A drive housing with a very simple structure

Abstract

The application discloses a transmission shell with simple structure, which comprises a transmission assembly and a driving assembly. The transmission assembly comprises a cover plate, a first transmission rod and a second transmission rod slidingly arranged on the cover plate, and a gear shaft for driving the first transmission rod and the second transmission rod to move in the same direction or in the opposite direction. The driving assembly comprises a shell fixed on the cover plate and a driving member rotatingly arranged on the shell. One end of the gear shaft is inserted into the shell and is in transmission connection with the driving member. The axis of the gear shaft is arranged perpendicularly to the axis of the driving member. The single gear shaft can play the role of reversing and the function of simultaneously driving the two transmission rods. The gear shaft can be lengthened to easily evolve the transmission shell with a small center distance into a transmission shell with a large center distance, so that the problem that the internal structure of the traditional transmission shell with a large center distance is relatively complex is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of door and window lock, and particularly relates to a transmission shell with extremely simple structure. BACKGROUND

[0002] In the door and window lock system, the transmission shell is an important existence and is indispensable as a conversion device of different motion forms. In order to realize the opening and closing of the door and window, the handle is usually rotated to drive the transmission shell, and the transmission shell switches the door and window between opening and closing through the linkage of the lock rod and the locking element on the door and window. In the common transmission shell, a plurality of components are used for transmission between the driving assembly and the transmission rod. In particular, in the transmission shell with a larger center distance, more components need to be added or the size of the components needs to be increased to realize the straight-line motion of the transmission rod from the rotation of the handle, which increases the complexity of the structure of the transmission shell. SUMMARY

[0003] The present application aims to overcome the technical defects of the prior art and provide a transmission shell with extremely simple structure. The single gear shaft can not only serve as a reversing device but also drive two transmission rods simultaneously. The gear shaft can be lengthened to easily evolve the transmission shell with a smaller center distance into a transmission shell with a larger center distance, effectively solving the problem of the complex internal structure of the traditional transmission shell with a larger center distance.

[0004] To solve the above technical problems, the present application provides a transmission shell with extremely simple structure, which comprises a transmission assembly and a driving assembly. The transmission assembly comprises a cover plate, a first transmission rod and a second transmission rod slidingly arranged on the cover plate, and a gear shaft for driving the first transmission rod and the second transmission rod to move in the same direction or in the opposite direction. The driving assembly comprises a housing fixed to the cover plate and a driving member rotatingly arranged on the housing. One end of the gear shaft is inserted into the housing and is in transmission connection with the driving member. The axis of the gear shaft is perpendicular to the axis of the driving member.

[0005] Further, one end of the gear shaft is provided with a first gear, and the first transmission rod and the second transmission rod are integrally formed into a transmission rod, and the transmission rod is provided with a first rack in meshing engagement with the first gear.

[0006] Further, one end of the gear shaft is provided with a first gear, one end of the first transmission rod is provided with a first rack in meshing engagement with the first gear, one end of the second transmission rod is provided with a second rack in meshing engagement with the first gear, and the first rack and the second rack are arranged on the two sides of the first gear.

[0007] Further, the other end of the gear shaft is provided with a bevel gear, and the outer periphery of the driving member is provided with a bevel gear tooth in meshing engagement with the bevel gear.

[0008] Further, the other end of the gear shaft is provided with a second gear, the driving member is in transmission connection with the second gear through a sliding member, a sliding groove is concavely arranged on the inner wall of the shell, the sliding member is slidingly arranged in the sliding groove, one side of the sliding member close to the gear shaft is provided with an insertion slot for inserting the gear shaft, and an inner wall of the insertion slot is provided with a plurality of vertical teeth which are arranged along the sliding direction of the sliding member and are spaced apart from each other, and the vertical teeth are in meshing connection with the second gear.

[0009] Further, one side of the sliding member close to the driving member is provided with horizontal teeth which are arranged along the sliding direction of the sliding member and are spaced apart from each other, and the outer periphery of the driving member is provided with a plurality of teeth which are in meshing connection with the horizontal teeth.

[0010] Further, one side of the sliding member close to the driving member is provided with two symmetrical limiting plates which are protruded, the inner side of the limiting plate is provided with a sliding groove which is vertically arranged, the outer periphery of the driving member is provided with a swing arm which is arranged between the two limiting plates, the swing arm is provided with a sliding shaft which is arranged in the sliding groove, and the two ends of the sliding shaft are protruded from the two sides of the swing arm.

