CN210662075U

CN210662075U - Cam and cam component of vehicle-mounted display

Info

Publication number: CN210662075U
Application number: CN201920864952.6U
Authority: CN
Inventors: 何木灵
Original assignee: Hangzhou Hangzheng Electronic Technology Co ltd
Current assignee: Hangzhou Hangzheng Electronic Technology Co ltd
Priority date: 2019-06-10
Filing date: 2019-06-10
Publication date: 2020-06-02
Anticipated expiration: 2029-06-10

Abstract

A cam and a cam component of a vehicle-mounted display aim to solve the technical problem that an angle positioning mechanism of the vehicle-mounted display in the prior art is complex. The utility model discloses a cam of vehicle-mounted display, cam profile curved surface is the ring shape along the axial projection of cam, is equipped with closing area, opening area and crossing limit district on the profile curve, is equipped with transition zone between closing area and the opening area, and the other end of opening area links to each other with the one end of crossing limit district, and the other end of crossing limit district is connected with the self-locking district, and the cam includes high-order and low level, and the high-order is in opening the district, and the low level is in closing the district; the cam assembly of the vehicle-mounted display is characterized in that a cam is sleeved on a rotating shaft, a transverse sliding block is arranged on the rotating shaft, one end of the transverse sliding block is provided with a contact end, the contact end is attached to a contour curved surface of the cam, the other end of the transverse sliding block is connected with one end of an elastic piece sleeved on the rotating shaft, and the other end of the elastic piece is abutted to an adjusting block arranged on the rotating shaft. Has the advantages that: the cam assembly can realize automatic positioning of the display.

Description

Cam and cam component of vehicle-mounted display

Technical Field

The utility model relates to a vehicle-mounted display field especially relates to a vehicle-mounted display's cam and cam subassembly.

Background

The vehicle-mounted display is divided into two types, one is a small-size vehicle-mounted display, the other is a television which is placed on a passenger car for watching, and the other is a vehicle-mounted television essentially; the utility model discloses an application scenario emphasizes on vehicle-mounted television. At present, a vehicle-mounted television becomes necessary equipment of a middle-distance and long-distance passenger car, effectively relieves the boring atmosphere of the space in the car, and becomes an important tool for eliminating the wear time of middle-distance and long-distance passengers. In order to facilitate the viewing of passengers, the car television is often installed in a passageway, but this may affect the getting on and off of passengers to some extent, and therefore, the existing car television is designed as an openable and closable mechanism. When the passenger car is positioned at the station, the vehicle-mounted television is folded and attached to the ceiling of the passenger car; when the passenger car runs, the vehicle-mounted television is turned on. After the vehicle-mounted television is rotated and opened, the vehicle-mounted television needs to be fixed at a proper angle so as to be convenient for passengers to watch, and the positioning of the rotation angle through what structure is important.

Chinese patent No. CN 206694399U discloses a rotating shaft device and a display bracket, which includes a rotating shaft with an end cap at one end, a fixed bracket, a locking member, a fixed cam, a rotating cam and an elastic member; the other end of the rotating shaft sequentially penetrates through the elastic piece, the rotating cam, the fixed cam and the fixed bracket and is connected with the locking piece; the rotating cam is meshed with the fixed cam, the fixed cam is fixedly connected with the fixed support, the rotating shaft drives the rotating cam to rotate when rotating, and the rotating cam drives the fixed cam and the fixed support to rotate simultaneously.

In the above-mentioned patent, the rotating cam meshes with fixed cam mutually, and the peak and the millet of rotating cam are corresponding with the peak and the millet of fixed cam respectively, and fixed cam and fixed bolster looks fixed connection drive the rotating cam when the pivot rotates and rotate, and the rotating cam drives fixed cam and fixed bolster and rotates simultaneously, after rotatory certain angle, can automatic sliding return under the effect of rotating cam and fixed cam, need not the manual work and rotate the playback again.

