of each size of the second stage planetary gear 322 is set larger than the reference circle diameter of each gear of the first stage planetary gear 312, so that the diameter of the second ring gear 332 is larger than the diameter of the first ring gear 331, and the second ring gear can bear a larger load.

In a preferred embodiment of the present invention, as shown in fig. 1 to 6, a fixing bracket 333 is protruded radially outward from the ring gear 33, the ring gear 33 is fixedly connected to the base 112 of the housing 11 by the fixing bracket 333, and the cavity 212 at least covers the fixing bracket 333 in height.

In order to not damage the stability of the matching of the gear ring 33 and the two-stage planetary gear set and realize the fixed connection of the gear ring 33 and the casing 11, the reduction gearbox structure 3 also comprises an upper cover plate 35 which is covered above the gear ring 33, and a fixed bracket 333 is arranged on the gear ring 33 or the upper cover plate 35 in a protruding mode along the radial direction. Since the main factor of the weight increase of the main body 1 is the reduction gearbox structure 3, the higher the relative position of the reduction gearbox structure 3 in the machine shell 11 is, the higher the center of gravity of the main body 1 is, and the greater the possibility of the main body 1 swinging in the operation process is. For this purpose, the ring gear 33 is fixedly connected to the base 112 of the housing 11 via a fixing bracket 333, so as to fix the reduction gearbox assembly 3 to the base. Therefore, on one hand, the gravity center of the main machine 1 is reduced, and the axial movement of the planetary gear set is restrained to reduce noise; on the other hand, the two-stage planetary gear set is centered, and the coaxiality between the first-stage planetary gear set 31 and the second-stage planetary gear set 32 is ensured, so that the running and output stability of the main engine 1 is ensured.

Meanwhile, on the premise that the reduction gearbox structure 3 is firmly fixed in the casing 11, the cavity 212 is arranged to at least wrap the fixing support 333 in height, so that the height of the matching part of the cavity 212 of the cup cover 21 and the main machine 1 is increased, and the height of the second-stage planetary gear set 32 is at least offset. When the fixed carrier 333 is located on the upper cover plate 35, both the first-stage planetary gear set 31 and the second-stage planetary gear set 32 are located within the height region of the cavity 212; when the fixed carrier 222 is located on the ring gear 33, at least the second-stage planetary gear set 32 is ensured to be located within the height area of the cavity 212. The two modes effectively reduce the height of the part of the main machine 1 exposed out of the cup cover 21, so that the gravity center of the main machine 1 is closer to the cup cover 21, and the deflection of the main machine 1 when being matched with the cup cover 21 is reduced. In this way, the fixed height of the ring gear 33 with respect to the base 212 is close to the centre of gravity of the gearbox arrangement 3, i.e. the fixed carrier 33 is close to the centre of gravity of the gearbox arrangement 3, thereby improving the operational stability of the two-stage planetary gear set.

It is understood that when the fixing bracket 333 is located on the upper cover plate 35, the fixing bracket 333 may be the upper cover plate 35 itself. Meanwhile, the fixed connection mode between the fixed support and the upper cover plate is not particularly limited. Of course, the fixed bracket may also be located on the lower cover plate 34 below the ring gear 33.

It can also be understood that, on the premise that the first gear ring 331 and the second gear ring 332 are fixedly connected, the radial dimension of the second gear ring 332 is set to be larger than the radial dimension of the protected first gear ring 331, so that the side wall of the second gear ring 332 is directly fixedly connected with the base 112 of the casing without a fixing bracket. By the arrangement, the whole gear ring is small at the top and large at the bottom, the gravity center of the whole reduction gearbox structure is reduced, and the two-stage planetary gear sets are more difficult to deflect; on the other hand, a fixed bracket is not required to be arranged on the gear ring, and the fixed installation mode of the gear ring 33 and the base 112 is simplified.

In a preferred embodiment of the present application, as shown in fig. 5 and 6, a fixing bracket 333 is provided at a connection portion of the first ring gear 331 and the second ring gear 332, and the first ring gear 331, the second ring gear 332, and the fixing bracket 333 are integrally formed.

