阅读说明：本技术 动车组弹性胶泥缓冲装置 (Elastic daub buffering device for motor train unit ) 是由 刘永 王丽娟 丁洋 张博 陈时虎 陈磊 刘永超 于 2019-12-04 设计创作，主要内容包括：本发明公开了一种动车组弹性胶泥缓冲装置,包括拉头、拉头座、顶板、内活塞杆组件、外活塞杆组件、缸体、缸盖组件、拉套组件、后拉环、外缸筒组件。本发明通过采用内外双活塞杆结构、两级动静阻尼比、平键+平面两级防转机构、分体式定位环、第一和第二密封件双密封结构并在静动状态下交替使用等特征,具有性能稳定、密封可靠、低温性能好、吸收率高、寿命长、制造成本低等优点。(The invention discloses an elastic daub buffering device for a motor train unit, which comprises a pull head, a pull head seat, a top plate, an inner piston rod assembly, an outer piston rod assembly, a cylinder body, a cylinder cover assembly, a pull sleeve assembly, a rear pull ring and an outer cylinder assembly.)

1. The elastic daub buffering device for the motor train unit is characterized by comprising a pull head, a pull head seat, a top plate, an inner piston rod assembly, an outer piston rod assembly, a cylinder body, a cylinder cover assembly, a pull sleeve assembly, a rear pull ring and an outer cylinder barrel assembly, wherein the cylinder cover assembly comprises a cylinder cover and a th sealing element, the cylinder cover is in threaded connection with the cylinder body, elastic daub materials are filled in the cylinder body in a pressure filling mode, the outer piston rod assembly comprises an outer piston rod, the outer piston rod penetrates through the cylinder cover, the outer piston rod and the cylinder cover are sealed through a th sealing element, an inner piston rod mounting hole and an inner piston mounting hole are formed in the center of the outer piston rod, a plurality of one-way throttle valves and damping hole structures are arranged at the large end of the outer piston rod, the inner piston rod assembly comprises an inner piston rod and an inner piston in threaded connection with the end of the inner piston rod, the inner piston rod penetrates through the inner piston mounting hole, a second sealing element is arranged between the inner piston rod and the outer piston rod, a plurality of one-way throttle valves and damping hole structures are arranged at the large end of the inner piston rod, the.

2. The elastic daub buffer device of the motor train unit according to claim 1, characterized in that: the puller is in threaded connection with the puller seat, the puller seat is axially matched with the pull sleeve assembly through a conical surface, and the included angle between the conical surface and the axis is 60-70 degrees; the pull head, the pull head seat and the pull sleeve assembly are in clearance sliding fit, and a guide belt is arranged between the sliding fit surfaces.

3. The elastic daub buffer device of the motor train unit according to claim 1, characterized in that: the top plate is arranged between the pull head seat and the inner and outer piston rods, and is provided with a boss, a positioning surface and an arc surface; the lug boss is in contact fit with the bottom surface of the pull head seat and transmits impact force, and the positioning surface is in contact fit with the positioning ring and transmits traction force.

4. The elastic daub buffer device of the motor train unit according to claim 1, characterized in that: the length of the extending end of the inner piston rod is 16mm longer than that of the extending end of the outer piston rod, the inner piston rod is displaced under the condition of low-speed impact force, and the outer piston rod is displaced under the condition of high-speed impact force; the dynamic-static ratio of the inner piston rod component is larger than that of the outer piston rod component.

5. The elastic daub buffer device for the motor train unit according to claim 1 is characterized in that the pull sleeve assembly is arranged on the outer side of the end of the cylinder body and in threaded connection with the cylinder body, the outer cylinder barrel is arranged on the outer sides of the pull sleeve assembly and the cylinder body, and the pull sleeve assembly, the cylinder body and the outer cylinder barrel are in clearance sliding fit.

6. The elastic daub buffer device of the motor train unit according to claim 1, characterized in that: the rear pull ring is connected with the cylinder barrel through threads, and the rear pull ring is in contact with the bottom surface of the cylinder body.

7. The elastic daub buffer device of the motor train unit according to claim 1, characterized in that: the outer cylinder barrel and the positioning ring are in interference fit, and the bottom of the fitting surface is in arc transition.

