Large-torque flexible sealed transmission double-wheel vertical driving wheel

Abstract

The invention belongs to the technical field of vertical driving wheels, and discloses a large-torque flexible sealed transmission double-wheel vertical driving wheel which comprises a supporting assembly and further comprises a driving assembly, the driving assembly is installed at the top of the supporting assembly, and the output shaft end of the driving assembly is fixedly connected with a transmission assembly and a wheel. The wheels are arranged on the two sides of the bottom of the supporting assembly and connected with the transmission assembly in a matched mode. Through cooperation of a guide groove, an oil storage tank, a sealing plate and other structures, the lubricating effect on the transmission assembly is improved, the guide groove is formed, so that when a connecting column slides along the track of the guide groove, a limiting block and the sealing plate at the bottom end of the limiting block can be driven to move downwards, and after the sealing plate moves downwards, lubricating oil in the oil storage tank is squeezed; and the operation is repeated, so that the lubricating effect on the transmission assembly is achieved, and then normal operation and work of the double-wheel vertical driving wheel are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of vertical drive wheels, in particular to a large-torque flexible sealed transmission double-wheel vertical drive wheel. Background Art

[0002] High torque flexible sealed transmission dual wheel vertical drive wheel is a specific type of mechanical device, often used in industrial equipment or construction machinery, this drive wheel requires a high torque and high reliability system, such as agricultural vehicles, construction machinery or other mechanical equipment facing high loads.

[0003] For example, the utility model with the publication number CN218316893U discloses an intelligent dual-wheel vertical steering wheel, including a vertical steering wheel assembly, a curved plate is installed at the bottom of the vertical steering wheel assembly, a motor is fixedly connected to one side of the bottom of the curved plate, two wheels are arranged on one side of the motor, one end of the two wheels is fixedly connected, one end of the wheel on one side is fixedly connected to the output end of the motor, and one end of the wheel on the other side is installed with an electromagnetic brake. Through the cooperation of the vertical steering wheel assembly, encoder, gear, curved plate, motor, wheel, electromagnetic brake, housing, straight pipe and oil injection structure, the lubricating oil is poured into the tube body, so that the sponge is full of the lubricating oil, the electric push rod drives the pressure plate to move downward, the pressure plate squeezes the sponge, and the lubricating oil absorbed in the sponge is discharged, the lubricating oil drips from the straight pipe after passing through the filter, and the lubricating oil falls on the gear disc of the vertical steering wheel assembly, and then the lubricating oil is automatically injected, so that the injection of lubricating oil in normal operation is realized, and the work efficiency is improved;

[0004] When the above device is in use, the lubricating oil is dripped onto the gear through a straight pipe, thereby achieving the effect of lubricating the sprocket. However, when the straight pipe is dripping oil, the lubricating oil is often concentrated in a local area above the sprocket, and thus cannot be evenly dispersed to the entire tooth surface. Moreover, if the oil is only dripped from above, the lubricating oil may be lost quickly due to gravity and flow directly to the edge of the sprocket, thereby failing to form a stable oil film on the friction surface of the sprocket, thereby greatly reducing the lubrication effect. Therefore, a large-torque flexible sealed transmission double-wheel vertical drive wheel is proposed. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a large torque flexible sealed transmission double-wheel vertical drive wheel, which has the advantage of improving the lubrication effect on the transmission component.

[0006] To achieve the above object, the present invention provides the following technical solution: a large torque flexible sealed transmission double-wheel vertical drive wheel, including a support assembly, and also including:

[0007] A drive assembly, wherein the drive assembly is mounted on the top of the support assembly, and an output shaft end of the drive assembly is fixedly connected to a transmission assembly;

[0008] Wheels, which are arranged on both sides of the bottom of the support assembly and are cooperatively connected with the transmission assembly;

[0009] A lubrication assembly, the lubrication assembly is fixedly connected to one side of the middle portion of the outer wall of the support assembly, and the lubrication assembly is located above the wheel;

[0010] An oil replenishing assembly, the oil replenishing assembly being movably connected inside the lubricating assembly;

[0011] Among them, the lubrication assembly includes a support frame, one end of the support frame is movably connected to a rotating drum, the bottom of the rotating drum is fixedly connected to a gear plate, the top of the outer wall of the support frame is annularly provided with a guide groove, the top of the support frame is fixedly connected to an oil storage barrel and an oil storage tank, and two nozzles are provided on the side of the oil storage tank close to the transmission assembly.