By providing the fixed bracket 333 at the junction of the first ring gear 331 and the second ring gear 332, the center of the fixed bracket 333 is brought closer to the center of gravity of the ring gear 33, so that the yawing of the ring gear 33 is reduced, and the first ring gear 331 and the second ring gear 332 are distributed evenly. Meanwhile, the first gear ring 331, the second gear ring 332 and the fixed support 333 are integrally formed, so that on one hand, the radial limiting of the gear ring 33 on the two-stage planetary gear set is favorably ensured, and the coaxiality and the output stability of the two-stage planetary gear set are ensured; on the other hand, the fixing bracket 333 is integrally formed on the ring gear 33, which not only simplifies the processing technology, but also ensures that the limit of the ring gear 33 and the two-stage planetary gear set in the ring gear 33 is more reliable when the fixing bracket 333 is fixedly arranged with the base 112 of the casing 11.

It is understood that, in another embodiment, the fixing bracket 333 may be integrally formed with the second gear ring 332, and the first gear ring 331 is fixed to the fixing bracket 333 by a fixing member or ultrasonic welding; alternatively, the fixed bracket 333 is integrally formed with the first ring gear 332, and the second ring gear 332 is fixed to the fixed bracket 333 by a fixing member or ultrasonic welding.

Further, in a preferred embodiment of the present application, as shown in fig. 4 to 7, the fixing bracket 333 is a plate-shaped structure, at least two mounting holes 3331 are formed on the plate-shaped structure, first fixing columns 1122 installed in one-to-one matching manner with the mounting holes 3331 are formed in the base 112, and the mounting holes 3331 and the first fixing columns 1122 are fastened by fixing members.

The fixed position is provided on the fixed carrier 333 in order not to destroy the integrity of the ring gear 33 nor affect the meshing of the ring gear 33 with the two-stage planetary gear set. By providing the fixing bracket 333 with a plate-like structure, the machining of the mounting hole 3331 is facilitated. Through set up first fixed column 1122 on the base, the mounting hole 3331 on first fixed column 1122 and the fixed bolster 333 cooperates one by one to fasten fixed bolster 333 and mounting hole 3331 through the mounting and fix with the realization platelike structure and base 112, thereby indirectly realize the fixed of ring gear 33 and base 112, guarantee the job stabilization nature of two-stage planetary gear set.

Preferably, the fixing member is a screw, and the screw passes through the mounting hole 3331 from top to bottom and is inserted into the first fixing column, so as to fasten the fixing bracket 333 to the base 112, and further fix the entire reduction gearbox structure 3 to the base 112. In order to further improve the stability of the connection of the fixing bracket and the base and the vibration between the fixing bracket and the base, a flexible shock absorption pad 5 is further arranged on the mounting hole 3331.

Further, in a preferred embodiment of the present invention, as shown in fig. 6 and 7, a second fixing column 1123 extending upward is disposed on the bottom cover 112 of the casing 11, a clearance 3332 is disposed on the fixing bracket 333, the clearance 3332 is disposed to avoid the mounting hole 3331, and the second fixing column 1123 is inserted into the clearance 3332 to realize circumferential rotation positioning of the ring gear 333.

In order to limit the circumferential rotation of the gear ring 33 and influence the stability of the speed reduction output of the reduction gearbox structure 3, the bottom cover 112 of the casing 11 is further provided with a second fixing column 1123 extending upwards, the fixing support 333 is provided with a clearance position 3332, and the second fixing column 1123 is inserted into the clearance position 3332 to realize the circumferential rotation positioning of the gear ring 33, so that the static state of the gear ring 33 is guaranteed, but the rotation of the two-stage planetary wheel set is realized, and the precision of the two-stage output is improved.

Meanwhile, a screw post 1111 installed in cooperation with the second fixing post 1123 is disposed on the upper cover 111 of the casing 11. The fixed installation of the bottom cover 112 and the upper cover 111 is realized by connecting the second fixing column 1123 with the screw column 1111 through the clearance 3332 from bottom to top.