Above-mentioned utility model can realize carrying out turned angle's 0~180 spacing to the vehicle TV through engaged with rotating cam and fixed cam to can realize automatic playback. However, the european community market requires E-MARK certification for both automobiles and their safety parts according to the european union directive (EEC) and the european economic commission Regulation (ECE Regulation); for the display for the passenger car, the related authentication standards stipulate that the display in a viewing state can rotate at a small angle along the load direction after being impacted by the load; when the head of the passenger carelessly hits the display, the display is separated from the head of the passenger under the action of the collision load, so that the head of the passenger is prevented from being damaged due to hard collision. Above-mentioned utility model carries out the spacing back of corner to the vehicle-mounted television, and the vehicle-mounted television is fixed, can't take place the small-angle skew under the effect of collision load, therefore the passenger is hard collision rather than the collision between them, and the passenger is injured very easily.

In addition, in order to ensure riding comfort of passengers, the seats of the middle-long coach are designed in an inclined mode, and the best angle for watching by eyes is that the sight line is basically vertical to a vehicle-mounted television screen; the optimal included angle range between the vehicle television and the ceiling is about 110 degrees when the vehicle television is in a stable opening state by taking the inclination angle of the seat into consideration. For example, chinese patent No. CN 102734614B discloses a foldable display support frame, which includes: the screen support is used for fixing a screen, at least one pivoting part is arranged at the lower end of the screen support, and a limiting part is arranged on the pivoting part; the base is provided with a pivoting seat; the supporting arm is provided with at least one upper pivoting part and at least one lower pivoting part, the upper pivoting part is pivoted with the pivoting part of the screen support through an upper rotating shaft, the lower pivoting part is pivoted with the pivoting seat of the base through a lower rotating shaft, and the side edge of the supporting arm is provided with at least one linkage mechanism for linking the upper rotating shaft and the lower rotating shaft; the upper rotating shaft comprises a mandrel, a first cam, a second cam, a limiting piece and a first elastic assembly, wherein the first cam, the second cam, the limiting piece and the first elastic assembly are sleeved on the mandrel, the first cam and the second cam are respectively provided with at least one lug, the limiting piece is provided with a stopping part, and the stopping part and the limiting part of the screen support can be mutually stopped to limit the screen to rotate within a first angle range; when the supporting arm rotates through the lower rotating shaft, the linkage mechanism is linked with the first cam and the second cam to rotate relatively, when the lug of the first cam is in contact with the lug of the second cam to push, the second cam can move axially and pushes the limiting piece to enable the stopping part to leave the limiting part of the screen support, and the screen can rotate within a second angle range.

The utility model provides a foldable display support frame, when the support frame is unlocked and unfolded from a folded state, the screen rotates to a specific angle to form positioning, and particularly, the support frame can also realize positioning at about 110 degrees through micro-adjustment of a component; but the corner positioning mechanism of the utility model is very complex, and the fault tolerance of the mechanism is low.

Disclosure of Invention

The utility model discloses an overcome the more complicated technical problem of angle positioning mechanism of vehicle-mounted display among the prior art, provide a vehicle-mounted display's cam pack, elastic component and regulating block cooperation among the cam pack can carry on spacingly to the turned angle of cam, and when the contact jaw of horizontal sliding block and the district's contact of opening of cam profile curved surface, vehicle-mounted display just can automatic positioning to the best angle of vwatching, need not additional positioning mechanism.

In order to achieve the above purpose, the present invention adopts the following technical solution.

The utility model provides a cam of vehicle-mounted display, cam profile curved surface is the ring shape along the axial projection of cam, be equipped with on the profile curve and close the district, open the district and cross the limit district, close the district and open and be equipped with the transition district between the district, the other end in district of opening links to each other with the one end of crossing the limit district, the other end of crossing the limit district is connected with the auto-lock district, the cam includes high-order and low level, the high-order is opening the district, the low-order is closing the district, there is the difference in height along the cam axial between high-order and the low level.

The projection of the cam profile curved surface along the axial direction of the cam is a circular ring profile curve, wherein the inner ring of the cam can be sleeved on the rotating part, so that the cam is driven by the rotating part to integrally rotate. The cam in the technical scheme is applied to the vehicle-mounted display, the closing area corresponds to the initial closing state of the vehicle-mounted display, the opening area corresponds to the watching state of the vehicle-mounted display, and the self-locking area corresponds to the overturning closing state of the vehicle-mounted display.

