CN110185897B - Cam and cam assembly for vehicle display - Google Patents

Abstract

A cam and cam component for a vehicle display aims to solve the technical problems of complex corner positioning mechanism and low fault tolerance of the vehicle display in the prior art. The utility model comprises a cam for a vehicle display, wherein the vertical projection of a cam profile curved surface is a circular profile curve, a closing area, an opening area and a limiting area are arranged on the profile curve, a transition area is arranged between the closing area and the opening area, the other end of the opening area is connected with one end of the limiting area, the other end of the limiting area is connected with a self-locking area, the circumferential angle of the closing area is distributed to 0-5 degrees, the circumferential angle of the transition area is distributed to 5-80 degrees, the circumferential angle of the opening area is distributed to 80-130 degrees, the circumferential angle of the limiting area is distributed to 130-170 degrees, and the circumferential angle of the self-locking area is distributed to 170-180 degrees. When the utility model is applied to a vehicle-mounted display, the positioning can be automatically formed by rotating the display to a specific angle; when the vehicle display is bumped in the open state, it may be offset by a small angle, eliminating part of the reaction load.

Description

Cam and cam assembly for vehicle display

Technical Field

The utility model relates to a cam and a cam assembly for a vehicle display.

Background

The vehicle-mounted displays are divided into two types, one is a small-sized vehicle-mounted display, and the other is a television which is placed on a passenger car for watching, namely a vehicle-mounted television; the application of the utility model is focused on a vehicle television. At present, the vehicle-mounted television is a necessary device for a medium-distance coach, effectively eases the boring atmosphere of the space in the coach, and becomes an important tool for the medium-distance coach to wear out. For convenience of passengers, the vehicle-mounted television is often installed in the aisle, but this affects the getting on and off of passengers to some extent, so the existing vehicle-mounted television is designed as an openable 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 turned on, 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 turning angle is very important through what structure.

Chinese patent publication number CN 206694399U discloses a rotary shaft device and a display bracket, which includes a rotary shaft having an end cap at one end, a fixed bracket, a locking member, a fixed cam, a rotary cam, and an elastic member; the other end of the rotating shaft sequentially passes through the elastic piece, the rotating cam, the fixed cam and the fixed bracket and is connected with the locking piece; the rotary cam is meshed with the fixed cam, the fixed cam is fixedly connected with the fixed support, the rotary cam is driven to rotate when the rotary shaft rotates, and the rotary cam drives the fixed cam and the fixed support to rotate simultaneously.

In the above patent, the rotary cam is engaged with the fixed cam, the peak and the valley of the rotary cam are corresponding to the peak and the valley of the fixed cam respectively, the fixed cam is fixedly connected with the fixed bracket, the rotary cam is driven to rotate when the rotating shaft rotates, the rotary cam drives the fixed cam and the fixed bracket to rotate simultaneously, after rotating by a certain angle, the rotary cam and the fixed cam can automatically slide back to the original position under the action of the rotary cam and the fixed cam, and the rotary homing is not performed manually.

According to the utility model, the rotating cam and the fixed cam which are meshed with each other can limit the rotation angle of the vehicle-mounted television by 0-180 degrees, and can realize automatic homing. However, the European common market regulations require E-MARK certification of both the motor vehicle and its safety accessories in accordance with the regulations of the European Union code (EEC Directives) and the European economic Commission regulations (ECE Regulation); for a display for a passenger car, the related authentication standard prescribes that the display in a watching state can rotate by a small angle along the load direction after being impacted by the load; when the head of the passenger is carelessly impacted to the display, the display is separated from the head of the passenger under the action of collision load, so that the head of the passenger is prevented from being damaged due to hard collision. After the vehicle-mounted television is subjected to corner limiting, the vehicle-mounted television is fixed, and cannot deviate at a small angle under the action of collision load, so that passengers collide with the vehicle-mounted television in a hard manner, and the passengers are extremely easy to be injured.