[0012] Preferably, an oil outlet pipe is fixedly connected to the bottom end of the oil storage barrel on the side close to the oil storage tank, the oil storage barrel is connected to the oil storage tank through the oil outlet pipe, and a circular top cover is provided on the top of the oil storage barrel.

[0013] Preferably, a sealing plate is movably connected inside the oil storage tank, a top end of the sealing plate is fixedly connected to a limiting block, an end of the limiting block close to the rotating drum is fixedly connected to a connecting column, and the connecting column is movably clamped inside the guide groove.

[0014] Preferably, the oil replenishing assembly comprises a round plug, one end of which is fixedly connected to a bevel block, an outer sleeve of the bevel block is provided with a spring, and both ends of the spring are respectively fixedly connected to the round plug and the oil outlet pipe.

[0015] Preferably, a limiting rod is fixedly connected to the bottom of the inner cavity of the oil storage barrel, and the limiting rod consists of a round rod and a cross block. The cross block of the limiting rod is movably clamped in the inside of the round plug, and the inner wall of the round plug is provided with a cross groove that cooperates with the limiting rod.

[0016] Preferably, the end of the inclined block away from the round plug is in a slope shape, the slope end of the inclined block is located inside the oil storage tank, the end of the round plug away from the round plug is in a slope shape, and a rubber gasket is provided on the slope of the round plug.

[0017] Preferably, a slide groove cooperating with the connecting column is formed on the outer wall of the support frame, and the slide groove is used to circumferentially limit the connecting column when the drum rotates. A square groove is formed on the inner wall of the support frame away from the gear plate, and the end of the limit block away from the connecting column moves inside the square groove.

[0018] Preferably, the guide groove is composed of two transverse grooves and two V-shaped grooves connected to each other, the gear plate is meshingly connected with the transmission assembly, the transmission assembly is located inside the support assembly, the gear plate passes through the outer wall of the support assembly and extends to the inside of the support assembly.

[0019] Preferably, the sealing plate is composed of an arc-shaped plate and two round rods, the outer wall of the arc-shaped plate is in contact with the inner wall of the oil storage tank, and the round rods penetrate the top of the oil storage tank and extend to the outside of the oil storage tank.

[0020] Preferably, one end of the nozzle away from the oil storage tank passes through the outer wall of the support assembly and extends to the interior of the support assembly, and a gap is left between one end of the nozzle and the transmission assembly.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention improves the lubrication effect on the transmission component through the cooperation between structures such as the guide groove, the oil storage tank and the sealing plate, thereby preventing the transmission component from excessive wear during operation. By providing the guide groove, the connecting column can drive the limit block and the sealing plate at its bottom end to move downward when sliding along the track of the guide groove. After the sealing plate moves downward, the lubricating oil in the oil storage tank is squeezed, so that the lubricating oil is evenly sprayed onto the transmission component through two nozzles under the action of pressure. This operation is repeated to achieve the lubrication effect on the transmission component, thereby ensuring the normal operation and work of the double-wheel vertical drive wheel.

[0023] The present invention cooperates between structures such as the oil storage barrel, the oil outlet pipe and the spring, so that the lubricating oil can be continuously replenished into the oil storage tank, thereby achieving the effect of continuous spraying. When the sealing plate moves up to release the squeezing of the inclined block, the inclined block will drive the round plug to reset under the action of the spring elastic force, so that the round plug releases the seal on the oil outlet pipe. Subsequently, the lubricating oil inside the oil storage barrel is smoothly transported from the oil storage barrel to the inside of the oil storage tank through the gap between the oil outlet pipe and the round plug, thereby achieving the continuous replenishment of the lubricating oil inside the oil storage tank and achieving the effect of continuous spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the position relationship between the drive assembly, transmission assembly and wheels of the present invention;

[0026] Figure 3 It is a schematic diagram of the positional relationship between the lubrication component and the transmission component of the present invention;

[0027] Figure 4 It is an enlarged structural diagram of the lubrication component of the present invention;

[0028] Figure 5 It is a schematic diagram of the side section structure of the lubrication component of the present invention;

[0029] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0030] Figure 7 It is an exploded view of the oil replenishing assembly of the present invention.