In a preferred embodiment of the present application, as shown in fig. 1 and 2, the cavity 212 has a width L, the height H of the portion of the planetary gear set located inside said cavity 212, and the ratio of H to L ranges from 0.15 to 0.80.

Since the wider the width L of the cavity 212, the wider the bottom of the casing 11 fitted into the cavity 212, and the wider the radial width of the second-stage planetary gear set 32 of the reduction gear case structure 3, the center of gravity of the main body 1 is lowered to fall more easily into the area of the cavity 212. When only the second-stage planetary gear set 212 is located in the concave cavity, the height value H of the portion of the planetary gear set located in the concave cavity 212 is equivalent to the height of the second-stage planetary gear set 32; when the two-stage planetary gear sets are both located in the cavities, the H value corresponds to the total height of the two-stage planetary gear sets, i.e., the sum of the heights of the first-stage planetary gear set 31 and the second-stage planetary gear set 32. In contrast, the latter has a larger H value and the center of gravity of the main body 1 is lower. However, there is a correlation between the L value and the H value: if the value of H/L is less than 0.15, this may result in the width of the cavity 212 being too wide and the height at which the planetary gear set fits within the cavity 212 being too low. At this time, on the one hand, it is difficult to stably insert the host 1 into the cavity 212; on the other hand, the main unit 1 is too wide, which affects the appearance of the main unit 1. If the value of H/L is greater than 0.80, the width of the cavity 212 is too narrow, the planetary gear set becomes slender, the lowering effect on the center of gravity of the main unit 1 is not significant, and the increase in the depth of the cavity 212 also causes the overlap between the lid 21 and the cup 22 to increase, thereby decreasing the usable volume of the cup 22.

Therefore, the ratio range of H to L is set to be between 0.15 and 0.80, namely H/L is more than or equal to 0.15 and less than or equal to 0.80, so that the gravity center of the host 1 is favorably lowered, and the gravity center of the reduction gearbox structure 3 is particularly ensured to be positioned in the area of the concave cavity 212, so that the bottom of the machine shell 11 is more stably matched with the concave cavity 212; without making the cavity 212 too wide and thus the bottom of the housing 11 too wide, thereby affecting the aesthetic appearance of the host 1.

Further, when only the second-stage planetary gear set 32 is located in the height region of the cavity 212 and the two-stage planetary gear sets exhibit small top and large bottom, the value of H/L is preferably between 0.15 and 0.35. Thus, the pitch diameter of the second stage planet 322 is greater than the pitch diameter of the first stage planet 312, the diameter of the second annulus 332 is greater than the diameter of the first annulus 331, and the larger diameter second annulus 332 can carry larger loads, so L to be larger and H to be smaller, and H/L is preferably between 0.15 and 0.35. Similarly, when the first-stage planetary gear set 31 and the second-stage planetary gear set 32 are both located in the height region of the cavity 212 and the two-stage planetary gear sets exhibit small top and large bottom, the value of H/L is preferably between 0.25 and 0.50. In addition, when only the second-stage planetary gear set 32 is located in the height area of the cavity 212 but the widths of the two-stage planetary gear sets are consistent up and down, the center of gravity of the entire reduction gearbox structure 3 is located at the junction of the first-stage planetary gear set 31 and the second-stage planetary gear set 32, and then the value of H/L is preferably between 0.25 and 0.55 in order to ensure the stability of the entire reduction gearbox structure 3. Similarly, when the first stage planetary gear set 31 and the second stage planetary gear set 32 are both located within the height region of the cavity 212 but the widths of the two stage planetary gear sets are uniform, the value of H/L is preferably between 0.35 and 0.80.

It should be noted that when the sidewall of the cavity 212 is slightly inclined, the width of the bit line height in the cavity is set as L; when the cavity 212 has a uniform width, the width of any height can be used as the value of L.

