CN220639715U

CN220639715U - Multistage gear transmission mechanism, rotating mechanism and ceiling screen

Info

Publication number: CN220639715U
Application number: CN202322206062.5U
Authority: CN
Inventors: 董林杰; 谢刚; 娄烨烽; 邓伟华
Original assignee: Shanghai Wanrou Automotive Electronics Co ltd
Current assignee: Shanghai Wanrou Automotive Electronics Co ltd
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2024-03-22
Anticipated expiration: 2033-08-16

Abstract

The application discloses multistage gear drive mechanism, rotary mechanism and ceiling screen. Wherein multistage gear transmission includes: the worm is used for connecting a motor shaft; a power output shaft for outputting power; a multistage gear set including N gear sets sequentially connected to each other in order between the worm and the power output shaft, N being a natural number of 4 or more and 8 or less; the gear ratio of the multi-stage gearset decreases in the direction from the worm to the power take-off shaft. According to the worm gear, through the arrangement of the worm and the plurality of gear sets, a higher transmission ratio can be realized under a smaller volume, the rotation angle can be accurately controlled, the volume is small, the weight is light, and the production difficulty and the production cost can be effectively reduced; in addition, the structure of the worm turbine can realize a self-locking function, and the aims of protecting the driving motor and the multi-stage gear transmission mechanism are fulfilled.

Description

Multistage gear transmission mechanism, rotating mechanism and ceiling screen

Technical Field

The present application relates to vehicle mounted articles, and in particular to a multi-stage gear drive mechanism, a rotary mechanism and a roof screen.

Background

With the continuous improvement of the living standard of people, the quantity of the private car is increased, and various matched equipment of the private car is also complete. Wherein the vehicle-mounted screen is more and more popular with people.

The vehicle-mounted ceiling screen is widely applied to vehicles such as utility vehicles and recreational vehicles as an entertainment device which is arranged on the top of the vehicle or on the back of a seat and is used for playing multimedia information. The user generally controls the display screen to turn over to open or close through the infrared remote controller, and can control the setting interface through the remote controller, so that the display screen is adjusted to a preset angle gear through keys. The vehicle-mounted ceiling screen is usually rotated by a rotating mechanism connected with a motor to drive the ceiling screen to rotate so as to realize the angle adjustment.

However, the rotation control stability of the existing rotating mechanism of the ceiling screen is insufficient, the transmission is smaller, and the rotating mechanism is often matched with a corresponding friction adjusting mechanism to serve as buffer, so that the whole structure is complex.

Disclosure of Invention

To solve or at least partially solve the above technical problem, a first aspect of the present application provides a multi-stage gear transmission mechanism, comprising:

the worm is used for connecting a motor shaft;

a power output shaft for outputting power;

a multistage gear set including N gear sets sequentially connected to each other in order between the worm and the power output shaft, N being a natural number of 4 or more and 8 or less;

the transmission ratio of the multi-stage gear set is reduced along the direction from the worm to the power output shaft; and, the gear ratio of the multi-stage gear set is set to:

the gear ratio of the 1 st gear set is 5 times greater than the gear ratio of the 2 nd gear set;

the gear ratio of the N-1 stage gear set is 1.2 times greater than that of the N stage gear set;

the difference between the gear ratio of the 2 nd gear set and the gear ratio of the N-1 st gear set is less than 1.

Preferably, N is 5, 6 or 7;

the difference in gear ratios between adjacent gear sets of stages from the 2 nd gear set to the N-2 th gear set is less than 0.1.

Preferably, the gear ratios of the 3 rd and 4 th gear sets are the same.

Further, the gear ratio of the 1 st gear set is 15 to 18, the gear ratio of the nth gear set is 0.9 to 1.5, and the gear ratio of the 2 nd to the N-1 th gear set is 2.1 to 2.73.

Preferably, each gear set comprises two gears, wherein one gear is a driving wheel and is used for being connected with a gear set of a previous stage, and the other gear is a driven wheel and is used for being connected with a gear set of a next stage.

The further technical scheme may be that the gear connected with the worm in the 1 st gear set is a helical gear, and a helical angle on the helical gear is smaller than an equivalent friction angle.

