Fan body bottom bearing transmission device and door and window

Abstract

The utility model discloses a leaf body bottom load-bearing transmission device and a door window, the load-bearing transmission device comprises a transmission hinge and a load-bearing shaft, one end of the transmission hinge is rotatably connected with a sliding seat at the bottom edge of a frame body, and the other end of the transmission hinge is rotatably connected with the load-bearing shaft. A bearing part is arranged on the bearing shaft, and a plurality of steel balls are arranged between the bearing part and the rotary connecting part. The top end of the bearing shaft is fixedly connected with the fixing piece to be connected with the bottom of the fan body, and therefore the weight of the fan body can be transmitted to the steel balls through the bearing part of the bearing shaft. According to the utility model, the bearing part is arranged on the bearing shaft and is matched with the steel balls, so that the transmission hinge can rotate relative to the bearing shaft while bearing, the same function as a bearing is realized, and the bearing with a complicated structure is replaced. Compared with a bearing, the combined structure of the bearing part and the steel balls is simpler in structure and smaller in occupied space; on the premise that the installation space is not changed, the diameter of the bearing shaft can be increased, and the bearing capacity of the transmission device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of doors and windows, and particularly relates to a bottom load-bearing transmission device for a sash and a door and window. Background Art

[0002] A suspended-opening sliding window is a type of window that can be pushed and pulled open, and can also be suspended outward or inward after the window sash is pushed away from the window frame outward or inward. Since the window sash needs to be pushed away from the window frame, a bottom load-bearing transmission device with a special structure is required. While connecting the window sash and the window frame, this bottom load-bearing transmission device also has a rotatable function.

[0003] In order to achieve the rotatable function, bearings are used in the load-bearing transmission device in the prior art. A bearing is an important component in contemporary mechanical equipment, and its main function is to support the mechanical rotating body and reduce the friction coefficient during its movement. However, a bearing has components such as an outer ring, steel balls, and an inner ring, with a relatively complex structure and a large occupied space. When applying the bearing to the load-bearing transmission device, since the installation space at the bottom of the sash is very limited, the volume of the entire load-bearing transmission device is also restricted, which results in relatively small sizes of the relevant load-bearing components in the load-bearing transmission device, restricting the improvement of the load-bearing capacity of the load-bearing transmission device. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a bottom load-bearing transmission device for a sash and a door and window, which can solve the problems that the load-bearing transmission device in the prior art uses bearings to achieve the rotatable function, resulting in a complex structure and an increased volume of the transmission device, which is not conducive to improving the load-bearing capacity of the transmission device.

[0005] In the first aspect of the utility model, a bottom load-bearing transmission device for a sash is provided, including a transmission hinge and a load-bearing shaft. One end of the transmission hinge is rotatably connected to a sliding seat at the bottom edge of the frame body, and the other end is a rotating connection part, and the rotating connection part is rotatably connected to the load-bearing shaft;

[0006] A load-bearing part is provided on the load-bearing shaft, and a plurality of steel balls are arranged between the load-bearing part and the rotating connection part;

[0007] The top end of the load-bearing shaft is fixedly connected to a fixing part at the bottom edge of the sash for connecting the bottom of the sash.

[0008] In some embodiments, the load-bearing part is an upward convex edge provided at the upper end of the load-bearing shaft. The rotating connection part is sleeved on the outer peripheral edge of the load-bearing shaft, and a first annular step is provided at the top end of the inner hole of the rotating connection part. The steel balls are arranged between the upward convex edge and the first annular step.

[0009] Further, a steel ball retaining ring is embedded on the first annular step, and the steel balls are arranged between the steel ball retaining ring and the upper convex edge.

[0010] In some embodiments, the load-bearing part is a lower convex edge provided at the lower end of the load-bearing shaft. The rotation connection part is sleeved on the outer peripheral edge of the load-bearing shaft. A second annular step is provided at the bottom end of the inner hole of the rotation connection part, and the steel balls are arranged between the lower convex edge and the second annular step.