Preferably, the peripheral angle distribution of the closing area is 0-5 degrees, the peripheral angle distribution of the transition area is 5-80 degrees, the peripheral angle distribution of the opening area is 80-130 degrees, the peripheral angle distribution of the over-limit area is 130-170 degrees, and the peripheral angle distribution of the self-locking area is 170-180 degrees.

When the vehicle-mounted display is in an initial closed state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 0-5 degrees, and a corresponding peripheral angle of a closed area is 0-5 degrees; the vehicle-mounted display reaches a viewing state after rotating 75 degrees, the rotating process corresponds to a transition area on the cam, and the corresponding circumferential angle is 5-80 degrees; when the vehicle-mounted display is in a watching state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 80-130 degrees, and a corresponding peripheral angle of an opening area is 80-130 degrees; the vehicle-mounted display continues to rotate by 40 degrees and then reaches a turning and closing state, the rotating process corresponds to an over-limit area on the cam, and the corresponding peripheral angle is 130-170 degrees; when the vehicle-mounted display is in a turning closed state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 170-180 degrees, and a corresponding circumferential angle of the self-locking area is 170-180 degrees. The areas on the cam correspond to the position states of the vehicle-mounted display one by one, and the position states of the vehicle-mounted display can be adjusted by adjusting the circumferential angle distribution of the areas on the cam profile curve. The utility model discloses an above-mentioned technical scheme makes vehicle-mounted display rotate specific angle and can form the location automatically.

Preferably, the profile curves of the cams are arranged in a centrosymmetric manner.

As can be seen from the foregoing description, the position state change requirement of the vehicle-mounted display from the initial closed state to the viewing state and then to the turnover closed state can be met by partitioning the circumferential angle of 0-180 degrees on the cam profile curve; however, the one-sided rotation structure is unstable, and the positional accuracy of the in-vehicle display is greatly reduced once the cam is worn. In the utility model, the contour curve of the cam is designed to be centrosymmetric, and the position state of the vehicle-mounted display is determined by the same centrosymmetric region on the cam; specifically, when the vehicle-mounted display is in an initial closed state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 0-5 degrees, and corresponding peripheral angles of a closed area are 0-5 degrees and 180-185 degrees; the vehicle-mounted display reaches a viewing state after rotating 75 degrees, the rotating process corresponds to a transition area on the cam, and the corresponding peripheral angle is 5-80 degrees and 185-260 degrees; when the vehicle-mounted display is in a watching state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 80-130 degrees, and corresponding peripheral angles of an opening area are 80-130 degrees and 260-310 degrees; the vehicle-mounted display continues to rotate by 40 degrees and then reaches a turning and closing state, the rotating process corresponds to an over-limit area on the cam, and the corresponding peripheral angles are 130-170 degrees and 310-350 degrees; when the vehicle-mounted display is in a turning closed state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 170-180 degrees, and a corresponding peripheral angle of the self-locking area is 170-180 degrees and 350-360 degrees. When the vehicle-mounted display is in any position state, two centrosymmetric same-structure areas on the cam are aligned for positioning, and the position precision of the vehicle-mounted display is greatly improved.

Preferably, the cam contour curved surface is projected along the axial vertical direction of the cam, the corresponding curve of the over-limit area is continuous with the corresponding curve position of the self-locking area, the curvature radius of each point on the corresponding curve of the over-limit area is smaller than that of each point on the corresponding curve of the self-locking area, and the corresponding curves of the rest areas are in smooth transition.

The cam contour curved surface is projected along the axial vertical direction of the cam, the corresponding curve of the over-limit area is continuous with the corresponding curve position of the self-locking area, the curvature radius of each point on the corresponding curve of the over-limit area is smaller than that of each point on the corresponding curve of the self-locking area, and the vehicle-mounted display needs to be driven by a larger external load when the vehicle-mounted display enters a turning closed state from a viewing state; based on this, after the vehicle-mounted display enters the upset closed condition, the vehicle-mounted display will be injectd in the range of 170~180 with the vibration contained angle between the vehicle ceiling under the effect of less vibration load to form the auto-lock phenomenon under the less vibration load. When the vehicle-mounted display is collided in an opening state, due to smooth transition among corresponding curves of other areas, the vehicle-mounted display rotates and deviates under the action of collision load, partial reaction load is dissipated, and passengers cannot be damaged when colliding with the vehicle-mounted display, so that relevant regulations of E-MARK are met.

