CN112373555B

CN112373555B - Self-protection automobile steering shaft

Info

Publication number: CN112373555B
Application number: CN202011294121.3A
Authority: CN
Inventors: 王虎
Original assignee: Hangzhou Linda Auto Fittings Co ltd
Current assignee: Hangzhou Linda Auto Fittings Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2022-03-25
Anticipated expiration: 2040-11-18
Also published as: CN112373555A

Abstract

The application relates to a self-protection automobile steering shaft which comprises a first rotating shaft and a second rotating shaft, wherein the first rotating shaft and the second rotating shaft are connected through a cross shaft, and a self-protection mechanism is arranged at one end, far away from the second rotating shaft, of the first rotating shaft; the self-protection mechanism comprises a transmission shaft, a plurality of clamping grooves are formed in the transmission shaft, a pressing transmission mechanism is sleeved on the transmission shaft, the pressing transmission mechanism comprises an annular supporting sleeve, and sealing plates are arranged at two ends of the supporting sleeve in the length direction; support and be provided with a plurality of backup pads in the cover, be provided with the compressed particleboard between two adjacent backup pads, the compressed particleboard is kept away from and is supported cover one side and be provided with the block strip that is arranged in the joint groove of joint, and compressed particleboard and support are provided with between the cover and make the compressed particleboard keep away from the pressure spring that supports the cover, compressed particleboard, support and form the high pressure oil pocket between cover, closing plate and the backup pad, are provided with oiling mechanism on the support cover. The application has the effect of preventing the steering shaft from being broken due to overlarge torque.

Description

Self-protection automobile steering shaft

Technical Field

The application relates to the field of steering shaft processing equipment, in particular to a self-protection automobile steering shaft.

Background

At present relevant auto steering axle includes first pivot and second pivot, the fixed a pair of first lug that is equipped with of one end of first pivot, all be provided with first shaft hole on two first lugs, the one end of second pivot is fixed with a pair of second lug, all be provided with the secondary shaft hole on two second lugs, be connected with a cross axle through the bearing rotation on two first shaft holes, rotate through the pivot between two other free ends of cross axle and the secondary shaft hole and be connected, all be provided with the draw-in groove on first shaft hole and the secondary shaft hole simultaneously, the delivery has connect the opening gasket in the draw-in groove, a pair of double-layered hole that is used for the centre gripping is provided with on the opening gasket, be used for preventing that the bearing from dropping.

In view of the above-described related art, the inventors have considered that there is a defect that a hostile rotating shaft, a second rotating shaft or a cross shaft is easily broken when the torque is excessively large, thereby causing a reduction in the service life of the steering shaft.

Disclosure of Invention

In order to guarantee the life of steering spindle, this application provides a car steering spindle of self preservation protection.

The application provides a self-protection automobile steering shaft adopts following technical scheme:

a self-protection automobile steering shaft comprises a first rotating shaft and a second rotating shaft, wherein the first rotating shaft and the second rotating shaft are connected through a cross shaft, and a self-protection mechanism is arranged at one end, far away from the second rotating shaft, of the first rotating shaft;

the self-protection mechanism comprises a transmission shaft fixed at one end of the first rotating shaft, which is far away from the first rotating shaft, a plurality of clamping grooves are formed in the transmission shaft, a pressing transmission mechanism on the rotating shaft is sleeved on the transmission shaft, the pressing transmission mechanism comprises an annular supporting sleeve, and sealing plates are arranged at two ends of the supporting sleeve in the length direction;

support and be provided with a plurality of backup pads in the cover, be provided with the compressed particleboard between two adjacent backup pads, the compressed particleboard is kept away from and is supported cover one side and be provided with the block strip that is arranged in the joint groove, and compressed particleboard and support are provided with between the cover and make the compressed particleboard keep away from the pressure spring that supports the cover, form the high pressure oil pocket between compressed particleboard, support cover, closing plate and the backup pad, be provided with oiling mechanism on the support cover.