[0011] Further, the lower convex edge is a gasket ring sleeved on the peripheral edge of the bottom end of the load-bearing shaft. A ring-shaped groove is provided on the peripheral edge of the bottom end of the load-bearing shaft, and the gasket ring is fixed on the load-bearing shaft by sleeving a ring-shaped hoop into the groove.

[0012] Further, a steel ball cover ring is embedded between the second annular step and the gasket ring, and the steel balls are arranged between the steel ball cover ring and the gasket ring.

[0013] Further, the load-bearing part is an upper convex edge provided at the upper end of the load-bearing shaft. The rotation connection part is sleeved on the outer peripheral edge of the load-bearing shaft. A shaft sleeve is clamped between the inner hole wall of the rotation connection part and the outer peripheral edge of the load-bearing shaft. The shaft sleeve is located below the upper convex edge. A third annular step is provided at the top end of the inner hole of the shaft sleeve, and the steel balls are arranged between the third annular step and the upper convex edge.

[0014] Further, a ring-shaped groove is provided at the bottom end of the load-bearing shaft. A snap ring is clamped between the inner hole wall of the shaft sleeve and the outer peripheral edge of the bottom end of the load-bearing shaft. A snap buckle extends from the inner hole wall of the shaft sleeve, and the snap buckle is snap-connected to the snap ring. Moreover, the snap ring is fixed on the load-bearing shaft by sleeving a ring-shaped hoop into the groove.

[0015] Further, an internal thread is provided on the inner hole wall of the rotation connection part, and an external thread is provided on the outer peripheral edge of the shaft sleeve. The shaft sleeve is thread-connected to the rotation connection part, and a screwing part for cooperating with a screwing tool is provided at the bottom end of the shaft sleeve.

[0016] Further, a shaft sleeve is clamped between the inner hole wall of the rotation connection part and the outer peripheral edge of the load-bearing shaft. A convex edge extends outward from the top end of the shaft sleeve, and the convex edge of the shaft sleeve supports the upper convex edge of the load-bearing shaft. The steel balls are arranged between the convex edge of the shaft sleeve and the first annular step.

[0017] Further, an internal thread is provided on the inner hole wall of the shaft sleeve, and an external thread is provided on the outer peripheral edge of the load-bearing shaft. The load-bearing shaft is thread-connected to the shaft sleeve, and a screwing part for cooperating with a screwing tool is provided at the bottom end of the load-bearing shaft.

[0018] In the second aspect of the present utility model, a door and window is provided, which includes a sash and a frame. A sliding seat is provided at the bottom edge of the frame, and the fixing member and the sliding seat are connected by the above-mentioned load-bearing transmission device at the bottom of the sash.

[0019] Compared with the prior art, the present utility model has the beneficial effects that:

[0020] The load-bearing transmission device at the bottom of the sash provided by the present utility model includes a transmission hinge and a load-bearing shaft. One end of the transmission hinge is rotatably connected to the sliding seat at the bottom edge of the frame, and the other end is a rotating connection part, which is rotatably connected to the load-bearing shaft. A load-bearing part is provided on the load-bearing shaft, and multiple steel balls are arranged between the load-bearing part and the rotating connection part. The top end of the load-bearing shaft is fixedly connected to the fixing member at the bottom edge of the sash. Thus, the weight of the sash can be transmitted from the load-bearing part of the load-bearing shaft to the steel balls, and the load-bearing part can rotate relative to the steel balls. It can be seen that by providing a load-bearing part on the load-bearing shaft and cooperating with the steel balls, the present utility model can make the transmission hinge rotate relative to the load-bearing shaft while bearing the load, realizing the same function as a bearing, thereby replacing the bearing with a complex structure. Since the structure of the combination of the load-bearing part and the steel balls is simpler than that of the bearing and occupies less space, the diameter of the load-bearing shaft can be increased on the premise that the installation space remains unchanged, improving the load-bearing capacity of the transmission device. Description of the Drawings