In a preferred embodiment of the present application, as shown in fig. 2, the cup cover 21 further includes an annular protrusion 211 forming the cavity 212, the annular protrusion 211 is of a sealed cavity structure, the housing 11 includes a base 112 fixing a fixing bracket 333, a height of an upper surface of the second-stage planetary gear set 32 from a bottom surface of the base 112 is H1, a height of the base 112 is H2, a height of the annular protrusion 211 is H3, and H3 > H2 > H1. The height H1 is the plumb distance between the upper surface of the second-stage planet upper support 321 identified in fig. 2 and the inner bottom surface of the base 112, and the value H2 is the height of the side wall of the base 112.

It should be noted that, when the second-stage planetary gear set 32 includes the second-stage planetary gear upper carrier 321 and the second-stage planetary gear lower carrier 323, the determination of the H1 refers to the height of the upper surface of the second-stage planetary gear upper carrier 321 from the bottom surface of the base 112. When the second-stage planetary gear set 32 is free of the second-stage planetary gear upper carrier 321, the H1 value refers to the height of the second-stage planetary gear 322 from the bottom surface of the base 112.

The height H2 of the base 112 is set to be greater than the height H1 of the upper surface of the second-stage planetary gear set 32 from the bottom surface of the base 112, namely H2 > H1, so that the base 112 forms a first layer of barrier to noise generated by the second-stage planetary gear set 32. Meanwhile, the height H3 of the annular convex part 211 is larger than the height H2 of the base 112, that is, H3 is greater than H2, so that the height of the base 112 is accommodated in the concave cavity 212 of the cup cover 21, the second-stage planetary gear set 32 and the base 112 are completely accommodated in the concave cavity 212, and the annular convex part 211 centralizes the base 112, so that the second-stage planetary gear set 32 is indirectly centralized, the deflection of the second-stage planetary gear set 32 is prevented, and the stability of the main engine 1 on the cup cover 21 is improved. Furthermore, by arranging the annular convex part 211 to be a sealed cavity structure, the height H3 of the annular convex part 211 is larger than the height H1 of the upper surface of the second-stage planetary gear set 32 from the bottom surface of the base 112, namely H3 is larger than H1, so that the sound source generating noise, especially the second-stage planetary gear set 32, is effectively wrapped by the sealed annular convex part 211, and when the sound wave is diffused outwards to the annular convex part 211, the sealed annular convex part 211 generates reverse sound wave to neutralize the noise, thereby reducing the working noise of the food processor and effectively improving the use experience of a user.

In some preferred embodiments of the present invention, as shown in fig. 2, 4 and 7, an inner partition plate 6 extending radially inward is provided in the ring gear 33, the inner partition plate 6 divides the inner cavity of the ring gear 33 into a first cavity accommodating the first stage planetary gear set 31, and a second cavity accommodating the second stage planetary gear set 32, the first stage planetary gear set 31 is installed in the first cavity from top to bottom, and the second stage planetary gear set 32 is installed in the second cavity from bottom to top.

By providing the inner partition 6 extending radially inward in the ring gear 33, the inner partition 6 partitions the inner cavity of the ring gear 33 into a first cavity accommodating the first-stage planetary gear set 31 and a second cavity accommodating the second-stage planetary gear set 32, so that the first-stage planetary gear set 31 and the second-stage planetary gear set 32 at different speeds are not worn, thereby reducing the noise of operation. In addition, no wear occurs, and there is no relative friction between the lower surface of the first-stage planetary gear set 31 and the upper surface of the second-stage planetary gear set 32, thereby reducing the error of the output speed. Simultaneously, still through setting up first order planetary gear set 31 is from last down installing in first cavity, and second level planetary gear set 32 is from up installing in the second cavity down, compares like this that the two-stage planetary gear set is all from up the mode of installing down, and the degree of depth of installation is shallower, more convenient, also can not interfere between two-stage planetary gear sets. Preferably, the radial width of the first cavity is smaller than that of the second cavity, so that the whole gear ring is in a shape with a small top and a big bottom, and the stability is higher.