By adopting the technical scheme, high-pressure oil is injected into the high-pressure oil cavity through the oil injection mechanism, so that the pressing plate is pressed on the supporting plate, and meanwhile, the clamping strips are embedded into the clamping grooves, so that the transmission sleeve rotates and simultaneously drives the clamping strips embedded into the clamping grooves to rotate, and the pressing plate and the supporting sleeve are driven to rotate; when the transmission moment of torsion was too big, the block strip was ejecting from the block groove to make the production clearance between compressed particleboard and the backup pad, thereby make the hydraulic oil of high-pressure oil intracavity flow into between transmission cover and the compressed particleboard, thereby make the compressed particleboard receive insufficient pressure and can't take place the transmission with the transmission cover, thereby make output shaft stall, and then prevented that the load is too big, the moment of torsion is too big and make first pivot, cross axle or second pivot fracture.

Preferably, the oiling mechanism comprises an oiling port and a sealing port, an oiling pipe communicated with the high-pressure oil cavity is arranged on the side wall of the oiling port, a sealing screw is screwed in the sealing port, and the sealing screw extends into the oiling pipe.

By adopting the technical scheme, the sealing screw is rotated to withdraw from the oil filling pipe, so that the oil filling pipe is communicated, oil is filled into the sealing cavity through the oil filling port, the sealing screw is screwed into the oil filling pipe to seal the oil filling pipe after the required value of the oil pressure is reached, so that the errors of the real oil pressure and the preset oil pressure in the high-pressure oil cavity are ensured, and further, when the torque on a rotating shaft reaches the preset value, the pressing plate can be timely pushed open, so that the normality of the self-protection function is ensured, meanwhile, the oil pressure can be prevented from being too low, and the pressing plate is opened when the required torque is not reached, so that the transmission function is lost.

Preferably, a sealing sleeve is detachably connected in the oil filling port, and a rubber ring is arranged on the outer side wall of the sealing sleeve.

By adopting the technical scheme, the sealing sleeve and the rubber ring are arranged to prevent external dust from entering, so that the high-pressure oil cavity is prevented from being polluted, and the normal operation of the self-protection function is ensured.

Preferably, a first flange plate is fixed at one end of the transmission shaft, a second flange plate is fixed on the side wall of the first rotating shaft, which is far away from one side of the second rotating shaft, and the first flange plate and the second flange plate are fixedly connected through bolts.

By adopting the technical scheme, the transmission shaft and the second transmission shaft can be detachably connected, and then the steering shaft can be maintained by replacing the whole self-protection mechanism, so that the self-protection function of the steering shaft and the normality of the transmission function are ensured.

Preferably, one side of the transmission shaft, which is far away from the first flange plate, is detachably connected with a transmission sleeve through a pin piece, and the clamping groove is formed in the transmission sleeve.

Through adopting above-mentioned technical scheme, the block groove sets up on the transmission cover to make block strip and block groove transition wearing and tearing back, can change the normality that the transmission kinetic energy was guaranteed to the transmission cover alone.

Preferably, the sealing plate is an annular plate, the sealing plate is fixedly connected with the support sleeve in a sealing mode through a bolt, and the sealing plate is rotatably connected with the transmission shaft through a bearing.

Through adopting above-mentioned technical scheme, the closing plate passes through the bolt and supports through bolt fixed connection between the cover to in pull down the closing plate from supporting the cover, thereby be convenient for maintain the change to the part in the supporting sleeve, rotate through the bearing between closing plate and the transmission shaft simultaneously and connect, thereby play the centering supporting role to supporting the cover, and then prevented the contact between backup pad and the transmission shaft, thereby guaranteed the normal of self preservation protect function.

Preferably, an oil overflow port is formed in the transmission sleeve, an oil overflow pipe is arranged on the transmission shaft, a plurality of oil inlets are formed in one end, away from the second rotating shaft, of the first rotating shaft, the oil inlets are evenly formed in the axial direction of the first rotating shaft, oil outlets are formed in the joint of the first rotating shaft and the cross shaft, an oil conveying pipe is arranged in the first rotating shaft, and two ends of the oil conveying pipe are connected with the oil inlets and the oil outlets respectively.

By adopting the technical scheme, the hydraulic oil in the high-pressure oil cavity is guided to the oil inlet through the oil overflow port and then is guided to the oil outlet through the oil conveying pipe, and the cross shaft is lubricated, so that the transmission stability is ensured, and meanwhile, the hydraulic oil is saved.