[0021] Figure 1 is a longitudinal sectional structure schematic diagram of the load-bearing transmission device at the bottom of the sash provided in Embodiment 1 of the present utility model;

[0022] Figure 2 is an exploded structure schematic diagram of the load-bearing transmission device at the bottom of the sash provided in Embodiment 1 of the present utility model;

[0023] Figure 3 is a schematic diagram of the load-bearing transmission device at the bottom of the sash provided in Embodiment 1 of the present utility model connecting the sliding seat and the fixing member;

[0024] Figure 4 is a longitudinal sectional structure schematic diagram of the load-bearing transmission device at the bottom of the sash provided in Embodiment 2 of the present utility model;

[0025] Figure 5 is an exploded structure schematic diagram of the load-bearing transmission device at the bottom of the sash provided in Embodiment 2 of the present utility model;

[0026] Figure 6 is a longitudinal sectional structure schematic diagram of the load-bearing transmission device at the bottom of the sash with an adjustment structure provided in Embodiment 2 of the present utility model;

[0027] Figure 7 is Figure 7 a three-dimensional structure schematic diagram of the load-bearing transmission device at the bottom of the sash shown;

[0028] Figure 8 It is a schematic longitudinal sectional structure diagram of the bottom load-bearing transmission device of the fan body provided in the third embodiment of the present utility model;

[0029] Figure 9 It is a schematic exploded structure diagram of the bottom load-bearing transmission device of the fan body provided in the third embodiment of the present utility model;

[0030] Figure 10 It is a schematic longitudinal sectional structure diagram of the bottom load-bearing transmission device of the fan body with an adjustment structure provided in the third embodiment of the present utility model.

[0031] Explanation of reference numerals:

[0032] 1. Transmission hinge; 11. Rotating connection part; 111. First annular step; 112. Second annular step; 2. Load-bearing shaft; 21. Upper convex edge; 22. Card slot; 23. Second external thread; 24. Second screwing part; 3. Steel ball; 4. Steel ball retaining ring; 5. Pad ring; 6. Ring hoop; 7. Steel ball cover ring; 8. Sleeve; 81. Third annular step; 82. Snap; 83. First external thread; 84. First screwing part; 85. Convex edge; 9. Snap ring; 200. Sliding seat; 300. Fixed part. Detailed implementation manners

[0033] In the prior art, for the load-bearing transmission device connecting the fan body and the frame body of doors and windows, bearings are used to achieve the rotatable function, resulting in a complex structure and an increased volume of the transmission device, which is not conducive to improving the load-bearing capacity of the transmission device. Therefore, the present utility model provides some embodiments to solve the above technical problems.

[0034] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0035] Embodiment 1:

[0036] Refer to Figure 1 and Figure 2 , which show a bottom load-bearing transmission device of a fan body provided in this embodiment, including a transmission hinge 1 and a load-bearing shaft 2. Please refer to Figure 3 together. One end of the transmission hinge 1 is rotatably connected to the sliding seat 200 at the bottom edge of the frame body, and the other end is a rotating connection part 11. The rotating connection part 11 is rotatably connected to the load-bearing shaft 2. The top end of the load-bearing shaft 2 is fixedly connected to the fixed part 300 at the bottom edge of the fan body for connecting the bottom of the fan body.

[0037] A load-bearing part is provided on the load-bearing shaft 2, and multiple steel balls 3 are arranged between the load-bearing part and the rotating connection part 11. Thus, the weight of the fan body can be transmitted from the load-bearing part of the load-bearing shaft 2 to the steel balls 3.

[0038] Specifically, the load-bearing part of this embodiment is an upper convex edge 21 provided at the upper end of the load-bearing shaft 2. A first annular step 111 is provided at the top end of the inner hole of the rotating connection part 11. A steel ball retaining ring 4 is embedded on the first annular step 111, and multiple steel balls 4 are arranged between the steel ball retaining ring 4 and the upper convex edge 21.

