CN114030429A

CN114030429A - Automotive interior ceiling

Info

Publication number: CN114030429A
Application number: CN202111329427.2A
Authority: CN
Inventors: 吕道湖; 马麟; 王伟琦; 许科炳
Original assignee: Ningbo Zhenghai Automobile Interior Parts Co ltd
Current assignee: Ningbo Zhenghai Automobile Interior Parts Co ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-02-11
Anticipated expiration: 2041-11-10
Also published as: CN114030429B

Abstract

The application discloses automotive interior ceiling relates to automotive interior technical field, has improved ceiling layout portion and has taken place to damage the problem that can only whole change after, and it is including being used for installing the ceiling body at top in the car and installing the ceiling cloth on the ceiling body, the ceiling body is used for all having seted up with the both sides that car door is close to mutually and has stored up the cloth groove, the ceiling body is located to store up the cloth inslot and is equipped with the storage cloth device that is used for accomodating the ceiling cloth, it includes to store up the cloth device: the cloth bearing plate is detachably mounted at the groove opening of the cloth storage groove, and a first cloth outlet for ceiling cloth to penetrate through is formed in the cloth bearing plate. This application can be changed the ceiling cloth of local damage through the setting of two storage cloth devices, need not to change whole ceiling cloth, has reduced the cost of changing the ceiling cloth.

Description

Automotive interior ceiling

Technical Field

The application relates to the technical field of automotive interior, in particular to an automotive interior ceiling.

Background

With the improvement of urban traffic roads, more and more people buy automobiles as a means for traveling. In order to improve the aesthetic appearance of the ceiling in the automobile, most car owners can attach a ceiling cloth with a specific pattern to the ceiling, so that the ornamental value of the automobile ceiling can be improved, and the ceiling can be protected.

Because the roof cloth is mostly integrally adhered to the ceiling by adopting glue, when the roof cloth is only locally damaged and the like, a vehicle owner can only take down the whole roof cloth for replacement, which is troublesome and has higher replacement cost.

Disclosure of Invention

In order to improve the problem that the overall replacement can only be carried out after the layout part of the ceiling is damaged, the application provides an automotive interior ceiling.

The application provides an automotive interior ceiling, adopts following technical scheme:

the utility model provides an automotive interior ceiling, is including being used for installing the ceiling body at top in the car and installing the ceiling cloth on the ceiling body, the ceiling body is used for all having seted up with two long sides that car door is close to mutually and stores up the cloth groove, the ceiling body is located stores up the cloth inslot and is equipped with the storage cloth device that is used for accomodating the ceiling cloth, store up the cloth device and include:

the cloth bearing plate is detachably arranged at the notch of the cloth storage groove, and a first cloth outlet through which the ceiling cloth passes is formed in the cloth bearing plate;

the cloth rolling roller is rotatably connected to one side of the cloth bearing plate, which faces the cloth storage groove, and is used for rolling the ceiling cloth;

the cloth pressing plate is rotatably connected to one side of the cloth bearing plate, which is far away from the cloth roller, a second cloth outlet through which the ceiling cloth passes is formed in the cloth pressing plate, and the second cloth outlet is completely staggered with the first cloth outlet;

the adjusting assembly is used for controlling the rotation of the cloth roller;

two ends of the ceiling cloth penetrate through the first cloth outlet and the second cloth outlet and are respectively wound on the cloth storage rollers of the two cloth bearing plates and cover the ceiling body; the cloth storage device also comprises a locking assembly used for fixing the cloth pressing plate when the cloth pressing plate is turned over to abut the ceiling cloth on the cloth bearing plate.

Through adopting above-mentioned technical scheme, when the local emergence of ceiling cloth damaged, remove earlier the fixed to the ceiling cloth, then be close to the cloth roller rolling ceiling cloth of damage position for the ceiling cloth of damage part is received and is drawn into and stores up the cloth groove, compresses tightly the ceiling cloth through the compress board after that, and fixes through the locking Assembly, can accomplish the change of ceiling cloth, and it is comparatively convenient to operate, saves the cost.

Optionally, hold the cloth board and be the cuboid structure, hold the both ends of cloth board length direction and be provided with the connecting plate, the cloth roller includes roll body and the coaxial roller that sets up in the roll body both ends, the cloth roller rotates with two connecting plates through two rollers and is connected.