In addition, in order to ensure riding comfort of passengers, the seats are all of inclined design, and the optimal angle for watching by eyes is that the sight is basically vertical to a vehicle-mounted television screen; considering the inclination angle of the seat, when the vehicle-mounted television is in a stable open state, the optimal included angle range between the vehicle-mounted television and the ceiling is about 110 degrees. For example, chinese patent publication No. CN 102734614B discloses a foldable display stand, comprising: the screen bracket is used for fixing a screen, the lower end of the screen bracket is provided with at least one pivoting part, and the pivoting part is provided with a limiting part; the base is provided with a pivot seat; the support 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 bracket through an upper rotating shaft, the lower pivoting part is pivoted with the pivoting seat of the base through a lower rotating shaft, and at least one linkage mechanism is arranged on the side edge of the support arm to link 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 component, wherein the first cam, the second cam, the limiting piece and the first elastic component are sleeved on the mandrel, the first cam and the second cam are respectively provided with at least one convex block, the limiting piece is provided with a stopping part, and the stopping part and the limiting part of the screen bracket can mutually stop to limit the screen to rotate in a first angle range; when the support arm rotates through the lower rotating shaft, the linkage mechanism links the first cam and the second cam to rotate relatively, and when the protruding block of the first cam and the protruding block of the second cam are contacted and pushed, the second cam can move axially and push the limiting piece to enable the stop part of the limiting piece to leave the limiting part of the screen support, so that 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, a screen can be rotated to a specific angle to form positioning, and in particular, the support frame can also realize positioning at about 110 degrees through fine adjustment of components; however, the corner positioning mechanism of the utility model is extremely complex, and the fault tolerance of the mechanism is low.

Disclosure of Invention

The utility model mainly aims to provide a cam and a cam assembly, and when the cam and the cam assembly are applied to a vehicle-mounted display, the vehicle-mounted display can automatically form positioning after rotating to a specific angle.

It is another object of the present utility model to provide a cam and cam assembly that is applied to a vehicle display that can be offset by a small angle when the vehicle display is bumped in an open state, thereby eliminating a portion of the reaction load.

In order to achieve the above purpose, the present utility model adopts the following technical scheme.

A cam for a vehicle display is characterized in that a vertical projection of a cam profile curved surface is a circular profile curve, a closing area, an opening area and a passing limiting area are arranged on the profile curve, a transition area is arranged between the closing area and the opening area, the other end of the opening area is connected with one end of the passing limiting area, the other end of the passing limiting area is connected with a self-locking area, the peripheral angle of the closing area is distributed to 0-5 degrees, the peripheral angle of the transition area is distributed to 5-80 degrees, the peripheral angle of the opening area is distributed to 80-130 degrees, the peripheral angle of the passing limiting area is distributed to 130-170 degrees, and the peripheral angle of the self-locking area is distributed to 170-180 degrees.

The vertical projection of the cam profile curved surface is a profile curve in a circular ring shape, wherein the inner ring of the cam can be sleeved on the rotating component, so that the cam is driven by the rotating component 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. Specifically, when the vehicle-mounted display is in an initial closed state, an included angle between the vehicle-mounted display and a vehicle ceiling is 0-5 degrees, and a corresponding peripheral angle of a closing area is 0-5 degrees; the vehicle-mounted display reaches a viewing state after rotating for 75 degrees, wherein 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 viewing state, the included angle between the vehicle-mounted display and the ceiling of the vehicle is 80-130 degrees, and the corresponding peripheral angle of the opening area is 80-130 degrees; the vehicle-mounted display continuously rotates for 40 degrees and then reaches a turnover closed state, wherein the rotation process corresponds to an over-limit area on a cam, and the corresponding circumferential angle is 130-170 degrees; when the vehicle-mounted display is in a turned-over closed state, the included angle between the vehicle-mounted display and the vehicle ceiling is 170-180 degrees, and the corresponding peripheral angle of the self-locking area is 170-180 degrees. The positions of the vehicle-mounted display can be adjusted by adjusting the circumferential angle distribution of each region on the cam profile curve according to the one-to-one correspondence between each region on the cam and each position state of the vehicle-mounted display. According to the technical scheme, the vehicle-mounted display can automatically form positioning by rotating to a specific angle.