[0031] In the figure: 1. Support assembly; 2. Drive assembly; 3. Transmission assembly; 4. Wheel; 5. Lubrication assembly; 51. Support frame; 52. Rotating drum; 53. Gear plate; 54. Guide groove; 55. Oil storage barrel; 56. Oil storage tank; 57. Oil outlet pipe; 58. Nozzle; 59. Sealing plate; 510. Limit block; 511. Connecting column; 512. Slide; 6. Oil replenishing assembly; 61. Round plug; 62. Bevel block; 63. Spring; 64. Limit rod; 65. Cross groove. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figures 1 to 7 As shown, the present invention provides a large torque flexible sealed transmission double wheel vertical drive wheel, including a support assembly 1, and also includes:

[0034] A driving assembly 2, wherein the driving assembly 2 is mounted on the top of the supporting assembly 1, and the output shaft end of the driving assembly 2 is fixedly connected with the transmission assembly 3;

[0035] Wheels 4, which are arranged on both sides of the bottom of the support assembly 1, and are connected with the transmission assembly 3;

[0036] A lubrication assembly 5, which is fixedly connected to one side of the middle portion of the outer wall of the support assembly 1, and is located above the wheel 4;

[0037] An oil replenishing component 6, which is movably connected to the interior of the lubricating component 5;

[0038] Among them, the lubrication component 5 includes a support frame 51, one end of the support frame 51 is movably connected to a rotating drum 52, the bottom of the rotating drum 52 is fixedly connected to a gear plate 53, the top of the outer wall of the support frame 51 is annularly provided with a guide groove 54, the top of the support frame 51 is fixedly connected to an oil storage barrel 55 and an oil storage tank 56, and two nozzles 58 are arranged on the side of the oil storage tank 56 close to the transmission component 3.

[0039] The above scheme is adopted: by opening a guide groove 54, when the connecting column 511 slides along the track of the guide groove 54, it can drive the limit block 510 and the sealing plate 59 at its bottom end to move downward. After the sealing plate 59 moves downward, the lubricating oil inside the oil storage tank 56 is squeezed, so that the lubricating oil is evenly sprayed onto the transmission component 3 through the two nozzles 58 under the action of pressure, and this operation is repeated, thereby achieving the lubrication effect of the transmission component 3, thereby ensuring the normal operation and work of the two-wheel vertical drive wheel.

[0040] like Figures 4 to 6 As shown, the bottom end of the oil storage barrel 55 close to the oil storage tank 56 is fixedly connected with an oil outlet pipe 57, the oil storage barrel 55 is connected with the oil storage tank 56 through the oil outlet pipe 57, a circular top cover is provided on the top of the oil storage barrel 55, the inside of the oil storage tank 56 is movably connected with a sealing plate 59, the top of the sealing plate 59 is fixedly connected with a limiting block 510, the end of the limiting block 510 close to the rotating drum 52 is fixedly connected with a connecting column 511, and the connecting column 511 is movably clamped in the inside of the guide groove 54.

[0041] The above solution is adopted: a circular top cover is provided at the top of the oil storage barrel 55, so that it is convenient for operators to replenish the lubricating oil inside the oil storage barrel 55, thereby ensuring the normal operation of the device.