Optionally, the adjusting part includes the driving gear that is coaxially fixed in two roller, be provided with the storing chamber that supplies the driving gear installation in the connecting plate, hold the spread groove of offering with cavity storing chamber intercommunication at the both ends that the cloth beam kept away from cloth roller one side, the adjusting part still including rotate connect in the spread groove and with driving gear engagement's drive gear, drive gear part stretches out outside the spread groove so that the user dials drive gear.

Through adopting above-mentioned technical scheme, when the user stirred drive gear, can drive the roller rotation through the meshing of drive gear and driving gear for the batching roller rolling or release ceiling cloth, it is comparatively convenient to operate.

Optionally, the first cloth outlet is located in the middle of the cloth bearing plate, two sides of the cloth bearing plate close to the wall of the cloth storage groove are both provided with through grooves vertically communicated with the first cloth outlet, two insertion plates respectively connected with the two through grooves in a sliding manner are symmetrically arranged in the cloth bearing plate, two opposite walls of the cloth storage groove are both provided with insertion grooves for the insertion of the insertion plates, two sides of one end of the two insertion plates close to the insertion groove are both provided with connecting shafts extending towards the connecting groove direction, the wall of the groove close to one side of the connecting groove is provided with limiting through grooves communicated with the connecting groove for the connecting shafts to extend into the connecting groove, the limiting through grooves extend towards the wall of the cloth storage groove, one side of the two driving gears close to each other is circumferentially provided with a ring groove coaxial with the driving gears, and one end of the connecting shaft is connected to the ring groove;

the driving gear is provided with a driving shaft extending along the axis of the driving gear, two opposite groove walls of the connecting groove are respectively provided with a sliding groove extending along the direction vertical to the axis of the driving gear, and two ends of the driving shaft are respectively connected in the two sliding grooves in a rotating manner; when the driving shaft moves to one end of the sliding groove close to the driving gear, the driving gear is meshed with the driving gear; when the driving gear is meshed with the driving gear, two connecting shafts connected with the annular groove of the driving gear are both positioned on the diameter of the driving gear, and one end of the insertion plate extends out of the through groove to be fixedly inserted with the insertion groove; and an elastic part which drives the driving shaft to move upwards all the time to abut against one end, close to the driving gear, of the sliding groove is arranged in the sliding groove.

By adopting the technical scheme, when the cloth bearing plate needs to be detached, the drive gear is pulled down, so that the two connecting shafts drive the insertion plate to move towards the direction close to the cloth outlet along the track of the ring groove, the insertion plate is separated from the insertion groove, and the detachable connection between the cloth bearing plate and the cloth storage groove is realized.

Optionally, the elastic element is a spring installed in the sliding groove, a sliding block used for abutting against the driving shaft is connected to the sliding groove in a sliding mode, one end of the spring is connected with the sliding block, the other end of the spring is connected with one end, far away from the driving gear, of the sliding groove, and the spring drives the sliding block to push the connecting shaft to abut against one end, close to the driving gear, of the sliding groove all the time.

Through adopting above-mentioned technical scheme, adopt the spring as elastic component, have simple structure, the stable advantage of atress.

Optionally, the locking assembly includes a locking bolt, one end of the cloth pressing plate is provided with a mounting hole for the locking bolt to pass through, and one side of the cloth bearing plate, which is away from the cloth roller, is provided with a threaded hole for the locking bolt to be in threaded connection; when the cloth pressing plate is turned to abut against the ceiling cloth in the direction of the cloth bearing plate, the threaded holes and the mounting holes are located at the same axial position.

Through adopting above-mentioned technical scheme, when the compress board orientation holds the direction upset of cloth board to when supporting the ceiling cloth, pass mounting hole and the downthehole locking of screw in threaded hole with the locking bolt, can realize the fixed of compress board, it is comparatively convenient to operate.

Optionally, two ends of the cloth pressing plate close to one side of the cloth bearing plate are both provided with hidden grooves for the driving gear to enter; when the cloth pressing plate is fixed on the cloth bearing plate, the driving gear is positioned in the hidden groove of the cloth pressing plate.