The utility model provides a cam assembly of vehicle-mounted display, the cam suit is in the pivot, is equipped with the transverse sliding block in the pivot, and the one end of transverse sliding block is equipped with the contact jaw, and the profile curved surface on the contact jaw laminating cam, the other end of transverse sliding block are connected with the one end of suit in the epaxial elastic component of pivot, the other end of elastic component with install in the epaxial regulating block looks butt of pivot.

The cam is fixedly sleeved on the rotating shaft, one end of a transverse sliding block connected to the rotating shaft is provided with a contact end, and the contact end is attached to a contour curved surface on the cam. When the cam rotates integrally along with the rotating shaft, the contact end attached to the cam profile curved surface moves along the cam profile curved surface; when the contact end moves from a high position to a low position on the cam, the transverse sliding block is close to the cam along the rotating shaft, the elastic piece connected to the other end of the transverse sliding block stretches, and the vehicle-mounted display enters a closed state from an open state; when the contact end moves from the low position to the high position on the cam, the transverse sliding block is far away from the cam along the rotating shaft, the elastic piece connected to the other end of the transverse sliding block contracts, and the vehicle-mounted display enters an opening state from a closing state.

Preferably, the contact end comprises two contact shafts oppositely arranged along the length direction of the transverse sliding block and a contact roller sleeved on the contact shafts, the contact roller is rotatably connected on the contact shafts, and the contact roller is in line contact with the contour curved surface of the cam.

The contact end comprises two contact shafts which are oppositely arranged and a contact roller sleeved on the contact shafts, the contact roller is rotationally connected to the contact shafts, and the contact roller is in line contact with the contour curved surface of the cam; the two mechanisms in line contact do rolling friction when moving relatively, the friction resistance is small, and the cam can push the transverse sliding block to move only by a small driving load.

Preferably, the central axis of the contact roller intersects and is perpendicular to the central axis of the cam.

The central axis of the contact roller is intersected and vertical to the central axis of the cam, so that the direction of the driving load is consistent with the axial direction of the rotating shaft when the cam drives the transverse sliding block to move, and the phenomenon of side inclination of the transverse sliding block in the movement process is prevented.

Preferably, the adjusting block is a limit nut, a threaded section is arranged on the rotating shaft, the limit nut is sleeved on the threaded section in a matched mode, and the limit nut can move along the axial direction of the threaded section under the driving of the elastic piece.

The rotating shaft drives the cam to rotate, the contact roller of the contact end of the transverse sliding block slides along the curved surface of the cam profile, when the contact roller slides along the closed area, the transition area and the open area, the contact roller axially displaces along the rotating shaft, and the cam cannot transversely move along the rotating shaft due to the fact that the cam is fixedly sleeved on the rotating shaft, so that the transverse sliding block axially displaces along the rotating shaft and compresses the elastic part, the compressed elastic part has the tendency of driving the limiting nut to transversely displace, and in the process, the rotating shaft rotates, and the limiting nut axially displaces along the thread section under the double actions of transverse driving and rotating; in the process, every time the rotating shaft rotates for 1/4 circles, the contact roller moves from the closing area to the opening area along the transition area, the moving distance of the contact roller along the axial direction of the cam is equal to the axial distance between the high position and the low position, the elastic part is compressed to the axial distance between the high position and the low position, the limiting nut has an axial moving trend under the driving of the elastic part, however, the rotating shaft rotates for only 1/4 circles, the limiting nut only has the moving trend under the locking of the thread section and cannot actually move, therefore, the elastic part is constantly at the maximum compression amount of the axial distance between the high position and the low position, the contact roller is fixed in the opening area, and the vehicle-mounted display is positioned to the optimal viewing angle.