[0042] like Figure 6 and Figure 7 As shown, the oil replenishing assembly 6 includes a round plug 61, one end of the round plug 61 is fixedly connected to an inclined block 62, the outer sleeve of the inclined block 62 is provided with a spring 63, the two ends of the spring 63 are respectively fixedly connected to the round plug 61 and the oil outlet pipe 57, the bottom of the inner cavity of the oil storage barrel 55 is fixedly connected to a limiting rod 64, the limiting rod 64 is composed of a round rod and a cross block, the cross block of the limiting rod 64 is movably clamped in the inside of the round plug 61, the inner wall of the round plug 61 is provided with a cross groove 65 that matches the limiting rod 64, the end of the inclined block 62 away from the round plug 61 is in an inclined shape, the inclined end of the inclined block 62 is located in the oil storage tank 56, the end of the round plug 61 away from the round plug 61 is in an inclined shape, and a rubber gasket is provided at the inclined surface of the round plug 61.

[0043] With the above solution, when the sealing plate 59 moves upward to release the squeezing of the inclined block 62, the inclined block 62 will drive the round plug 61 to return to its original position under the action of the elastic force of the spring 63, so that the round plug 61 releases the seal of the oil outlet pipe 57. Subsequently, the lubricating oil in the oil storage barrel 55 is smoothly transported from the oil storage barrel 55 to the oil storage tank 56 through the gap between the oil outlet pipe 57 and the round plug 61, thereby realizing the continuous replenishment of the lubricating oil in the oil storage tank 56 and achieving the effect of continuous spraying.

[0044] A rubber gasket is arranged at the inclined surface of the round plug 61. Its function is that since the rubber gasket has good corrosion resistance and oil resistance, it can resist the chemical substances in the lubricating oil. At the same time, the rubber gasket also has good sealing performance, which can improve the sealing effect of the round plug 61 on the oil outlet pipe 57.

[0045] like Figure 3 and Figure 4 As shown, the outer wall of the support frame 51 is provided with a slide groove 512 that cooperates with the connecting column 511. The slide groove 512 is used to circumferentially limit the connecting column 511 when the drum 52 rotates. The inner wall of the support frame 51 away from the gear plate 53 is provided with a square groove. The end of the limit block 510 away from the connecting column 511 moves inside the square groove. The guide groove 54 is composed of two transverse grooves and two V-shaped grooves connected to each other. The gear plate 53 is meshed and connected with the transmission assembly 3. The transmission assembly 3 is located inside the support assembly 1. The gear plate 53 passes through the outer wall of the support assembly 1 and extends to the inside of the support assembly 1.

[0046] The above scheme is adopted: through the design of the square groove and the slide groove 512, its function is to limit the limit block 510 through the slide groove 512 and the square groove, so that after the connecting column 511 slides into the V-shaped groove of the guide groove 54, it can only drive the limit block 510 to move linearly in the vertical direction, thereby ensuring the stable operation of the device.

[0047] like Figure 4 and Figure 5 As shown, the sealing plate 59 is composed of an arc plate and two round rods. The outer wall of the arc plate fits with the inner wall of the oil storage tank 56. The round rods penetrate the top of the oil storage tank 56 and extend to the outside of the oil storage tank 56. The end of the nozzle 58 away from the oil storage tank 56 penetrates the outer wall of the support assembly 1 and extends to the inside of the support assembly 1. A gap is left between one end of the nozzle 58 and the transmission assembly 3.

[0048] The above scheme is adopted: a gap is left between one end of the nozzle 58 and the transmission component 3. Its function is that since the lubricating oil is sprayed out through the nozzle 58, a gap is left between the nozzle 58 and the transmission component 3, so that the lubricating oil can be sprayed more evenly on the surface of the transmission component 3, thereby forming a thinner and more uniform oil film, thereby improving the lubrication effect.

[0049] The working principle and use process of the present invention are as follows: the driving component 2 transmits power to the two wheels 4 through the transmission component 3, thereby driving the wheels 4 to rotate, thereby providing the device with power for moving forward, backward or turning. While the transmission component 3 rotates at a constant speed, since the transmission component 3 is meshed and connected with the gear plate 53, it will drive the rotating drum 52 to rotate together through the gear plate 53, thereby causing the connecting column 511 to slide along the track of the guide groove 54. While the rotating drum 52 rotates, the connecting column 511 first slides inside the transverse groove of the guide groove 54. When the connecting column 511 slides to the inside of the V-shaped groove of the guide groove 54, the connecting column 511 will drive the limit block 510 to move downward under the action of the circumferential limit of the slide groove 512.