Through adopting above-mentioned technical scheme, hide the setting in groove, can effectually prevent that the user from stirring drive gear, have the effect of preventing the maloperation.

Optionally, an arc-shaped groove matched with the driving shaft is formed in one side, close to the driving shaft, of the sliding block, and a plurality of resistance reducing balls are uniformly distributed in the arc-shaped groove.

Through adopting above-mentioned technical scheme, the frictional resistance between drive shaft and the drag reduction ball can be reduced in the setting of drag reduction ball.

In summary, the present application includes at least one of the following benefits:

1. by arranging the two cloth storage devices, the locally damaged ceiling cloth can be replaced without replacing the whole ceiling cloth, so that the cost for replacing the ceiling cloth is reduced;

2. the arrangement of the driving gear and the driving gear can facilitate a user to drive the cloth roller to rotate.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

fig. 2 is a schematic structural view of the ceiling body of the present embodiment;

FIG. 3 is an exploded view of the cloth bearing plate of the present embodiment;

FIG. 4 is a schematic cross-sectional view of the first fabric outlet of the present embodiment;

FIG. 5 is a schematic structural diagram of a drive gear according to the present embodiment;

FIG. 6 is a schematic structural diagram of a hidden slot in the present embodiment;

FIG. 7 is a schematic structural view of the embodiment embodying the ring groove;

fig. 8 is a schematic structural diagram of the slider according to the present embodiment.

Description of reference numerals: 1. a ceiling body; 2. a ceiling cloth; 3. a cloth storage tank; 4. a cloth bearing plate; 5. a cloth roller; 511. a roller body; 512. a roll shaft; 6. a cloth pressing plate; 7. a connecting plate; 8. a first cloth outlet; 9. a second cloth outlet; 10. a driving gear; 11. a storage chamber; 12. connecting grooves; 13. a drive gear; 14. a through groove; 15. a plugboard; 16. inserting grooves; 17. a connecting shaft; 18. a limiting through groove; 19. a ring groove; 20. a drive shaft; 21. a chute; 22. a slider; 23. a spring; 24. an arc-shaped slot; 25. a drag reducing ball; 26. a locking bolt; 27. mounting holes; 28. a threaded hole; 29. the slot is hidden.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses automotive interior ceiling. Referring to fig. 1 and 2, the automotive interior ceiling includes a ceiling body 1 and a ceiling cloth 2 attached to the ceiling body 1. The whole cuboid structure that is of ceiling body 1, and both long sides of ceiling body 1 have all been seted up and have been stored up cloth storage tank 3, store up cloth storage tank 3 and extend along ceiling body 1's length direction, all install in two cloth storage tanks 3 and store up the cloth device, and can accomodate respectively in storing up the cloth device at the both ends of ceiling cloth 2.

Referring to fig. 2 and 3, the cloth storage device comprises a cloth bearing plate 4, a cloth roller 5 and a cloth pressing plate 6, wherein the cloth bearing plate 4 is detachably mounted at the notch of the cloth storage groove 3 and plugs the notch of the cloth storage groove 3. The cloth holding plate 4 is provided with the connecting plates 7 towards one side of the cloth storage groove 3 and along the two ends of the cloth holding plate 4 in the length direction, the cloth roller 5 comprises a roller body 511 and roller shafts 512 coaxially arranged at the two ends of the roller body 511, and the two roller shafts 512 of the cloth roller 5 are respectively connected with the two connecting plates 7 in a rotating manner.

Referring to fig. 4 and 5, one end of the cloth pressing plate 6 is rotatably connected to the side, away from the connecting plate 7, of the cloth bearing plate 4, and the cloth pressing plate 6 can rotate around the rotation center to the position attached to the cloth bearing plate 4. The middle part of the cloth bearing plate 4 is provided with a first cloth outlet 8 extending along the length direction of the cloth bearing plate 4, the cloth pressing plate 6 is provided with a second cloth outlet 9, the second cloth outlet 9 is positioned at one end of the cloth pressing plate 6 far away from the rotation center, and the positions of the first cloth outlet 8 and the second cloth outlet 9 are completely staggered. One end of the ceiling cloth 2 can be wound on the cloth roller 5, and the other end of the ceiling cloth extends out of the first cloth outlet 8 and the second cloth outlet 9 in sequence, then covers the lower end face of the ceiling body 1, and is wound on the other cloth roller 5.