8. The elastic daub buffer device of the motor train unit according to claim 1, characterized in that: a guide flat key is arranged between the pull sleeve component and the outer cylinder barrel and is in clearance sliding fit in the guide groove; the pull sleeve assembly is also provided with an anti-rotation block, the anti-rotation block and the pull sleeve are positioned by two positioning pins, and the anti-rotation block covers a guide groove of the guide flat key; the rotation preventing block and the pull head are in plane sliding clearance fit.

9. The elastic daub buffer device for the motor train unit according to claim 1 is characterized in that the cylinder cover assembly further comprises a dust ring, a guide belt, an elastic retainer ring, a sealing ring and a glue pouring hole, wherein the th sealing element is arranged between the dust ring and the guide ring, and an arc-shaped annular groove and a radial through groove are formed in the contact end of the guide ring and the th sealing element.

10. The elastic daub buffer device of the motor train unit according to claim 1, characterized in that: the number of the damping holes on the inner piston is 2, the depth of the damping holes is 3-5mm, the number of the one-way throttle valves is 8, and the diameter of the throttle valve is 4-8 mm; the number of the outer piston damping holes is 3, the depth of the damping holes is 3-5mm, the number of the one-way throttle valves is 9, and the diameter of the throttle valve is 4-8 mm.

Technical Field

The invention relates to a buffer device for a rail transit equipment coupler, in particular to an elastic daub buffer device for a concentrated power standard motor train unit locomotive and vehicle, and belongs to the technical field of rail transit equipment.

Background

The buffer device is used as which is an important part of railway equipment, and has the main functions of transmitting traction force, relieving impact force, reducing vibration, absorbing impact kinetic energy, reducing longitudinal impulse, improving the longitudinal dynamic performance of trains and the like.

In order to meet the development requirements of the speediness and the overloading of the freight transportation in China, the performance indexes of the buffer device also provide higher requirements, and the main performance indexes are as follows: initial pressure, volume, maximum static impedance, maximum dynamic impedance, stroke, energy absorption rate, and the like. In general, a superior performance cushioning device should have a relatively low initial pressure, a large capacity, a suitable static impedance, a low dynamic impedance, a high energy absorption rate, a long lifetime, and a low manufacturing cost.

The buffer can be classified into a liquid-gas buffer, an elastic cement buffer, an elastomer buffer, a rubber buffer, a spring friction type buffer and a combined buffer of the above types according to the buffer media.

At present, all core part buffers in a hook buffer device of a standard motor train unit are imported into British OLEO liquid-gas buffers. Although localization of other passenger vehicle type buffer devices is realized, most buffer devices have the problems of poor performance stability, low sealing reliability, overhigh initial impedance, overlarge internal pressure, poor low-temperature resilience, high manufacturing cost and the like.

The product disclosed by the invention is systematically and deeply researched and analyzed from the aspects of sealing reliability, low-temperature performance, performance stability, manufacturability, maintainability, noise reduction, fatigue life and the like, and is invented by combining research and analysis results.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide elastic daub buffer devices for a motor train unit, which have the advantages of stable performance, high sensitivity, reliable sealing, large capacity, high absorptivity, good low-temperature performance, long service life and low manufacturing cost.

The elastic daub buffering device comprises a pull head, a pull head seat, a top plate, an inner piston rod assembly, an outer piston rod assembly, a cylinder body, a cylinder cover assembly, a pull sleeve assembly, a rear pull ring and an outer cylinder barrel assembly, wherein the cylinder cover assembly comprises a cylinder cover and a -th sealing element, the cylinder cover is in threaded connection with the cylinder body, elastic daub materials are filled in the cylinder body in a pressure mode, the outer piston rod assembly comprises an outer piston rod, the outer piston rod penetrates through the cylinder cover, the outer piston rod and the cylinder cover are sealed through a -th sealing element, an inner piston rod mounting hole and an inner piston mounting hole are formed in the center of the outer piston rod, a plurality of one-way throttle valves and damping hole structures are arranged at the large end of the outer piston rod, the inner piston rod is connected with the end of the inner piston rod through threads, the inner piston rod penetrates through the inner piston mounting hole, a second sealing element is arranged between the inner piston rod and the outer piston rod, a plurality of one-way throttle valves and damping hole structures are arranged at the large end of the inner piston rod, the outer piston rod.

, the pull head is in threaded connection with the pull head seat, the pull head seat is in axial fit with the pull sleeve assembly through a conical surface, the included angle between the conical surface and the axis is 60-70 degrees, the pull head seat and the pull sleeve assembly are in clearance sliding fit, and a guide belt is arranged between the sliding fit surfaces.