[0039] Furthermore, the load-bearing part of this embodiment further includes a lower convex edge. A second annular step 112 is provided at the bottom end of the inner hole of the rotating connection part 11. Specifically, the lower convex edge is a gasket ring 5 sleeved on the peripheral edge of the bottom end of the load-bearing shaft z. A steel ball cover ring 7 is embedded between the second annular step 112 and the gasket ring 5, and the steel balls 3 are arranged between the steel ball cover ring 7 and the gasket ring 5. A ring-shaped groove 22 is provided on the peripheral edge of the bottom end of the load-bearing shaft 2, and the gasket ring 5 is fixed on the load-bearing shaft 2 by being sleeved into a ring-shaped hoop 6 in the groove 22. The gasket ring 5 can support the rotating connection part 11.

[0040] Through the structural design of the combination of the lower convex edge and the steel balls 3 in this embodiment, on the one hand, it can play a load-bearing role, sharing the pressure at the position of the upper convex edge 21 at the top of the load-bearing shaft 2 and avoiding excessive concentration of stress on the load-bearing shaft 2. On the other hand, it can also ensure that the load-bearing shaft 2 can rotate smoothly relative to the rotating connection part 11, realizing the same function as a bearing, thereby replacing the bearing at this position.

[0041] In summary, in this embodiment, by providing a load-bearing part on the load-bearing shaft 2 and cooperating with the steel balls 3, while bearing the load, the transmission hinge can rotate relative to the load-bearing shaft 2, realizing the same function as a bearing, thereby replacing the bearing with a complex structure. Since the structure of the combination of the load-bearing part and the steel balls 3 is simpler than that of a bearing and occupies less space; on the premise of the same installation space, the diameter of the load-bearing shaft can be increased, improving the load-bearing capacity of the transmission device.

[0042] Refer again to Figure 3 , this embodiment also provides a door and window, including a fan body and a frame body. A fixing part 300 is provided at the bottom edge of the fan body, and a sliding seat 200 is provided at the bottom edge of the frame body. The fixing part 300 and the sliding seat 200 are connected by the above-mentioned load-bearing transmission device at the bottom of the fan body. Under the condition of the same installation space, since the diameter of the load-bearing shaft 2 can be made larger than that of the load-bearing shaft of the existing load-bearing transmission device, and the load-bearing capacity is improved, the fan body can be made thicker or more glass layers can be arranged.

[0043] Embodiment Two:

[0044] Refer to Figure 4 and Figure 5, which shows a load-bearing transmission device at the bottom of a fan body provided in this embodiment, including a transmission hinge 1 and a load-bearing shaft 2. One end of the transmission hinge 1 is rotatably connected to a sliding seat at the bottom edge of the frame body, and the other end is a rotating connection portion 11. The rotating connection portion 11 is rotatably connected to the load-bearing shaft 2, and the top end of the load-bearing shaft 2 is fixedly connected to a fixing member 300 at the bottom edge of the fan body.

[0045] The rotating connection portion 11 is sleeved on the outer peripheral edge of the load-bearing shaft 2. A shaft sleeve 8 is clamped between the inner hole wall of the rotating connection portion 11 and the outer peripheral edge of the load-bearing shaft 2. An upper convex edge 21 is provided on the outer peripheral edge of the upper end of the load-bearing shaft 2. The shaft sleeve 8 is located below the upper convex edge 21. A third annular step 81 is provided at the top end of the inner hole of the shaft sleeve 8. A plurality of steel balls 3 are provided between the third annular step 81 and the upper convex edge 21.

[0046] In this embodiment, through the structural design of setting the upper convex edge 21 on the load-bearing shaft 2 and cooperating with the steel balls 3, the weight of the fan body can be transmitted from the upper convex edge 21 of the load-bearing shaft 2 to the steel balls 3, and the upper convex edge 21 can rotate relative to the steel balls 3. It can be seen that the load-bearing transmission device in this embodiment can make the load-bearing shaft 2 rotate smoothly relative to the rotating connection portion 11 while bearing the load, realizing the same function as a bearing, thereby replacing the bearing. Compared with using a bearing, the solution provided in this embodiment has a simpler structure and occupies less space; on the premise that the installation space remains unchanged, the diameter of the load-bearing shaft 2 can be increased to improve the load-bearing capacity of the transmission device.