Referring to fig. 5 and 6, the cloth storage device further includes an adjustment assembly for a user to control the rotation of the cloth roller 5. Specifically, the adjusting assembly includes two driving gears 10 respectively welded to the two roller shafts 512. The connecting plate 7 is provided with a storage cavity 11, and the driving gear 10 is positioned in the storage cavity 11. Hold 4 length direction's of cloth board both ends and all offer the spread groove 12 with storing chamber 11 intercommunication, adjusting part still includes two drive gear 13, two drive gear 13 rotate respectively and connect in two spread grooves 12, and form the meshing with driving gear 10, and drive gear 13's partly stretches out outside spread groove 12, make the user can stir drive gear 13 rotatory, make drive gear 13 drive driving gear 10 rotatory with cloth roller 5, thereby realize the rolling and the release of top canopy cloth 2.

Referring to fig. 6 and 7, in order to realize the detachable connection between the cloth bearing plate 4 and the cloth storage groove 3, the middle parts of the two long sides of the cloth bearing plate 4 are provided with a through groove 14 communicated with the first cloth outlet 8, two insertion plates 15 are arranged in the cloth bearing plate 4, the two insertion plates 15 are respectively connected in the two through grooves 14 in a sliding manner, the cloth storage groove 3 is relatively provided with insertion grooves 16 for the insertion plates 15 to be inserted into, the insertion plates 15 can partially slide out of the through grooves 14 to form insertion connection with the insertion grooves 16, and thus the cloth bearing plate 4 is fixed.

Further, two ends of two plugboards 15 close to one side are all provided with connecting shaft 17 extending towards drive gear 13, and the spacing logical groove 18 that communicates with spread groove 12 is seted up to the cell wall that leads to groove 14, and spacing logical groove 18 extends along plugboard 15's slip direction. The two driving gears 13 are provided with a ring groove 19 for inserting the connecting shaft 17 at one side close to each other, and the ring groove 19 and the driving gears 13 are coaxially arranged. When the driving gear 13 is meshed with the driving gear 10, the distance between the two connecting shafts 17 in the ring groove 19 is farthest, and the two connecting shafts are on the diameter of the driving gear 13, and one end of the insertion plate 15 is inserted into the insertion groove 16.

Referring to fig. 6 and 7, a driving shaft 20 is coaxially disposed on the driving gear 13, two groove walls of the connecting groove 12 are provided with sliding grooves 21 extending vertically toward the roller shaft 512, and two ends of the driving shaft 20 are rotatably connected to the two sliding grooves 21 and can slide along the sliding grooves 21. When the driving shaft 20 slides in a direction away from the driving gear 10, the two connecting shafts 17 located in the ring grooves 19 move along the tracks of the ring grooves 19, so that the two inserting plates 15 move in a direction approaching to each other, so that the inserting plates 15 are received in the through grooves 14 and separated from the inserting grooves 16, and the cloth bearing plate 4 can be taken out of the cloth storage groove 3. When the driving shaft 20 moves to abut against the end of the slide groove 21 close to the roller shaft 512, the driving gear 13 is engaged with the driving gear 10.

Referring to fig. 6 and 7, the slide slot 21 is provided with an elastic member for always driving the driving shaft 20 to move upward until the driving gear 13 is engaged with the driving gear 10. Specifically, the slide 22 is slidably connected to the slide groove 21, and the slide 22 can slide along the longitudinal direction of the slide groove 21. The elastic component is a spring 23 installed in the sliding chute 21, one end of the spring 23 is fixedly connected with the sliding block 22, and the other end of the spring is fixedly connected with one end of the sliding chute 21 far away from the roller shaft 512. The drive shaft 20 abuts the side of the slider 22 remote from the spring 23. The spring force of the spring 23 acting on the slider 22 without the external force can cause the slider 22 to push the drive shaft 20 to move against the end of the slide groove 21 close to the roller shaft 512, and the drive shaft 20 can be kept in a state of abutting against the upper end groove wall of the slide groove 21.

Further, referring to fig. 6 and 8, an arc-shaped groove 24 adapted to the driving shaft 20 is formed in one side of the sliding block 22 close to the side away from the spring 23, and a plurality of resistance reducing balls 25 are uniformly distributed in the arc-shaped groove 24 and used for reducing resistance of the driving shaft 20 during rotation.