[0011] Further, the shell comprises a front shell and a rear shell which are sleeved with each other, the front shell and the rear shell are provided with through holes which are correspondingly arranged in front and back, the two ends of the driving member are rotatably arranged in the through holes, and the middle of the driving member is provided with a polygonal hole; the shell is connected with the cover plate, and the lower end of the shell is provided with a positioning part which is matched with the gear shaft to position the gear shaft.

[0012] Further, the simple transmission shell further comprises a clamping block which is rotatably connected to the cover plate through a screw, and the clamping block is arranged on the outside or the inside of the shell, and the first transmission rod and the second transmission rod are both provided with long strip-shaped holes through which the screw passes.

[0013] Further, the transmission assembly further comprises a fixing plate which is fixedly arranged on the cover plate, the shell is fixedly arranged on the fixing plate, the fixing plate is provided with a through hole through which one end of the gear shaft passes, and one end of the gear shaft is clamped between the fixing plate and the cover plate.

[0014] Further, the fixing plate is provided with a limiting column which is protruded, and one end of the clamping block is in abutting stop connection with the limiting column.

[0015] The present application has the following beneficial effects:

[0016] When the driving piece rotates, the driving piece drives the gear shaft to rotate, and the gear shaft drives the two transmission rods to move linearly, so that the conversion of the movement form from rotation to linear movement is realized, only a single gear shaft can play the role of reversing and the function of driving the two transmission rods at the same time, the overall structure is simple and reliable; when the center distance is relatively large, the driving connection between the driving piece and the two transmission rods can be realized by lengthening the gear shaft, without the need to additionally increase other transmission components to increase the structural complexity, therefore the structure of the present application can easily evolve the transmission shell with smaller center distance into the transmission shell with larger center distance, that is, the longer the gear shaft, the larger the center distance of transmission, effectively solving the problem that the internal structure of the traditional transmission shell with larger center distance is relatively complex.

[0017] Additional aspects and advantages of the present application will be described in the following description, which will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the principles of the present application, and, in which:

[0019] Figure 1 It is an exploded schematic view of the transmission shell in Example 1;

[0020] Figure 2 It is an exploded schematic view of the transmission assembly in Example 1;

[0021] Figure 3 It is an exploded schematic view of the driving assembly in Example 1;

[0022] Figure 4 It is a schematic view of the gear shaft in Example 1;

[0023] Figure 5 It is a schematic view of the driving piece in Example 1;

[0024] Figure 6 It is a side view of the driving piece in Example 1;

[0025] Figure 7 It is a schematic view of the transmission shell in Example 2;

[0026] Figure 8 It is an exploded schematic view of the transmission assembly in Example 2;

[0027] Figure 9 It is an exploded schematic view of the driving assembly in Example 2;

[0028] Figure 10 It is an exploded schematic view of the transmission assembly in Example 3;

[0029] Figure 11 isometric view of the drive housing of Example 4;

[0030] Figure 12 exploded view of the drive housing of Example 4;

[0031] Figure 13 exploded view of the drive assembly of Example 4;

[0032] Figure 14 exploded view of the housing of Example 4;

[0033] Figure 15 cross-sectional view of the drive housing of Example 4 at the gear shaft;

[0034] Figure 16 cross-sectional view of the drive housing of Example 5 at the gear shaft;

[0035] Figure 17 schematic view of the gear shaft of Example 5;

[0036] Figure 18 exploded schematic view of the gear shaft of Example 6;

[0037] Figure 19 exploded schematic view of the gear shaft of Example 7;

[0038] Figure 20 exploded view of the drive housing of Example 8;

[0039] Figure 21 exploded view of the drive assembly of Example 8;

[0040] Figure 22 exploded view of the drive assembly of Example 8;

[0041] Figure 23 schematic view of the drive housing of Example 8 with the front housing removed;

[0042] Figure 24 schematic view of the drive member of Example 8;

[0043] Figure 25 bottom view of the slide member of Example 8;

[0044] Figure 26 cross-sectional view of the slide member of Example 8;

[0045] Figure 27 schematic view of the gear shaft of Example 8;