The second aspect of the present application also provides a rotary mechanism comprising:

a driving motor;

the power output mechanism is used for being connected with a load;

the multistage gear transmission mechanism is characterized in that one end of the multistage gear transmission mechanism is connected with the driving motor, and the other end of the multistage gear transmission mechanism is connected with the power output mechanism.

Preferably, the power output mechanism includes:

the rotating piece is provided with an interface for connecting a load;

and the limiting plate is arranged at a position close to the multi-stage gear transmission mechanism and used for limiting the rotation amplitude of the load.

A third aspect of the present application also provides a ceiling screen, comprising:

a main frame;

the rotating mechanism is arranged on the main frame;

and the display screen is rotatably connected to the main frame through the rotating mechanism.

Preferably, the number of the rotating mechanisms is two, and the rotating mechanisms are symmetrically arranged on the main frame left and right and jointly drive the display screen to rotate.

Further technical solution may be that the ceiling screen further includes:

the electronic lock is arranged on the main frame and is used for enabling the rotating mechanism to be self-locking when power is off.

According to the worm gear, through the arrangement of the worm and the plurality of gear sets, a higher transmission ratio can be realized under a smaller volume, the rotation angle can be accurately controlled, the volume is small, the weight is light, and the production difficulty and the production cost can be effectively reduced; in addition, the structure of the worm turbine can realize a self-locking function, and the aims of protecting the driving motor and the multi-stage gear transmission mechanism are fulfilled.

Drawings

In order to more clearly illustrate the embodiments of the present application, a brief description of the associated drawings will be provided below. It is understood that the drawings in the following description are only for illustrating some embodiments of the present application, and that one of ordinary skill in the art can obtain many other technical features and connection relationships not mentioned herein from the drawings.

Fig. 1 is a schematic structural view of a roof screen provided in the present application;

FIG. 2 is a schematic structural view of a rotary mechanism provided in the present application;

FIG. 3 is a schematic view of another angle of the rotary mechanism provided herein;

fig. 4 is a schematic structural diagram of a multi-stage gear transmission mechanism provided in the present application.

Reference numerals and names in the drawings are as follows:

1. a multi-stage gear transmission mechanism; 11. a worm; 12 power output shaft; 13 gear sets; 131 driving wheels; 132 driven wheel;

2. a rotation mechanism; 21. a driving motor; 22. a power take-off mechanism; 23. a rotating member; 24. a limiting plate;

3. a ceiling screen; 31. a main frame; 32. and a display screen.

Detailed Description

The following describes the technical solutions in the embodiments of the present application in detail with reference to the drawings in the embodiments of the present application.

Example 1

To solve the above problem, a first aspect of an embodiment of the present application provides a multi-stage gear transmission mechanism, as shown in fig. 4, including:

the worm is used for connecting a motor shaft;

a power output shaft for outputting power;

A second aspect of an embodiment of the present application provides a rotation mechanism, as shown in fig. 1-3, comprising:

a driving motor;

the power output mechanism is used for being connected with a load;

in the multi-stage gear transmission mechanism in the above embodiment, one end of the multi-stage gear transmission mechanism is connected with the driving motor, and the other end is connected with the power output mechanism.

Specifically, the driving motor is used for rotating a worm in the multi-stage gear transmission mechanism, so that a plurality of gear sets are driven to rotate, and the power output shaft is driven to rotate. The power output shaft is connected to the power output mechanism, and the driving force of the power output shaft can be transmitted to a load connected to the power output mechanism by the power output mechanism.

A third aspect of the embodiments of the present application further provides a ceiling screen, as shown in fig. 1-3, including:

a main frame;

the rotating mechanism described in the above embodiment is provided on the main frame;

Specifically, the display screen is connected with a power output mechanism on the rotating mechanism and can be driven to rotate by the power output mechanism.

The ceiling screen is provided with the rotating mechanism, can realize higher transmission ratio under smaller volume, and has the advantages of precisely controlled rotation angle, small volume and light weight; in addition, the structure of the worm turbine can realize a self-locking function, and the purposes of protecting the driving motor and the rotating mechanism are realized.