Referring to fig. 6 and 7, the cloth storage device further comprises a locking assembly for fixing the cloth pressing plate 6, and when the cloth pressing plate 6 is turned over towards the direction of the cloth bearing plate 4 until the ceiling cloth 2 is abutted against the cloth bearing plate 4, the locking assembly can fix the cloth pressing plate 6.

Specifically, referring to fig. 6 and 7, the locking assembly includes a locking bolt 26, a mounting hole 27 for the locking bolt 26 to pass through is formed in the cloth pressing plate 6, the mounting hole 27 is located at one end of the cloth pressing plate 6 far away from the rotation center, and a threaded hole 28 for the locking bolt 26 to be screwed is formed in the cloth bearing plate 4. When the cloth pressing plate 6 is turned over to the state that the ceiling cloth 2 is abutted against the cloth bearing plate 4, the mounting hole 27 and the threaded hole 28 are located at the same axial line position, and at the moment, the locking bolt 26 penetrates through the mounting hole 27 and is screwed into the threaded hole 28, so that the fixation of the cloth pressing plate 6 can be realized.

Referring to fig. 6 and 7, in order to prevent the user from operating the driving gear 13 by mistake, a hidden groove 29 for the driving gear 13 to enter is formed on the cloth pressing plate 6 near the cloth receiving plate 4. When the cloth pressing plate 6 is turned over until the ceiling cloth 2 is pressed against the cloth bearing plate 4, the driving gear 13 is hidden in the hidden groove 29, and the user can only rotate the driving gear 13 after the cloth pressing plate 6 is opened.

The implementation principle of the automotive interior ceiling of the embodiment of the application is as follows:

when the local damage of the ceiling cloth 2 occurs, the cloth roller 5 which is close to the damaged position is driven to roll the ceiling cloth 2, so that the damaged position of the ceiling cloth 2 is rolled into the cloth storage groove 3 to be fixed, and the replacement of the ceiling cloth 2 can be realized.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an automotive interior ceiling, is including being used for installing ceiling body (1) at the roof in the car and installing ceiling cloth (2) on ceiling body (1), its characterized in that: ceiling body (1) is used for all having seted up storage cloth groove (3) with the two long sides that car door is close to mutually, ceiling body (1) is located and is equipped with the storage cloth device that is used for accomodating ceiling cloth (2) in storing up cloth groove (3), store up the cloth device and include:

the cloth bearing plate (4) is detachably mounted at the notch of the cloth storage groove (3), and a first cloth outlet (8) through which the ceiling cloth (2) passes is formed in the cloth bearing plate (4);

the cloth rolling roller (5) is rotatably connected to one side, facing the cloth storage groove (3), of the cloth bearing plate (4) and is used for rolling the ceiling cloth (2);

the cloth pressing plate (6) is rotatably connected to one side, away from the cloth roller (5), of the cloth bearing plate (4), a second cloth outlet (9) for the ceiling cloth (2) to pass through is formed in the cloth pressing plate (6), and the second cloth outlet (9) is completely staggered with the first cloth outlet (8);

the adjusting component is used for controlling the rotation of the cloth roller (5);

wherein, two ends of the ceiling cloth (2) pass through the first cloth outlet (8) and the second cloth outlet (9) and are respectively wound on the cloth storage rollers of the two cloth bearing plates (4) and covered on the ceiling body (1); the cloth storage device also comprises a locking assembly for fixing the cloth pressing plate (6) when the cloth pressing plate (6) is turned over to enable the ceiling cloth (2) to be tightly abutted to the cloth bearing plate (4).

2. The automotive interior ceiling of claim 1, characterized in that: hold cloth board (4) and be the cuboid structure, hold cloth board (4) length direction's both ends and be provided with connecting plate (7), cloth roller (5) include roll body (511) and coaxial setting in roll shaft (512) at roll body (511) both ends, cloth roller (5) rotate with two connecting plate (7) through two roll shaft (512) and are connected.