Further, as shown in fig. 7, in order to further improve the coaxiality of the two-stage planetary gear set, an annular bearing 61 is further disposed in the through hole of the inner partition plate 6, and the annular bearing 61 is used for radially limiting the output end of the first-stage planetary gear set 31, so as to ensure that the second-stage sun gear 324 is accurately inserted into the middle of the second-stage planetary gear 322 and meshed with the second-stage planetary gear 322. The preferred inner partition 6, first ring gear 331, and second ring gear 332 are integrally formed. More preferably, the inner partition 6, the first gear ring 331, the second gear ring 332, and the fixing bracket 333 are integrally formed.

It is understood that the inner partition plate 6 may be eliminated on the basis of the integral molding of the inner partition plate 6, the first ring gear 331 and the second ring gear 332, and the first-stage planetary gear set 31 and the second-stage planetary gear set 32 share the ring gear 33, but the form of the ring gear 33 is not limited. This approach, while improving the coaxiality of the two-stage planetary gear set, is somewhat inferior to the previous embodiment in preventing axial play and interference of the two-stage planetary gear set.

It will also be appreciated that the inner partition 6 may also be provided on one of the first and second ring gears 331, 332, the remaining ring gears being fixedly connected to the inner partition 6. The coaxiality of the scheme is slightly lower than that of the scheme that the inner partition plate 6, the first gear ring 331 and the second gear ring 332 are integrally formed, but the rotating speed of the first-stage planetary gear set is high, and the first-stage planetary gear set 31 and the second-stage planetary gear set 32 can be made of different materials because the second-stage planetary gear set 32 does not have special temperature requirements; of course, the first gear ring 331 and the second gear ring 332 may be made of different materials.

Further, in some preferred embodiments of the present application, as shown in fig. 2 to 4 and fig. 6, the reduction gearbox structure 3 further includes a bottom cover plate 34 located at the lower end of the gear ring 33, a support portion 4 for limiting the inclination of the bottom cover plate 34 is disposed on the base 112 of the casing 11, the support portion 4 is located below the bottom cover plate 34, the support portion 4 is disposed away from the center of the bottom cover plate 34, an upper ring rib 341 is disposed on the lower surface of the bottom cover plate 34, and a lower ring rib 1121 which is mutually inserted and matched with the upper ring rib 341 is disposed on the inner bottom surface of the base 112 of the casing 11.

In order to prevent the deflection of the reduction gearbox structure 3 from affecting the stability of output, a support part 4 for limiting the inclination of the bottom cover plate 34 is also arranged on the base 112, and the support part 4 is positioned below the bottom cover plate 34. When the two-stage planetary gear set deflects to drive the gear ring 33 to deflect, the bottom cover plate 34 connected with the gear ring 33 also deflects. At this time, the supporting portion 4 located below the bottom cover plate 34 abuts against the bottom cover plate 34 and assists the bottom cover plate 34 to return to the vertical direction, so that the ring gear 33 and the two-stage planetary gear set are driven to return to the normal direction. Meanwhile, in order to improve the aligning effect of the supporting portion 4, the supporting portion 4 is further disposed away from the center of the bottom cover plate 34. Thus, the moment arm of the support portion 4 increases and the force required to straighten the ring gear 33 by the support portion 4 decreases. Not only can effectively improve the righting effect, but also can avoid causing the abrasion of the bottom cover plate 34 to the supporting part 4.

In order to further reduce the radial runout of the reduction gearbox structure 3, an upper ring rib 341 provided on the lower surface of the bottom cover plate 34 and a lower ring rib 1121 provided on the inner bottom surface of the base 112 are inserted into each other to suppress the radial runout of the ring gear 33. And the ring gear 33 is enclosed outside the two-stage planetary gear set, so that the radial deflection of the two-stage planetary gear set is indirectly inhibited, and the coaxiality of the two-stage planetary gear set and the stability of each stage of output are further ensured. The stability is enhanced, so that the abrasion of the two-stage planetary gear set, the collision between the two-stage planetary gear set and the gear ring or the collision between the gear ring and the machine shell 11 are greatly reduced, and the noise generated by the work of the main machine is also reduced.