In this embodiment, the connection between the driving motor and the plurality of gear sets is realized by using the worm, that is, the driving motor drives the worm to rotate, and the rotating worm drives the first-stage gear set to rotate through the cooperation of the worm and the first-stage gear set, so as to drive the plurality of gear sets to rotate. The worm and the first-stage gear set are matched to realize transmission of driving force. Therefore, the driving motor is connected with the multi-stage gear transmission mechanism through the structure of the worm gear, on one hand, compared with gear transmission, the structure of the worm gear saves more space, has higher transmission ratio, and more effectively transmits the driving force of the driving motor. On the other hand, the structure of the worm gear can obtain accurate and small rotation, and is beneficial to accurately controlling the rotation angle of the power output shaft of the multistage gear transmission mechanism.

In addition, the structure of the worm wheel and the worm can realize a self-locking function, namely, the driving force can only be transmitted to a plurality of gear sets by the driving motor and can not be reversely transmitted. Specifically, the self-locking principle of the worm and the worm gear is based on the action of friction force, friction torque is generated by matching the inclined surface of the worm with the tooth surface of the worm gear, and the transmission torque is converted into the effect of resisting the load torque. In this process, when the direction of the load moment is reversed, the worm wheel will retract along the inclined surface of the worm, so that the reversal can be prevented, and the stability of the transmission direction can be maintained. This enables more accurate control of the rotation angle of the power output shaft of the multi-stage gear transmission mechanism. The power output shaft can not reversely drive the driving motor to rotate, so that the aims of protecting the driving motor and the multi-stage gear transmission mechanism are fulfilled. Compared with the technical scheme of utilizing the friction adjusting mechanism as buffering in the prior art, the structure is simplified by adopting the turbine worm structure, and meanwhile, the energy can be prevented from being dissipated in the friction adjusting mechanism, and the service life of the device is prolonged.

The transmission ratio of the driving gear a and the driven gear b on the gear set is i=ωa/ωb=na/nb, wherein ωa and ωb are the angular speeds (radian/sec) of the gears a and b respectively; na and nb are the rotational speeds (revolutions per minute) of gears a and b, respectively. For a meshed transmission, the gear ratio may be represented by the number of teeth Za and Zb of the a and b wheels, i=zb/Za. The total gear ratio is the product of the gear ratios of the gears of each stage.

In the related art, for a gear set as a speed reducer, a gear ratio thereof is generally set to be large in front and small in rear. This is because the input shaft of the motor has a high rotational speed and a low torque, so that the force acting on the teeth is small and the modulus of the gear can be selected to be small. With the power output shaft, the rotation speed needs to be reduced, and the torque needs to be increased, so that the output force of the gear is increased, and the modulus of the gear can be selected to be larger. Generally speaking, the transmission ratio of each gear can be adjusted as required, so long as the torque range and the installation requirement are satisfied.

In one embodiment, in particular, the gear ratios of the plurality of gear sets decrease sequentially from the direction of connecting the worm to the direction of connecting the power take-off shaft. By this arrangement, the torque of the gear set of the subsequent stage can be made larger than that of the gear set of the preceding stage. With the same transmission ratio, the gear set of the rear stage has thicker tooth thickness and larger mass than the gear set of the front stage. Therefore, by reducing the gear ratio of the next-stage gear set, the number of teeth and the mass of the gears can be correspondingly reduced, thereby reducing the cost and prolonging the service life. Therefore, by adopting the scheme, the multi-gear transmission mechanism has the advantages of large transmission ratio, smaller volume and minimum weight.

In addition, in this patent, the transmission gear train number of having selected 4 to 8 grades for the rotational speed of motor can reach the rotational speed interval that is fit for the ceiling screen after the conversion of gear train, has also taken into account the manufacturing cost of gear train simultaneously.

It is particularly worth mentioning that in this patent the gear ratio of the 1 st gear set is set to be 5 times greater than the gear ratio of the 2 nd gear set. This is because the 1 st gear set is a gear set directly connected to the worm, and a large gear ratio is set in the first gear set, so that the multi-stage gear transmission mechanism can obtain great speed reduction in the first stage, and thus, the subsequent gear pairs can obviously provide the total gear ratio without setting great gear ratios. Meanwhile, in the patent, the transmission ratio of the 2 nd gear set is set to be less than 1 with the transmission ratio of the N-1 st gear set, and the transmission ratio of the N-1 st gear set is set to be 1.2 times greater than the transmission ratio of the N-th gear set, so that the transmission ratio of gears at all levels can be distributed more uniformly, the overlarge difference value of adjacent two levels is avoided, the intermediate shafts at all levels can obtain higher rotating speed and smaller torque, the sizes and the masses of shafts and parts on the shafts are reduced, and the structure is more compact.