3. The automotive interior ceiling of claim 2, characterized in that: adjusting part is including the driving gear (10) that the coaxial two roller (512) that are fixed in, be provided with storing chamber (11) that supply driving gear (10) to install in connecting plate (7), hold both ends that cloth beam (4) kept away from cloth roller (5) one side and offer spread groove (12) with cavity storing chamber (11) intercommunication, adjusting part still connects in spread groove (12) and with driving gear (10) meshed drive gear (13) including rotating, drive gear (13) part stretches out outside spread groove (12) so that the user dials drive gear (13).

4. The automotive interior ceiling of claim 3, characterized in that: the cloth storage device is characterized in that the first cloth outlet (8) is positioned in the middle of the cloth bearing plate (4), through grooves (14) vertically communicated with the first cloth outlet (8) are formed in two sides of the cloth bearing plate (4) close to the wall of the cloth storage groove (3), two insertion plates (15) which are respectively in sliding connection with the two through grooves (14) are symmetrically arranged in the cloth bearing plate (4), insertion grooves (16) for the insertion of the insertion plates (15) are formed in two opposite walls of the cloth storage groove (3), connecting shafts (17) extending towards the direction of the connecting grooves (12) are arranged on two sides of one end of the two insertion plates (15) close to each other, limiting through grooves (18) communicated with the connecting grooves (12) to allow the connecting shafts (17) to extend into the connecting grooves (12) are formed in the wall of one side of the through grooves (14) close to the connecting grooves (12), and the limiting through grooves (18) extend towards the wall of the cloth storage groove (3), a ring groove (19) coaxial with the driving gear (13) is formed in the circumferential direction of one side, close to the two driving gears (13), and one end of the connecting shaft (17) is connected to the ring groove (19);

a driving shaft (20) extending along the axis of the driving gear (13) is arranged on the driving gear (13), sliding grooves (21) extending in the direction perpendicular to the axis of the driving gear (10) are formed in two opposite groove walls of the connecting groove (12), and two ends of the driving shaft (20) are respectively connected in the two sliding grooves (21) in a rotating mode; when the driving shaft (20) moves to one end of the sliding groove (21) close to the driving gear (10), the driving gear (13) is meshed with the driving gear (10); when the driving gear (13) is meshed with the driving gear (10), two connecting shafts (17) connected with a ring groove (19) of the driving gear (13) are both positioned on the diameter of the driving gear (13), and one end of the insertion plate (15) extends out of the through groove (14) to be inserted and fixed with the insertion groove (16); the sliding groove (21) is internally provided with an elastic piece which always drives the driving shaft (20) to move upwards to abut against one end of the sliding groove (21) close to the driving gear (10).

5. The automotive interior ceiling of claim 4, wherein: the elastic part is a spring (23) installed in the sliding groove (21), a sliding block (22) used for abutting against the driving shaft (20) is connected in the sliding groove (21) in a sliding mode, one end of the spring (23) is connected with the sliding block (22), the other end of the spring is connected with one end, far away from the driving gear (10), of the sliding groove (21), and the spring (23) drives the sliding block (22) to push the connecting shaft (17) to abut against one end, close to the driving gear (10), of the sliding groove (21) all the time.

6. The automotive interior ceiling of claim 5, wherein: the locking assembly comprises a locking bolt (26), one end of the cloth pressing plate (6) is provided with a mounting hole (27) for the locking bolt (26) to pass through, and one side of the cloth bearing plate (4) departing from the cloth roller (5) is provided with a threaded hole (28) for the locking bolt (26) to be in threaded connection; when the cloth pressing plate (6) is turned to abut against the ceiling cloth (2) towards the direction of the cloth bearing plate (4), the threaded hole (28) and the mounting hole (27) are in a coaxial position.

7. The automotive interior ceiling of claim 6, characterized in that: two ends of one side of the cloth pressing plate (6) close to the cloth bearing plate (4) are provided with hidden grooves (29) for the driving gear (13) to enter; when the cloth pressing plate (6) is fixed on the cloth bearing plate (4), the driving gear (13) is positioned in a hidden groove (29) of the cloth pressing plate (6).

8. The automotive interior ceiling of claim 5, wherein: an arc-shaped groove (24) matched with the driving shaft (20) is formed in one side, close to the driving shaft (20), of the sliding block (22), and a plurality of resistance reducing balls (25) are uniformly distributed in the arc-shaped groove (24).