Refrigerator door push rod structure and refrigerator thereof

Abstract

The application relates to the technical field of refrigerators, in particular to a refrigerator door push rod structure and a refrigerator. The refrigerator door push rod drives a transmission gear set through a driving gear set to realize the extension or retraction of the push rod. A first gear and a second gear located in the first gear are arranged in the transmission gear set. The first gear is provided with a support rod supported in a groove on the outer circumferential side of the second gear. The groove is provided with an abrupt surface and a gradual surface. In the working condition of the extension of the push rod to open the refrigerator door under a large load, the support rod is in abutment with the abrupt surface. In the working condition of the retraction of the push rod under a small load, the support rod is in abutment with the gradual surface. After the push rod is retracted to the position, the driving gear set is continuously rotated to make the support rod slide into the next groove through the gradual surface, so that the gears in the transmission gear set are evenly matched, the number of times of engagement of each gear is evenly distributed, and the impact damage is reduced. The elastic member is arranged to ensure that the support rod is always in abutment with the groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerators, in particular to a refrigerator door push rod structure and a refrigerator thereof. BACKGROUND

[0002] With the improvement of people's living standards, refrigerators are also becoming more and more popular in daily life, and many refrigerators have realized the intelligent opening and closing of doors, which can automatically open and close the doors. At present, most of the automatic door opening and closing devices suitable for refrigerators have high requirements for thickness, and require very thin thickness to adapt to the originally narrow space of the refrigerator.

[0003] In view of this, a patent (Patent No. CN202322051909.7) has applied for an automatic door opening and closing device of a refrigerator, which realizes an ultra-thin automatic door opening and closing device of a refrigerator through the cooperation of gears and racks. In this patent, the first gear and the second gear are mutually transmitted, the first gear drives the second gear, and the second gear drives the push rod to extend or retract through the intermediate transmission mechanism. However, when the push rod works to the limit position, it is always the two teeth (defined as the first tooth and the second tooth) fixed on the first gear and the second gear that bear the impact force of the push rod suddenly stopping at the limit position, so the load borne by the first tooth and the second tooth is larger, which causes the two gears to break down faster, thereby affecting the service life of the entire device. Moreover, when the push rod extends, the first gear rotates clockwise, and when the push rod retracts, the first gear rotates counterclockwise. During the clockwise and counterclockwise rotation, not every time is a complete clockwise rotation or a complete counterclockwise rotation, so there will be some gears that experience one more meshing than the rest of the gears, and the gears that mesh one more time will have more wear than the other gears. SUMMARY

[0004] Based on this, the present application provides a refrigerator door push rod structure to solve the above technical problems.

[0005] The application discloses a refrigerator door push rod structure, which comprises a driving gear set connected with a driving source, a transmission gear set comprising coaxially arranged first, second and third gears, the first gear is engaged with the driving gear set, the first gear is provided with an opening, the second gear is located in the opening and connected with the inner wall of the opening of the first gear, the diameter of the second gear is smaller than that of the first gear, the third gear is connected to the axial side of the second gear and rotates synchronously with the second gear, a first gear rack connected with a push rod at one end, the push rod is connected with a refrigerator door, the first gear rack is engaged with the third gear, wherein the third gear comprises a plurality of support rods, the support rods are arranged along the inner wall of the opening in a circumferential direction, a plurality of grooves are arranged on the outer wall of the second gear in a circumferential direction, the groove wall comprises an abrupt surface and a gentle surface, the included angle between the abrupt surface and the support rod is larger than that between the gentle surface and the support rod, and each support rod is supported in the groove, when the driving gear set rotates in a first direction, the first gear can be driven to rotate in a second direction opposite to the first direction, the support rod is abutted against the abrupt surface of the groove, the second gear and the third gear are synchronously driven to rotate in the second direction, the first gear rack and the push rod are driven to extend, when the driving gear set rotates in the second direction, the first gear is driven to rotate in the first direction, the support rod is abutted against the gentle surface of the groove, the second gear and the third gear are synchronously driven to rotate in the first direction, the first gear rack and the push rod are driven to retract, and when the first gear rack moves to the limit position of retraction, the driving gear set continues to rotate until the support rod slides into the next groove along the first direction with the gentle surface.