Preferably, one side of the second rotating shaft, which is far away from the first rotating shaft, is provided with an insertion groove, an inner gear ring for clamping the steering wheel is arranged in the insertion groove, and a dislocation buffer mechanism is arranged in the insertion groove, which is close to one side of the first rotating shaft, of the inner gear ring.

Through adopting above-mentioned technical scheme for in the inserting groove is arranged in to the steering wheel is scalable, and take place the transmission with interior ring gear, and then drive the second pivot and rotate, the buffer gear that misplaces simultaneously can play the cushioning effect to the axial atress of second pivot, thereby has guaranteed the axial force of second pivot.

Preferably, dislocation buffer gear includes that it sets gradually to first pivot direction along the second pivot, reversible buffering subassembly and irreversible buffering subassembly, reversible buffering subassembly is including fixing the butt joint piece on the inserting groove inner wall, be provided with buffer spring between butt joint piece and the interior ring gear, be provided with the fracture groove on the butt joint piece.

Through adopting above-mentioned technical scheme, dislocation buffer gear includes reversible buffering subassembly and irreversible buffering subassembly, and when receiving the impact force less, after reversible buffering subassembly cushions the absorbed energy, accessible buffer spring resumes the normal use to guarantee the steering spindle.

Preferably, a buffer tube is arranged between the abutting block and the bottom wall of the splicing groove, the buffer tube is a hollow thin-walled tube, and a plurality of rhombic holes are formed in the side wall of the buffer tube.

Through adopting above-mentioned technical scheme, receive the collision back when the vehicle, earlier absorb the impact force through buffer spring buffering and prevent crowded driver that hurts, make the butt joint piece along the extrusion on the buffer tube after the rupture groove fracture when assaulting simultaneously too greatly for the buffer tube takes place plastic deformation, after absorbing the impact force, can not rebound and make personnel receive the secondary injury.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the self-protection mechanism is used for preventing the first rotating shaft, the second rotating shaft and the cross shaft from being broken due to overlarge torque of the steering shaft;

2. the axial stress of the second rotating shaft is buffered through the dislocation buffering mechanism, so that the protection effect on a steering shaft is achieved, and meanwhile, the protection effect on a driver is achieved.

Drawings

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

Fig. 2 is an overall sectional view of the present embodiment.

Fig. 3 is a schematic view of the internal structure of the self-protection mechanism in this embodiment.

Fig. 4 is an enlarged schematic view of a portion a of fig. 3.

Fig. 5 is a sectional view of the steering shaft in the present embodiment for showing the oil passage.

Description of reference numerals: 1. a first rotating shaft; 2. a second rotating shaft; 3. a cross shaft; 4. a self-protection mechanism; 5. a drive shaft; 6. a support sleeve; 7. a first flange plate; 8. a second flange plate; 9. a transmission sleeve; 10. a clamping groove; 11. a support plate; 12. pressing the plywood; 13. clamping the strip; 14. a pressure spring; 15. a sealing plate; 16. a high pressure oil chamber; 17. an oiling mechanism; 18. an oil filling port; 19. sealing the opening; 20. an oil filling pipe; 21. a seal screw; 22. sealing sleeves; 23. a rubber ring; 24. a fitting groove; 25. an output shaft; 26. a third flange plate; 27. an oil overflow port; 28. an oil spill pipe; 29. an oil inlet; 30. an oil outlet; 31. an oil delivery pipe; 32. inserting grooves; 33. an inner gear ring; 34. a dislocation buffer mechanism; 35. a reversible buffer assembly; 36. a non-reciprocal cushioning component; 37. a butting ring; 38. a butting table; 39. a butting block; 40. a breaking groove; 41. a buffer spring; 42. a buffer tube; 43. and (4) diamond holes.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses self-protection automobile steering shaft. Referring to fig. 1, a self-protecting steering shaft for an automobile comprises a first rotating shaft 1 and a second rotating shaft 2, wherein the first rotating shaft 1 and the second rotating shaft 2 are in transmission connection through a cross shaft 3. One end of the first rotating shaft 1, which is far away from the second rotating shaft 2, is provided with a self-protection mechanism 4.

