CN220488265U - Electronic gear shifter with dial knob - Google Patents

Abstract

The utility model provides an electronic gear shifter with a dial knob, which belongs to the technical field of gear shifters and comprises: the toggle assembly comprises a toggle and an operating lever, the toggle is arranged at the upper end of the operating lever, at least one rotating shaft part is arranged at the lower end of the operating lever, the operating lever is provided with an elastic piece and a bullet head, and the bullet head is connected with the elastic piece; the lower part of the control rod stretches into the base assembly and is hinged with the base assembly through the rotating shaft part, a curved surface block is fixedly arranged in the base assembly, the bullet head and the elastic piece are both positioned in the base assembly, the curved surface block is positioned above the bullet head, and the elastic piece applies a jacking force towards the curved surface block to the bullet head and enables the bullet head to always contact with the curved surface block; the beneficial effects of the utility model are as follows: the control lever rotates by taking the lower end of the control lever as a pivot, the bullet head is positioned above the pivot, the curved surface block is positioned above the bullet head, the structure is very compact and reasonable, and the operation hand feeling is better.

Description

Electronic gear shifter with dial knob

Technical Field

The utility model belongs to the technical field of gear shifters, and relates to an electronic gear shifter with a dial knob.

Background

With the development of passenger car technology, the performance of automobiles is more and more excellent, and the performance and functions of automobile products and parts are also becoming mature. Because of the superior operability of electronic shifters, the electronic shifters have been in the mainstream position in the market, more and more vehicle enterprises have set the electronic shifters as the preferred configurations of new vehicle types, and consumers are also more suitable for the shifting forms of the electronic shifters.

The existing electronic gear shifter has push rod type, knob type, button type, toggle button type and other styles. The shift button type electronic gear shifter is used for adjusting the gear by pushing the shift button, for example, the utility model patent with the application number of CN202110712464.5 is named as the shift button type electronic gear shifter, but the structure of the gear shifter is not compact enough and has a certain improvement space.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provides an electronic gear shifter with a pulling button.

The aim of the utility model can be achieved by the following technical scheme: an electronic shifter with a dial knob, comprising:

the dial assembly comprises a dial and an operating rod, the dial is arranged at the upper end of the operating rod, at least one rotating shaft part is arranged at the lower end of the operating rod, an elastic piece and a bullet head are arranged on the operating rod, and the bullet head is connected with the elastic piece;

the lower part of the operating lever stretches into the base assembly and is hinged with the base assembly through the rotating shaft part, a curved surface block is fixedly arranged in the base assembly, the bullet head and the elastic piece are both positioned in the base assembly, the curved surface block is positioned above the bullet head, and the elastic piece applies a jacking force towards the curved surface block to the bullet head and enables the bullet head to always contact with the curved surface block.

Preferably, the operating lever comprises a mounting seat and a rocker arm, the dial button is mounted at the upper end of the mounting seat, the lower end of the mounting seat is fixedly connected with the rocker arm, the rocker arm is located in the base assembly, the rotating shaft portion is located at the lower end of the rocker arm, and the rocker arm is hinged with the base assembly through the rotating shaft portion.

Preferably, the rocker arm is provided with a side bracket part, the side bracket part is provided with a mounting groove, the mounting groove is positioned below the curved surface block, the notch of the mounting groove faces the curved surface block, the elastic piece and the bullet head are both positioned in the mounting groove, and the end part of the bullet head stretches out of the notch of the mounting groove under the action of the elastic piece.

Preferably, the circuit board is fixedly arranged in the base assembly, the circuit board is provided with a Hall element, one rotating shaft part is connected with a magnet, and the magnet is close to the Hall element.

Preferably, the mounting seat is provided with a light-emitting element, the dial knob and the light-emitting element are arranged up and down correspondingly, and the dial knob is a transparent piece.

Preferably, the curved surface block is of a reverse U-shaped structure, the curved surface block is provided with a gear curved surface positioned above the bullet head, the bullet head is in abutting connection with the gear curved surface and can slide along the gear curved surface, the gear curved surface is provided with at least two groove parts arranged along the sliding stroke of the bullet head, and gear shifting handfeel is generated when the bullet head slides to the groove parts.