[0046] Figure 28 exploded view of the drive assembly of Example 8 with the positioning portion;

[0047] Figure 29 This is an exploded schematic diagram of the drive assembly in Example 9;

[0048] Figure 30 is a schematic diagram of the sliding member in Example 9;

[0049] Figure 31 Schematic diagram of the driving member in Example 9. DETAILED DESCRIPTION

[0050] In order to more fully understand the technical content of the present invention, the present invention will be further introduced and explained in conjunction with the accompanying drawings and specific embodiments below; it should be noted that if there are descriptions such as "first" and "second" in the text, they are used to distinguish different components, etc., and do not represent the order of precedence, nor do they limit the "first" and "second" to different types.

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

[0052] Example 1:

[0053] like Figures 1 to 3 As shown, a transmission housing with a very simple structure shown in this embodiment includes a transmission assembly and a drive assembly. The transmission assembly includes a cover plate 1, a first transmission rod 2 and a second transmission rod 3 slidingly arranged on the cover plate 1, and a gear shaft 4 for driving the first transmission rod 2 and the second transmission rod 3 to move in opposite directions, that is, the first transmission rod 2 and the second transmission rod 3 can be driven to move in the same direction or in opposite directions by the gear shaft 4. The drive assembly includes a shell 5 fixed to the cover plate 1 and a drive member 6 rotatably arranged on the shell 5. One end of the gear shaft 4 is inserted into the shell 5 and is in transmission connection with the drive member 6. The drive member is used to connect with an external handle, so that when the handle is rotated, the drive member 6 drives the gear shaft 4 to rotate, and utilizes the gear shaft 4 to rotate with the first transmission rod 2 and the second transmission rod The transmission relationship of the rod 3 drives the first transmission rod 2 and the second transmission rod 3 to perform linear motion, thereby realizing the conversion of the motion form from rotation to linear motion. Only a single gear shaft 4 is needed to play the role of reversing and to drive the two transmission rods at the same time. The overall structure is simple and reliable. When the center distance is relatively large, it is only necessary to lengthen the gear shaft 4 to realize the transmission connection between the driving member 6 and the two transmission rods, without the need to add other transmission components to increase the complexity of the structure. Therefore, the structure of the present invention can easily transform the transmission housing with a smaller center distance into a transmission housing with a larger center distance, that is, the longer the gear shaft 4, the larger the center distance of the transmission, which effectively solves the problem of the relatively complex internal structure of the traditional transmission housing with a larger center distance.

[0054] In the embodiment, as shown in the figure, Figure 2 one end of the gear shaft 4 is provided with a first gear 41, and the end of the gear shaft 4 close to the first gear 41 is provided with a rotating shaft 40 rotating on the cover plate 1, one end of the first transmission rod 2 is provided with a first rack 21 engaging with the first gear 41, and one end of the second transmission rod 3 is provided with a second rack 31 engaging with the first gear 41, and the first rack 21 and the second rack 31 are arranged on the two sides of the first gear 41 respectively, so that the movement strokes of the two racks are staggered with each other, the mutual collision of the two racks during movement can be avoided, and the synchronous movement of the two racks towards each other or in opposite directions can be realized; it can be understood that the first gear 41 can be an integrated structure with the gear shaft 4, or can be a structure assembled and connected together by screws or other fixing means.

[0055] In the embodiment, as shown in the figure, Figure 5 and Figure 6 the other end of the gear shaft 4 is provided with a bevel gear 42, and the outer periphery of the driving member 6 is provided with a bevel gear tooth 61 engaging with the bevel gear 42; preferably, the bevel gear 42 is an integrated structure with the gear shaft 4 (as shown in the figure). Figure 4

[0056] In the embodiment, as shown in the figure, Figure 3 the housing 5 includes a front housing 51 and a rear housing 52 which are sleeved with each other, and the front housing 51 and the rear housing 52 are provided with front and rear corresponding through holes 53, both ends of the driving member 6 are rotatingly arranged in the through holes 53, and the middle of the driving member 6 is provided with a polygonal hole 62, which is preferably a square hole, a triangular hole or a pentagonal hole.

[0057] As a preferred, as shown in the figure, Figure 2 it further includes a clamping block 8 rotatingly connected to the cover plate 1 by a screw 7, and the clamping block 8 is located outside the housing, rotating the screw 7 can drive the clamping block 8 to rotate, so as to clamp and fix the transmission housing on the slot of the door and window profile, and the first transmission rod 2 and the second transmission rod 3 are both provided with a long strip-shaped hole 20 for the screw 7 to pass through.