, arranging the top plate between the pull head seat and the inner and outer piston rods, arranging a boss, a positioning surface and an arc surface on the top plate, contacting and matching the boss with the bottom surface of the pull head seat and transmitting impact force, and contacting and matching the positioning surface with the positioning ring and transmitting traction force.

, the length of the extending end of the inner piston rod is 16mm longer than that of the extending end of the outer piston rod, the inner piston rod is displaced under the condition of low-speed impact force, the outer piston rod is displaced under the condition of high-speed impact force, and the dynamic-static ratio of the inner piston rod assembly is greater than that of the outer piston rod assembly.

, the pulling sleeve component is arranged on the outer side of the end of the cylinder and is in threaded connection with the cylinder, the outer cylinder is arranged on the outer sides of the pulling sleeve component and the cylinder, and the pulling sleeve component, the cylinder and the outer cylinder are in clearance sliding fit.

And , connecting the rear pull ring with the cylinder barrel through threads, and contacting the rear pull ring with the bottom surface of the cylinder barrel.

, the outer cylinder barrel and the positioning ring are in interference fit, and the bottom of the matching surface is in arc transition.

, arranging a guide flat key between the pull sleeve component and the outer cylinder barrel, wherein the guide flat key is in clearance sliding fit in the guide groove, arranging an anti-rotation block on the pull sleeve component, positioning the anti-rotation block and the pull sleeve through two positioning pins, covering the guide groove of the guide flat key with the anti-rotation block, and the anti-rotation block and the pull head are in plane sliding clearance fit.

, the cylinder cover assembly further comprises a dust ring, a guide belt, an elastic retainer ring, a sealing ring and a glue pouring hole, wherein the th sealing element is arranged between the dust ring and the guide ring, and an arc-shaped annular groove and a radial through flow groove are formed in the contact end of the guide ring and the th sealing element.

steps further, the number of the damping holes on the inner piston is 2, the depth of the damping holes is 3-5mm, the number of the one-way throttle valves is 8, the diameter of the throttle valves is 4-8mm, the number of the damping holes on the outer piston is 3, the depth of the damping holes is 3-5mm, the number of the one-way throttle valves is 9, and the diameter of the throttle valves is 4-8 mm.

The invention adopts the characteristics of an internal and external double-piston rod structure, a two-stage dynamic and static damping ratio, a flat key and plane two-stage anti-rotation mechanism, a split type positioning ring, a and a second sealing element double-sealing structure, and the like, and is alternately used in a static and dynamic state, innovations are realized on the structure and principle, the tension and compression bidirectional buffering function is realized, the problems of unstable performance, low-temperature non-resetting, sealing leakage, overlarge initial impedance force and the like of the existing product are solved, the performance requirements of railway vehicles are better met, a foundation is laid for the rapid development of the railway industry, and the invention has the advantages of stable performance, reliable sealing, good low-temperature performance, high absorption rate, long service life, low manufacturing cost and the like.

Drawings

FIG. 1 is a schematic structural view of an elastic daub buffer device of a motor train unit.

Fig. 2 is a left side view of the outer piston rod assembly.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a left side view of the inner piston rod assembly.

Fig. 5 is a sectional view B-B of fig. 4.

FIG. 6 is a cross-sectional view of the cylinder head assembly.

Fig. 7 is a cross-sectional view of a pull sleeve assembly.

Fig. 8 is a top left view.

Fig. 9 is a left side view of the anti-rotation block.

The drawing marks include 1-a puller, 101-a plane, 2-a puller seat, 201-a matching surface, 202-a shaft shoulder, 203-a matching surface, 3-an outer cylinder barrel assembly, 31-a positioning ring, 311-a matching surface, 312-a matching surface, 32-a positioning block, 33-a mounting screw, 34-an outer cylinder barrel, 4-a guide belt, 5-a top plate, 51-an arc surface, 52-an arc surface, 53-a boss, 54-a sliding plane, 55-a positioning surface, 56-a positioning surface, 6-an inner piston rod assembly, 61-a guide belt mounting groove, 62-an inner piston rod, 621-a matching surface, 622-a positioning surface, 63-a second sealing element, 64-a guide belt mounting groove, 65-a damping hole through hole, 651-a stepped hole, 66-an inner piston, 67-a one-way throttle valve, 671-a positioning plug, 672-a steel ball 7-an outer piston rod assembly, 71-an outer piston rod assembly, 72-a guide belt mounting groove, 73-a stepped hole, 74-an inner piston mounting hole, 75-a positioning plug, 75-a locating screw hole, 83-a straight groove, 752-a pin hole, 752-76-an inner piston rod assembly, 76-an inner ball guide belt mounting groove, a cylinder head assembly.