The design of each stage of gear set is a comprehensive whole and can not be split. Through the arrangement, the size of the high-speed large gear can be increased, the size difference between the high-speed large gear and the low-speed large gear is reduced, the diameters of the large gears at all levels are easy to adjust to be similar, the oil bath lubrication of the gears at all levels is facilitated, and the phenomenon that the oil immersion depth is too large due to the fact that certain two gears are too large is avoided, and further the oil stirring loss is excessively increased is avoided; meanwhile, after the size of the high-speed pinion is reduced, the peripheral speed of the gears at the high speed and at the rear stages is reduced, noise and vibration are reduced, and the transmission stability is improved; moreover, the final stage transmission ratio can be set smaller, the size and weight of the low-speed large gear and a machine body containing the same are reduced, noise and vibration are reduced, and the transmission stability is improved.

In summary, the multi-stage gear transmission mechanism can realize a higher transmission ratio in a smaller volume through the arrangement of the worm and the plurality of gear sets. The rotating angle of the rotating mechanism can be accurately controlled, the volume is small, the weight is light, and the production difficulty and the production cost can be effectively reduced; in addition, the structure of the worm turbine can realize a self-locking function, and the aims of protecting the driving motor and the multi-stage gear transmission mechanism are fulfilled.

In some embodiments, the power take off mechanism may include:

the rotating piece is provided with an interface for connecting a load;

Through the setting of limiting plate, can restrict the rotation amplitude of load, thereby avoid leading to the load damage because of the load excessive rotation. Specifically, as shown in fig. 3, a limiting plate can interact with a portion of the rotating member to limit the rotation angle of the rotating member and thus the rotation amplitude of the load.

The rotation mechanisms provided in this embodiment may be two, and disposed on the main frame in a left-right manner and jointly drive the display screen to rotate. Like this, set up the rotary mechanism in the display screen both sides respectively can drive the display screen rotation respectively in left and right sides to make the display screen rotate more stably, can effectively avoid leading to the circumstances that the display screen damaged because of the driving force is uneven, preferably, two rotary mechanism symmetry sets up on the main frame, through the symmetrical design especially multistage gear train's symmetrical design, can effectively prevent slow-witted when making rotary mechanism drive rotation.

In other preferred embodiments, the ceiling screen may further comprise:

the electronic lock is arranged on the main frame and is used for enabling the rotating mechanism to be self-locking when power is off. Through the setting of this electronic lock, can be when the outage to rotary mechanism auto-lock for rotary mechanism can not be driven under the effect of external force and rotate after the outage, and then play the purpose of protection display screen and rotary mechanism.

Example two

The present embodiment is a further improvement proposed based on the first embodiment, and the improvement is that:

when N is 5, 6 or 7;

Limiting the number of gear sets to 5 to 7, and in particular 6, may improve reliability in a rotating screen scenario. By further optimizing the gear ratio setting, adjacent gear sets at different levels can have better consistency, so that the overall service life of the device can be better prolonged.

In a further preferred embodiment, the gear ratios of the 3 rd and 4 th gear sets are the same.

The 3 rd gear set and the 4 th gear set are set to be the same transmission ratio, which is beneficial to reducing the volume and ensuring the large transmission ratio under the condition of space allowance. And the gear set at the 3 rd stage and the gear set at the 4 th stage have the same transmission ratio, which means that the gear set at the 3 rd stage and the gear set at the 4 th stage have the same structure and can be produced by adopting the same die, thus further reducing the cost.

In a further preferred embodiment, the gear ratio of the 1 st gear set is 15 to 18, the gear ratio of the nth gear set is 0.9 to 1.5, and the gear ratio of the 2 nd to the N-1 st gear set is 2.1 to 2.73. By providing a larger 1 st and smaller nth gear ratio, the size and weight of the low-speed gear wheel can be reduced, making the reduction gear more compact and lightweight. By setting the smaller gear ratios from the 2 nd stage to the N-1 st stage, the torque and the circumferential speed of the intermediate shaft can be reduced, friction loss and noise are reduced, and the service life of the gear is prolonged. By setting a larger high-speed gear ratio and a smaller low-speed gear ratio, the diameter difference of large gears at each stage can be reduced, so that the large gears are easier to lubricate in an oil bath, and the phenomena of oil stirring loss and overheating are avoided.

