CN214001223U - L-shaped bird head - Google Patents

Abstract

The utility model discloses an L-shaped bird head, which comprises a horizontal arm. The utility model discloses a horizontal arm installs the horizontal arm mounting hole after, adjusts the flexible length of horizontal arm, when wheel hub's outer circular arc edge is all pressed close to the back of bone lamella area screw hole one side and the back of expansion board, just two location reference points that the flexible length of bird head will be adjusted adjust, adjust the plane edge of pressing close to the wheel hub terminal surface to the bottom surface of bone lamella again, just be the high location reference point that the bird head will be adjusted. By utilizing the three positioning reference points, the bird head can be quickly installed, and the machine adjusting time is saved. The mounting hole setting of horizontal arm is beside the central axis of wheel hub centre bore, and horizontal arm does not receive the central axis mechanism in the wheel hub centre bore and blocks when the mounting hole is flexible, and the size of horizontal arm can be done longer, bigger, and the lifting surface area of mounting hole also becomes more steady, is difficult for being prized by the horizontal arm moreover and warp, is applicable to more not unidimensional tire.

Description

L-shaped bird head

Technical Field

The utility model relates to a tire dismouting technical field specifically is a L style of calligraphy bird head.

Background

At present, the common tire dismounting and mounting modes of the machine are as follows:

1. the medium and small-sized automobiles adopt the integrated die-casting bird head which is temporarily fixed and locked, and the tires are disassembled and assembled in a rotating hub mode. The disadvantages are that: the surfaces of the tire bead and the bird head scrape each other forcibly, the bird head and the upper edge of the hub directly bear the tensile force from the radial direction of the end surface of the tire and the pressure from the axial direction of the end surface of the tire in the front of the relative movement direction, so that the resistance of the bird head during working is increased, and the power of the machine is inevitably increased to drive the machine to work. For explosion-proof tires of partial vehicle types, various auxiliary arms are additionally arranged for matching, and the tires can be assembled and disassembled only through multiple times of lubrication and repeated trial operation. However, when the last small tire bead of the upper tire layer is almost completely installed in the groove of the wheel hub, the situation that the small tire bead of the uppermost tire layer is scratched and cracked by the metal supporting plate at the front end of the bird head is easily caused in the moment that the small tire bead of the uppermost tire layer falls into the groove of the wheel hub due to the fact that the small tire bead is tightly attached to and scraped by the bottom plate in front of the bird head.

2. The tires of some large and medium-sized automobiles are disassembled in a manner of rotating crowbars, and then are installed in a manner of rotating bird heads, so that the operation steps are more. The disadvantages are that: when the crowbar just starts to rotate, the tire bead is easily scratched because the crowbar forcibly drags and scrapes the tire bead; when the tire is installed, the bird head similar to a sharp right angle, an arrow head shape and a front shovel type is rotated to install the tire, the front of the bird head also bears the weight of supporting the tire seam allowance, the front end of the bird head in the moving direction is pressed on the wheel hub to damage the wheel hub, meanwhile, the bird head is influenced by the tensile force of the tire seam allowance in the radial direction of the end face of the tire, the resistance in the pushing direction of the bird head is increased, and the bird head can normally work only by necessarily increasing the power of the machine. However, in the process of installing the tire, the tire bead can be accidentally stuck into a narrow gap between the bottom of the metal supporting plate in front of the bird head and the upper edge of the hub, so that the tire bead is damaged.

3. In addition, some large and medium-sized automobiles adopt a rotary hub tire, and the tire is disassembled and assembled in a pull hook type bird head and roller wheel mode, and the heavy hub and the heavy tire need to be rotated, so that the power of the machine is necessarily larger. The disadvantages are that: when the tire is disassembled, the partial tire bead of the upper layer is pulled up by using the draw hook, the hub and the tire are rotated, the tire bead of the upper layer is disassembled by the draw hook in a mode of forcibly pulling and rubbing the tire bead, the tire bead of the upper layer is easily damaged in such a pulling and rubbing disassembling mode, then the partial tire bead of the lower layer is forcibly jacked up by using a roller at the bottom of the tire by using a machine, the tire bead of the lower layer is disassembled together by matching with the draw hook which pulls up the tire bead before, and the tire bead of the lower layer is also easily damaged in a mode that the hub and the tire bead are tightly attached and disassembled. When the tire is installed, the tire beads of the upper layer and the lower layer are forcibly pressed into the groove of the hub by using a single roller, and because the hub and the tire beads in the process are tightly attached, if the tire with a smaller bead or a thicker wall thickness is encountered, the tire can be installed by multiple times of lubrication and repeated attempts. However, sometimes, the tire cannot be timely installed in the groove of the hub along with the roller, the roller and the outer arc edge of the hub form an included angle similar to a shear edge, and the roller can crush the rim of the tire in a cutting mode. Moreover, the old tires with a certain service life are basically afraid of being assembled and disassembled by the machine because the materials are aged and become brittle, otherwise, the probability of damaging the tire seam is very high.