[0006] The driving gear set is arranged to drive the third gear to rotate first by engaging with the third gear, and the third gear rotates synchronously with the second gear by engaging with the second gear, and the second gear drives the third gear to rotate synchronously, and the third gear drives the first rack to move in the length direction relative to the third gear by engaging with the first rack, and the push rod is connected with the first rack, so that the first rack drives the push rod to extend or retract when moving, and the refrigerator door connected with the push rod is automatically opened or closed. When the driving gear set rotates in the first direction, the first gear rotates in the second direction opposite to the first direction by engaging with the first gear, and drives the second gear and the third gear to rotate in the second direction. At this time, the push rod is extended to open the refrigerator door, so the load is relatively high, and the connection strength between the first gear and the second gear is also relatively high, so the support rod abuts against the steep surface of the groove during the extension of the push rod, the angle between the steep surface and the support rod is relatively large, so the abutting effect with the support rod is more stable, so although the load of the opening action is relatively large, the steep surface enables the support rod to stably drive the second gear to rotate, thereby ensuring the smooth performance of the opening action, and the problem of slipping teeth does not occur. When the refrigerator door needs to be closed, the push rod needs to be retracted, and the driving gear set is reversed (i.e., rotates in the second direction), and the rotating directions of the first gear, the second gear and the third gear are opposite to those described above. At this time, the support rod abuts against the gentle surface of the groove, and the angle between the gentle surface and the support rod is relatively small, and the abutting strength is not as good as that of the steep surface, but the load of the closing action is relatively small, so the stable clamping of the support rod and the groove can still be ensured, and the first gear drives the second gear to rotate to achieve the closing action. When the closing action is completed, the first rack and the push rod have been retracted to the limit position (the limit position refers to that the first rack and the push rod cannot be further retracted, and cannot produce any displacement in the retraction direction), at this time the third gear and the second gear are locked and cannot rotate further, and the driving gear set further rotates according to the preconfigured program to drive the first gear to further rotate, and the support rod of the first gear abuts against the gentle surface, and when the second gear cannot rotate, the support rod can further rotate in response to the continuous force of the driving gear set until it slides into the next groove along the first direction. In this way, when the refrigerator door is opened and closed next time, the groove abutted by the support rod is not the same as the last time, so the replacement of the gear at the limit position can be achieved for each side opening and closing, avoiding the problem that the same gear bears the load at the limit position each time the door is opened and closed, and the load on each gear is shared, so that the gears in the transmission gear set are evenly worn, the number of times of engagement of each gear is evenly distributed, and impact damage is reduced.

[0007] In one of the embodiments, the support rods are evenly spaced along the hollowed inner wall, and the number of the grooves is greater than the number of the support rods.

[0008] In one of the embodiments, the support rods are obliquely arranged relative to the radial direction of the first gear and obliquely extend into the grooves.

[0009] In one of the embodiments, the support rods have a first included angle and a second included angle with the hollowed inner wall, the first included angle is smaller than the second included angle, and the elastic member is arranged in the first included angle, and a part of the elastic member abuts against the support rod and another part of the elastic member abuts against the hollowed inner wall.

[0010] In one of the embodiments, the elastic member is arranged in a spring piece structure, the elastic member is bent to form a first section and a second section, the first section abuts against the support rod to form a side of the first included angle, the second section abuts against the hollowed inner wall, and the first section and the second section are arranged at the angle of the first included angle.

[0011] In one of the embodiments, a first protrusion is arranged on the side of the first included angle of the support rod, a first clamping groove is arranged on the first section, and the first protrusion is clamped in the first clamping groove.

[0012] A second protrusion is arranged on the hollowed inner wall, a second clamping groove is arranged on the second section, and the second protrusion is clamped in the second clamping groove.

[0013] In one of the embodiments, the refrigerator door push rod structure further comprises a housing, the first rack, the drive gear set and the transmission gear set are all installed in the housing, and the drive gear set is rotationally connected with the housing.

[0014] In one of the embodiments, the refrigerator door push rod structure further comprises a second rack and a guide gear, the second rack is connected with the housing and arranged in parallel with the first rack, and the guide gear is arranged between the first rack and the second rack and engaged with the first rack and the second rack.