Preferably, the top surface of the base assembly is provided with a limit groove extending along the moving direction of the pulling button, the mounting seat is provided with a limit block, a part of the limit block is inserted into the limit groove, the limit block is contacted with two side surfaces of the limit groove, and the limit block slides in the limit groove when the operating lever rotates around the rotating shaft part.

Preferably, the portable electronic device further comprises a shell and a panel, wherein the panel is covered on the shell, the base assembly is fixed in the shell, the mounting seat is positioned in the shell and fixedly connected with an arc shielding plate, the panel is provided with an open slot, the poking button is positioned in the open slot and can move in the open slot, the arc shielding plate is shielded below the open slot, the wall part around the open slot bends towards the arc shielding plate, and the bottom surface of the wall part is close to the upper surface of the arc shielding plate.

Preferably, the housing has a lower opening from which the base assembly fits into the housing.

Preferably, the base assembly comprises a base and an upper cover, wherein the upper cover is connected with the base, a U-shaped groove is formed in the bottom of the upper cover, the U-shaped groove and the base form a shaft hole, and the rotating shaft is connected with the shaft hole.

Compared with the prior art, the utility model has the beneficial effects that:

1. the control lever rotates by taking the lower end of the control lever as a pivot, the bullet head is positioned above the pivot, the curved surface block is positioned above the bullet head, the structure is very compact and reasonable, and the operation hand feeling is better.

2. Because the toggle button is positioned at the top end of the control rod, and the rotating fulcrum is positioned at the bottom end of the control rod, the bullet head and the curved surface block for providing gear shifting hand feeling are positioned at the middle part of the control rod, the hand feeling of the toggle button when toggling is very good, and the gear shifting is smoother.

3. The side support part is used for installing an elastic piece and a bullet, wherein the elastic piece is inserted into the installation groove, the bullet can be installed in the installation groove in a jumping manner (moving along the axial direction of the installation groove), the elastic piece is in abutting connection with the bullet, and the bullet is sprung up and contacted with the curved surface block under the action of the elastic piece; since the side bracket part and the rocker arm are integrated, when the rocker arm swings, the bullet positioned in the side bracket part also moves together, and the end part of the bullet slides on the curved surface block to provide gear shifting feel.

4. The bottom of dialling the button and the top fixed connection of mount pad and aim at light emitting component, thereby light is dialled the button to light-emitting component light-emitting time to produce the luminous efficacy for this is dialled the button and is had luminous effect.

5. The shaft hole part is not of a fixed structure, but is formed by assembling a U-shaped groove and a base, so that the rocker arm and the base assembly can be conveniently assembled.

Drawings

FIG. 1 is a schematic view of a joystick assembly of the present utility model.

Fig. 2 is a schematic diagram of the positions of the bullet and the curved block according to the present utility model.

FIG. 3 is an exploded view of the dial assembly and base assembly of the present utility model.

Fig. 4 is a schematic view of the installation position of the rotating shaft part of the present utility model.

Fig. 5 is a schematic structural view of a curved block and a side bracket portion according to the present utility model.

Fig. 6 is a schematic structural view of the rocker arm of the present utility model.

Fig. 7 is a schematic view of the internal structure of the electronic shifter of the present utility model.

Fig. 8 is a schematic structural view of a curved block according to the present utility model.

Fig. 9 is a schematic diagram of an electronic shifter of the present utility model.