The above-mentioned conventional methods of assembling and disassembling the tire by the machine and the bird's head used therein are liable to damage the tire bead accidentally at the intersection of the tire bead and the rim of the hub. Particularly, when the tire is disassembled and assembled in a severe cold area, a lubricant with moisture needs to be smeared between the edge of the wheel hub and the rim of the tire in a low-temperature environment, so that ice-shaped objects are accumulated in a gap between the rim of the tire and the wheel hub, the difficulty in disassembling and assembling the tire is increased if the ice-shaped objects cannot be broken first, the rim of the tire is directly attached to the wheel hub, the toughness of the tire material in the low-temperature environment is reduced and becomes brittle, the rim of the tire is easy to crack and damage in the disassembling and assembling process, inconvenience is brought to an operator, and meanwhile, negative psychological shadow and unnecessary economic loss are caused to the user. Therefore, an L-shaped bird head is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a L style of calligraphy bird head to solve the problem of proposing among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a L style of calligraphy bird head, includes horizontal arm, the inside embedding of horizontal arm front end has the hone lamella, the reinforcing plate is installed to the higher authority of hone lamella, one side that horizontal arm was kept away from to the hone lamella is provided with preceding push pedal, one side that preceding push pedal was kept away from to the hone lamella is provided with the screw hole, the internally mounted of screw hole has the screw, the outer cylinder surface mounting of screw has the bearing, the outside of hone lamella and be provided with expansion plate between screw hole and preceding push pedal.

Preferably, the horizontal arm, the bone plate, the reinforcing plate, the front push plate and the expansion plate are integrally formed.

Preferably, the horizontal arm is disposed in an "L" shape with the bone plate and the reinforcement plate.

Preferably, the outer surface of the bone plate on the side with the screw hole is provided with an arc surface with an inclined bulge, and all corner positions and joints are smoothly polished.

Preferably, all corners and joints of the reinforcing plate are smoothly polished.

Preferably, the outer surface of the front pushing plate contacting with the tire sub-opening area is provided with a convex circular arc surface, and all corner positions and joints are smoothly polished.

Preferably, the convex arc surface of the front pusher contacting the tire sub-opening area can be replaced by a rollable outer cylindrical surface of a roller or bearing.

Preferably, the front thrust plate is arranged in front of the bearing with respect to the direction of movement of the hub.

Preferably, the expansion plate is arranged on the outer side of the bone plate between the bearing and the front push plate and is the most critical part for protecting the tire seam allowance from being damaged in the process of assembling and disassembling the tire.

Preferably, the outer surface of the expansion plate contacting the tire sub-opening area is provided with a convex arc surface, and all corner positions and joints are smoothly polished.

Preferably, the utility model discloses the bird head is when the dismouting tire, wheel hub's outer circular arc edge is pressed close to at the back of bone plate area screw hole one side and the back of expansion board, simultaneously, the relative motion is done with wheel hub to the outward flange of the same one side wheel hub terminal surface with the expansion board to the bottom surface of preceding push pedal is pressed close to.

Preferably, the utility model discloses the bird head is when dismouting tire, the bird head receives and mainly concentrates on the outer face of cylinder of bearing from tire terminal surface axial direction's pressure, the bird head receives and mainly concentrates on expansion plate and preceding push pedal bellied arc surface respectively from tire terminal surface radial direction's pressure.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model discloses a horizontal arm installs the horizontal arm mounting hole after, adjusts the flexible length of horizontal arm, when wheel hub's outer circular arc edge is all pressed close to the back of bone lamella area screw hole one side and the back of expansion board, just two location reference points that the flexible length of bird head will be adjusted adjust, adjust the plane edge of pressing close to the wheel hub terminal surface to the bottom surface of bone lamella again, just be the high location reference point that the bird head will be adjusted. By utilizing the three positioning reference points, the bird head can be quickly installed, the machine adjusting time is saved, and the working efficiency is improved.