[0015] In one of the embodiments, the drive gear set comprises a drive big gear and a drive small gear, the drive big gear is coaxially arranged with the drive small gear, the drive big gear is connected with a drive source, the drive small gear is connected with the drive big gear and rotates synchronously, and the drive small gear is engaged with the first gear.

[0016] A refrigerator comprises the refrigerator door push rod structure as described above.

[0017] Compared with the prior art, the present application drives the transmission gear set by the driving gear set to realize the extension or retraction of the push rod, the first gear and the second gear located in the first gear are arranged in the transmission gear set, the first gear has a support rod supported in the groove on the outer circumferential side of the second gear, the groove has an abrupt surface and a gentle surface, the support rod abuts against the abrupt surface under the condition of the extension of the push rod to open the refrigerator door under a large load, the support rod abuts against the gentle surface under the condition of the retraction of the push rod under a small load, and the driving gear set continues to rotate after the push rod is retracted to the position, so that the support rod slides into the next groove through the gentle surface, the gears in the transmission gear set are evenly worn, the number of engagement of each gear is evenly distributed, and the impact damage is reduced. The elastic member is arranged between the support rod and the inner wall of the first gear, so that the support rod always abuts against the groove, and the deformation of the support rod after long-term use does not affect the effect of driving the second gear to rotate. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 Structure diagram of one embodiment of the refrigerator door push rod structure provided by the present application;

[0019] Fig. 2 Structure diagram of another angle of one embodiment of the refrigerator door push rod structure provided by the present application;

[0020] Fig. 3 Partial structure diagram of one embodiment of the refrigerator door push rod structure provided by the present application.

[0021] The meanings of the symbols in the drawings are as follows:

[0022] 100, refrigerator door push rod structure; 10, driving gear set; 11, driving large tooth; 12, driving small tooth; 20, transmission gear set; 21, first gear; 211, support rod; 2111, first protrusion; 212, hollow; 2121, second protrusion; 213, elastic member; 2131, first section; 2132, second section; 2133, first clamping groove; 2134, second clamping groove; 214, first included angle; 215, second included angle; 22, second gear; 221, groove; 2211, abrupt surface; 2212, gentle surface; 23, third gear; 30, first rack; 31, push rod; 40, second rack; 41, guide gear; 50, shell. DETAILED DESCRIPTION

[0023] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the detailed description of the specific embodiments of the present application is made below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that the application is not limited in its application to the details set forth in the description below.

[0024] It should be noted that when a member is referred to as being "on" or "set on" another member, it can be directly on the other member or there can be an intervening member. When a member is referred to as being "connected" to another member, it can be directly connected to the other member or there can be an intervening member. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar terms as used in the description of the specification are for the purpose of illustration only and do not indicate an exclusive embodiment.

[0025] In addition, the terms "first", "second", and the like, do not denote any ontological relation or significance, but are used merely for the purpose of description.

[0026] In the present application, unless specifically stated and limited otherwise, the terms "on", "under", "above", and "below" can mean that the first member is in direct contact with the second member, or the first member is in indirect contact with the second member through an intervening medium. Also, the terms "on", "above", and "over" can mean that the first member is directly above or obliquely above the second member, or only means that the first member is horizontally higher than the second member. The terms "under", "below", and "underneath" can mean that the first member is directly below or obliquely below the second member, or only means that the first member is horizontally lower than the second member.

[0027] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0028] The application provides a refrigerator door push rod structure 100, which can replace the meshing teeth of the push rod 31 at the limit position during the repeated extension and retraction of the push rod 31, so that the wear of each gear in the transmission gear set 20 is balanced, the number of times of meshing of each gear is evenly distributed, and the impact damage is reduced.

[0029] Please see Figs. 1-3 The refrigerator door push rod structure 100 comprises a driving gear set 10, a transmission gear set 20 and a first rack 30. The driving gear set 10 is connected with a driving source and is driven and rotated by the driving source. The transmission gear set 20 comprises coaxially arranged first, second and third gears 21, 22 and 23. The first gear 21 is engaged with the driving gear set 10. The first gear 21 is provided with an opening 212. The second gear 22 is located in the opening 212 and connected with the inner wall of the opening 212 of the first gear 21. The diameter of the second gear 22 is smaller than that of the first gear 21. The third gear 23 is connected to the axial side of the second gear 22 and synchronously rotated with the second gear 22. The first rack 30 is connected with a push rod 31 at one end. The push rod 31 is used to connect with a refrigerator door. The first rack 30 is engaged with the third gear 23.