[0050] When the limit block 510 moves downward, it drives the sealing plate 59 to move synchronously, so that the sealing plate 59 abuts against the inclined surface of the inclined block 62. At this time, the circular plug 61 is limited in the horizontal direction by the limit rod 64, so that the sealing plate 59 squeezes the inclined block 62 to drive the circular plug 61 to move horizontally in the direction of the limit rod 64. After the circular plug 61 moves, it drives the rubber gasket at its inclined surface to abut against the inner wall of the oil outlet pipe 57, so that the oil outlet pipe 57 is sealed, and the oil path between the oil storage barrel 55 and the oil storage tank 56 is completely blocked, and the lubricating oil inside the oil storage barrel 55 can no longer pass The oil outlet pipe 57, at the same time, the air pressure inside the oil storage tank 56 also changes, and then the limit block 510 continues to drive the sealing plate 59 to move downward, so that the sealing plate 59 squeezes the lubricating oil inside the oil storage tank 56, and the squeezed lubricating oil is forced to flow into the two nozzles 58 under the action of pressure, and the lubricating oil is evenly sprayed toward the direction of the transmission component 3 through the nozzles 58. Then, the sprayed lubricating oil forms a uniform oil film on the tooth surface of the gear, and this oil film can effectively reduce the friction coefficient of the transmission component 3 during operation, thereby reducing wear and heat generation;

[0051] When the connecting column 511 slides to the bottom end of the V-shaped groove, the rotating drum 52 continues to move, so that the connecting column 511 continues to drive the limit block 510 to move upward along the track of the V-shaped groove, and then drives the sealing plate 59 to move upward. After the sealing plate 59 moves upward, it will release the squeeze on the lubricating oil inside the oil storage tank 56, so that the lubricating oil stops spraying. When the sealing plate 59 moves up to the top of the inner wall of the oil storage tank 56, the sealing plate 59 will release the squeeze on the inclined block 62, so that the round plug 61 is Under the action of the elastic force of the spring 63, the inclined block 62 is driven to reset. After the round plug 61 and the inclined block 62 are reset, the rubber gasket at the inclined surface of the round plug 61 will release the seal of the oil outlet pipe 57, so that the oil path between the oil storage barrel 55 and the oil storage tank 56 is opened. Subsequently, the lubricating oil inside the oil storage barrel 55 flows smoothly into the oil storage tank 56 through the gap between the oil outlet pipe 57 and the round plug 61, thereby achieving the effect of replenishing the lubricating oil inside the oil storage tank 56, and then facilitating the recycling of the device.

[0052] While the device is running continuously, the transmission component 3 will drive the gear plate 53 to rotate continuously until the connecting column 511 slides to the inside of another V-shaped groove, and then the above operation is repeated, so as to continuously spray lubricating oil on different parts of the transmission component 3, thereby achieving the lubrication effect of the transmission component 3, thereby preventing the transmission component 3 from excessive wear after continuous operation, and thus ensuring the normal operation and work of the two-wheel vertical drive wheel.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high torque flexible sealed transmission double wheel vertical drive wheel, comprising a support assembly (1), characterized in that: Also includes: A drive assembly (2), wherein the drive assembly (2) is mounted on the top of the support assembly (1), and the output shaft end of the drive assembly (2) is fixedly connected to the transmission assembly (3); Wheels (4), the wheels (4) being arranged on both sides of the bottom of the support assembly (1), and the wheels (4) being cooperatively connected with the transmission assembly (3); A lubrication assembly (5), wherein the lubrication assembly (5) is fixedly connected to one side of the middle portion of the outer wall of the support assembly (1), and the lubrication assembly (5) is located above the wheel (4); An oil replenishing assembly (6), wherein the oil replenishing assembly (6) is movably connected inside the lubricating assembly (5); The lubrication assembly (5) comprises a support frame (51), one end of the support frame (51) is movably connected to a rotating drum (52), the bottom of the rotating drum (52) is fixedly connected to a gear plate (53), the top end of the outer wall of the support frame (51) is provided with a guide groove (54) in an annular shape, the top of the support frame (51) is fixedly connected to an oil storage barrel (55) and an oil storage tank (56), and two nozzles (58) are provided on a side of the oil storage tank (56) close to the transmission assembly (3).