Detailed Description

The structure of the present invention is further illustrated in the following description in conjunction with the drawings.

Referring to fig. 1, the invention comprises a puller 1 coaxially arranged at , a puller seat 2, a top plate 5, a pull sleeve assembly 9, an inner piston rod assembly 6, an outer piston rod assembly 7, a cylinder cover assembly 8, a cylinder body 10, an anti-rotation block 13, an outer cylinder barrel assembly 3, a rear pull ring 12 in threaded connection with the outer cylinder barrel 34, and an elastic daub material 11 filled in the cylinder body 10 under pressure, wherein the outer cylinder barrel assembly 3 comprises an outer cylinder barrel 34, a positioning ring 31, a positioning block 32 and a mounting screw 33, the positioning block 32 is of a hollow structure and is connected with the outer cylinder barrel 34 by two screws 33, and the screw thread is coated with a thread fastening glue for preventing looseness.

Referring to fig. 2 and 3, the outer piston rod assembly 7 comprises an outer piston rod 71, a positioning plug 75 and a steel ball 76, the positioning plug 75 is mounted on the outer piston rod 71 through threads, referring to fig. 4 and 5, the inner piston rod assembly 6 comprises an inner piston rod 62, a second sealing member 63, an inner piston 66 connected on the inner piston rod 62 through threads, a positioning plug 671 and a steel ball 672, the inner piston 66 is mounted on the inner piston rod 66 through threads, referring to fig. 7, the pull sleeve assembly 9 comprises a guide belt 91, a locking screw 92 and a guide flat key 93, referring to fig. 6, the cylinder cover assembly 8 comprises a cylinder cover 82, a positioning plug 81, a steel ball 83, a steel ball 84, a sealing member 85, a positioning plug 86, an elastic retainer 87, a guide ring 88, a guide belt 881, a -th sealing member 89 and a dust ring 90, wherein the positioning plug 81, the steel ball 83, the steel ball 84 and the positioning plug 86 are located on the same axis , the sealing ring 85, the elastic retainer 87, the guide ring 88, the , the dust ring 89 and the guide belt.

Referring to fig. 1, the pull sleeve 9 is connected with the cylinder body 10 by a thread 1002, and the axial positioning is realized by a positioning surface 1001. The cylinder block 10 and the outer cylinder 34 are radially positioned by the guide belt 1003 and function to reduce the occurrence of axial moving wear between the cylinder block 10 and the outer cylinder 34. The mating surface 122 of the rear tab 12 with the cylinder body 10 is provided with an inner recessed land 121 for improving the workability and reducing the impact sound of the mating surface 122. The interference fit of the outer cylinder barrel 34 and the positioning ring 31 is realized through the matching surface 311, the matching surface 312 of the positioning ring 31 is contacted with the top plate 5 and pulls the transmission force, the matching surface 312 is easy to wear under the action of the pulling force, after the split positioning ring structure is adopted, only the positioning ring 31 needs to be replaced when the matching surface 312 is worn during maintenance, in addition, the high-strength alloy steel material is only needed to be replaced for the positioning ring 31 in order to reduce the wear of the matching surface 312, and the outer cylinder barrel 34 does not need to select the high-strength alloy steel material, so the manufacturing cost and the maintenance cost. The slider 1 and the slider seat 2 are coaxially connected through threads, and radial positioning is realized through a shaft shoulder 202 to ensure that the two pieces are coaxial. The head base 2 contacts the top plate 5 through the mating surface 203 and transmits the impact force.