[0030] In this way, the driving gear set 10 drives the third gear 23 to rotate through the engagement with the third gear 23. The third gear 23 is synchronously rotated with the second gear 22 through the connection with the second gear 22. The third gear 23 is synchronously rotated with the second gear 22 through the second gear 22. Since the third gear 23 is engaged with the first rack 30, the third gear 23 can make the first rack 30 move in the length direction relative to the third gear 23 while rotating. Since the push rod 31 is connected with the first rack 30, the first rack 30 can drive the push rod 31 to extend or retract while moving, thereby automatically opening or closing the refrigerator door connected with the push rod 31.

[0031] The third gear 23 comprises a plurality of support rods 211, which are arranged circumferentially along the inner wall of the hollow 212. The outer circumferential wall of the second gear 22 is provided with a plurality of grooves 221 circumferentially. The groove wall of the groove 221 comprises an abrupt surface 2211 and a gradual surface 2212. The angle between the abrupt surface 2211 and the support rod 211 is greater than the angle between the gradual surface 2212 and the support rod 211. Each support rod 211 is supported in the groove 221. When the driving gear set 10 rotates in the first direction, the first gear 21 is driven to rotate in the second direction opposite to the first direction, the support rod 211 abuts against the abrupt surface 2211 of the groove 221, and the second gear 22 and the third gear 23 are simultaneously driven to rotate in the second direction, so as to drive the first rack 30 and the push rod 31 to extend. When the driving gear set 10 rotates in the second direction, the first gear 21 is driven to rotate in the first direction, the support rod 211 abuts against the gradual surface 2212 of the groove 221, and the second gear 22 and the third gear 23 are simultaneously driven to rotate in the first direction, so as to drive the first rack 30 and the push rod 31 to retract. When the first rack 30 moves to the limit position of retraction, the driving gear set 10 continues to rotate until the support rod 211 slides into the next groove 221 along the first direction with the gradual surface 2212.

[0032] Thus, when the driving gear set 10 rotates in the first direction, the first gear 21 rotates in the second direction due to the engagement relationship between the driving gear set 10 and the first gear 21, and the second gear 22 and the third gear 23 are driven to rotate in the second direction. At this time, since the extension of the push rod 31 is the action of opening the refrigerator door, the load is relatively high, and the connection strength between the first gear 21 and the second gear 22 is also relatively high. Therefore, during the extension of the push rod 31, the support rod 211 abuts against the steep surface 2211 of the groove 221, and the angle between the support rod 211 and the steep surface 2211 is relatively large, so that the abutting effect between the support rod 211 and the steep surface 2211 is more stable. Therefore, although the load of the opening action is relatively large, the steep surface 2211 enables the support rod 211 to stably drive the second gear 22 to rotate, thereby ensuring the smooth performance of the opening action and avoiding problems such as gear slipping. When the refrigerator door needs to be closed, the push rod 31 needs to be retracted, and the driving gear set 10 is reversed (i.e., rotates in the second direction). At this time, the rotating directions of the first gear 21, the second gear 22, and the third gear 23 are opposite to those described above. At this time, the support rod 211 abuts against the gentle surface 2212 of the groove 221, and the angle between the support rod 211 and the gentle surface 2212 is relatively small, so that the abutting strength is not as good as that of the steep surface 2211. However, since the load of the closing action is relatively small, the stable clamping of the support rod 211 and the groove 221 can still be ensured, and the first gear 21 drives the second gear 22 to rotate to achieve the closing action. When the closing action is completed, the first rack 30 and the push rod 31 have been retracted to the limit position (the limit position refers to the position where the first rack 30 and the push rod 31 cannot be further retracted and cannot produce any displacement in the retraction direction), and the third gear 23 and the second gear 22 are locked and cannot be further rotated. The driving gear set 10 further rotates according to the preconfigured program, and the first gear 21 is further driven to rotate. Since the support rod 211 of the first gear 21 abuts against the gentle surface 2212, when the second gear 22 cannot rotate, the support rod 211 can further rotate in response to the continuous force of the driving gear set 10 until it slides into the next groove 221 along the first direction. In this way, when the refrigerator door is opened and closed next time, the groove 221 abutted by the support rod 211 is not the same as the groove 221 abutted last time. Therefore, the replacement of the gears at the limit position can be achieved for each opening and closing, and the problem that the same gear bears the load at the limit position of each opening and closing is avoided. The load on each gear is evenly distributed, the gears in the transmission gear set 20 are evenly worn, the number of times of engagement of each gear is evenly distributed, and the impact damage is reduced.