2. The utility model discloses the mounting hole setting of horizontal arm is on the central axis next door of wheel hub centre bore, and horizontal arm does not receive the central axis mechanism in the wheel hub centre bore and blocks when the mounting hole is flexible, and the size of horizontal arm can be done longer, bigger, and the lifting surface area of mounting hole also becomes bigger more steady, is difficult for being prized by the horizontal arm to warp in addition, is applicable to more not unidimensional tire.

3. The utility model discloses the bird head is when the dismouting tire, and the expansion board can expand the tire in advance, and forces nature separation wheel hub and tire bead to hug closely together, greatly reduced to the spoilage of the different kind of tire bead of dismouting. High-end tires and special tires such as high-strength run-flat tires, ultra-wide tread tires and thickened heavy-duty tires can be easily disassembled and assembled.

4. The utility model discloses the bearing of bird head uses screw locking fixed, when bearing or screw damage, can quick replacement screw or bearing, maintains simply, saves use cost.

5. When the L-shaped bird head is used for disassembling the tire, the stress point of the bird head in the axial direction of the end surface of the tire is mainly concentrated on the bearing; when the tire is installed, the stress point of the bird head in the axial direction of the end face of the tire is mainly concentrated at the bottom of the bearing, so that the uncertainty of the bird head in the form of a large-amplitude seesaw with the horizontal arm as the central point is effectively reduced, the reliability of the bird head in working is enhanced, the resistance of the bird head during tire dismounting is reduced, the service power of a machine is reduced, the manufacturing cost is also reduced, and the energy consumption is reduced.

6. The utility model discloses the bird's head is when severe cold area dismouting tire, the ice-like thing above tire bead and the wheel hub can be broken away in advance to preceding push pedal, and simultaneously, the expansion board is placed in the gap between the indent edge of wheel hub's outer circular arc edge and tire bead, can break away the ice-like thing in the gap between tire bead and the wheel hub, and expand the tire bead properly, separate tire bead and wheel hub and compulsory prevent the unexpected gap between the bottom of push pedal and the wheel hub upper edge of creeping into of tire bead, prevent that the bird's head from damaging the tire bead and avoided the tire bead to directly paste tight wheel hub dismouting effectively and cause tire bead fracture damage.

7. The utility model discloses when the bird head is installing the tire, put partial tire in the bottom of bird head bearing, the drive bird head encircles the outer circular arc edge walking of wheel hub, or the position of temporarily fixed locking bird head, rotatory wheel hub, let the outer circular arc edge of wheel hub pass through the three location reference point of bird head, at this moment, the protruding arc surface of preceding push pedal bulldozes the tire bead that will be packed into in the wheel hub recess to the edge outside of wheel hub in advance (can replace the protruding arc surface of preceding push pedal with the outer cylinder surface that the pulley can roll), simultaneously, the protruding arc surface of expansion board separates properly the tire bead of impressing in the wheel hub recess with wheel hub, and in the gap between the bottom of preceding push pedal and the wheel hub upper edge of compulsory prevention tire bead unexpected drilling, prevent that the bird head from haring tire bead, and simultaneously, the bottom of the bearing of bird head one side is pressed on the tire bead, impress the tire bead in the recess of wheel hub with the rolling mode, the tire bead is effectively prevented from being accidentally cracked and damaged at the intersection of the tire bead and the edge of the hub due to the fact that the tire is pressed downwards by the self weight of the tire, the bending angle of the tire bead is too large, and the bearing is pressed downwards too tightly. Compared with an integral die-casting bird head, or a bird head similar to a sharp right-angle arrow-shaped front shovel type bird head, or a tire mounting mode of forcibly pulling and scraping the tire seam allowance by using a single roller and the like, the tire seam allowance is effectively prevented from being accidentally damaged.