To sum up, the utility model discloses following beneficial effect has: (1) when the cam and the cam assembly are applied to the vehicle-mounted display, the vehicle-mounted display can automatically form positioning after rotating to a specific angle, and a positioning mechanism does not need to be added; (2) the cam and the cam component are applied to the vehicle-mounted display, when the vehicle-mounted display is collided in an opening state, the vehicle-mounted display can be slightly deviated, and further part of reaction load is eliminated; (3) when the vehicle-mounted display is in any position state, two centrosymmetric same-structure areas on the cam are aligned for positioning, and the position precision of the vehicle-mounted display is greatly improved.

Drawings

Fig. 1 is a schematic structural diagram of the cam in the present invention.

Fig. 2 is a schematic view of the circumferential angle distribution of the cam in the present invention.

Fig. 3 is another schematic structural diagram of the cam of the present invention.

Fig. 4 is a schematic structural view of the whole middle cam assembly of the present invention.

Fig. 5 is a schematic structural diagram of the middle transverse sliding block of the present invention.

Fig. 6 is another schematic structural diagram of the transverse sliding block of the present invention.

Fig. 7 is a schematic structural diagram of the cam assembly when the vehicle-mounted display of the present invention is closed.

Fig. 8 is a schematic structural view of the cam assembly when the on-board display of the present invention is opened.

In the figure: 1. the cam comprises a cam body 1a, a cam body 1b, a special-shaped cam body 1c, an annular groove 2, a closing area 3, a transition area 4, an opening area 5, an over-limit area 6, a self-locking area 7, a high position 8, a low position 9, a rotating shaft 9a, a threaded section 10, a transverse sliding block 11, a contact shaft 12, a contact roller 13, an elastic part 14, an adjusting block 15, a pin hole 16, a pin 17, a mounting disc 18, a through hole 19, a mounting hole 20, a sliding block 20a, a base body 20b, a fork body 21, a guide block 22, a damping gasket 23, a shaft hole 24, a first reinforcing plate 25, a second reinforcing plate 26, a mounting plate 27 and a threaded mounting hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Example (b):

a cam and cam assembly of a vehicle-mounted display comprises a cam 1 fixedly sleeved on a rotating shaft 9, wherein a transverse sliding block 10 is arranged on the rotating shaft, one end of the transverse sliding block is provided with a contact end, the contact end is attached to a contour curved surface on the cam, the other end of the transverse sliding block is connected with one end of an elastic component 13 sleeved on the rotating shaft, and the other end of the elastic component is abutted with an adjusting block 14 arranged on the rotating shaft; the vertical projection of the cam profile curved surface is in a ring shape, a closing area 2, an opening area 4 and an over-limit area 5 are arranged on the profile curve, a transition area 3 is arranged between the closing area and the opening area, the other end of the opening area is connected with one end of the over-limit area, the other end of the over-limit area is connected with a self-locking area 6, the peripheral angle distribution of the closing area is 0-5 degrees, the peripheral angle distribution of the transition area is 5-80 degrees, the peripheral angle distribution of the opening area is 80-130 degrees, the peripheral angle distribution of the over-limit area is 130-170 degrees, and the peripheral angle distribution of the self-locking area is 170-180 degrees; the contour curves of the cams are distributed in central symmetry; on the horizontal projection of the cam contour curved surface, the corresponding curve of the over-limit area and the corresponding curve position of the self-locking area are continuous, the curvature radius of each point on the corresponding curve of the over-limit area is smaller than that of each point on the corresponding curve of the self-locking area, and the corresponding curves of the other areas are in smooth transition; the cam comprises a high position 7 and a low position 8, wherein the high position is in an opening area, and the low position is in a closing area; the contact end comprises two contact shafts 11 which are oppositely arranged and a contact roller 12 which is sleeved on the contact shafts, the contact roller is rotationally connected on the contact shafts, and the contact roller is in line contact with the contour curved surface of the cam; the central axis of the contact roller is intersected and vertical to the central axis of the cam; the central axis of the transverse sliding block is collinear with the central axis of the cam, and the transverse sliding block can move transversely along the rotating shaft under the driving of the cam; the regulating block is a limit nut, a threaded section 9a is arranged on the rotating shaft, the limit nut is in threaded connection with the threaded section, and the limit nut is connected to the threaded section in a lifting mode.