[0047] Specifically, a ring-shaped card slot 22 is provided at the bottom end of the load-bearing shaft 2. A snap ring 9 is clamped between the inner hole wall of the shaft sleeve 8 and the outer peripheral edge of the bottom end of the load-bearing shaft 2. A snap buckle 82 extends from the inner hole wall of the shaft sleeve 8. The snap buckle 82 is snap-connected to the snap ring 9. And the snap ring 9 is fixed on the load-bearing shaft 2 by sleeving a ring-shaped hoop 6 into the card slot 22. The snap ring 9 can support the shaft sleeve 8.

[0048] Further, referring to Figure 6 , a first internal thread is provided on the inner hole wall of the rotating connection portion 11, and a first external thread 83 is provided on the outer peripheral edge of the shaft sleeve 8. The shaft sleeve 8 is threadedly connected to the rotating connection portion 11. A first screwing portion 84 for cooperating with a screwing tool is provided at the bottom end of the shaft sleeve 8. In practical applications, the first screwing portion 84 can be a protruding structure or a recessed structure (such as Figure 7 shown), for example, a recessed cross-shaped structure, a recessed hexagonal structure, etc., as long as it can cooperate with the screwing tool.

[0049] Due to the long-term heavy pressure of the load-bearing shaft 2 on the fan body of the door and window, the load-bearing shaft 2 will sink together with the fan body relative to the rotating connection part 11. The bottom edge of the fan body will squeeze against the top of the rotating connection part 11 to generate friction, which will affect the rotation of the load-bearing transmission device, resulting in difficulty in pushing the fan body away from the frame. At this time, a screwing tool can be used to screw the sleeve 8 at the position below the load-bearing transmission device, so that the sleeve 8 and the load-bearing shaft 2 move upward relative to the rotating connection part 11 together, thereby playing a role in lifting the fan body to prevent the bottom edge of the fan body from squeezing against the rotating connection part 11.

[0050] Embodiment 3:

[0051] Referring to Figure 8 and Figure 9 shows a load-bearing transmission device at the bottom of a fan body provided in this embodiment, including a transmission hinge 1 and a load-bearing shaft 2. One end of the transmission hinge 1 is rotatably connected to a sliding seat at the bottom edge of the frame, and the other end is a rotating connection part 11. The rotating connection part 11 is rotatably connected to the load-bearing shaft 2, and the top end of the load-bearing shaft 2 is fixedly connected to a fixing part 300 at the bottom edge of the fan body.

[0052] The rotating connection part 11 is sleeved on the outer peripheral edge of the load-bearing shaft 2. A sleeve 8 is sandwiched between the inner hole wall of the rotating connection part 11 and the outer peripheral edge of the load-bearing shaft 2. The top end of the sleeve 8 extends outwards to form a flange 85. An upper flange 21 is provided on the outer peripheral edge of the upper end of the load-bearing shaft 2. The sleeve 8 is located below the upper flange 21, and the flange 85 of the sleeve 8 supports the upper flange 21 of the load-bearing shaft 2, so that the gravity received by the load-bearing shaft 2 can be transmitted to the sleeve 8. [[ID=!4]]

[0053] A first annular step 111 is provided at the top end of the inner hole of the rotating connection part 11. A steel ball retaining ring 4 is embedded on the first annular step 11. The steel ball retaining ring 4 is located below the flange 85 of the sleeve 8, and a plurality of steel balls 3 are provided between the steel ball retaining ring 4 and the flange 85.