8. The utility model discloses the bird head is when dismantling the tire, pry partial tire rim with the crowbar, let the bearing of bird head hold up partial tire rim in the below of tire rim, and let partial tire rim press on the bellied arc surface of expansion plate, drive bird head around the outer circular arc edge walking of wheel hub, or the position of temporary fixation locking bird head, rotatory wheel hub, let wheel hub's outer circular arc edge through the three location reference point of bird head, at this moment, the bellied arc surface of expansion plate separates wheel hub and tire rim in advance, and guide the tire rim to the predetermined interface of waiting to shift out of wheel hub top edge, and simultaneously, the top of bird head's bearing pushes up below the tire rim, direct the above-mentioned guide of bearing of partial tire rim of holding up with the roll mode shifts out the wheel hub edge. Compared with the mode of forcibly pulling and scraping the tire bead by using an integrated die-casting bird head, or using a rotary crowbar, or using a rotary hub tire and the like, the mode of disassembling the tire can more effectively avoid accidentally damaging the tire bead.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is an exploded view of the present invention.

In the figure: 1 horizontal arm, 2 bone plates, 3 reinforcing plates, 4 front push plates, 5 screw holes, 6 screws, 7 bearings and 8 expansion plates.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, an L-shaped bird head includes a horizontal arm 1, a bone plate 2 is embedded in the front end of the horizontal arm 1, a reinforcing plate 3 is installed on the bone plate 2, a front push plate 4 is installed on one side of the bone plate 2 away from the horizontal arm 1, a screw hole 5 is installed on one side of the bone plate 2 away from the front push plate 4, a screw 6 is installed in the screw hole 5, a bearing 7 is installed on the outer cylindrical surface of the screw 6, and an expansion plate 8 is installed on the outer side of the bone plate 2 and between the screw hole 5 and the front push plate 4.

In the specific implementation, the horizontal arm 1, the bone plate 2, the reinforcing plate 3, the front push plate 4 and the expansion plate 8 are integrally formed, and the horizontal arm 1, the bone plate 2 and the reinforcing plate 3 are arranged in an L shape.

In the specific implementation, the outer surface of the bone plate 2 with the screw hole 5 is provided with an arc surface with an inclined bulge, and all corners and joints are smoothly polished.

In the specific implementation, all corners and joints of the reinforcing plate 3 are smoothly polished.

In the specific implementation, the outer surface of the front push plate 4 contacting the tire sub-opening area is provided with a convex arc surface, and all corner positions and joints are smoothly polished.

In practice, the convex arc surface of the front pusher 4 contacting the tire sub-opening area can be replaced by a rollable outer cylindrical surface of a roller or bearing.

In the specific implementation, the front push plate 4 is arranged in front of the bearing 7 relative to the movement direction of the hub.

In practical application, the expansion plate 8 is arranged on the outer side of the bone plate 2 between the bearing 7 and the front push plate 4, and is the most critical part for protecting the tire bead from being damaged in the process of assembling and disassembling the tire.

In the specific implementation, the outer surface of the expansion plate 8 contacting the tire sub-opening area is provided with a convex arc surface, and all corner positions and joints are smoothly polished.

In the specific implementation, when the L-shaped bird head works, the back surface of one side of the bone plate 2 with the screw hole 5 and the back surface of the expansion plate 8 are close to the outer circular arc edge of the hub, and meanwhile, the bottom surface of the front push plate 4 is close to the outer edge of the end surface of the hub on the same side with the expansion plate 8 and moves relative to the hub.

In practical application, when the L-shaped bird head works, the pressure applied to the bird head from the axial direction of the end surface of the tire is mainly concentrated on the outer cylindrical surface of the bearing 7, and the pressure applied to the bird head from the radial direction of the end surface of the tire is mainly concentrated on the convex arc surfaces of the expansion plate 8 and the front push plate 4 respectively.

Use the utility model discloses during L style of calligraphy bird head, horizontal arm 1 installs behind the horizontal arm mounting hole, adjusts horizontal arm 1's flexible length, when wheel hub evagination circular arc edge is all pressed close to at the back of 2 take screw holes 5 of hone lamella and the back of expansion plate 8, is exactly that the location reference point of two positions that the length that stretches out and draws back before the dismouting tire of bird head will be adjusted, adjusts the plane edge of pressing close to the wheel hub terminal surface to 2 bottom surfaces of hone lamella of horizontal arm 1 again, is exactly that the bird head will adjust the high location reference point. By utilizing the three reference positioning points, the bird head can be quickly installed, and the time for adjusting the machine is saved.