2. The high torque flexible sealed transmission double wheel vertical drive wheel according to claim 1, characterized in that: The bottom end of the oil storage barrel (55) close to the oil storage tank (56) is fixedly connected with an oil outlet pipe (57), the oil storage barrel (55) is connected with the oil storage tank (56) through the oil outlet pipe (57), and the top end of the oil storage barrel (55) is provided with a circular top cover.

3. The high torque flexible sealed transmission double wheel vertical drive wheel according to claim 1, characterized in that: The oil storage box (56) is movably connected to a sealing plate (59) inside, the top end of the sealing plate (59) is fixedly connected to a limiting block (510), the end of the limiting block (510) close to the rotating drum (52) is fixedly connected to a connecting column (511), and the connecting column (511) is movably clamped inside the guide groove (54).

4. The high torque flexible sealed transmission double wheel vertical drive wheel according to claim 1, characterized in that: The oil replenishing assembly (6) comprises a round plug (61), one end of which is fixedly connected to a bevel block (62), the outer portion of which is sleeved with a spring (63), and the two ends of the spring (63) are respectively fixedly connected to the round plug (61) and the oil outlet pipe (57).

5. The high torque flexible sealed transmission double wheel vertical drive wheel according to claim 4, characterized in that: A limiting rod (64) is fixedly connected to the bottom of the inner cavity of the oil storage barrel (55). The limiting rod (64) is composed of a round rod and a cross block. The cross block of the limiting rod (64) is movably clamped in the interior of the round plug (61). The inner wall of the round plug (61) is provided with a cross groove (65) that matches the limiting rod (64).

6. The high torque flexible sealed transmission double wheel vertical drive wheel according to claim 4, characterized in that: One end of the inclined block (62) away from the round plug (61) is in the shape of an inclined surface, the inclined surface end of the inclined block (62) is located inside the oil storage tank (56), one end of the round plug (61) away from the round plug (61) is in the shape of an inclined surface, and a rubber gasket is provided at the inclined surface of the round plug (61).

7. The high torque flexible sealed transmission double wheel vertical drive wheel according to claim 3, characterized in that: The outer wall of the support frame (51) is provided with a slide groove (512) matched with the connecting column (511), and the slide groove (512) is used to circumferentially limit the connecting column (511) when the rotating drum (52) rotates. The inner wall of the support frame (51) on the side away from the gear plate (53) is provided with a square groove, and one end of the limit block (510) away from the connecting column (511) moves inside the square groove.

8. The high torque flexible sealed transmission double wheel vertical drive wheel according to claim 1, characterized in that: The guide groove (54) is composed of two transverse grooves and two V-shaped grooves connected to each other. The gear plate (53) is meshedly connected with the transmission assembly (3). The transmission assembly (3) is located inside the support assembly (1). The gear plate (53) penetrates the outer wall of the support assembly (1) and extends into the interior of the support assembly (1).

9. The high torque flexible sealed transmission double wheel vertical drive wheel according to claim 3, characterized in that: The sealing plate (59) is composed of an arc-shaped plate and two round rods. The outer wall of the arc-shaped plate fits the inner wall of the oil storage box (56). The round rods penetrate the top of the oil storage box (56) and extend to the outside of the oil storage box (56).

10. The high torque flexible sealed transmission double wheel vertical drive wheel according to claim 1, characterized in that: One end of the nozzle (58) away from the oil storage tank (56) penetrates the outer wall of the support assembly (1) and extends to the interior of the support assembly (1), and a gap is left between one end of the nozzle (58) and the transmission assembly (3).

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