[0033] It needs to be explained that the angle between the above-mentioned steep surface 2211 and the supporting rod 211 refers to the angle formed between the plane where the surface of the steep surface 2211 is located and the extension direction of the supporting rod 211, that is, the length direction. Preferably, in the present embodiment, the angle between the supporting rod 211 and the steep surface 2211 needs to be greater than 60° to ensure stable abutment, and the angle between the slow surface 2212 and the supporting rod 211 needs to be less than 30° to enable the supporting rod 211 to smoothly slide into the next groove 221.

[0034] In the present embodiment, the first direction is counterclockwise, and the second direction is clockwise, that is, when the driving gear set 10 rotates counterclockwise, it can drive the first gear 21 to rotate clockwise, thereby driving the second gear 22 and the third gear 33 to rotate along the clockwise direction, so as to make the first rack 30 extend.

[0035] Further, the supporting rods 211 are uniformly spaced along the inner wall of the hollow 212, and the number of grooves 221 is greater than the number of supporting rods 211. The uniform arrangement of the supporting rods 211 makes the driving effect of the first gear 21 on the second gear 22 more uniform, and the second gear 22 is balanced in force. And the number of grooves 221 is greater than the number of supporting rods 211, which can ensure that each supporting rod 211 can smoothly slide into the next tooth.

[0036] In other embodiments, the number of grooves 221 can be twice or more than the number of supporting rods 211, so as to further evenly distribute and reduce the limit position load received by each groove 221, thereby prolonging the service life of the device.

[0037] The supporting rod 211 is arranged obliquely relative to the radial direction of the first gear 21 and obliquely extends into the groove 221. In this way, together with the arrangement of the steep surface 2211 and the slow surface 2212, it is convenient for the supporting rod 211 to slide into the next groove 221, and the force of the supporting rod 211 can be sequentially along its length direction, so that it can bear higher load and avoid breaking of the supporting rod 211.

[0038] The supporting rod 211 and the inner wall surface of the hollow 212 have a first angle 214 and a second angle 215, the angle of the first angle 214 is smaller than that of the second angle 215, and the first angle 214 is provided with an elastic member 213, part of the elastic member 213 abuts against the supporting rod 211, and the other part abuts against the inner wall of the hollow 212. The elastic member 213 can provide a thrust to the supporting rod 211, so as to ensure that the supporting rod 211 always abuts in the groove 221, and avoid deformation after long-term use, which makes it difficult to continue to stably engage with the groove 221.

[0039] Further, the elastic member 213 is provided in a spring structure, the elastic member 213 is formed by bending into a first segment 2131 and a second segment 2132, the first segment 2131 abuts against the support rod 211 to form a side surface of the first included angle 214, the second segment 2132 abuts against the inner wall of the hollow 212, and the first segment 2131 and the second segment 2132 are arranged at the angle of the first included angle 214. In this way, the spring structure is simple, and the sheet structure and the adaptation to the first included angle 214 make the contact area of the first segment 2131 with the support rod 211 larger, and the contact area of the second segment 2132 with the inner wall of the hollow 212 also larger, thereby ensuring stable installation of the spring.

[0040] Understandably, in other embodiments, the elastic member 213 can also be provided in a spring structure, one end of the spring abuts against the support rod 211, and the other end abuts against the inner wall of the hollow 212, which can also achieve the technical effects.