Referring to fig. 2 and 3, the self-protection mechanism 4 includes a transmission shaft 5 and a support sleeve 6 fitted over the transmission shaft 5. Be fixed with first ring flange 7 on the 5 lateral walls of transmission shaft, be fixed with second ring flange 8 on the lateral wall of 2 one sides of second pivot are kept away from to first pivot 1, pass through bolted connection between first ring flange 7 and the second ring flange 8 to make transmission shaft 5 can dismantle to fix and follow first pivot 1 rotation on first pivot 1. The transmission shaft 5 is far away from the sleeve connected with the transmission sleeve 9 on one side of the first flange plate 7, and the transmission sleeve 9 is in transmission connection with the transmission shaft 5 through a pin piece, so that the transmission sleeve 9 rotates along with the transmission shaft 5, and meanwhile, the transmission sleeve 9 can be replaced to ensure the normal transmission capacity of the transmission sleeve 9. A plurality of clamping grooves 10 are arranged on the outer side wall of the transmission sleeve 9 at equal intervals along the circumferential direction of the transmission sleeve 9. Support and be provided with a plurality of backup pads 11 on the 6 inner walls of cover, backup pad 11 is along supporting 6 circumference evenly distributed, and backup pad 11 along supporting the radial setting of cover 6 to make the distance between two adjacent backup pads 11 along keeping away from supporting 6 directions of cover and reducing gradually. A gap is arranged between the support plate 11 and the transmission sleeve 9, and the gap in the embodiment is 4-6mm, so that the support plate 11 is prevented from rotating along with the transmission sleeve 9. Be provided with compressed particleboard 12 between two adjacent backup pads 11, the cross section of compressed particleboard 12 is fan ring shape, and compressed particleboard 12 is kept away from and supports 6 one end of cover and is fixed with the block strip 13 that is used for the joint in block groove 10. The maximum width of the cross section of the pressed plate 12 is greater than the minimum distance between two adjacent support plates 11, a pressure spring 14 is abutted between the pressed plate 12 and the support sleeve 6, the pressure spring 14 enables the side wall of the pressed plate 12 to abut against the support plates 11, so that a sealing state is achieved, and meanwhile, the clamping strip 13 is compressed in the clamping groove 10. The two ends of the supporting sleeve 6 in the length direction are fixedly connected with sealing plates 15 through screw sealing, and the sealing plates 15 are annular plates. The sealing plate 15 is connected with the transmission shaft 5 through a bearing, so that the sealing plate 15 does not rotate along with the transmission shaft 5, and simultaneously, the transmission sleeve 9 is supported, and the contact between the supporting plate 11 and the transmission sleeve 9 is avoided.

Referring to fig. 2 and 3, a high-pressure oil chamber 16 is formed among the pressing plate 12, the support sleeve 6, the sealing plate 15 and the support plate 11, and an oil injection mechanism 17 for injecting oil into the high-pressure oil chamber 16 is provided on the support sleeve 6. High-pressure oil is injected into the high-pressure oil chamber 16 through the oil injection mechanism 17, so that the pressing plate 12 is pressed on the support plate 11, and meanwhile, the clamping strip 13 is embedded into the clamping groove 10, so that the transmission sleeve 9 rotates and simultaneously drives the clamping strip 13 embedded into the clamping groove 10 to rotate, and the pressing plate 12 and the support sleeve 6 are driven to rotate. When the transmission torque is too big, the clamping strip 13 is ejected out from the clamping groove 10, so that a gap is generated between the pressing plate 12 and the support plate 11, so that hydraulic oil in the high-pressure oil chamber 16 flows into the space between the transmission sleeve 9 and the pressing plate 12, and the pressing plate 12 cannot transmit with the transmission sleeve 9 due to insufficient pressure, so that the output shaft 25 stops rotating, the load is prevented from being too big, and the torque is too big so that the first rotating shaft 1, the cross shaft 3 or the second rotating shaft 2 is broken.

