An overload protection bidirectional transmission shaft

Abstract

The present invention belongs to the technical field of drive shafts and household appliances, and specifically relates to an overload protection bidirectional drive shaft. The overload protection bidirectional drive shaft provided by the present invention includes a driving disc, an output shaft, an inner transmission assembly and an outer transmission assembly. The driving disc and the output shaft are arranged coaxially, and the distance between the driving disc and the output shaft in the axial direction is limited; one end of the output shaft has a limiting disc; the inner transmission assembly and the outer transmission assembly are both arranged between the driving disc and the limiting disc, and transmit power in opposite rotation directions respectively. Compared with the prior art, the overload protection bidirectional drive shaft provided by the present invention has a torque overload protection function, and in the process of the active disc driving the output shaft to rotate, if the output shaft is subjected to an external abnormal force, it can adaptively follow. The overload protection bidirectional drive shaft is particularly suitable for driving rotating parts such as movable doors in household appliances.

Description

Technical Field

[0001] The invention belongs to the technical field of transmission shafts and household appliances, and particularly relates to a bidirectional transmission shaft with overload protection. Background Art

[0002] The intelligentization of home appliances is a key development trend within the current industry. For example, appliances with movable doors, such as refrigerators, ovens, and sterilizers, are increasingly demanding automatic door opening and closing functions. However, given users' long-standing habit of manual operation, appliances that offer both automatic and manual operation are a better option.

[0003] In order to meet the needs of both automatic and manual door opening and closing of home appliances, the current mainstream solution is to add a clutch to the rotary actuator that drives the movement of the movable door, which is not only costly but also takes up a large space. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a bidirectional transmission shaft with overload protection.

[0005] The present invention generally provides an overload protection bidirectional transmission shaft, which comprises a driving disc, an output shaft, an inner transmission component and an outer transmission component.

[0006] The driving disc is coaxially arranged with the output shaft, and the distance between the driving disc and the output shaft in the axial direction is limited; a limit disc is provided at one end of the output shaft; the inner transmission assembly and the outer transmission assembly are both arranged between the driving disc and the limit disc.

[0007] The inner transmission assembly includes an inner inclined rail that abuts against the active disk, an inner compression spring that abuts against the limit disk, and an inner sliding ring that abuts between the inner inclined rail and the inner compression spring; the surface of the inner inclined rail has an inner ramp inclined along the circumferential direction, and the inner sliding ring has an inner guide part that slides along the inner ramp.

[0008] The outer transmission assembly includes an outer inclined rail that abuts against the active disk, an outer compression spring that abuts against the limit disk, and an outer slip ring abutting between the outer inclined rail and the outer compression spring; the surface of the outer inclined rail has an outer ramp inclined along the circumferential direction, and the outer slip ring has an outer guide part that slides along the outer ramp.

[0009] The inner ramp and the outer ramp have opposite inclination directions.

[0010] Furthermore, in the above-mentioned overload protection bidirectional transmission shaft, the surface of the active disc has an annular recessed area, in which a friction ring is embedded; the inner bevel rail and the outer bevel rail are both friction-drivenly connected to the friction ring.

[0011] Furthermore, in the above-mentioned overload protection bidirectional transmission shaft, the inner ramp includes a pair of semicircular tracks connected end to end and connected to each other by a steep slope transition; a pair of inner guide parts are centrally symmetrically distributed on the inner slip ring, and the guide parts can be slidably embedded in the grooves on the surface of the inner ramp.

[0012] Furthermore, in the above-mentioned overload protection bidirectional transmission shaft, the outer ramp includes a pair of semicircular tracks connected end to end and connected to each other by a steep slope transition; a pair of outer guide parts are centrally symmetrically distributed on the outer slip ring, and the outer guide parts can be slidably embedded in the grooves on the surface of the outer ramp.

[0013] Furthermore, in the above-mentioned overload protection bidirectional transmission shaft, the limit plate has a group of circumferentially distributed inner limit pins, the inner slip ring has a group of circumferentially distributed inner limit slots, and the inner limit pins are slidably fitted in the inner limit slots.

[0014] Furthermore, in the above-mentioned overload protection bidirectional transmission shaft, the limit plate has a group of circumferentially distributed external limit pins, and the outer slip ring has a group of circumferentially distributed external limit slots, and the external limit pins are slidably fitted in the external limit slots.

[0015] Furthermore, in the above-mentioned overload protection bidirectional transmission shaft, the outer periphery of the driving disc has a gear ring, a synchronous belt wheel ring, a belt pulley ring or a worm wheel ring for receiving the rotational torque.

[0016] Advantages: Compared to existing technologies, the overload-protected bidirectional drive shaft provided by this invention provides torque overload protection. Furthermore, when the active disk drives the output shaft, the output shaft can adapt to follow the rotation if subjected to an abnormal external force. This overload-protected bidirectional drive shaft is particularly suitable for driving rotating components such as movable doors in household appliances. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the bidirectional transmission shaft for overload protection.

[0018] Figure 2 and Figure 3 Exploded diagram of a bidirectional drive shaft for overload protection.

[0019] Figure 4 Installation diagram of the bidirectional transmission shaft for overload protection.

[0020] Figure 5 and Figure 6 This is an exploded diagram of the inner transmission component.

[0021] Figure 7 and Figure 8 This is an exploded diagram of the outer transmission component.

[0022] In the figure, the active disk 1, the output shaft 2, the inner transmission assembly 3, the outer transmission assembly 4, the limit disk 21, the inner inclined rail 31, the inner slip ring 32, the inner compression spring 33, the inner ramp 311, the inner guide portion 321, the outer inclined rail 41, the outer slip ring 42, the outer compression spring 43, the outer ramp 411, the outer guide portion 421, the friction ring 11, the inner limit pin 211, the inner limit slot 322, the outer limit pin 212, and the outer limit slot 422. DETAILED DESCRIPTION

[0023] The present invention is further illustrated by the following examples, which are intended to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the present invention.

[0024] Unless otherwise defined, technical or scientific terms used in this disclosure should be understood to have the ordinary meanings understood by persons of ordinary skill in the art. The terms "first," "second," and similar expressions used in this disclosure do not denote any order, quantity, or importance, but are simply used to distinguish different components. Terms such as "include" or "comprising" mean that the elements or objects preceding the term include the elements or objects listed after the term, and their equivalents, without excluding other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Example 1

[0026] like Figure 1 、 Figure 2 、 Figure 3 The figure shows an overload protection bidirectional transmission shaft, comprising a driving disc 1, an output shaft 2, an inner transmission assembly 3 and an outer transmission assembly 4.

[0027] The active disk 1 and the output shaft 2 are arranged coaxially, and the distance between the active disk 1 and the output shaft 2 in the axial direction is limited. When actually used, the overload protection bidirectional transmission shaft is usually installed in a product with a rotating structure, such as being installed in a refrigerator as the rotating door shaft of the refrigerator, or being installed in a rotary actuator as the output shaft of the rotary actuator. Therefore, limiting the distance between the active disk 1 and the output shaft 2 in the axial direction is selected according to the actual usage scenario. There are many ways to limit this axial distance, which are conventional technical means, such as using thrust bearings to limit the active disk 1 and the output shaft 2, and Figure 4 The diagram schematically shows a method of limiting the driving disc 1 and the output shaft 2 by using a fixed housing.

[0028] One end of the output shaft 2 is provided with a limiting plate 21 ; the inner transmission assembly 3 and the outer transmission assembly 4 are both arranged between the driving plate 1 and the limiting plate 21 .

[0029] like Figure 5 、 Figure 6 As shown, the inner transmission assembly 3 includes an inner inclined rail 31 abutting against the active disk 1, an inner compression spring 33 abutting against the limit disk 21, and an inner sliding ring 32 abutting between the inner inclined rail 31 and the inner compression spring 33; the surface of the inner inclined rail 31 has an inner ramp 311 inclined along the circumferential direction, and the inner sliding ring 32 has an inner guide portion 321 sliding along the inner ramp 311.

[0030] like Figure 7 、 Figure 8 As shown, the outer transmission assembly 4 includes an outer inclined rail 41 abutting against the active disk 1, an outer compression spring 43 abutting against the limit disk 21, and an outer slip ring 42 abutting between the outer inclined rail 41 and the outer compression spring 43; the surface of the outer inclined rail 41 has an outer ramp 411 inclined along the circumferential direction, and the outer slip ring 42 has an outer guide portion 421 sliding along the outer ramp 411; the inner ramp 311 is opposite to the inclination direction of the outer ramp 411.