As shown in fig. 1 to 3, the cam includes a body 1a and a shaped cam 1b, and an annular groove 1c is provided between an outer peripheral surface of the body and an outer peripheral surface of the shaped cam. The body is formed by cutting an annular column, in the embodiment, four planes are cut on the side circumferential surface of the body, the four planes and the residual curved surface on the side circumferential surface are distributed at intervals, and the cut cam body is symmetrical in surface and center; the body is provided with a pair of pin holes 15, the two pin holes are arranged on opposite cutting planes, and the pin holes penetrate through the side wall of the cam body. The special-shaped cam is also processed from the annular column, wherein the diameter of the inner ring and the outer ring of the special-shaped cam is consistent with that of the body. The special-shaped cam is centrosymmetric and is divided into a first area and a second area, and then the special-shaped cam is introduced in a partition mode only within 180 degrees of the first area. The vertical projection of the profile curved surface of the special-shaped cam is a circular profile curve, and a closed area, a transition area, an open area, an over-limit area and a self-locking area are sequentially arranged on the profile curve; the peripheral angle distribution of the closed area is 0-5 degrees, the peripheral angle distribution of the transition area is 5-80 degrees, the peripheral angle distribution of the open area is 80-130 degrees, the peripheral angle distribution of the over-limit area is 130-170 degrees, and the peripheral angle distribution of the self-locking area is 170-180 degrees; along the axial direction of the special-shaped cam, the closing area is positioned at the position of a wave trough, the opening area is positioned at the position of a wave crest, and the transition area is smoothly connected with the closing area and the opening area in a transition mode. On the horizontal projection of the cam contour curved surface, the corresponding curve of the over-limit area and the corresponding curve position of the self-locking area are continuous, the curvature radius of each point on the corresponding curve of the over-limit area is smaller than that of each point on the corresponding curve of the self-locking area, and therefore when the cam works, a matched workpiece needs to enter the over-limit area from the self-locking area and needs to be driven by a larger load. The corresponding curved surfaces of the closing area, the transition area, the opening area and the transfinite area are smoothly connected in sequence; the curvature radius of each point on the curved surface corresponding to the over-limit area is smaller than that of each point on the curved surface corresponding to the self-locking area; the corresponding curved surface of the self-locking area in the area I is smoothly connected with the corresponding curved surface of the closing area in the area II; the high position of the special-shaped cam is positioned in the opening area, and the low position of the special-shaped cam is positioned in the closing area.

In the embodiment, the cam is applied to the vehicle-mounted display, the closing area corresponds to the initial closed state of the vehicle-mounted display, the opening area corresponds to the viewing state of the vehicle-mounted display, and the self-locking area corresponds to the turning closed state of the vehicle-mounted display. Specifically, when the vehicle-mounted display is in an initial closed state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 0-5 degrees, and a corresponding peripheral angle of a closed area is 0-5 degrees; the vehicle-mounted display reaches a viewing state after rotating 75 degrees, the rotating process corresponds to a transition area on the cam, and the corresponding circumferential angle is 5-80 degrees; when the vehicle-mounted display is in a watching state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 80-130 degrees, and a corresponding peripheral angle of an opening area is 80-130 degrees; the vehicle-mounted display continues to rotate by 40 degrees and then reaches a turning and closing state, the rotating process corresponds to an over-limit area on the cam, and the corresponding peripheral angle is 130-170 degrees; when the vehicle-mounted display is in a turning closed state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 170-180 degrees, and a corresponding circumferential angle of the self-locking area is 170-180 degrees. The areas on the cam correspond to the position states of the vehicle-mounted display one by one, and the position states of the vehicle-mounted display can be adjusted by adjusting the circumferential angle distribution of the areas on the cam profile curve. The utility model discloses an above-mentioned technical scheme makes vehicle-mounted display rotate specific angle and can form the location automatically.