[0054] In this embodiment, through the structural design of providing a flange 85 at the top end of the sleeve 8 and cooperating with the steel balls The weight of the fan body can be transmitted from the upper flange 21 of the load-bearing shaft 2 to the sleeve 8, and then to the steel balls 3. The flange 85 of the sleeve 8 can rotate relative to the steel balls 3. It can be seen that the load-bearing transmission device of this embodiment can make the sleeve 8 rotate smoothly relative to the rotating connection part 11 while bearing the load, realizing the same function as a bearing, thus replacing the bearing. Compared with the bearing, the solution provided in this embodiment has a simpler structure and occupies less space; on the premise of the same installation space, the diameter of the load-bearing shaft 2 can be increased to improve the load-bearing capacity of the transmission device.

[0055] Furthermore, a ring-shaped slot 22 is provided on the outer peripheral edge of the bottom end of the bushing 8. A gasket ring 5 is clamped in the slot 22. A ring-shaped hoop 6 is provided below the gasket ring 5. The gasket ring 5 is fixed on the bushing 8 through the ring-shaped hoop 6. The outer peripheral edge of the gasket ring 5 protrudes out of the outer peripheral edge of the bushing 8. A second ring-shaped step 112 is provided at the bottom end of the rotary connection part 11. A steel ball cover ring 7 is placed on the gasket ring 5. Multiple steel balls 3 are embedded between the gasket ring 5 and the steel ball cover ring 7.

[0056] In some other embodiments, the steel ball cover ring 7 can also be an integral structure with the load-bearing shaft 2, that is, the steel ball cover ring 7 can be a part extended from the outer peripheral edge of the lower end of the load-bearing shaft 2.

[0057] In this embodiment, through the structural design of the combination of the gasket ring 5 and the steel balls 3, on the one hand, it can play a load-bearing role, sharing the pressure on the convex edge at the top of the bushing 8 and avoiding excessive concentration of force on the bushing 8. On the other hand, it can also ensure that the bushing 8 can rotate smoothly relative to the rotary connection part 11, realizing the same function as a bearing, thereby replacing the bearing at this position.

[0058] Furthermore, referring to Figure 10 , a second internal thread is provided on the inner hole wall of the bushing 8. A second external thread 23 is provided on the outer peripheral edge of the load-bearing shaft 2. The load-bearing shaft 2 is threadedly connected to the bushing 8. A second screwing part 24 for cooperating with a screwing tool is provided at the bottom end of the load-bearing shaft 2. In practical applications, the second screwing part 24 can be a protruding structure or a recessed structure. For example, a recessed cross-shaped structure, a recessed hexagonal structure, etc., as long as it can cooperate with a screwing tool; Figure 10 shows a screw embedded in the bottom end of the load-bearing shaft 2, and the head of the screw serves as the second screwing part 24.

[0059] Due to the long-term heavy pressure of the load-bearing shaft 2 on the fan body of the door and window, the load-bearing shaft 2 will sink together with the fan body relative to the rotary connection part 11. The bottom edge of the fan body will squeeze the top of the bushing 8 to generate friction, and this friction will affect the rotation of the load-bearing transmission device, resulting in difficulty in pushing the fan body away from the frame. At this time, a screwing tool can be used to screw the load-bearing shaft 2 at a position below the load-bearing transmission device, so that the load-bearing shaft 2 moves upward relative to the rotary connection part 11, thereby playing a role in lifting the fan body to avoid the bottom edge of the fan body squeezing the bushing.

[0060] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model; the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; in addition, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0061] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A load-bearing transmission device at the bottom of a fan body, characterized in that, It includes a transmission hinge and a load-bearing shaft. One end of the transmission hinge is rotatably connected to a sliding seat at the bottom edge of the frame body, and the other end is a rotating connection part, which is rotatably connected to the load-bearing shaft; A load-bearing part is provided on the load-bearing shaft, and a plurality of steel balls are arranged between the load-bearing part and the rotating connection part; The top end of the load-bearing shaft is fixedly connected to a fixing part at the bottom edge of the fan body for connecting the bottom of the fan body.