The mounting hole of horizontal arm 1 sets up on the central axis next door of wheel hub centre bore, and horizontal arm 1 does not receive the central axis mechanism in the wheel hub centre bore to block when the mounting hole is flexible, and horizontal arm 1's size can be done longer, bigger, and the lifting surface area of mounting hole also becomes more steady, is difficult for being prized by horizontal arm 1 moreover and warp, is applicable to more not unidimensional tire.

The bearing 7 of bird head uses screw 6 locking to fix, when meetting bearing 7 or screw 6 and damaging, can quick replacement bearing 7 or screw 6, has saved the use cost of changing whole bird head.

Because the expansion plate 8 and the front push plate 4 of the bird head do not bear the weight of supporting the tire, the stress of the expansion plate 8 and the front push plate 4 in the axial direction of the end surface of the tire is small, and when the tire is disassembled, the stress point of the bird head in the axial direction of the end surface of the tire is mainly concentrated on the bearing 7; when the tire is installed, the stress point of the bird head in the axial direction of the end face of the tire is mainly concentrated at the bottom of the bearing 7, so that the uncertainty of the bird head in the form of a large-amplitude seesaw with the horizontal arm 1 as a central point is effectively reduced, the reliability of the bird head in working is enhanced, the resistance of the bird head during tire dismounting is reduced, the service power of a machine is reduced, the manufacturing cost is also reduced, and the energy consumption is reduced.

When the tire is installed, a part of the tire is placed at the bottom of the bird head bearing 7 to drive the bird head to walk around the outer circular arc edge of the hub or temporarily fix and lock the position of the bird head, the hub is rotated to enable the outer circular arc edge of the hub to pass through three reference positioning points of the bird head, at this time, the convex circular arc surface of the front push plate 4 is expanded in advance and pushes the tire bead to be installed in the groove of the hub to the outside of the edge of the hub (the convex circular arc surface of the front push plate 4 can be replaced by the outer circular arc surface which can be rolled by a pulley), meanwhile, the convex circular arc surface of the expansion plate 8 properly separates the tire bead which is being pressed into the groove of the hub from the hub, and forcibly prevents the tire bead from accidentally drilling into the gap between the bottom of the front push plate 4 and the upper edge of the hub to prevent the bird head from damaging the tire bead, meanwhile, the bottom of the bearing 7 at one side of the bird head is pressed on the tire bead, and the tire bead is pressed into the groove of the hub in a rolling manner, the tire bead is effectively prevented from being accidentally cracked and damaged at the intersection of the tire bead and the edge of the hub due to the fact that the tire is pressed downwards by the self weight of the tire, the bending angle of the tire bead is too large, and the bearing 7 is pressed downwards too tightly. Particularly, when the tire is disassembled and assembled in a severe cold area, a lubricant with water needs to be coated between the edge of the hub and the bead of the tire in a low-temperature environment, so that ice-shaped objects are generated in a gap between the bead of the tire and the hub, the front push plate 4 can break ice blocks on the bead of the tire and the hub in advance, the expansion plate 8 is placed in the gap between the outer arc edge of the hub and the inner concave edge of the bead of the tire, the ice blocks in the gap between the bead of the tire and the hub can be broken, the bead of the tire is properly expanded, the bead of the tire is separated from the hub, the bead of the tire is forcibly prevented from accidentally drilling into the gap between the bottom of the front push plate 4 and the upper edge of the hub, the bead of the tire is prevented from being damaged by a bird's head, and the bead of the tire is effectively prevented from being directly attached to the hub to be disassembled and assembled and disassembled to cause the cracking damage of the bead of the tire.