[0058] As a preferred, as shown in the figure, Figure 2 the transmission assembly further includes a fixing plate 9 fixed to the cover plate, the housing 5 is fixed to the fixing plate 9 by a screw, the fixing plate 9 is provided with a through hole 91 for one end of the gear shaft 4 to pass through, and the other end of the gear shaft 4 is clamped between the fixing plate 9 and the cover plate 1, forming a limiting structure for the gear shaft 4, so that the gear shaft 4 cannot move axially, ensuring the reliability of the transmission connection between the gear shaft 4 and the first transmission rod 2 and the second transmission rod 3.

[0059] As a preferred, as shown in the figure, Figure 2 ​As shown, the fixed plate 9 is provided with a limiting column 92 on the protrusion, and one end of the clamping block 8 is in abutment with the limiting column 92 for stopping, thereby limiting the clamping block 8 from being screwed too much when being unlocked, and facilitating the disassembly of the transmission shell.

[0060] In an embodiment, the anti-ringing block 30 is arranged at the end of the first transmission rod 2 and the second transmission rod 3 away from the rack.

[0061] In an embodiment, the plug 11 is arranged at both ends of the cover plate.

[0062] Embodiment 2:

[0063] The transmission shell shown in this embodiment has a very simple structure, and the overall structure is basically the same as that shown in embodiment 1, except that the clamping block 8 is arranged inside the shell 5, as shown in Figures 7 to 9 As shown, the lower end of the shell 5 is provided with a notch 54 for accommodating the clamping block 8, so compared with the structure in which the clamping block 8 is arranged outside in embodiment 1, the transmission shell in this embodiment can be made shorter, thereby saving the manufacturing cost and the occupied volume.

[0064] Embodiment 3:

[0065] The transmission shell shown in this embodiment has a very simple structure, and the overall structure is basically the same as that shown in embodiment 1, except that, as shown in Figure 10 In the transmission assembly, only one transmission rod 200 is arranged to connect the first transmission rod and the second transmission rod in embodiment 1 to form an integrated structure, and a rack meshing with the gear shaft 4 is arranged in the middle of the transmission rod 200, so when the gear shaft 4 rotates, the transmission rod 200 is driven to move linearly in one direction.

[0066] Embodiment 4:

[0067] The transmission shell shown in this embodiment has a very simple structure, and the overall structure is basically the same as that shown in embodiment 1, except that the transmission shell in this embodiment does not include a fixed plate, as shown in Figures 11 to 15 As shown, the clamping block 8 fixed by the screw 7 is arranged outside the shell 5, and the screw 7 and the clamping block 8 are used to fix the transmission shell on the door and window profile; the shell 5 and the cover plate 1 are fixed by riveting with the rivet 10, the first transmission rod 2 and the second transmission rod 3 are both provided with a long strip-shaped hole for the rivet 10 to pass through, and in order to realize the axial positioning of the gear shaft 4, the lower end of the shell 5 is provided with a positioning portion 55 cooperating with the gear shaft 4 for positioning; specifically, the positioning portion 55 having a semicircular notch 551 is arranged on the front shell 51 and the rear shell 52, and the semicircular notches on the two positioning portions 55 are in abutment to form a circular hole for the one end of the gear shaft 4 to pass through, and the diameter of the circular hole is smaller than the outer diameter of the first gear 41, so as to realize the axial positioning of the gear shaft 4, and ensure the stable meshing connection between the bevel gears and the bevel gear teeth of the driving member during the movement.

[0068] Embodiment 5

[0069] The transmission shell shown in this embodiment has a very simple structure, and its overall structure is basically the same as that shown in Embodiment 4, except that a clamping structure is formed between the gear shaft 4 and the positioning portion 55, as shown in Figure 16 and Figure 17 An annular groove 43 is recessed on the gear shaft 4 above the first gear 41, and the positioning portion 55 is clamped in the annular groove 43. As viewed from Figure 16 above, the circular hole formed by the two semicircular notches clamps the gear shaft 4 and cooperates with the annular groove 43 on the gear shaft 4 to form a rotating connection state, which also limits the axial movement of the gear shaft 4 and ensures that the bevel gears 42 of the gear shaft 4 and the bevel gear teeth 61 of the driving member 6 are stably meshed and connected during movement.