[0041] The side surface of the support rod 211 forming the first included angle 214 is provided with a first protrusion 2111, the first segment 2131 is provided with a first clamping groove 2133, and the first protrusion 2111 is clamped in the first clamping groove 2133; the inner wall of the hollow 212 is provided with a second protrusion 2121, the second segment 2132 is provided with a second clamping groove 2134, and the second protrusion 2121 is clamped in the second clamping groove 2134. In this way, the installation stability of the elastic member 213 is further improved.

[0042] In other embodiments, the elastic member 213 can also be directly welded or bonded with the first gear 21, and is not limited to the clamping structure of the protrusion and the groove 221.

[0043] The refrigerator door push rod structure 100 further comprises a housing 50, the first rack 30, the drive gear set 10 and the transmission gear set 20 are all installed in the housing 50, and the drive gear set 10 is rotationally connected with the housing 50. In this way, the housing 50 can carry, fix and protect the internal elements of the housing 50, so that the device is less affected by the external environment.

[0044] In other embodiments, the first rack 30, the drive gear set 10 and the transmission gear set 20 can also be directly installed in the refrigerator, thereby reducing the volume occupation and cost of the housing 50.

[0045] The refrigerator door push rod structure 100 further comprises a second rack 40 and a guide gear 41, the second rack 40 is connected with the housing 50 and is arranged in parallel with the first rack 30, and the guide gear 41 is arranged between the first rack 30 and the second rack 40 and is engaged with the first rack 30 and the second rack 40.

[0046] Therefore, the second rack 40 is fixed in position, so the guide gear 41 can further guide the movement of the first rack 30 based on the second gear 22, the first rack 30 is not only engaged by the third gear 23 but also engaged and guided by the guide gear 41 during the movement, so that the movement of the first rack 30 and the push rod 31 is more stable, and the shaking is reduced.

[0047] The drive gear set 10 comprises a drive big gear 11 and a drive small gear 12, the drive big gear 11 is coaxially arranged with the drive small gear 12, the drive big gear 11 is connected with a driving source, the drive small gear 12 is connected with the drive big gear 11 and rotates synchronously, and the drive small gear 12 is engaged with the first gear 21.

[0048] The application also provides a refrigerator comprising the refrigerator door push rod structure 100.

[0049] Compared with the prior art, the application drives the transmission gear set 20 through the drive gear set 10 to realize the extension or retraction of the push rod 31, the first gear 21 and the second gear 22 located in the first gear 21 are arranged in the transmission gear set 20, the first gear 21 has a support rod 211 supported in a groove 221 on the outer circumferential side of the second gear 22, the groove 221 has an abrupt face 2211 and a gradual face 2212, the support rod 211 is in abutment with the abrupt face 2211 under the condition of the large load of the extension of the push rod 31 to open the refrigerator door, the support rod 211 is in abutment with the gradual face 2212 under the condition of the small load of the retraction of the push rod 31, and the drive gear set 10 continues to rotate after the push rod 31 is retracted to the position, so that the support rod 211 slides into the next groove 221 through the gradual face 2212, the gears in the transmission gear set 20 are evenly worn, the number of times of engagement of each gear is evenly distributed, and the impact damage is reduced. The elastic member 213 is arranged between the support rod 211 and the inner wall of the first gear 21, so that the support rod 211 is always in abutment with the groove 221, and the deformation of the support rod 211 after long-time use does not affect the effect of driving the second gear 22 to rotate.