It is understood that, under another embodiment of the present application, the supporting portion 4 for limiting the inclination of the bottom cover plate 34 may be provided only on the base 112 of the casing 11, the supporting portion 4 is located below the bottom cover plate 34, and the supporting portion 4 is located away from the center of the bottom cover plate 34. In another embodiment of the present application, the upper ring rib 341 may be disposed only on the lower surface of the bottom cover 34, and the lower ring rib 1121, which is inserted into and engaged with the upper ring rib 341, is disposed on the inner bottom surface of the base 112 of the housing 11.

The technical solutions protected by the present invention are not limited to the above embodiments, and it should be noted that the combination of the technical solution of any one embodiment and the technical solution of one or more other embodiments is within the protection scope of the present invention. Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.

Claims (10)

1. The utility model provides a food preparation machine that operation is stable, includes the bowl cover and with the host computer of bowl cover cooperation installation, the host computer includes the casing, is located the motor of casing and is equipped with the reducing gear box structure of planet wheelset, the planet wheelset includes first order planet wheelset and second level planet wheelset, the reducing gear box structure is including enclosing the ring gear of locating first order planet wheelset and second level planet wheelset outside, second level planet wheelset includes second level planet wheel, its characterized in that, the ring gear includes fixed connection's first ring gear and second ring gear, and fixed connection's first ring gear and second ring gear are fixed to be set up in the bottom of casing, be equipped with the holding on the bowl cover the cavity of chassis bottom, at least second level planet wheel sinks in the cavity.

2. The operationally stable food processor of claim 1, wherein the cavity has a width L, the portion of the planetary gear set within the cavity has a height H, and the ratio of H to L ranges from 0.15 to 0.80.

3. The operationally stable food processor of claim 1, wherein the second stage planetary gearset further comprises a second stage sun gear in meshing engagement with the second stage planet gears, the second stage sun gear being recessed within the cavity.

4. A stable food processor according to claim 1, wherein the reduction gearbox arrangement further comprises an upper cover plate covering the gear ring, wherein a fixing bracket is provided on the gear ring or the upper cover plate in a radially outwardly protruding manner, the gear ring is fixedly connected to the base of the housing by means of the fixing bracket, and the cavity at least covers the fixing bracket in height.

5. The food processor with stable operation as claimed in claim 4, wherein the fixing bracket is a plate-shaped structure, the plate-shaped structure is provided with at least two mounting holes, first fixing columns are arranged in the base and are matched with the mounting holes one by one, and the mounting holes and the first fixing columns are fastened through fixing pieces.

6. The food processor as claimed in claim 5, wherein the bottom cover of the housing has a second fixing post extending upward, the fixing bracket has a space avoiding portion disposed to avoid the mounting hole, and the second fixing post is inserted into the space avoiding portion to position the gear ring in a circumferential direction.

7. The food processor of claim 4, wherein the fixed bracket is disposed at a junction of the first ring gear and the second ring gear, and the first ring gear, the second ring gear, and the fixed bracket are integrally formed.

8. The food processor of claim 1, wherein the lid further includes an annular protrusion forming the cavity, the annular protrusion having a sealed cavity structure, the housing including a base to which the stationary bracket is secured, the upper surface of the second stage planetary gear set having a height H1 from the bottom surface of the base, the base having a height H2, the annular protrusion having a height H3, H3 > H2 > H1.

9. The food processor of claim 1, wherein the ring gear has an internal baffle extending radially inward, the internal baffle separating the internal cavity of the ring gear into a first cavity containing a first stage of planetary gear set and a second cavity containing a second stage of planetary gear set, the first stage of planetary gear set being mounted in the first cavity from top to bottom and the second stage of planetary gear set being mounted in the second cavity from bottom to top.

10. The food processor of claim 1, wherein the reduction gearbox structure further comprises a bottom cover plate located at the lower end of the gear ring, a support portion for limiting the inclination of the bottom cover plate is provided on the base of the housing, the support portion is located below the bottom cover plate, and the support portion is located away from the center of the bottom cover plate; and/or the lower surface of the bottom cover plate is provided with an upper annular rib, and the inner bottom surface of the base of the machine shell is provided with a lower annular rib which is mutually spliced and matched with the upper annular rib.

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