In some embodiments, each gear set includes two gears, one of which is a driving wheel for connecting with a gear set of a previous stage, and the other of which is a driven wheel for connecting with a gear set of a next stage. The transmission ratio of each gear set can be conveniently adjusted by the arrangement so as to meet different working conditions and requirements.

In some embodiments, the gear of the 1 st gear set connected to the worm is a helical gear, wherein the helical angle of the helical gear is a degrees, the equivalent friction angle is B degrees, and a is less than B. Generally, the larger the helix angle, the smoother the engagement process, but at the same time increases axial force and friction losses. The larger the helix angle, the larger the axial force component and the higher the bearing requirements. Because A is smaller than B, the bearing capacity and the meshing efficiency of the gear can be increased, the transmission stability and the bearing capacity of the helical gear are improved, and vibration and noise are reduced, so that the high-speed transmission requirement is met.

The first gear set is connected with the worm through a bevel gear, and compared with a traditional worm gear, the worm and bevel gear has obvious advantages in the aspect of processing, manufacturing and detecting, and the transmission effect is better. Compared with bevel gear transmission, the worm bevel gear has obvious advantages in manufacturing, assembling and detecting, and can output a larger transmission ratio in a small space.

On the concrete setting of helical gear, its helix angle is A degree, and equivalent friction angle is B degree, and when A is less than B, turbine worm (i.e. helical gear and worm) can realize auto-lock. Preferably, the helix angle may be 10-15 degrees and the equivalent friction angle 12-20 degrees. In one embodiment, the helix angle may be 12 degrees and the equivalent friction angle 14.5 degrees.

Based on the above embodiment, in the concrete implementation, the multi-stage gear sets respectively adopt the following two groups of configuration modes, the first group adopts six-stage gear sets, and the transmission ratio of the six-stage gear sets is 15, 2.5, 2.45, 2.4, 2.33 and 0.9 in sequence along the direction from the worm to the power output shaft; along the direction from the worm to the power output shaft, the transmission ratio of the second group of six-stage gear sets is 18, 2.73, 2.6, 2.1 and 1.5 in sequence, the transmission ratio of the first group of six-stage gear sets is 466.36, the transmission ratio of the second group of six-stage gear sets is 1045.34, and the self-locking function is realized through the worm and the gear.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A multi-stage gear transmission comprising:

the worm is used for connecting a motor shaft;

a power output shaft for outputting power;

2. The multi-stage gear train of claim 1 wherein,

when the number of gear sets N is 5, 6 or 7;

3. The multi-stage gear train of claim 2 wherein the gear ratios of the 3 rd and 4 th stage gear sets are the same.

4. The multi-stage gear train as set forth in claim 2 wherein,

the gear ratio of the 1 st gear set is 15 to 18, the gear ratio of the N-th gear set is 0.9 to 1.5, and the gear ratio of the 2 nd to N-1 st gear set is 2.1 to 2.73.

5. The multi-stage gear train of claim 1 wherein each gear set includes two gears, one of which is a drive wheel for connecting to a gear set of a previous stage and the other of which is a driven wheel for connecting to a gear set of a next stage.

6. The multi-stage gear train of any one of claims 1 to 5 wherein the gear of the stage 1 gearset connected to the worm is a helical gear having a helix angle less than the equivalent friction angle.

7. A rotary mechanism, comprising:

a driving motor;

the power output mechanism is used for being connected with a load;

a multi-stage gear train according to any one of claims 1 to 6, one end of which is connected to the drive motor and the other end of which is connected to the power take-off mechanism.

8. The rotary mechanism of claim 7, wherein the power take off mechanism comprises:

the rotating piece is provided with an interface for connecting a load;

9. A ceiling screen, comprising:

a main frame;

the rotary mechanism according to claim 7 or 8, provided on the main frame;

10. The overhead screen of claim 9, wherein there are two rotation mechanisms symmetrically disposed on the main frame and jointly drive the display screen to rotate.

11. The overhead screen of claim 9, further comprising: