CN110439951B - Integrated semi-active suspension hydraulic actuator for emergency rescue vehicle - Google Patents
Integrated semi-active suspension hydraulic actuator for emergency rescue vehicle Download PDFInfo
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- CN110439951B CN110439951B CN201910749891.3A CN201910749891A CN110439951B CN 110439951 B CN110439951 B CN 110439951B CN 201910749891 A CN201910749891 A CN 201910749891A CN 110439951 B CN110439951 B CN 110439951B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/182—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein comprising a hollow piston rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3221—Constructional features of piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/366—Special sealings, including sealings or guides for piston-rods functioning as guide only, e.g. bushings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/369—Sealings for elements other than pistons or piston rods, e.g. valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
- F16F9/49—Stops limiting fluid passage, e.g. hydraulic stops or elastomeric elements inside the cylinder which contribute to changes in fluid damping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/0023—Purpose; Design features protective
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses an integrated semi-active suspension hydraulic actuator for an emergency rescue vehicle. The buffer structure comprises a first buffer groove, a first buffer cavity, a second buffer groove and a second buffer cavity, when the stroke of the piston rod of the suspension actuator exceeds the limit, oil in the buffer cavity is extruded out of the buffer groove, so that the piston rod is decelerated continuously until the piston rod stops in the motion process, and the internal elements of the actuator are prevented from being impacted; the plug-in type proportional throttle valve is integrated at the top end part of a piston rod of the semi-active suspension actuator, the opening of the main valve core can be controlled through the proportional pilot valve, the flow area between the first pore channel and the second pore channel is further continuously adjusted, continuous adjustment of semi-active suspension damping is achieved, and compared with a traditional mode of adopting hydraulic pipeline connection, the plug-in type proportional throttle valve is compact in structure, high in integration level and easy to install.
Description
Technical Field
The invention relates to a vehicle suspension actuator, in particular to an integrated semi-active suspension hydraulic actuator for an emergency rescue vehicle.
Background
Suspensions are an important component of automobiles. The semi-active suspension can adjust the suspension rigidity or damping in time according to the current running and road conditions of the vehicle, so that the suspension system is in a good vibration damping state, and the running smoothness and safety of the vehicle are ensured. The hydraulic actuator is a key part of the semi-active suspension, and the performance of the suspension actuator is determined by the structure of the suspension actuator, and the structure directly influences a semi-active suspension system, so that the driving smoothness and safety of a vehicle are influenced. The emergency rescue vehicle has large carrying capacity, complex running road surface and serious impact and jolt, and the vibration amplitude of the suspension actuator often exceeds the stroke of the suspension actuator in the running process, so that the actuator is damaged.
Most of the existing semi-active suspension actuators are magnetorheological fluid type actuators, the damping output range is wide, and the output response is fast, for example, the Chinese patent name is 'a magnetorheological fluid damper' (the application number is 201610724316.4). However, the magnetorheological fluid type actuator has the problems of high cost, difficult coil heat dissipation, energy waste and the like.
The existing semi-active suspension hydraulic actuator is complex in structure, large in size, not easy to install and free of limiting buffer devices, and when the stroke of a piston rod of the suspension actuator exceeds the limit, internal elements of the actuator are impacted.
Disclosure of Invention
The invention aims to provide a semi-active suspension actuator which is suitable for emergency rescue vehicles and has high integration level and a limiting and buffering function. Through set up two cushion chambers in the cylinder, make suspension actuator piston rod stroke when surpassing, actuator inner element avoids receiving great impact force. The invention also aims to integrate the plug-in proportional throttle valve into a semi-active suspension actuator, thereby realizing the continuous stepless regulation of suspension damping.
In order to achieve the above object, the present invention provides an integrated semi-active suspension actuator for an emergency rescue vehicle, comprising: the cylinder barrel comprises a bottom end and an opening end opposite to the bottom end in the diameter direction; the first guide sleeve is arranged at the opening end of the cylinder barrel; the guide rod comprises a fixed end and a free end opposite to the fixed end in the diameter direction, and the fixed end is fixedly connected with the cylinder cover; the second guide sleeve is arranged at the free end of the guide rod; a piston rod which is arranged between the cylinder and the guide rod, can perform reciprocating telescopic motion between the first guide sleeve and the second guide sleeve, and comprises a base end part and a top end part opposite to the base end part in the diameter direction; a piston provided at a base end portion of the piston rod; the cylinder cover is arranged at the bottom end of the cylinder barrel; the plug-in type proportional throttle valve is arranged at the top end part of the piston rod, and the opening of the valve core can be continuously adjusted; a connecting block disposed at a top end portion of the piston rod, wherein the piston rod is provided with a groove on a bottom surface of the top end thereof facing the free end of the guide rod, and a protruding portion of the guide rod protruding from the second guide sleeve is insertable into the groove, wherein the groove constitutes a first buffer chamber; the base end part of the piston rod is provided with an annular stepped boss, the first guide sleeve is provided with the annular boss and a concave part which is formed by the inner wall of the annular boss and can accommodate the annular stepped boss, the outer diameter of the annular stepped boss is equal to the inner diameter of the concave part, and a space enclosed between the inner wall of the cylinder barrel and the outer wall of the annular stepped boss forms a second buffer cavity; when the upward movement amplitude of the piston rod exceeds the working stroke of the piston rod, the annular boss of the first guide sleeve enters the second buffer cavity, oil in the second buffer cavity is extruded out, and the piston rod is prevented from colliding with the first guide sleeve; when the downward movement amplitude of the piston rod exceeds the working stroke of the piston rod, the extending part of the guide rod enters the first buffer cavity, oil in the first buffer cavity is extruded out, and the piston rod is prevented from colliding with the guide rod
Furthermore, a plurality of second buffer grooves are uniformly distributed in the annular boss, the second buffer grooves are matched with the second buffer cavities, and when the piston works normally, the annular boss is positioned outside the second buffer cavities; the extension of guide bar sets up two first dashpots on becoming 180 degrees angle directions, with the help of first dashpot, enables first cushion chamber cooperates the joint with the extension of guide bar, just during piston normal operating, the extension is located outside the first cushion chamber.