[0050] The technical features of the above-described embodiments can be combined arbitrarily, and for the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0051] The above-described embodiments only express several implementation manners of the application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A refrigerator door push rod structure, characterized in that, include: A drive gear set (10) is used to connect to a drive source; The transmission gear set (20) includes a first gear (21), a second gear (22) and a third gear (23) arranged coaxially. The first gear (21) meshes with the drive gear set (10). The first gear (21) has a hollow (212) in it. The second gear (22) is located in the hollow (212) and is connected to the first gear (21) to form the inner wall of the hollow (212). The diameter of the second gear (22) is smaller than the diameter of the first gear (21). The third gear (23) is connected to the axial side of the second gear (22) and rotates synchronously with the second gear (22). The first rack (30) has a push rod (31) connected to one end. The push rod (31) is used to connect with the refrigerator door. The first rack (30) meshes with the third gear (23). The third gear (23) includes multiple support rods (211), which are arranged circumferentially along the inner wall of the hollow (212). The outer wall of the second gear (22) has multiple grooves (221) circumferentially formed. The groove wall of the groove (221) includes a steep surface (2211) and a gentle surface (2212). The angle between the steep surface (2211) and the support rod (211) is greater than the angle between the gentle surface (2212) and the support rod (211). Each support rod (211) is supported in the groove (221). When the drive gear set (10) rotates along the first direction, it can drive the first gear (21) to rotate along the second direction opposite to the first direction, and cause the support rod (211) to abut against the steep surface (2211) of the groove (221), and drive the second gear (22) and the third gear (23) to rotate synchronously along the second direction, so as to drive the first rack (30) and the push rod (31) to extend. When the drive gear set (10) rotates along the second direction, it can drive the first gear (21) to rotate along the first direction and cause the support rod (211) to abut against the gentle surface (2212) of the groove (221), and drive the second gear (22) and the third gear (23) to rotate synchronously along the first direction, so as to drive the first rack (30) and the push rod (31) to retract. When the first rack (30) moves to the limit position of retraction, the drive gear set (10) continues to rotate until the support rod (211) slides into the next groove (221) along the first direction along the gentle surface (2212).

2. The refrigerator door push rod structure according to claim 1, characterized in that, The support rods (211) are evenly spaced along the inner wall of the hollow (212), and the number of grooves (221) is greater than the number of support rods (211).

3. The refrigerator door push rod structure according to claim 1, characterized in that, The support rod (211) is inclined relative to the radial direction of the first gear (21) and extends obliquely into the groove (221).

4. The refrigerator door push rod structure according to claim 3, characterized in that, The support rod (211) and the inner wall of the hollow (212) have a first included angle (214) and a second included angle (215), the angle of the first included angle (214) is smaller than the angle of the second included angle (215), and an elastic element (213) is provided in the first included angle (214). Part of the elastic element (213) abuts against the support rod (211), and another part abuts against the inner wall of the hollow (212).

5. The refrigerator door push rod structure according to claim 4, characterized in that, The elastic element (213) is configured as a spring sheet structure. The elastic element (213) is bent to form a first section (2131) and a second section (2132). The first section (2131) abuts against the side of the support rod (211) forming the first included angle (214), and the second section (2132) abuts against the inner wall of the hollow (212). The first section (2131) and the second section (2132) are set at the first included angle (214).

6. The refrigerator door push rod structure according to claim 5, characterized in that, The support rod (211) has a first protrusion (2111) on the side forming the first included angle (214), and a first snap-fit ​​groove (2133) is provided on the first section (2131), and the first protrusion (2111) is snapped into the first snap-fit ​​groove (2133). The inner wall of the hollow (212) is provided with a second protrusion (2121), and the second section (2132) is provided with a second snap-fit ​​groove (2134), and the second protrusion (2121) is snapped into the second snap-fit ​​groove (2134).

7. The refrigerator door push rod structure according to claim 1, characterized in that, The refrigerator door push rod structure also includes a housing (50), in which the first rack (30), the drive gear set (10) and the transmission gear set (20) are all installed, and the drive gear set (10) is rotatably connected to the housing (50).

8. The refrigerator door push rod structure according to claim 7, characterized in that, The refrigerator door push rod structure also includes a second rack (40) and a guide gear (41). The second rack (40) is connected to the housing (50) and is arranged parallel to the first rack (30). The guide gear (41) is arranged between the first rack (30) and the second rack (40) and meshes with the first rack (30) and the second rack (40).

9. The refrigerator door push rod structure according to claim 1, characterized in that, The drive gear set (10) includes a large drive gear (11) and a small drive gear (12). The large drive gear (11) and the small drive gear (12) are coaxially arranged, and the large drive gear (11) is connected to the drive source. The small drive gear (12) is connected to the large drive gear (11) and rotates synchronously. The small drive gear (12) meshes with the first gear (21).

10. A refrigerator, characterized in that, Includes the refrigerator door push rod structure as described in any one of claims 1-9.

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