Referring to fig. 3 and 4, the oil injection mechanism 17 includes an oil injection port 18 and a seal port 19 provided on the outer side wall of the support sleeve 6. A filler pipe 20 communicating with the high-pressure oil chamber 16 is provided on a side wall of the seal port 19. The cross section of the whole of the sealing opening 19 and the oil filling pipe 20 is Y-shaped, a sealing screw 21 is screwed in the sealing opening 19, and the sealing screw 21 is lifted into the oil filling pipe 20 by rotating the sealing screw 21 to block the oil filling pipe 20, so that the effect of sealing the oil filling pipe 20 is achieved. The sealing screw 21 is rotated to withdraw the sealing screw 21 from the oil filling pipe 20, so that the oil filling pipe 20 is communicated, oil is filled into the sealing cavity through the oil filling port 18, and after the oil pressure requirement value is reached, the sealing screw 21 is screwed into the oil filling pipe 20 to close the oil filling pipe 20, so that the error between the real oil pressure and the preset oil pressure in the high-pressure oil cavity 16 is ensured. The sealing sleeve 22 is connected in the oil filling opening 18 in a clamping mode, a rubber ring 23 is sleeved on the outer side wall of the sealing sleeve 22, an embedding groove 24 for embedding the rubber ring 23 is formed in the inner side wall of the oil filling opening 18 above the oil inlet pipe, therefore, the sealing sleeve 22 can be detachably connected in the oil filling opening 18, dust is prevented from polluting an oil inlet 29, and further the high-pressure oil cavity 16 is polluted to cause the function loss of the self-protection mechanism 4.

Referring to fig. 1, an output shaft 25 is fixed on the sealing plate 15 on the side of the support sleeve 6 away from the first rotating shaft 1, and a third flange 26 is arranged at one end of the output shaft 25 away from the support sleeve 6 for connecting with an external rotating shaft.

Referring to fig. 5, an oil overflow port 27 is formed in a side wall of the transmission sleeve 9, an oil overflow pipe 28 is formed in the transmission shaft 5, the oil overflow pipe 28 is communicated with the oil overflow port 27, a plurality of oil inlets 29 are formed in one side of the first rotating shaft 1, which is far away from the second rotating shaft 2, the oil inlets 29 are circumferentially arranged along an axis of the first rotating shaft 1, and when the first flange 7 and the second flange 8 are fixedly connected through bolts, the oil inlets 29 are communicated with the oil overflow pipe 28. An oil outlet 30 is arranged at the joint of the first rotating shaft 1 and the cross shaft 3, and two ends of an oil conveying pipe 31 arranged in the first rotating shaft 1 are respectively communicated with the oil inlet 29 and the oil outlet 30. Thereby make the hydraulic oil in the high-pressure oil pocket 16 lead to the oil-out 30 through the oil spilling 27, lubricate cross axle 3, thus has guaranteed the driven stability, has practiced thrift hydraulic oil simultaneously.

Referring to fig. 2 and 4, an insertion groove 32 is formed in one end, away from the first rotating shaft 1, of the second rotating shaft 2, an inner gear ring 33 for clamping a steering wheel is fixed in the insertion groove 32, and the inner gear ring 33 is detachably connected with the inner wall of the insertion groove 32 through a pin. A dislocation buffer mechanism 34 is arranged between the inner gear ring 33 and the bottom wall of the insertion groove 32 for preventing the second rotating shaft 2 from bending or breaking when the axial force of the second rotating shaft 2 is too large. While the internal gear ring 33 is detachably attached to facilitate maintenance of the misalignment damping mechanism 34.

Referring to fig. 2 and 4, the misalignment buffer mechanism 34 includes a reversible buffer member 35 and an irreversible buffer member 36, which are sequentially disposed along the direction from the inner ring gear 33 to the bottom wall of the insertion groove 32. Reversible buffer assembly 35 includes butt ring 37, is provided with the butt platform 38 that supplies butt ring 37 butt on the inserting groove 32 inner wall, and the butt ring 37 inner wall is gone up and is provided with a plurality of butt piece 39 along self circumference equidistant, is provided with fracture groove 40 between butt piece 39 and the butt ring 37. The abutting block 39 abuts against the buffer spring 41 on the side of the inner gear ring 33. So that the steering wheel is inserted into the insertion groove 32, the steering wheel abuts against the buffer spring 41, and when receiving an axial impact force, the buffer spring 41 buffers and absorbs the impact force, thereby preventing the first rotating shaft 1 from being bent under the action of the steering wheel. When the impact force is not large, the buffer spring 41 is elastically deformed, and the buffer spring 41 can restore the original working state after being deformed, so that the practical service life of the second rotating shaft 2 is ensured.