[0031] like Figure 2 As shown, the surface of the active disk 1 has an annular recessed area, within which a friction ring 11 is embedded. The inner bevel rail 31 and the outer bevel rail 41 are both frictionally connected to the friction ring 11. Specifically, the elastic force of the inner compression spring 33 is transmitted to the inner bevel rail 31, pressing it against the friction ring 11. Similarly, the elastic force of the outer compression spring 43 is transmitted to the outer bevel rail 41, pressing it against the friction ring 11. Thus, when the friction ring 11 rotates with the active disk 1, friction generates a driving force that drives the inner and outer bevel rails 31 and 41 to rotate synchronously. Whether the inner and outer bevel rails 31 and 41 rotate synchronously depends on the relative magnitude of the resistance and driving force experienced by the inner and outer bevel rails 31 and 41, respectively.

[0032] like Figure 5 、 Figure 6 As shown, the inner ramp 311 includes a pair of semicircular tracks connected end to end and connected to each other by a steep slope transition; a pair of inner guide parts 321 are distributed symmetrically on the center of the inner slip ring 32, and the guide parts 321 can be slidably embedded in the grooves on the surface of the inner ramp 311.

[0033] like Figure 7 、 Figure 8 As shown, the outer ramp 411 includes a pair of semicircular tracks connected end to end and connected to each other by a steep slope transition; a pair of outer guide parts 421 are symmetrically distributed on the center of the outer slip ring 42, and the outer guide parts 421 can be slidably embedded in the groove on the surface of the outer ramp 411.

[0034] like Figure 3 As shown, the limit plate 21 has a group of circumferentially distributed inner limit pins 211, and the inner slip ring 32 has a group of circumferentially distributed inner limit slots 322, and the inner limit pins 211 slide fit in the inner limit slots 322, thereby ensuring that the output shaft 2 and the inner slip ring 32 maintain synchronous rotation and can slide axially.

[0035] like Figure 3 As shown, the limit plate 21 has a group of circumferentially distributed external limit pins 212, and the outer slip ring 42 has a group of circumferentially distributed external limit slots 422. The outer limit pins 212 are slidably fitted in the outer limit slots 422, thereby ensuring that the output shaft 2 and the outer slip ring 42 maintain synchronous rotation and can slide axially.

[0036] The outer periphery of the driving disc 1 can be provided with a gear ring, a synchronous belt wheel ring, a belt wheel ring or a worm wheel ring according to the required transmission form to receive the rotational torque.

[0037] The above-mentioned overload protection bidirectional transmission shaft transmits power through the inner transmission component 3 and the outer transmission component 4 with opposite transmission directions and flexible transmission characteristics on the active disk 1 and the output shaft 2. It can be widely used to drive the movement of rotating parts, especially for household appliances that need to take into account both manual and automatic door opening and closing.

[0038] The following describes the working process of the overload protection bidirectional drive shaft using the application scenario of opening and closing the refrigerator door as an example. In this overload protection bidirectional drive shaft, the active disk 1 receives the rotational driving force from the power unit and transmits it to the output shaft 2. The output shaft is installed on the refrigerator door to drive the refrigerator door to rotate.

[0039] In actual operation, it may be assumed that the active disk 1 rotates clockwise. Figure 2 As indicated by the arrow, the active disc 1 drives the friction ring 11 to rotate clockwise. Due to friction, the friction ring 11 tends to rotate the inner bevel rail 31 and the outer bevel rail 41. However, due to the load on the output shaft 2, which creates a certain resistance, the rotation of the outer slip ring 42 lags behind the outer bevel rail 41. In other words, the outer guide portion 421 moves uphill on the outer ramp 411, causing the elastic force of the outer compression spring 43 to gradually increase until the active disc 1, the outer bevel rail 41, the outer slip ring 42, and the output shaft 2 all rotate synchronously. While the outer guide portion 421 moves uphill on the outer ramp 411, the inner guide portion 321 can adaptively move downhill on the inner ramp 311 until it reaches a steep slope. If the movement continues, the inner bevel rail 31 will enter a stage of adaptive sliding relative to the friction ring 11. However, since the inner compression spring 33 is at its most relaxed state at this point, the resistance is minimal, and the clockwise transmission of the output shaft 2 by the active disc 1 is not affected.

[0040] Similarly, if the active disk 1 rotates counterclockwise, the rotational driving force of the active disk 1 is transmitted to the output shaft 2 through the inner transmission component 3, while the outer transmission component 4 only performs adaptive follow-up and does not actually transmit power.