Further, the plug-in type proportional throttle valve is arranged at the top end part of the piston rod, the opening degree of the main valve core is controlled through the proportional pilot valve of the proportional throttle valve, and then the flow area between a first pore passage and a second pore passage is continuously adjusted to realize stepless adjustment, wherein the first pore passage is arranged in the top end part of the piston rod along the axis of the piston rod in parallel, and the second pore passage is arranged in the top end part of the piston rod along the axis of the plug-in type proportional throttle valve in an extending manner.
Furthermore, the plug-in type proportional throttle valve comprises a main valve core, a bushing, a valve sleeve, a cover plate, a pilot piston rod, a pilot valve end cover and a proportional valve, wherein the main valve core is arranged in a cavity of the bushing and can reciprocate in the bushing along the axial direction; the valve sleeve is arranged between the bushing and the cover plate, the fit mode of the valve sleeve and the bushing is interference fit, and the valve sleeve is fixed with the cover plate by adopting threaded connection; the cover plate is arranged on the top end plane structure of the piston rod, the top of the cover plate is sealed through a pilot valve end cover, and a proportional valve is arranged on the side face of the cover plate; the pilot piston rod is arranged on the axes of the valve sleeve and the cover plate and can reciprocate along the axis direction.
Furthermore, a first actuating cavity is formed between the piston rod and the second guide sleeve, the piston rod extends into the middle part of the cylinder barrel and forms a second actuating cavity with the inner wall of the cylinder barrel, and an area enclosed by the cylinder cover and the piston between the cylinder barrel and the guide rod is a third actuating cavity; the top end portion of the piston rod is provided with a first pipe joint hole and a second pipe joint hole, the first pipe joint hole is connected with the second actuating cavity through a first pore channel, a second pore channel and a third pore channel, and the second pipe joint hole is connected with the first actuating cavity through a fourth pore channel.
Further, the diameters of the first pore passage, the second pore passage, the third pore passage and the fourth pore passage are set to be 12 mm; the central line of the first pipe joint hole and the central line of the second pipe joint hole are arranged at an angle of 90 degrees.
Compared with the prior art, the invention has the following advantages:
1. the invention integrates the plug-in type proportional throttle valve on the semi-active suspension actuator to realize the continuous adjustment of the suspension damping, and compared with the traditional mode of adopting hydraulic pipeline connection, the invention has the advantages of compact structure, small pressure loss and easy installation.
2. The semi-active suspension actuator provided by the invention is provided with the buffer structure, the buffer structure does not influence the normal work of the semi-active suspension actuator, and when the stroke of the piston rod of the suspension actuator exceeds the limit, the buffer structure plays a role, so that the damage of the internal element of the actuator caused by impact is avoided.
3. The semi-active suspension actuator provided by the invention forms 3 actuating cavities under the condition of not increasing the number of elements, and compared with the traditional two-cavity actuator, the semi-active suspension actuator increases the possibility of realizing different connection modes.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a cross-sectional view of an integrated semi-active suspension actuator for an emergency rescue vehicle according to the present invention;
FIG. 2 is a schematic view of the integrated semi-active suspension actuator of the present invention taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of the integrated semi-active suspension actuator of the present invention taken along line B-B of FIG. 1; and
FIG. 4 is a schematic view of the integrated semi-active suspension actuator of the present invention taken along line C-C of FIG. 1;
in the figure: 1. the hydraulic control valve comprises a cylinder barrel, 2, a first guide sleeve, 3, a guide rod, 4, a second guide sleeve, 5, a piston rod, 6, a piston, 7, a cylinder cover, 8, a first buffer cavity, 9, a first buffer groove, 10, a second buffer groove, 11, a second buffer cavity, 12, a plug-in type proportional throttle valve, 121, a main valve core, 122, a lining, 123, a valve sleeve, 124, a cover plate, 125, a pilot piston rod, 126, a pilot valve end cover, 127, a proportional valve, 13, a connecting block, 14, a first pipe joint hole, 15, a first hole channel, 16, a second hole channel, 17, a third hole channel, 18, a second pipe joint hole, 19 and a fourth hole channel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, an integrated hydraulic actuator according to a preferred embodiment of the present invention is applied to a semi-active suspension of a heavy-duty engineering vehicle or an emergency rescue vehicle.