Referring to fig. 2 and 4, the irreversible buffer component 36 is a buffer tube 42 disposed between the abutting ring and the abutting groove, the buffer tube 42 is a thin-walled hollow tube, the diameter of the inner wall of the buffer tube 42 is smaller than that of the inner wall of the abutting ring, a plurality of rhombic holes 43 with rhombic cross sections are formed on the side wall of the buffer tube 42, and the rhombic holes 43 are through holes. The buffer tube 42 is made to be extremely flexible and deformable upon impact, thereby absorbing the impact force without recovering after deformation. The steering wheel is inserted into the second rotating shaft 2, after a vehicle is collided, the impact force is firstly absorbed through the buffer spring 41 to prevent a driver from being extruded and hurt, and meanwhile, after the impact force is too large, the abutting block 39 is extruded on the buffer tube 42 after being broken along the breaking groove 40, so that the buffer tube 42 is subjected to plastic deformation, and after the impact force is absorbed, the impact force cannot rebound to enable a person to receive secondary damage. When the maintenance, because of interior ring gear 33, conflict ring and buffer tube 42 are all can dismantle the connection, can be through changing butt ring 37 and buffer tube 42 to guarantee the normal use of transmission shaft 5 function.

The implementation principle of the self-protection automobile steering shaft in the embodiment of the application is as follows: high-pressure oil is injected into the high-pressure oil chamber 16 through the oil injection mechanism 17, so that the pressing plate 12 is pressed on the support plate 11, and meanwhile, the clamping strip 13 is embedded into the clamping groove 10, so that the transmission sleeve 9 rotates and simultaneously drives the clamping strip 13 embedded into the clamping groove 10 to rotate, and the pressing plate 12 and the support sleeve 6 are driven to rotate. When the transmission torque is too big, the clamping strip 13 is ejected out from the clamping groove 10, so that a gap is generated between the pressing plate 12 and the support plate 11, so that hydraulic oil in the high-pressure oil chamber 16 flows into the space between the transmission sleeve 9 and the pressing plate 12, and the pressing plate 12 cannot transmit with the transmission sleeve 9 due to insufficient pressure, so that the output shaft 25 stops rotating, the load is prevented from being too big, and the torque is too big so that the first rotating shaft 1, the cross shaft 3 or the second rotating shaft 2 is broken. At this time, the hydraulic oil in the hydraulic oil cavity is guided to the oil outlet 30 through the oil overflow port 27 to lubricate the cross shaft 3, so that the transmission stability is ensured, and meanwhile, the hydraulic oil is saved.

The steering wheel is inserted into the second rotating shaft 2, after a vehicle is collided, the impact force is buffered and absorbed by the buffer spring 41 to prevent a driver from being extruded and hurt, and meanwhile, the impact force is too large to enable the abutting block to be extruded on the buffer tube 42 after being broken along the breaking groove 40, so that the buffer tube 42 is subjected to plastic deformation, and after the impact force is absorbed, the impact force cannot rebound to enable a person to receive secondary injury.

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

Claims

1. A self-protecting automobile steering shaft is characterized in that: the self-protection mechanism comprises a first rotating shaft (1) and a second rotating shaft (2), wherein the first rotating shaft (1) and the second rotating shaft (2) are connected through a cross shaft (3), and a self-protection mechanism (4) is arranged at one end, far away from the second rotating shaft (2), of the first rotating shaft (1);

the self-protection mechanism (4) comprises a transmission shaft (5) fixed at one end of the first rotating shaft (1) far away from the first rotating shaft (1), a plurality of clamping grooves (10) are formed in the transmission shaft (5), a pressing transmission mechanism on the rotating shaft is sleeved on the transmission shaft (5), the pressing transmission mechanism comprises an annular supporting sleeve (6), and sealing plates (15) are arranged at two ends of the supporting sleeve (6) in the length direction;