Referring to fig. 2 and 3, nine one-way throttle valves 78 are installed on an outer piston rod 71, three damping holes 79 are formed, a guide belt installation groove 72 is formed, an inner piston rod installation hole 77 is formed, and an inner piston installation hole 74 is formed, wherein the one-way throttle valves 78 are composed of a positioning plug 75 and steel balls 76, the positioning plug 75 is assembled with the outer piston rod 71 through threads , a -shaped groove 751 is formed in the positioning plug 75 for installation convenience, and a through hole 752 is formed for through-flow of fluid, wherein after the guide belt is installed in the guide belt installation groove 72, radial positioning of the outer piston rod is achieved, isolation and sealing of a working cavity and a non-working cavity is achieved, a stepped hole 73 is formed in the damping hole 79, the stepped hole 73 does not have a damping characteristic due to a large diameter, the structure can effectively reduce the influence of damping characteristic changes due to viscosity changes of elastic cement materials under high and low temperature conditions, the damping characteristic changes of damping characteristics are reduced, stability of self-moving performance of products is improved, when external force applied to external force of the external piston rod 7 is applied to the cylinder 10, the external force is reduced, the elastic cement materials are reduced, the elastic cement materials flow of the elastic cement materials, the damping characteristics of the damping material flow of the damping material, the damping material is reduced by the damping material, the damping material is reduced by the damping hole, the damping material is reduced by the damping material, the damping hole, the damping material is reduced by the damping material, the damping hole, the damping material is reduced by the damping material, the damping material is reduced by reducing the damping material, the damping material is reduced the damping material, the damping material is reduced the damping material, the damping material is.

Referring to fig. 4 and 5, the inner piston rod 62 is provided with a second sealing member 63 and an inner piston 66, and is provided with a guide belt mounting groove 61, the inner piston 66 is provided with eight one-way throttle valves 67, two damping holes 65 are provided, and a guide belt mounting groove 64 is provided, wherein the inner piston rod 62 is coaxially mounted with the inner piston 66 and is in threaded connection, axial positioning of the two members is achieved through a positioning surface 622, and radial positioning of the two members is achieved through a mating surface 621, wherein a stepped hole 651 on the damping hole 65 is in cooperation with a stepped hole 73 on the outer piston rod, wherein the one-way throttle valve 67 is composed of a positioning plug 671 and steel balls 672, and has the same working principle as the one-way throttle valve 78, wherein the guide belt mounting groove 61 is in cooperation with an inner piston rod mounting hole 77 after the guide belt is mounted in the guide belt mounting groove 61, the guide belt mounting groove 64 is in cooperation with an inner piston mounting hole 74 after the guide belt is mounted in the guide belt mounting groove 64, the diameter of the inner piston rod 62 is much smaller than the diameter of the outer piston rod 71, so that the diameter of the inner piston rod 71 is smaller than the diameter of the outer piston rod 71, the piston rod 62, the arrangement enables the inventive product to enable the inventive product to achieve higher filling pressure of the cylinder 10 under the same initial pressure adjustment under the same initial pressure, the initial pressure is greatly improved, the initial pressure is greatly improved, the initial pressure of the initial pressure adjustment, the initial pressure adjustment, the initial pressure is greatly improved, the initial pressure of the initial pressure adjustment, the piston rod sealing member is greatly improved, the lower than the initial pressure of the initial pressure adjustment, the piston rod sealing member is improved, the initial pressure recovery rate of the piston rod assembly, the piston rod assembly is improved.

Referring to fig. 6, a dust ring 90 mounted on a cylinder head 82 is used for preventing dust or foreign matters from entering an inner cavity of a cylinder body 10 and also playing a role of protecting a -st sealing element 89, a -th sealing element 89 mounted on the cylinder head 82 plays a role of sealing a high-pressure elastic cement material 11, a -th sealing element 89 is arranged behind a guide ring 88 to play a role of relieving impact pressure so as to achieve the purpose of improving sealing reliability, a guide belt 881 is mounted on the guide ring 88 to play a role of radially positioning an outer piston rod 71, an annular groove and a flow through groove are arranged at a contact end of the guide ring 88 and a -th sealing element 89 so as to provide reasonable axial pressure for the -th sealing element 89, a sealing lip of the -th sealing element 89 has a reasonable adhesion force on a piston rod surface so as to avoid a problem of leakage of the sealing element, an elastic retainer ring 87 mounted on the cylinder head 82 plays a role of axially positioning the guide ring 88 so as to achieve the purpose of improving sealing reliability of sealing the sealing between the cylinder head 82 and the cylinder body 10 by reducing the sealing pressure of the sealing element 82 and the filling the sealing material 83, and the sealing element 83, and the sealing element 83, after the sealing element 83, and the sealing element 83.