[0070] Embodiment 6

[0071] The transmission shell shown in this embodiment has a very simple structure, and its overall structure is basically the same as that shown in Embodiment 1, except that the structure between the gear shaft 4 and the bevel gear 42 is separated, as shown in Figure 18 A protruding square boss 44 is provided at one end of the gear shaft 4, and a square hole 421 is provided at the center of the bevel gear 42 to be sleeved with the square boss 44. The square boss and the square hole are connected in cooperation, and they are fixed by riveting, but of course they can be assembled and connected together by screws or other fixing methods.

[0072] Embodiment 7

[0073] The transmission shell shown in this embodiment has a very simple structure, and its overall structure is basically the same as that shown in Embodiment 5, except that the structure between the gear shaft 4 and the bevel gear 42 is separated, as shown in Figure 19 A protruding square boss 44 is provided at one end of the gear shaft 4, and a square hole 421 is provided at the center of the bevel gear 42 to be sleeved with the square boss 44. The square boss and the square hole are connected in cooperation, and they are fixed by riveting, but of course they can be assembled and connected together by screws or other fixing methods.

[0074] Embodiment 8

[0075] The transmission shell shown in this embodiment has a very simple structure, and its overall structure is basically the same as that shown in any one of Embodiments 1-7, except that the transmission structure between the gear shaft 4 and the driving member 6 is not the same, as follows:

[0076] Unlike the way of setting the bevel gear on the gear shaft 4 in the previous embodiments, as shown in Figures 20 to 28As shown, in this embodiment, the gear shaft 4 is provided with a second gear 45 at the end away from the first gear 41, the driving member 6 is in transmission connection with the second gear 45 through a sliding member 100, the inner wall of the shell 5 is concavely provided with a sliding groove 56, the sliding member 100 is slidingly arranged in the sliding groove 56, one side of the sliding member 100 close to the gear shaft 4 is provided with an insertion groove 101 for inserting the gear shaft 4, and an inner wall of the insertion groove 101 is provided with a plurality of vertical teeth 102 arranged at intervals along the sliding direction of the sliding member 100, the vertical teeth 102 are in mesh with the second gear 45, when the driving member 6 rotates, the driving member 6 drives the sliding member 100 to move linearly, the sliding member 100 drives the gear shaft 4 to rotate, and the gear shaft 4 drives the first transmission rod 2 and the second transmission rod 3 to move linearly in the same direction or in the opposite direction, so as to realize the conversion of the movement form; it can be understood that the gear shaft 4 can be directly connected by two gear segments with different diameters (as shown in a and b in Figure 27 ), can be two gear segments with different diameters plus an intermediate non-toothed segment (as shown in c and d in Figure 27 ), can be only one whole gear segment with the same diameter (as shown in e in Figure 27 ), can be two gear segments with the same diameter plus an intermediate non-toothed segment (as shown in f in Figure 27 ), but is not limited to the above six structure forms, and the embodiment adopts the structure of c in Figure 27 .

[0077] As shown in Figure 24 and Figure 26 , one side of the sliding member 100 close to the driving member 6 is provided with horizontal teeth 103 arranged at intervals along the sliding direction thereof, and the outer periphery of the driving member 6 is provided with a plurality of teeth 63 in mesh with the horizontal teeth 103.

[0078] Embodiment 9:

[0079] The transmission shell shown in this embodiment has a very simple structure, and the overall structure is basically the same as that of the structure described in embodiment 8, the difference is that the transmission structure between the sliding member 100 and the driving member 6 is not the same, and the specific structure is as follows:

[0080] Unlike the way of setting horizontal teeth on the sliding member in the previous embodiment 8, as shown in Figures 29 to 31As shown, in the embodiment, the one side of the sliding member 100 close to the driving member 6 is provided with two symmetrical limiting plates 104, the inner side of the limiting plate 104 is provided with a vertical sliding slot 105, the outer periphery of the driving member 6 is provided with a swing arm 64 between the two limiting plates 104, and the swing arm 64 is provided with a sliding shaft 65 in the sliding slot 105, and the two ends of the sliding shaft 65 respectively protrude from the two sides of the swing arm 64; in the structure, when the driving member 6 rotates, the sliding shaft 65 slides in the sliding slot 105 on the sliding member, and drives the sliding member 100 to slide in the sliding slot 56 on the shell 5, the movement of the sliding member 100 drives the rotation of the gear shaft 4, and the gear shaft 4 drives the linear movement of the transmission rod, so as to realize the conversion of the movement form.