100, a dial button; 200. a joystick; 210. a rotating shaft portion; 220. a magnet; 230. a mounting base; 231. a light emitting element; 232. a limiting block; 233. an arc-shaped shielding plate; 240. a rocker arm; 250. a side bracket part; 251. a mounting groove; 300. an elastic member; 400. bullet heads; 500. a curved surface block; 510. a gear curved surface; 520. a groove portion; 600. a base assembly; 610. a circuit board; 620. a Hall element; 630. a limit groove; 640. a base; 650. an upper cover; 651. a U-shaped groove; 700. a housing; 710. a lower opening; 800. a panel; 810. an open slot.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1 to 9, an electronic shifter with a dial knob includes: the device comprises a dial assembly and a base assembly 600, wherein the dial assembly comprises a dial 100 and an operating lever 200, the dial 100 is arranged at the upper end of the operating lever 200, at least one rotating shaft part 210 is arranged at the lower end of the operating lever 200, the operating lever 200 is provided with an elastic piece 300 and a bullet head 400, and the bullet head 400 is connected with the elastic piece 300; the lower part of the operating lever 200 is extended into the base assembly 600 and hinged with the base assembly 600 through the rotating shaft part 210, the curved block 500 is fixedly arranged in the base assembly 600, the bullet 400 and the elastic member 300 are both positioned in the base assembly 600, the curved block 500 is positioned above the bullet 400, and the elastic member 300 applies a jacking force towards the curved block 500 to the bullet 400 and enables the bullet 400 to always contact with the curved block 500.

The pulling button 100 is installed at the top end of the operating lever 200, the operating lever 200 can rotate by taking the rotating shaft part 210 at the bottom end of the operating lever as a fulcrum, the bullet 400 is positioned at any position from the top end to the bottom end of the operating lever 200, so that the pulling button 100 and the bullet 400 are positioned at the same side of the rotating fulcrum, the curved surface block 500 is positioned above the bullet 400, and the elastic piece 300 pushes the screwdriver bullet 400 so that the end part of the bullet 400 is always contacted with the curved surface block 500; when the shift operation is performed, the shift knob 100 is pushed, the shift knob 100 rotates by the operating lever 200 with the rotating shaft portion 210 as a fulcrum, and the bullet 400 and the shift knob 100 move in the same direction, and the bullet 400 and the curved block 500 provide a feel at the time of shift.

In the existing gear shifter with the shift knob 100, the shift knob 100 and the bullet 400 are respectively located at two sides of the rotation fulcrum, that is, the movement direction of the shift knob 100 is opposite to the movement direction of the bullet 400, and the curved block 500 (gear shifting groove) is located below the bullet 400, that is, the bullet 400 and the curved block 500 in the conventional gear shifter are arranged from top to bottom, so that the structure is not compact, and the operating lever 200 is long, and the occupied space is large.

In the electronic gear shifter, the bullet 400 and the curved block 500 are arranged from bottom to top, the operating lever 200 can rotate by taking the rotating shaft part 210 at the lower end of the operating lever as a pivot, and the space for installing the bullet 400 is not required to be reserved below, so the operating lever 200 can be arranged relatively short, the space for installing the curved block 500 is not required to be reserved below, and the bullet 400 is jacked up from below and contacted with the curved block 500, so that the structure is very compact, and the space in the base assembly 600 is effectively utilized.

Since the toggle 100 is located at the top end of the lever 200 and the rotation fulcrum is located at the bottom end of the lever 200, the bullet 400 and the curved block 500 providing the shift feel are located in the middle of the lever 200, so that the toggle 100 has very good feel when toggling, and is smoother when shifting gears.

The operating lever 200 rotates with the lower end as a pivot, the bullet 400 is positioned above the pivot, the curved block 500 is positioned above the bullet 400, the structure is very compact and reasonable, and the operation hand feeling is better.

As shown in fig. 1 to 7, the lever 200 includes a mounting seat 230 and a swing arm 240, the dial 100 is mounted on the upper end of the mounting seat 230, the lower end of the mounting seat 230 is fixedly connected with the swing arm 240, the swing arm 240 is located in the base assembly 600, the pivot portion 210 is located on the lower end of the swing arm 240, and the swing arm 240 is hinged with the base assembly 600 through the pivot portion 210.

In this embodiment, the lever 200 is composed of an upper part and a lower part, the mounting base 230 is used for mounting the toggle 100, the rocker arm 240 is hinged with the base assembly 600 to realize a rotation function, the top end of the mounting base 230 is of a platform structure, the lower end of the mounting base 230 is rod-shaped and is inserted into the rocker arm 240, and the two parts are fixedly connected through a screw, and the rotating shaft part 210 is located at the side part of the lower end of the rocker arm 240, so that the mounting base 230 can rotate around the rotating shaft part 210.