Preferably, the profile curves of the cams are distributed centrosymmetrically.

According to the description, the circumferential angle of 0-180 degrees on the cam profile curve is partitioned, so that the position state change requirement of the vehicle-mounted display from an initial closed state to a viewing state and then to a turning closed state can be met; however, the structure of one-sided rotation is unstable, and once the cam is worn out, the positional accuracy of the in-vehicle display will be greatly reduced. The contour curve of the cam is designed to be in a central symmetry shape, and the position state of the vehicle-mounted display is determined through the same central symmetry area on the cam; specifically, when the vehicle-mounted display is in an initial closed state, the included angle between the vehicle-mounted display and the ceiling of the vehicle is 0-5 degrees, and the corresponding peripheral angle of the closed area is 0-5 degrees and 180-185 degrees; the vehicle-mounted display reaches a viewing state after rotating for 75 degrees, wherein the rotating process corresponds to a transition area on the cam, and the corresponding circumferential angle is 5-80 degrees and 185-260 degrees; when the vehicle-mounted display is in a viewing state, the included angle between the vehicle-mounted display and the ceiling of the vehicle is 80-130 degrees, and the corresponding peripheral angle of the opening area is 80-130 degrees and 260-310 degrees; the vehicle-mounted display continuously rotates for 40 degrees and then reaches a turning closed state, wherein the rotating process corresponds to an over-limit area on a cam, and the corresponding circumferential angle is 130-170 degrees and 310-350 degrees; when the vehicle-mounted display is in a turned-over closed state, the included angle between the vehicle-mounted display and the vehicle ceiling is 170-180 degrees, and the 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, the cams are aligned with two symmetrical areas with the same structure to be positioned, and the position accuracy of the vehicle-mounted display is greatly improved.

Preferably, on the horizontal projection of the cam profile curved surface, the corresponding curve of the over-limit region is continuous with the corresponding curve position of the self-locking region, the curvature radius of each point on the corresponding curve of the over-limit region is smaller than the curvature radius of each point on the corresponding curve of the self-locking region, and the corresponding curves of the other regions are in smooth transition.

Because the corresponding curve of the over-limit region is continuous with the corresponding curve position of the self-locking region on the horizontal projection of the cam profile curved surface, the curvature radius of each point on the corresponding curve of the over-limit region is smaller than that of each point on the corresponding curve of the self-locking region, and the vehicle-mounted display needs to be driven by larger external load when entering the turning closed state from the watching state; based on the above, when the vehicle-mounted display enters the overturning closed state, the vibration included angle between the vehicle-mounted display and the vehicle ceiling is limited in the range of 170-180 degrees under the action of smaller vibration load, so that the self-locking phenomenon under the smaller vibration load is formed. When the vehicle-mounted display is impacted in an open state, due to smooth transition among corresponding curves of other areas, the vehicle-mounted display rotates and deflects under the action of impact load, so that partial reaction load is dissipated, and the vehicle-mounted display is not damaged when passengers collide with the vehicle-mounted display, thereby meeting the relevant regulations of E-MARK.

Preferably, the cam comprises a high position in the open region and a low position in the closed region.

In the background art, the optimal included angle range between the vehicle-mounted television and the ceiling is about 110 degrees when the vehicle-mounted television is in a stable opening state by taking the inclination angle of the seat into consideration; the cam comprises a high position and a low position, wherein the high position is in an opening area, the low position is in a closing area, and the peripheral angle corresponding to the high position can be designed to be 110 degrees, so that the vehicle-mounted display can be automatically positioned to an optimal viewing angle after being opened.

The cam assembly for the vehicle display comprises a cam, wherein the cam is fixedly sleeved on a rotating shaft, the cam further comprises a transverse sliding block connected to 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 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.

The cam is fixedly sleeved on the rotating shaft, one end of the transverse sliding block connected to the rotating shaft is provided with a contact end, and the contact end is attached to the contour curved surface on the cam. When the cam rotates integrally 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 approaches the cam along the rotating shaft, an 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 a low position to a 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 open state from a closed state.

Preferably, the contact end comprises two contact shafts and contact rollers sleeved on the contact shafts, the contact rollers are rotatably connected to the contact shafts, and the contact rollers are in line contact with the contour curved surface of the cam.

The contact end comprises two contact shafts and contact rollers sleeved on the contact shafts, the contact rollers are rotationally connected to the contact shafts, and the contact rollers are in line contact with the contour curved surface of the cam; the two mechanisms in line contact do rolling friction during relative movement, the friction resistance is small, and the cam can push the transverse sliding block to move only by 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 with and perpendicular to the central axis of the cam, so that when the cam drives the transverse sliding block to move, the direction of driving load is consistent with the axial direction of the rotating shaft, and the transverse sliding block is prevented from rolling in the movement.

Preferably, 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 central axis of the transverse sliding block is collinear with the central axis of the cam, so that the direction of driving load is consistent with the axial direction of the rotating shaft when the cam drives the transverse sliding block to move, and the transverse sliding block is prevented from rolling in the movement.

Preferably, the adjusting block is a limit bolt, a threaded section is arranged on the rotating shaft, the limit bolt is in threaded connection with the threaded section, and the limit bolt can be connected to the threaded section in a lifting manner.

In summary, the utility model has the following beneficial effects: (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; (2) The cam and the cam component are applied to the vehicle-mounted display, and when the vehicle-mounted display is collided in an opening state, the vehicle-mounted display can generate small-angle offset, so that partial reaction load is eliminated; (3) When the vehicle-mounted display is in any position state, the cams are aligned with two symmetrical areas with the same structure to be positioned, and the position accuracy of the vehicle-mounted display is greatly improved.

Drawings

Fig. 1 is a schematic view of the structure of the cam in the present utility model.

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

Fig. 3 is a schematic view of another construction of the cam of the present utility model.

FIG. 4 is a schematic view of the overall structure of the cam assembly of the present utility model.

Fig. 5 is a schematic view of the structure of the lateral slider in the present utility model.

Fig. 6 is a schematic view of another structure of the lateral slider of the present utility model.

FIG. 7 is a schematic view of the cam assembly of the present utility model when the vehicle monitor is closed.

Fig. 8 is a schematic view of the cam assembly of the present utility model when the vehicle monitor is opened.

In the figure: 1. cams, 1a, body, 1b, profiled cams, 1c, annular groove, 2, closing area, 3, transition area, 4, opening area, 5, passing limit area, 6, self-locking area, 7, high position, 8, low position, 9, rotation shaft, 9a, thread section, 10, lateral sliding block, 11, contact shaft, 12, contact roller, 13, elastic piece, 14, adjusting block, 15, pin hole, 16, pin, 17, mounting plate, 18, through hole, 19, mounting hole, 20, sliding block, 20a, base body, 20b, fork body, 21, guide block, 22, shock absorbing pad, 23, shaft hole, 24, first reinforcing plate, 25, second reinforcing plate, 26, mounting plate, 27, thread mounting hole.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Examples:

the cam and cam component for the vehicle display comprises a cam 1, wherein the vertical projection of a cam profile curved surface is a circular profile curve, a closing area 2, an opening area 4 and an over-limiting 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-limiting area, the other end of the over-limiting area is connected with a self-locking area 6, the peripheral angle of the closing area is distributed to 0-5 degrees, the peripheral angle of the transition area is distributed to 5-80 degrees, the peripheral angle of the opening area is distributed to 80-130 degrees, the peripheral angle of the over-limiting area is distributed to 130-170 degrees, and the peripheral angle of the self-locking area is distributed to 170-180 degrees; the profile curve of the cam is distributed in a central symmetry manner; on the horizontal projection of the cam profile curved surface, the corresponding curve of the over-limit region is continuous with the corresponding curve position of the self-locking region, the curvature radius of each point on the corresponding curve of the over-limit region is smaller than the curvature radius of each point on the corresponding curve of the self-locking region, and the corresponding curves of other regions 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 cam assembly comprises the cam, the cam is fixedly sleeved on the rotating shaft 9, the cam further comprises a transverse sliding block 10 connected to 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 piece 13 sleeved on the rotating shaft, and the other end of the elastic piece is abutted against an adjusting block 14 arranged on the rotating shaft; the contact end comprises two contact shafts 11 which are oppositely arranged and contact rollers 12 sleeved on the contact shafts, the contact rollers are rotationally connected to the contact shafts, and the contact rollers are in line contact with the contour curved surface of the cam; the central axis of the contact roller intersects with and is perpendicular 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 transversely move along the rotating shaft under the drive of the cam; the regulating block is a limit bolt, a threaded section 9a is arranged on the rotating shaft, the limit bolt is in threaded connection with the threaded section, and the limit bolt can be connected to the threaded section in a lifting manner.

As shown in fig. 1 to 3, the cam includes a body 1a and a shaped cam 1b, with an annular groove 1c provided between the outer peripheral surface of the body and the 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 peripheral surface of the body, the four planes are distributed with the rest curved surfaces on the side peripheral surface at intervals, and the cut cam body is symmetrical in surface and symmetrical in center; the body is provided with a pair of pin holes 15, two pin holes being provided on opposite cutting planes, the pin holes penetrating through the side walls of the cam body. The special-shaped cam is also machined by an annular column, wherein the diameter of the inner ring and the outer ring of the special-shaped cam are consistent with the diameter of the inner ring and the outer ring of the body. The special-shaped cam is centrosymmetric and is divided into a zone I and a zone II, and then the special-shaped cam is introduced in a zone of 180 degrees of the zone I. The vertical projection of the profile curved surface of the special-shaped cam is a circular profile curve, and a closing area, a transition area, an opening area, a limiting area and a self-locking area are sequentially arranged on the profile curve; the peripheral angle of the closing area is distributed to 0-5 degrees, the peripheral angle of the transition area is distributed to 5-80 degrees, the peripheral angle of the opening area is distributed to 80-130 degrees, the peripheral angle of the passing limiting area is distributed to 130-170 degrees, and the peripheral angle of the self-locking area is distributed to 170-180 degrees; along the axial direction of the special-shaped cam, the closing area is positioned at the 'trough' position, the opening area is positioned at the 'crest' position, and the transition area is smoothly connected with the closing area and the opening area in a transition way. On the horizontal projection of the cam profile curved surface, the corresponding curve of the over-limit region is continuous with the corresponding curve position of the self-locking region, the curvature radius of each point on the corresponding curve of the over-limit region is smaller than that of each point on the corresponding curve of the self-locking region, and based on the curvature radius, when the cam works, a matched workpiece enters the over-limit region from the self-locking region and needs larger load to drive. The corresponding curved surfaces of the closing area, the transition area, the opening area and the over-limit area are sequentially and smoothly connected; the curvature radius of each point on the curved surface corresponding to the over-limit region is smaller than that of each point on the curved surface corresponding to the self-locking region; 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 this embodiment, the cam 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 viewing state of the vehicle-mounted display, and the self-locking area corresponds to the turning closing 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 vehicle ceiling is 0-5 degrees, and a corresponding peripheral angle of a closing area is 0-5 degrees; the vehicle-mounted display reaches a viewing state after rotating for 75 degrees, wherein 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 viewing state, the included angle between the vehicle-mounted display and the ceiling of the vehicle is 80-130 degrees, and the corresponding peripheral angle of the opening area is 80-130 degrees; the vehicle-mounted display continuously rotates for 40 degrees and then reaches a turnover closed state, wherein the rotation process corresponds to an over-limit area on a cam, and the corresponding circumferential angle is 130-170 degrees; when the vehicle-mounted display is in a turned-over closed state, the included angle between the vehicle-mounted display and the vehicle ceiling is 170-180 degrees, and the corresponding peripheral angle of the self-locking area is 170-180 degrees. The positions of the vehicle-mounted display can be adjusted by adjusting the circumferential angle distribution of each region on the cam profile curve according to the one-to-one correspondence between each region on the cam and each position state of the vehicle-mounted display. According to the technical scheme, the vehicle-mounted display can automatically form positioning by rotating to a specific angle.

However, the structure of one-sided rotation is unstable, and once the cam is worn out, the positional accuracy of the in-vehicle display will be greatly reduced. The contour curve of the cam is designed to be in a central symmetry shape, and the position state of the vehicle-mounted display is determined through the same central symmetry area on the cam; specifically, when the vehicle-mounted display is in an initial closed state, the included angle between the vehicle-mounted display and the ceiling of the vehicle is 0-5 degrees, and the corresponding peripheral angle of the closed area is 0-5 degrees and 180-185 degrees; the vehicle-mounted display reaches a viewing state after rotating for 75 degrees, wherein the rotating process corresponds to a transition area on the cam, and the corresponding circumferential angle is 5-80 degrees and 185-260 degrees; when the vehicle-mounted display is in a viewing state, the included angle between the vehicle-mounted display and the ceiling of the vehicle is 80-130 degrees, and the corresponding peripheral angle of the opening area is 80-130 degrees and 260-310 degrees; the vehicle-mounted display continuously rotates for 40 degrees and then reaches a turning closed state, wherein the rotating process corresponds to an over-limit area on a cam, and the corresponding circumferential angle is 130-170 degrees and 310-350 degrees; when the vehicle-mounted display is in a turned-over closed state, the included angle between the vehicle-mounted display and the vehicle ceiling is 170-180 degrees, and the 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, the cams are aligned with two symmetrical areas with the same structure to be positioned, and the position accuracy of the vehicle-mounted display is greatly improved.

As shown in fig. 4, the 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 plate 17 for connecting the motor, the mounting plate is partially cut along the axial direction of the mounting plate, the center position of the mounting plate is provided with a through hole 18 concentric with the rotating shaft, the end surface of the mounting plate far away from the cam is provided with four threaded mounting holes 19, and the mounting holes are uniformly distributed by taking the axial direction of the mounting plate as the axis. The curved surface end of the special-shaped cam is connected with the contact end of the transverse sliding block in a matched mode. The other end of the transverse sliding block is provided with a damping gasket 22, and an elastic piece in the axial direction of the rotating shaft is fixedly connected to the damping gasket, and in the embodiment, the elastic piece is a spring which is sleeved on the rotating shaft. The other end of the elastic piece is connected with an adjusting block, the adjusting block is a limit bolt, threads are arranged in the movable range of the adjusting block on the rotating shaft, the limit bolt is in threaded connection with the thread section, and the adjusting block can reciprocate along the rotating shaft through the rotating fit of the elastic piece contraction and stretching and the rotating shaft.

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, an axle hole 23 is arranged on the end face of the fork body, a contact axle is arranged in the axle hole, a contact roller is sleeved on the contact axle, and relative rotation can occur between the contact roller and the contact axle. The fork body comprises a first fork body III and a second fork body IV which are symmetrically connected to the outer peripheral surface of the base body; the other end of the first fork body is connected to the outer 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 perpendicular to the axis of the basal 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 section of the second reinforcing plate is 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 face of the guide block is flush with the left end face of the first fork body; a threaded mounting hole 27 is provided in one of the cutting planes of the guide block.