2. The bottom load-bearing transmission device of the fan body according to claim 1, wherein The load-bearing part is an upper convex edge provided at the upper end of the load-bearing shaft. The rotating connection part is sleeved on the outer peripheral edge of the load-bearing shaft. A first annular step is provided at the top end of the inner hole of the rotating connection part. The steel balls are arranged between the upper convex edge and the first annular step.

3. The fan body bottom load-bearing transmission device according to claim 2, characterized in that, A steel ball retaining ring is embedded on the first annular step, and the steel balls are arranged between the steel ball retaining ring and the upper convex edge.

4. The bottom load-bearing transmission device of the fan body according to claim 1, characterized in that The load-bearing part is a lower convex edge provided at the lower end of the load-bearing shaft. The rotating connection part is sleeved on the outer peripheral edge of the load-bearing shaft. A second annular step is provided at the bottom end of the inner hole of the rotating connection part. The steel balls are arranged between the lower convex edge and the second annular step.

5. The bottom bearing drive device of the fan body according to claim 4, characterized in that The lower convex edge is a gasket ring sleeved on the peripheral edge of the bottom end of the load-bearing shaft. A ring-shaped groove is provided on the peripheral edge of the bottom end of the load-bearing shaft. The gasket ring is fixed on the load-bearing shaft by sleeving a ring-shaped hoop in the groove.

6. The bottom load-bearing transmission device of the fan body according to claim 5, characterized in that, A steel ball cover ring is embedded between the second annular step and the gasket ring, and the steel balls are arranged between the steel ball cover ring and the gasket ring.

7. The bottom weight-bearing transmission device of the fan body according to claim 1, characterized in that, The load-bearing part is an upper convex edge provided at the upper end of the load-bearing shaft. The rotating connection part is sleeved on the outer peripheral edge of the load-bearing shaft. A shaft sleeve is clamped between the inner hole wall of the rotating connection part and the outer peripheral edge of the load-bearing shaft. The shaft sleeve is located below the upper convex edge. A third annular step is provided at the top end of the inner hole of the shaft sleeve. The steel balls are arranged between the third annular step and the upper convex edge.

8. The bottom load-bearing transmission device of the fan body according to claim 7, characterized in that, A ring-shaped groove is provided at the bottom end of the load-bearing shaft. A snap ring is clamped between the inner hole wall of the shaft sleeve and the outer peripheral edge of the bottom end of the load-bearing shaft. A snap is extended from the inner hole wall of the shaft sleeve, and the snap is snap-connected to the snap ring. And the snap ring is fixed on the load-bearing shaft by sleeving a ring-shaped hoop in the groove.

9. The bottom load-bearing transmission device of the fan body according to claim 7, characterized in that, Internal threads are provided on the inner hole wall of the rotating connection part, external threads are provided on the outer peripheral edge of the shaft sleeve, the shaft sleeve is threadedly connected to the rotating connection part, and a screwing part for cooperating with a screwing tool is provided at the bottom end of the shaft sleeve.

10. The bottom load-bearing transmission device of the fan body according to claim 2, characterized in that, A shaft sleeve is clamped between the inner hole wall of the rotating connection part and the outer peripheral edge of the load-bearing shaft. A convex edge extends from the top end of the shaft sleeve in the outer side direction. The convex edge of the shaft sleeve supports the upper convex edge of the load-bearing shaft. The steel balls are arranged between the convex edge of the shaft sleeve and the first annular step.

11. The bottom load-bearing transmission device of the fan body according to claim 10, characterized in that, Internal threads are provided on the inner hole wall of the shaft sleeve, external threads are provided on the outer peripheral edge of the load-bearing shaft, the load-bearing shaft is threadedly connected to the shaft sleeve, and a screwing part for cooperating with a screwing tool is provided at the bottom end of the load-bearing shaft.

12. A door and window, comprising a sash and a frame, wherein a sliding seat is provided at the bottom edge of the frame, characterized in that, The fan body and the sliding seat are connected by a load-bearing transmission device at the bottom of the fan body as described in any one of claims 1 to 11.

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