On the basis of the above embodiment, the rocker arm 240 has the side bracket portion 250, the side bracket portion 250 is provided with the mounting groove 251, the mounting groove 251 is located below the curved surface block 500 and the notch thereof faces the curved surface block 500, the elastic member 300 and the bullet 400 are both located in the mounting groove 251 and the end of the bullet 400 protrudes from the notch of the mounting groove 251 under the action of the elastic member 300.

The side bracket part 250 is a side part of the rocker 240, and the side bracket part 250 is used for installing the elastic member 300 and the bullet 400, wherein the elastic member 300 is inserted into the installation groove 251, the bullet 400 is installed in the installation groove 251 in a jumping manner (moving along the axial direction of the installation groove 251), and the elastic member 300 is in abutting connection with the bullet 400, and the bullet 400 is sprung up and contacted with the curved block 500 under the action of the elastic member 300; since the side bracket part 250 is integral with the swing arm 240, the bullet 400 located in the side bracket part 250 moves together when the swing arm 240 swings, and the end of the bullet 400 slides on the curved block 500 to provide a shift feel.

As shown in fig. 1 to 5, in the above embodiment, the circuit board 610 is fixedly disposed in the base assembly 600, the circuit board 610 is provided with the hall element 620, the magnet 220 is connected to the spindle portion 210, and the magnet 220 is close to the hall element 620.

The number of the rotating shaft portions 210 is two and are respectively located at the left side and the right side of the rocker arm 240, one rotating shaft portion 210 is connected with the magnet 220, the circuit board 610 is located at one side of the rocker arm 240, the magnet 220 is located in the sensing area of the hall element 620, when the dial 100 is dialed, the rocker arm 240 is driven to rotate, the magnet 220 is rotated, and the hall element 620 senses the magnetic field angle change of the magnet 220, so that a corresponding voltage signal is output.

As shown in fig. 1 and 7, in the above embodiment, the mount 230 is provided with a light emitting element 231, the dial 100 is provided vertically corresponding to the light emitting element 231, and the dial 100 is a transparent member.

The knob 100 has a light emitting effect, the knob 100 is made of crystal or acrylic, the crystal or acrylic has good light transmittance, the top end of the mounting seat 230 is of a platform structure and is provided with a light emitting element 231, the light emitting element 231 is preferably an LED element, the bottom end of the knob 100 is fixedly connected with the top end of the mounting seat 230 and is aligned to the light emitting element 231, and light rays are emitted to the knob 100 when the light emitting element 231 emits light so as to generate light effects, so that the knob 100 has the light emitting effect.

As shown in fig. 1 to 5 and fig. 8, based on the above embodiment, the curved block 500 has a "-n" structure, the curved block 500 has a gear curved surface 510 located above the bullet 400, the bullet 400 is in abutting connection with the gear curved surface 510 and can slide along the gear curved surface 510, the gear curved surface 510 has at least two groove portions 520 arranged along the sliding stroke of the bullet 400, and a shift feel is generated when the bullet 400 slides to the groove portions 520.

In an example, the curved block 500 is clamped on the inner side surface of the base assembly 600, two ends of the curved block 500 are fixedly connected with the base assembly 600, the top of the curved block 500 is located above the bullet 400, the lower surface of the top of the curved block 500 is a gear curved surface 510, the bullet 400 can slide on the gear curved surface 510 when the dial 100 is dialed, and the bullet 400 slides into the corresponding groove 520 when the dial 100 is located in each gear, so that a shifting feel is formed.

As shown in fig. 1 and 3, on the basis of the above embodiment, the top surface of the base assembly 600 is provided with a limiting groove 630 extending along the movement direction of the dial knob 100, the mounting seat 230 is provided with a limiting block 232, a part of the limiting block 232 is inserted into the limiting groove 630, the limiting block 232 contacts with two side surfaces of the limiting groove 630, and the operating lever 200 rotates around the shaft portion 210 to limit the sliding of the block 232 in the limiting groove 630.