[0041] If, while the active disk 1 is rotating the output shaft 2 clockwise, a user intervenes to rotate the refrigerator door clockwise at a faster speed, the outer guide portion 421 will move downhill on the outer ramp 411, reducing resistance and not hindering manual opening of the refrigerator door. If, however, the user intervenes to rotate the refrigerator door clockwise at a slower speed or in the opposite direction, the outer guide portion 421 will move uphill on the outer ramp 411, still achieving the user's desired manual rotational operation, though resistance will increase. If, while the active disk 1 is rotating the output shaft 2 clockwise, the refrigerator door encounters resistance or is forcibly rotated in the opposite direction, the outer guide portion 421 will move uphill on the outer ramp 411, reaching the top and dropping to the bottom. This releases resistance and limits its continued increase, thus implementing overload protection, protecting both the user and the internal mechanical structure.

[0042] Similarly, since the inner transmission assembly 3 and the outer transmission assembly 4 are structurally equivalent and only rotate in opposite directions, the function of the driving disk 1 when it rotates counterclockwise is the same as when it rotates clockwise.

[0043] The above embodiments are exemplary and intended to illustrate the technical concepts and features of the present invention so that those skilled in the art can understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An overload protection bidirectional transmission shaft, characterized by: It comprises a driving disc (1), an output shaft (2), an inner transmission assembly (3) and an outer transmission assembly (4); The active disk (1) and the output shaft (2) are coaxially arranged, and the distance between the active disk (1) and the output shaft (2) in the axial direction is limited; one end of the output shaft (2) is provided with a limiting disk (21); the inner transmission assembly (3) and the outer transmission assembly (4) are both arranged between the active disk (1) and the limiting disk (21); The inner transmission assembly (3) comprises an inner inclined rail (31) abutting against the active disk (1), an inner compression spring (33) abutting against the limit disk (21), and an inner sliding ring (32) abutting between the inner inclined rail (31) and the inner compression spring (33); the surface of the inner inclined rail (31) has an inner ramp (311) inclined along the circumferential direction, and the inner sliding ring (32) has an inner guide portion (321) sliding along the inner ramp (311); The outer transmission assembly (4) comprises an outer inclined rail (41) abutting against the active disk (1), an outer compression spring (43) abutting against the limit disk (21), and an outer sliding ring (42) abutting between the outer inclined rail (41) and the outer compression spring (43); the outer inclined rail (41) has an outer ramp (411) inclined in a circumferential direction on its surface, and the outer sliding ring (42) has an outer guide portion (421) sliding along the outer ramp (411); The inner ramp (311) and the outer ramp (411) have opposite inclination directions; The inner ramp (311) includes a pair of semicircular tracks connected end to end and connected to each other through a steep slope transition at the connection point; a pair of inner guide parts (321) are centrally symmetrically distributed on the inner slip ring (32), and the guide parts (321) are slidably embedded in the grooves on the surface of the inner ramp (311); The outer ramp (411) comprises a pair of semicircular tracks connected end to end and connected to each other by a steep slope transition at the connection point; a pair of outer guide parts (421) are centrally symmetrically distributed on the outer slip ring (42), and the outer guide parts (421) are slidably embedded in the grooves on the surface of the outer ramp (411).

2. The overload protection bidirectional transmission shaft according to claim 1, characterized in that: The active disk (1) has an annular recessed area on its surface, and a friction ring (11) is embedded in the annular recessed area; the inner inclined rail (31) and the outer inclined rail (41) are both frictionally connected to the friction ring (11).

3. The overload protection bidirectional transmission shaft according to claim 1, characterized in that: The limiting plate (21) has a group of circumferentially distributed inner limiting pins (211), the inner slip ring (32) has a group of circumferentially distributed inner limiting notches (322), and the inner limiting pins (211) are slidably fitted in the inner limiting notches (322).

4. The overload protection bidirectional transmission shaft according to claim 1, characterized in that: The limiting disk (21) has a group of circumferentially distributed external limiting pins (212), the outer slip ring (42) has a group of circumferentially distributed external limiting notches (422), and the external limiting pins (212) are slidably fitted in the external limiting notches (422).

5. The overload protection bidirectional transmission shaft according to claim 1, characterized in that: The outer periphery of the driving disc (1) is provided with a gear ring, a pulley ring or a worm gear ring for receiving a rotational torque.

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