However, the one-sided rotation structure is unstable, and the positional accuracy of the in-vehicle display is greatly reduced once the cam is worn. In the utility model, the contour curve of the cam is designed to be centrosymmetric, and the position state of the vehicle-mounted display is determined by the same centrosymmetric region on the cam; specifically, when the vehicle-mounted display is in an initial closed state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 0-5 degrees, and corresponding peripheral angles of a closed area are 0-5 degrees and 180-185 degrees; the vehicle-mounted display reaches a viewing state after rotating 75 degrees, the rotating process corresponds to a transition area on the cam, and the corresponding peripheral angle is 5-80 degrees and 185-260 degrees; when the vehicle-mounted display is in a watching state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 80-130 degrees, and corresponding peripheral angles of an opening area are 80-130 degrees and 260-310 degrees; the vehicle-mounted display continues to rotate by 40 degrees and then reaches a turning and closing state, the rotating process corresponds to an over-limit area on the cam, and the corresponding peripheral angles are 130-170 degrees and 310-350 degrees; when the vehicle-mounted display is in a turning closed state, an included angle between the vehicle-mounted display and a ceiling of a vehicle is 170-180 degrees, and a corresponding peripheral angle of the self-locking area is 170-180 degrees and 350-360 degrees. When the vehicle-mounted display is in any position state, two centrosymmetric same-structure areas on the cam are aligned for positioning, and the position precision of the vehicle-mounted display is greatly improved.

As shown in fig. 4, a pin 16 passes through a pin hole on the cam body to fixedly mount the cam on the rotating shaft, the rotating shaft is hollow, one end of the rotating shaft is provided with a cylindrical mounting disk 17 for connecting a motor, the mounting disk is partially cut along the axial direction of the mounting disk, a through hole 18 concentric with the rotating shaft is arranged at the central position of the mounting disk, four threaded mounting holes 19 are arranged on the end surface of the mounting disk far away from the cam, and the mounting holes are uniformly distributed by taking the axial direction of the mounting disk as an axis. The curved surface end of the special-shaped cam is connected with the contact end of the transverse sliding block in a matching way. The other end of the transverse sliding block is provided with a damping gasket 22, and an elastic part along the axial direction of the rotating shaft is fixedly connected to the damping gasket, and the elastic part in the embodiment is a spring which is sleeved on the rotating shaft. The other end of elastic component is connected with the regulating block, and the regulating block is stop nut, all is equipped with the screw thread in the movable range of regulating block in the pivot, and this screw thread connection of stop nut threaded connection is through the elastic component shrink tensile and the normal running fit of pivot, can make the regulating block be reciprocating motion along the pivot.

As shown in fig. 5 and 6, the lateral sliding block includes a sliding block 20 and a guide block 21. The sliding block comprises a base body 20a and a fork body 20b, the base body is an annular column, an inner ring of the base body is used for installing a rotating shaft, the fork body is plate-shaped, a shaft hole 23 is formed in the end face of the fork body, a contact shaft is installed in the shaft hole, a contact roller is sleeved on the contact shaft, and the contact roller and the contact shaft can rotate relatively. The fork body comprises a first fork body III and a second fork body IV which are symmetrically connected to the peripheral surface of the base body; the other end of the first fork body is connected to the peripheral surface of the guide block, a first reinforcing plate 24 is arranged between the left end surface of the first fork body and the side peripheral surface of the base body, and the cross section of the first reinforcing plate is triangular; the shaft hole on the second fork body is concentric with the shaft hole on the first fork body, and the axis of the shaft hole is vertical to the axis of the base body; a second reinforcing plate 25 is arranged between the upper end face of the second fork body and the right end face of the base body, and the cross section of the second reinforcing plate is also triangular. The guide block is an annular column, and two symmetrical cutting planes are arranged on the outer peripheral surface of the guide block along the axial direction of the guide block; the first fork body is connected with the guide block through a mounting plate 26; the left end surface of the guide block is flush with the left end surface of the first fork body; a cutting plane of the guide block is provided with a threaded mounting hole 27.