Referring to fig. 7, the pull sleeve assembly 9 is provided with a guide belt 91, a locking screw 92, a guide flat key 93, a mounting thread 95 for the cylinder 10, an inclined plane 94 for matching with a matching surface 201 on the pull head seat 2, a top plate 5 mounting hole 96, mounting grooves 98 and 99 for an anti-rotation block 13, and a screw hole 97 fixedly connected through a screw 14, the anti-rotation screw 92 is arranged to effectively prevent the loosening of the thread 95, the guide belt 91 is arranged to prevent the pull sleeve 9, the pull head seat 2 and the pull head 1 from moving and wearing, so as to improve the structural service life, the top plate mounting hole 96 is arranged to enable the top plate 5 to penetrate through the inner cavity of the pull sleeve 9, and enable the plane thereof to be vertically mounted with the center line of the pull sleeve 9, the inclined plane 94 is in contact with the matching surface 201 and transmits traction force, the included angle between the inclined plane 94 and the pull sleeve is 60-70 °, the arrangement of the angle can effectively reduce the root stress concentration, and improve the structural reliability, and the arrangement of the guide flat key 93 can effectively prevent the rotation displacement between the pull sleeve 9 and the outer cylinder 34, thereby ensuring.

Referring to fig. 8, the top plate 5 is provided with a boss 53, circular arc surfaces 51 and 52, and a sliding plane 54. The boss 53 is provided so that the strength and rigidity of the top plate are greatly improved, thereby ensuring the structural reliability. The arrangement of the arc surface 51 enables the top plate 5 to fully utilize the internal space to improve the strength and rigidity of the top plate, thereby ensuring the reliability of the structure, and the arc surface is in clearance fit with the inner hole of the pull sleeve. The sliding plane 54 is arranged to allow the top plate 5 to move axially along the upper and lower planes of the top plate mounting hole 96 when the top plate is displaced axially, so as to perform a limiting function, and the fit is a clearance fit. The arc surface 52 is in clearance fit with the inner hole surface of the outer cylinder 34. The top plate 5 is in contact engagement with the face 312 of the retaining ring 31 via the retaining faces 55 and 56, i.e. traction is transmitted via the retaining faces 55 and 56 and the face 312.

Referring to fig. 9, the anti-rotation block 13 is provided with a screw hole 135, a positioning pin hole 134, a key slot matching platform 131 and an anti-rotation matching surface 136, a positioning pin is arranged in the positioning pin hole 134 in an interference manner, so that the anti-rotation block and the pull sleeve 9 keep a stable relative position relationship, the screw hole 135 is fastened on the pull sleeve 9 through a fastening screw 14 to play a role of preventing the anti-rotation block from loosening and falling, the key slot matching platform 131 can block a flat key slot on the outer cylinder 34 to play a role of preventing foreign matters from entering an inner cavity of the outer cylinder 34 and also play a role of attractive appearance, the anti-rotation matching surface 136 is matched with a plane 101 on the pull head 1, the matching is micro-clearance matching, so that the pull head 1 and the pull sleeve 9 do not generate circumferential rotation displacement, and the coupler is ensured to be.

The invention relates to an motor train unit elastic daub buffer device, which mainly converts impact kinetic energy into heat energy and potential energy through an elastic daub material to play a role in buffering, when a piston rod bears external force, the piston rod is pressed into a cylinder body to enable the elastic daub material to generate friction through a damping hole on the piston and enable the elastic daub material to generate molecular motion, molecular chain segments and molecular chain movement to consume the impact kinetic energy and convert the impact kinetic energy into the heat energy to dissipate the heat energy, when the external force is reduced or cancelled, the elastic daub material automatically expands in volume, the piston rod is subjected to outward acting force to rebound, and a one-way throttle valve on the piston is opened in the rebound process to adjust rebound resistance and rebound speed, and finally the piston rod is pushed back to the original position to prepare for next impacts.

The product of the invention has the functions of bidirectional pulling and buffering: traction cushioning and impact cushioning. When the vehicle is pulled by the buffer device, the transmission sequence of the forces is as follows: the pull head comprises a pull head 1, a pull head seat 2, a pull sleeve 9, a cylinder body 10, elastic daub materials 11, an inner piston rod 6/7, a top plate 5, a positioning ring 31, an outer cylinder barrel 34 and a rear pull ring 12. When the vehicle impacts through the buffer device, the force transmission sequence is as follows: the puller comprises a puller 1, a puller seat 2, a top plate 5, an inner piston rod 6/7, an elastic daub material 11, a cylinder 10 and a rear pull ring 12.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements can be made to the technical solution of the present invention without departing from the spirit of the present invention, which is defined by the claims of the present invention.