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

as shown in fig. 7 and 8, the rotating shaft rotates to drive the cam 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 compresses and applies thrust force along the axial direction of the adjusting block, the limit bolt moves leftwards by a pitch distance after each rotation of the rotating shaft, 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 at the optimal viewing position, the rotating shaft stops rotating, the limiting bolt does not move any more, and the spring in the compressed state limits the transverse sliding block so that the transverse sliding block cannot continue to move along the axial direction, and therefore the vehicle-mounted display is kept at the optimal viewing position. Based on the flexible deformability of the springs, the positions of the vehicle-mounted display are kept not rigid, when passengers collide with the vehicle-mounted display, the contact rollers move under the action of instantaneous collision load, the contact rollers enter the limiting area from the opening area, the limiting bolts continue to move leftwards under the driving of the compression springs, the vehicle-mounted display rotates at a small angle and is separated from the passengers, a large amount of collision load is dissipated into surrounding space in the process, and the passengers are prevented from being injured due to rigid collision. When the rotating shaft continuously drives the cam to rotate, the contact roller moves on the overrunning zone and finally enters the self-locking zone, and in the process, the spring is always in a compressed state and always provides axial thrust for the limit bolt, so that the limit bolt always moves leftwards; when the contact roller rotates to the self-locking area, the limit bolt reaches the leftmost end, the vehicle-mounted display is in a turnover closed state, and the spring is in a natural extension state.

Claims (7)

1. The cam for the vehicle display comprises a body and a special-shaped cam, wherein the vertical projection of a profile curved surface of the special-shaped cam is a circular profile curve, and the cam is characterized in that a closing area, an opening area and an over-limiting area are arranged on the profile curve, a transition area 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-limiting area, the other end of the over-limiting area is connected with a self-locking area, the peripheral angle of the closing area is distributed to 0-5 degrees, the peripheral angle of the transition area is distributed to 5-80 degrees, the peripheral angle of the opening area is distributed to 80-130 degrees, the peripheral angle of the over-limiting area is distributed to 130-170 degrees, and the peripheral angle of the self-locking area is distributed to 170-180 degrees;

along the axial direction of the special-shaped cam, the closing area is positioned at the 'trough' position, the opening area is positioned at the 'crest' position, and the transition area is smoothly connected with the closing area and the opening area in a transition way;

on the horizontal projection of the cam profile curved surface, the corresponding curve of the over-limit region is continuous with the corresponding curve of the self-locking region, and the curvature radius of each point on the corresponding curve of the over-limit region is smaller than that of each point on the corresponding curve of the self-locking region;

the cam comprises a high position and a low position, wherein the high position is in an opening area, and the low position is in a closing area;

the cam is fixedly sleeved on the rotating shaft, the cam further comprises a transverse sliding block connected to the rotating shaft, one end of the transverse sliding block is provided with a contact end, the contact end is attached to the contour curved surface on 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 mounted on the rotating shaft.

2. A cam for a vehicle display according to claim 1, wherein the profile of the cam is centrally symmetrical.

3. The cam for a vehicle display according to claim 1, wherein on a horizontal projection of the cam profile curved surface, the corresponding curve of the over-limit region is continuous with the corresponding curve of the self-locking region, the curvature radius of each point on the corresponding curve of the over-limit region is smaller than the curvature radius of each point on the corresponding curve of the self-locking region, and the corresponding curves of the other regions are smoothly transited.

4. A cam assembly for a vehicle display, the cam assembly being adapted for use with a cam as claimed in any one of claims 1 to 3, wherein the contact end comprises two contact shafts disposed in opposition and a contact roller mounted on the contact shafts, the contact roller being rotatably connected to the contact shafts, the contact roller being in line contact with the contoured surface of the cam.

5. The cam assembly for a vehicle display of claim 4, wherein the central axis of the contact roller intersects and is perpendicular to the central axis of the cam.

6. The cam assembly for a vehicle display of claim 4, wherein the central axis of the lateral slider is collinear with the central axis of the cam, and the lateral slider is movable laterally along the shaft under cam actuation.

7. The cam module for a vehicle display of claim 4, wherein the adjusting block is a limit bolt, the rotating shaft is provided with a threaded section, the limit bolt is in threaded connection with the threaded section, and the limit bolt is connected to the threaded section in a lifting manner.