support and be provided with a plurality of backup pads (11) in cover (6), be provided with between two adjacent backup pads (11) pressfitting board (12), pressfitting board (12) are kept away from and are supported cover (6) one side and be provided with block strip (13) that are arranged in joint groove (10), are provided with between pressfitting board (12) and the support cover (6) and make pressfitting board (12) keep away from pressure spring (14) that support cover (6), form high pressure oil pocket (16) between pressfitting board (12), support cover (6), closing plate (15) and backup pad (11), be provided with oiling mechanism (17) on the support cover (6).

2. The self-protecting steering shaft for vehicle of claim 1, wherein: the oiling mechanism (17) comprises an oiling port (18) and a sealing port (19), an oiling pipe (20) communicated with the high-pressure oil chamber (16) is arranged on the side wall of the oiling port (18), a sealing screw (21) is screwed in the sealing port (19), and the sealing screw (21) extends into the oiling pipe (20).

3. The self-protecting steering shaft for vehicle of claim 2, wherein: a sealing sleeve (22) is detachably connected in the oil filling port (18), and a rubber ring (23) is arranged on the outer side wall of the sealing sleeve (22).

4. The self-protecting steering shaft for vehicle of claim 1, wherein: one end of transmission shaft (5) is fixed with first ring flange (7), be fixed with second ring flange (8) on the lateral wall of second pivot (2) one side is kept away from in first pivot (1), bolt fixed connection is passed through in first ring flange (7) and second ring flange (8).

5. The self-protecting steering shaft for vehicle of claim 4, wherein: one side, far away from the first flange plate (7), of the transmission shaft (5) is detachably connected with a transmission sleeve (9) through a pin piece, and the clamping groove (10) is formed in the transmission sleeve (9).

6. The self-protecting steering shaft for vehicle of claim 5, wherein: the sealing plate (15) is an annular plate, the sealing plate (15) is fixedly connected with the support sleeve (6) in a sealing mode through bolts, and the sealing plate (15) is rotatably connected with the transmission shaft (5) through a bearing.

7. The self-protecting steering shaft for vehicle of claim 5, wherein: the oil-saving type oil-conveying mechanism is characterized in that an oil overflow port (27) is formed in the transmission sleeve (9), an oil overflow pipe (28) is arranged on the transmission shaft (5), a plurality of oil inlets (29) are formed in one end, far away from the second rotating shaft (2), of the first rotating shaft (1), the oil inlets (29) are evenly arranged along the axial direction of the first rotating shaft (1), an oil outlet (30) is formed in the joint of the first rotating shaft (1) and the cross shaft (3), an oil-conveying pipe (31) is arranged in the first rotating shaft (1), and two ends of the oil-conveying pipe (31) are connected with the oil inlets (29) and the oil outlet (30) respectively.

8. The self-protecting steering shaft for vehicle of claim 1, wherein: one side, far away from the first rotating shaft (1), of the second rotating shaft (2) is provided with an inserting groove (32), an inner gear ring (33) used for clamping a steering wheel is arranged in the inserting groove (32), and a dislocation buffer mechanism (34) is arranged in the inserting groove (32) on one side, close to the first rotating shaft (1), of the inner gear ring (33).

9. The self-protecting steering shaft for vehicle of claim 8, wherein: dislocation buffer gear (34) include along second pivot (2) to first pivot (1) direction set gradually, reversible buffer subassembly (35) and irreversible buffer subassembly (36), reversible buffer subassembly (35) are including fixing butt joint piece (39) on inserting groove (32) inner wall, be provided with buffer spring (41) between butt joint piece (39) and interior ring gear (33), be provided with fracture groove (40) on butt joint piece (39).

10. The self-protecting steering shaft for vehicle of claim 9, wherein: a buffer tube (42) is arranged between the abutting block (39) and the bottom wall of the inserting groove (32), the buffer tube (42) is a hollow thin-wall tube, and a plurality of rhombic holes (43) are formed in the side wall of the buffer tube (42).