The following describes a process of driving the state change of each position of the vehicle display by the cam assembly:

as shown in fig. 7 and 8, when the rotating shaft rotates, the cam is driven to rotate together, the contact position of the contact roller and the cam moves from the closing area to the opening area through the transition area, the transverse sliding block is pushed to move leftwards, the spring is compressed and applies thrust along the axial direction of the adjusting block, after the rotating shaft rotates for one circle, the limiting nut moves leftwards for a distance of one thread pitch, and when the contact roller moves to the opening area, the vehicle-mounted display is in an opening state, and the optimal included angle between the vehicle-mounted display and the ceiling is 110 degrees in the embodiment. When the vehicle-mounted display is in the best viewing position, the rotating shaft stops rotating, the limiting nut does not move any more at the moment, and the spring in the compressed state limits the transverse sliding block, so that the transverse sliding block cannot move continuously along the axial direction, and the vehicle-mounted display is kept at the best viewing position. Based on the flexible deformation capacity of the spring, the position of the vehicle-mounted display is not kept rigid, when a passenger collides with the vehicle-mounted display, the contact roller moves under the action of the instantaneous collision load and enters the over-limit area from the opening area, the limiting nut continues to move leftwards under the driving of the compression spring, so that the vehicle-mounted display rotates at a small angle to be separated from the passenger, a large amount of collision load is dissipated to the surrounding space in the process, and the passenger is prevented from being injured due to rigid collision. When the rotating shaft continues to drive the cam to rotate, the contact roller moves on the over-limit area and finally enters the self-locking area, and in the process, the spring is always in a compressed state and always provides axial thrust for the limiting nut, so that the limiting nut always moves leftwards; when the contact roller rotates to the self-locking area, the limiting nut reaches the leftmost end, the vehicle-mounted display is in a turnover closed state at the moment, and the spring is in a natural extension state.

Claims

1. The utility model provides a cam of vehicle-mounted display, its characterized in that, cam profile curved surface is the ring shape along the axial projection of cam, be equipped with on the profile curve and close the district, open the district and cross the limit district, close the district and open and be equipped with the transition district between the district, the other end in district of opening links to each other with the one end of crossing the limit district, the other end of crossing the limit district is connected with the auto-lock district, the cam includes high-order and low level, the high-order is opening the district, the low level is closing the district, there is the difference in height along the cam axial between high-order and the low level.

2. The cam of claim 1, wherein the closed area has a circumferential angle distribution of 0 to 5 °, the transition area has a circumferential angle distribution of 5 to 80 °, the open area has a circumferential angle distribution of 80 to 130 °, the overrun area has a circumferential angle distribution of 130 to 170 °, and the self-locking area has a circumferential angle distribution of 170 to 180 °.

3. The cam for vehicle display according to claim 1, wherein the cam has a profile curve with a central symmetry distribution.

4. The cam of claim 1, wherein the cam profile curved surface is projected along the axial direction of the cam, the corresponding curve of the over-limit area is continuous with the corresponding curve of the self-locking area, the curvature radius of each point on the corresponding curve of the over-limit area is smaller than that of each point on the corresponding curve of the self-locking area, and the corresponding curves of the other areas are in smooth transition.

5. A cam assembly of a vehicle-mounted display device, comprising the cam as claimed in claim 1, 2, 3 or 4, wherein the cam is sleeved on a rotating shaft, a transverse sliding block is arranged on the rotating shaft, one end of the transverse sliding block is provided with a contact end, the contact end is attached to a contour curved surface on the cam, the other end of the transverse sliding block is connected with one end of an elastic member sleeved on the rotating shaft, and the other end of the elastic member is abutted with an adjusting block arranged on the rotating shaft.

6. The cam assembly of claim 5, wherein the contact end comprises two contact shafts oppositely arranged along the length direction of the transverse sliding block and a contact roller sleeved on the contact shafts, the contact roller is rotatably connected to the contact shafts, and the contact roller is in line contact with the contour curved surface of the cam.

7. The cam assembly of claim 6, wherein a central axis of the contact roller intersects and is perpendicular to a central axis of the cam.

8. The cam assembly of the vehicle-mounted display according to claim 5, wherein the adjusting block is a limit nut, the rotating shaft is provided with a threaded section, the limit nut is sleeved on the threaded section in a matching manner, and the limit nut can move along the axial direction of the threaded section under the driving of the elastic member.