In an example, the knob 100 is preferably moved back and forth, that is, the rocker arm 240 and the mounting seat 230 can swing back and forth, and in order to limit the freedom degrees of the rocker arm 240 and the mounting seat 230 in the left-right direction, a limit groove 630 is specifically provided on the top surface of the base assembly 600 (the upper cover 650), and the limit block 232 of the mounting seat 230 is inserted into the limit groove 630, so that not only the knob 100 can be guided to be moved back and forth, but also the left-right movement of the knob 100 can be limited.

As shown in fig. 1-5, 7 and 9, the present utility model further includes a housing 700 and a panel 800, wherein the panel 800 covers the housing 700, the base assembly 600 is fixed in the housing 700, the mounting seat 230 is located in the housing 700 and is fixedly connected with the arc-shaped shielding plate 233, the panel 800 is provided with an opening groove 810, the dial 100 is located in the opening groove 810 and can move in the opening groove 810, the arc-shaped shielding plate 233 is shielded below the opening groove 810, the wall around the opening groove 810 is bent towards the arc-shaped shielding plate 233, and the bottom surface of the dial is close to the upper surface of the arc-shaped shielding plate 233.

The walls around the opening 810 are square and close to form the opening 810, so the opening 810 has a certain depth, the arc shielding plate 233 is covered under the opening 810, and the arc shielding plate 233 completely covers under the opening 810 no matter the toggle 100 is moved to any position. The bottom surface of the square frame structure is closely attached to the upper surface of the arc-shaped shielding plate 233, so that a gap between the two is very small, thereby preventing dust or foreign matter from entering the housing. During shifting, the mount 230 moves to move with the arcuate shutter 233, during which the arcuate shutter 233 always covers the underside of the open slot 810.

It should be further noted that, the arc-shaped shielding plate 233 is an arc-shaped structure with the rotation shaft portion 210 as the center, and the bottom surfaces of two sides of the square frame structure (the wall portion around the opening slot 810) are inner arc surfaces, so that the top surface of the arc-shaped shielding plate 233 can be pressed close to, and the rotation of the arc-shaped shielding plate 233 is not hindered, in short, the bottom surface of the wall portion side contour around the opening slot 810 is inner arc-shaped, so as to match the contour of the arc-shaped shielding plate 233, and the movement of the arc-shaped shielding plate 233 is not hindered.

As shown in fig. 1 to 9, the case 700 has a lower opening 710, and the base assembly 600 is fitted into the case 700 through the lower opening 710.

In the above embodiment, the base assembly 600 includes the base 640 and the upper cover 650, the upper cover 650 is connected to the base 640, the U-shaped groove 651 is provided at the bottom of the upper cover 650, the U-shaped groove 651 and the base 640 form a shaft hole, and the rotation shaft portion 210 is connected to the shaft hole.

The electronic gear shifter has the advantages of ingenious structure and convenient installation; specifically, the shaft hole is not a fixed structure, but is formed by assembling the U-shaped groove 651 with the base 640, thereby facilitating assembly of the swing arm 240 with the base assembly 600.

During specific assembly, the mounting seat 230 and the rocker arm 240 are fixed together through screws, the elastic piece 300 and the bullet 400 are sequentially arranged in the mounting groove 251, the rotating shaft part 210 at the lower end of the rocker arm 240 is clamped in the U-shaped groove 651, then the base 640 and the upper cover 650 are fixed together, at the moment, the rotating shaft part 210 is limited in the shaft hole part, so that the poking button assembly can poke forwards and backwards, and meanwhile, the two ends of the curved surface block 500 are fixedly connected with the base 640; the base assembly 600 and the toggle assembly are then installed into the housing 700 from below along the lower opening 710, and the base 640 is secured to the housing 700.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to herein as "first," "second," "a," and the like are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

Claims (10)

1. An electronic shifter having a dial knob, comprising:

the dial assembly comprises a dial (100) and an operating rod (200), wherein the dial (100) is arranged at the upper end of the operating rod (200), at least one rotating shaft part (210) is arranged at the lower end of the operating rod (200), an elastic piece (300) and a bullet head (400) are arranged on the operating rod (200), and the bullet head (400) is connected with the elastic piece (300);

the base assembly (600), the lower part of control lever (200) stretches into in base assembly (600) and through pivot portion (210) with base assembly (600) is articulated, base assembly (600) internal fixation is provided with curved surface piece (500), bullet head (400) with elastic component (300) all are located in base assembly (600), curved surface piece (500) are located the top of bullet head (400), elastic component (300) to bullet head (400) are exerted towards the jacking force of curved surface piece (500) and are made bullet head (400) all the time with curved surface piece (500) contact.