[0081] The technical solutions provided by the embodiments of the present application are described in detail above, and specific examples are applied in this paper to describe the principles and implementation manners of the embodiments of the present application. The above description of the embodiments is only applicable to help understand the principles of the embodiments of the present application; at the same time, for the general technical personnel in the art, according to the embodiments of the present application, the specific implementation manners and application scope will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A minimalist transmission housing comprising a transmission assembly and a drive assembly, characterized in that, The transmission assembly comprises a cover plate, a first transmission rod and a second transmission rod slidingly arranged on the cover plate, and a gear shaft for driving the first transmission rod and the second transmission rod to move in the same direction or in the opposite direction, the driving assembly comprises a housing fixed to the cover plate and a driving member rotatingly arranged on the housing, one end of the gear shaft is inserted into the housing and is in transmission connection with the driving member, and the axis of the gear shaft is arranged perpendicularly to the axis of the driving member; one end of the gear shaft is provided with a first gear, the other end of the gear shaft is provided with a bevel gear, and the outer periphery of the driving member is provided with a bevel gear tooth meshing with the bevel gear.

2. The structural minimal transmission housing according to claim 1, characterized in that: The first transmission rod and the second transmission rod are integrally formed into a transmission rod, and the transmission rod is provided with a first rack meshing with the first gear.

3. The structural minimal transmission housing of claim 1, wherein: One end of the first transmission rod is provided with a first rack meshing with the first gear, one end of the second transmission rod is provided with a second rack meshing with the first gear, and the first rack and the second rack are arranged on the two sides of the first gear.

4. The minimally structured transmission case of claim 1, wherein: The other end of the gear shaft is provided with a second gear, the driving member is in transmission connection with the second gear through a sliding member, the inner wall of the housing is concavely provided with a sliding groove, the sliding member is slidingly arranged in the sliding groove, one side of the sliding member close to the gear shaft is provided with an insertion slot for inserting the gear shaft, and the inner wall of the insertion slot is provided with a plurality of vertical teeth arranged along the sliding direction of the sliding member and spaced apart from each other, and the vertical teeth are in meshing connection with the second gear.

5. The structural minimal transmission housing of claim 4, wherein: One side of the sliding member close to the driving member is provided with horizontal teeth arranged along the sliding direction of the sliding member and spaced apart from each other, and the outer periphery of the driving member is provided with a plurality of gear teeth meshing with the horizontal teeth.

6. The structural minimal transmission housing of claim 4, wherein: One side of the sliding member close to the driving member is provided with two symmetrical limiting plates protruding therefrom, the inner side of the limiting plate is provided with a sliding groove arranged vertically, the outer periphery of the driving member is provided with a swing arm arranged between the two limiting plates, and the swing arm is provided with a sliding shaft arranged in the sliding groove, and the two ends of the sliding shaft protrude from the two sides of the swing arm.

7. The minimally structured transmission case of claim 1, wherein: The housing comprises a front housing and a rear housing which are arranged in a front-to-rear sleeving manner, and the front housing and the rear housing are provided with front-to-rear corresponding through holes, the two ends of the driving member are rotatably arranged in the through holes, and the middle of the driving member is provided with a polygonal hole; the housing is connected with the cover plate, and the lower end of the housing is provided with a positioning portion cooperating with the gear shaft to position the gear shaft.

8. The minimally structured transmission case of claim 1, wherein: The driving assembly further comprises a clamping block rotatably connected to the cover plate through a screw, and the clamping block is located outside or inside the housing, and the first transmission rod and the second transmission rod are both provided with an elongated hole through which the screw passes.

9. The minimally structured transmission case of claim 1, wherein, The transmission assembly further comprises a fixing plate fixedly arranged on the cover plate, and the housing is fixed to the fixing plate, the fixing plate is provided with a through hole through which one end of the gear shaft passes, and one end of the gear shaft is clamped between the fixing plate and the cover plate.

Images