When dismantling the tire, the installation is good the utility model discloses a L style of calligraphy bird head, pry partial tire bead with the crowbar, let the bearing 7 of bird head hold up partial tire bead in the below of tire bead, and let partial tire bead press on the bellied arc surface of expansion plate 8, the drive bird head encircles the outer circular arc edge walking of wheel hub, or the position of temporary fixation locking bird head, rotatory wheel hub, let wheel hub's outer circular arc edge pass through the three setpoint of referring to of bird head, at this moment, the bellied arc surface of expansion plate 8 separates wheel hub and tire bead in advance, and guide the predetermined interface of waiting to shift out of wheel hub top edge to the tire bead, and simultaneously, the top of bird head's bearing 7 pushes up below the tire bead, direct the above-mentioned guide of bearing 7 of following of partial tire bead that holds up with the roll mode shifts out the wheel hub edge. Particularly, when the tire is disassembled and assembled in a severe cold area, a lubricant with moisture needs to be coated between the edge of the hub and the seam of the tire in a low-temperature environment, so that ice-shaped objects are generated in the gap between the seam of the tire seam and the hub, the front push plate 4 can break ice blocks on the tire seam and the hub in advance, the expansion plate 8 is placed in the gap between the outer arc edge of the hub and the inner concave edge of the tire seam, the ice blocks in the gap between the tire seam and the hub can be broken, the tire seam is properly expanded, and compared with a tire disassembling mode of forcibly pulling and scraping the tire seam by using an integrated die-casting bird head, a rotary crowbar or a rotary hub tire and the like, the accidental damage to the tire seam is effectively avoided.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (12)

1. An L style of calligraphy bird head which characterized in that: including horizontal arm (1), the inside embedding of horizontal arm (1) front end has hone lamella (2), reinforcing plate (3) are installed to the higher authority of hone lamella (2), one side that horizontal arm (1) was kept away from in hone lamella (2) is provided with preceding push pedal (4), one side that preceding push pedal (4) were kept away from in hone lamella (2) is provided with screw hole (5), the internally mounted of screw hole (5) has screw (6), the outer cylinder surface mounting of screw (6) has bearing (7), the outside of hone lamella (2) just is provided with expansion plate (8) between screw hole (5) and preceding push pedal (4).

2. An L-shaped bird head according to claim 1, wherein: the horizontal arm (1), the bone plate (2), the reinforcing plate (3), the front push plate (4) and the expansion plate (8) are integrally formed.

3. An L-shaped bird head according to claim 1, wherein: the horizontal arm (1), the bone plate (2) and the reinforcing plate (3) are arranged in an L shape.

4. An L-shaped bird head according to claim 1, wherein: the outer surface of one side of the bone plate (2) with the screw hole (5) is provided with an inclined convex arc surface, and all corner positions and joints are polished smoothly.

5. An L-shaped bird head according to claim 1, wherein: and all corner positions and joints of the reinforcing plate (3) are smoothly polished.

6. An L-shaped bird head according to claim 1, wherein: the outer surface of the front push plate (4) contacting with the tire sub-opening area is provided with a convex arc surface, and all corner positions and joints are smoothly polished.

7. An L-shaped bird head according to claim 1, wherein: the convex arc surface of the front pushing plate (4) contacting the tire sub-opening area can be replaced by a rollable outer cylindrical surface of a roller or a bearing.

8. An L-shaped bird head according to claim 1, wherein: the front push plate (4) is arranged in front of the bearing (7) relative to the movement direction of the hub.

9. An L-shaped bird head according to claim 1, wherein: the expansion plate (8) is arranged on the outer side of the bone plate (2) between the bearing (7) and the front push plate (4), and is the most critical part for protecting the tire bead from being damaged in the tire dismounting process.

10. An L-shaped bird head according to claim 1, wherein: the outer surface of the expansion plate (8) contacting the tire sub-opening area is provided with a convex arc surface, and all corner positions and connecting positions are smoothly polished.

11. An L-shaped bird head according to claim 1, wherein: the back of bone lamella (2) area screw hole (5) one side and the outer circular arc edge of wheel hub is pressed close to the back of expansion board (8), the outer fringe with expansion board (8) same side wheel hub terminal surface is pressed close to the bottom surface of preceding push pedal (4), is relative motion with wheel hub.

12. An L-shaped bird head according to claim 1, wherein: the pressure of the bird head from the axial direction of the end face of the tire is mainly concentrated on the outer cylindrical surface of the bearing (7), and the pressure of the bird head from the radial direction of the end face of the tire is mainly concentrated on the arc surfaces of the expansion plate (8) and the front push plate (4) in a protruding mode.

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