2. An electronic shifter with a toggle button as set forth in claim 1, wherein: the control rod (200) comprises a mounting seat (230) and a rocker arm (240), the poking button (100) is mounted at the upper end of the mounting seat (230), the lower end of the mounting seat (230) is fixedly connected with the rocker arm (240), the rocker arm (240) is located in the base assembly (600), the rotating shaft part (210) is located at the lower end of the rocker arm (240), and the rocker arm (240) is hinged with the base assembly (600) through the rotating shaft part (210).

3. An electronic shifter with a toggle button as set forth in claim 2, wherein: the rocker arm (240) is provided with a side support portion (250), the side support portion (250) is provided with a mounting groove (251), the mounting groove (251) is located below the curved surface block (500) and the notch of the mounting groove faces the curved surface block (500), the elastic piece (300) and the bullet head (400) are located in the mounting groove (251), and the end portion of the bullet head (400) stretches out of the notch of the mounting groove (251) under the action of the elastic piece (300).

4. An electronic shifter with a toggle button as set forth in claim 1, wherein: the base assembly (600) is internally and fixedly provided with a circuit board (610), the circuit board (610) is provided with a Hall element (620), one rotating shaft part (210) is connected with a magnet (220), and the magnet (220) is close to the Hall element (620).

5. An electronic shifter with a toggle button as set forth in claim 1, wherein: the mounting seat (230) is provided with a light-emitting element (231), the poking button (100) and the light-emitting element (231) are arranged up and down correspondingly, and the poking button (100) is a transparent piece.

6. An electronic shifter with a toggle button as set forth in claim 3, wherein: the curved surface block (500) is of a reverse U-shaped structure, the curved surface block (500) is provided with a gear curved surface (510) positioned above the bullet head (400), the bullet head (400) is in abutting connection with the gear curved surface (510) and can slide along the gear curved surface (510), the gear curved surface (510) is provided with at least two groove parts (520) arranged along the sliding stroke of the bullet head (400), and the bullet head (400) generates gear shifting handfeel when sliding to the groove parts (520).

7. An electronic shifter with a toggle button as set forth in claim 2, wherein: the top surface of base assembly (600) is provided with along dialling spacing groove (630) that button (100) direction of motion extends, mount pad (230) are provided with stopper (232), the part of stopper (232) inserts in spacing groove (630), stopper (232) with the both sides face contact of spacing groove (630), control lever (200) are around during pivot portion (210) rotation stopper (232) are in slide in spacing groove (630).

8. An electronic shifter with a toggle button as set forth in claim 2, wherein: still include casing (700) and panel (800), panel (800) lid is in on casing (700), base assembly (600) are fixed in casing (700), mount pad (230) are located in casing (700) and fixedly connected with arc shutter (233), open slot (810) have been seted up to panel (800), dial button (100) are located open slot (810) and can be in remove in open slot (810), arc shutter (233) shelter from in the below of open slot (810), wall portion around open slot (810) towards arc shutter (233) are buckled and its bottom surface is pressed close to the upper surface of arc shutter (233).

9. An electronic shifter with a toggle button as set forth in claim 1, wherein: the housing (700) has a lower opening (710), and the base assembly (600) is fitted into the housing (700) from the lower opening (710).

10. An electronic shifter with a toggle button as set forth in claim 1 or 9, wherein: the base assembly (600) comprises a base (640) and an upper cover (650), wherein the upper cover (650) is connected with the base (640), a U-shaped groove (651) is formed in the bottom of the upper cover (650), the U-shaped groove (651) and the base (640) form a shaft hole, and the rotating shaft part (210) is connected with the shaft hole.