The actuator comprises a cylinder barrel 1, a first guide sleeve 2, a guide rod 3, a second guide sleeve 4, a piston rod 5, a piston 6, a cylinder cover 7, a plug-in type proportional throttle valve 12 and a connecting block 13.
The cylinder barrel 1 is cylindrical and comprises a bottom end and an opening end opposite to the bottom end along the axial direction, and the axis of the cylinder barrel 1 is indicated by OO lines as shown in figure 1. The first guide bush 2 is arranged at the open end of the cylinder 1. The first guide sleeve 2 is provided with an annular boss 52 and a concave part 54 which is formed by the inner wall of the annular boss 52 and can accommodate the annular stepped boss 51, the outer diameter of the annular stepped boss 51 is equal to the inner diameter of the concave part 54, and a space enclosed between the inner wall of the cylinder barrel and the outer wall of the annular stepped boss 51 forms a second buffer cavity 11; the annular bosses 52 are uniformly distributed with a plurality of, preferably four second buffer grooves 10, the second buffer grooves 10 are matched with the second buffer cavities 11, and the axial matching length is not within the stroke length of the active suspension actuator, that is, when the active suspension actuator works normally, the annular bosses 52 do not enter the second buffer cavities 11. In terms of installation, the first guide sleeve 2 is fixed to the cylinder tube 1 by means of a screw connection.
The guide rod 3 includes a fixed end and a free end disposed opposite to the fixed end in the axial direction. The free end to 8 directions of first cushion chamber extend there is boss 53, and boss 53 is 180 degrees angles and sets up two first dashpots 9, with the cooperation of first cushion chamber 8, and axial cooperation length is not in within the initiative suspension actuator stroke length, when the initiative suspension actuator normally worked promptly, the boss did not get into in the first cushion chamber 8. The fixed end of the guide rod 3 is fixed on the cylinder cover 7 in a bolt connection mode. The second guide sleeve 4 is fixed to the free end of the guide rod 3 by means of a screw connection.
The piston rod 5 comprises a base end part and a top end part which is opposite to the base end part along the diameter direction, a groove 8 is arranged on the bottom surface of the top end of the piston rod 5 facing the free end of the guide rod 3, and the groove 8 forms a first buffer cavity and is matched with the extending part 53 of the free end of the guide rod 3; the base end part of the piston rod 5 is provided with an annular stepped boss 51 which is matched with an annular boss 52 of the first guide sleeve 2; the top end portion of the piston rod 5 is provided with a first pipe joint hole 14 and a second pipe joint hole 18, the first pipe joint hole 14 is connected with the second actuating cavity through a first hole passage 15, a second hole passage 16 and a third hole passage 17, and the second pipe joint hole 18 is connected with the first actuating cavity through a fourth hole passage 19. In a preferred embodiment, the first port channel 15, the second port channel 16, the third port channel 17 and the fourth port channel 19 are all arranged with a diameter of 12mm, which has the advantage that: the flow requirement of the actuator required when the actuator moves at high frequency is met. The piston rod 5 extends into the space between the cylinder barrel 1 and the guide rod 3 and can do reciprocating telescopic motion between the first guide sleeve 2 and the second guide sleeve 4. The piston 6 has an annular structure, and the piston 6 is fixed to the base end portion of the piston rod 5 by a bolt. The cylinder cap 7 sets up in the bottom of cylinder 1 in order to be sealed with the bottom, and the cylinder cap 7 sets up in the bottom of cylinder 1 through the welded mode, and is fixed with guide bar 3 through bolted connection's mode. The connecting block 13 is arranged at the top end of the piston rod 5 in a welding mode.
The cartridge type proportional throttle valve 12 includes a main spool 121, a bush 122, a valve sleeve 123, a cover plate 124, a pilot piston rod 125, a pilot end cover 126, and a proportional valve 127. The main spool 121 is disposed in a cavity of the bush 122 to be reciprocable in the bush 122 in the axial direction; the valve sleeve 123 is arranged between the bushing 122 and the cover plate 124, the matching mode of the valve sleeve 123 and the bushing 122 is interference fit, and the valve sleeve 123 and the bushing 122 are fixed with the cover plate 124 by adopting threaded connection; the cover plate 124 is arranged on the d-end plane structure of the piston rod 5, the top of the cover plate 124 is sealed by a pilot valve end cover 126, and the side surface of the cover plate is provided with a proportional valve 127; the pilot piston rod 125 is disposed on the axis of the valve housing 123 and the cover plate 124, and is reciprocated in the axial direction.
The proportional valve 127 drives the main valve element 121 by controlling the movement of the pilot piston rod 125, and can control the main valve element 121 at any position; the top and bottom stress areas of the main valve element 121 along the axial direction are set to be the same, so that the pilot piston rod 125 drives the main valve element to move only by overcoming the friction force and the hydraulic force; a sealing ring is arranged between the bushing 122 and the valve sleeve 123 to ensure sealing; sealing rings are arranged between the valve sleeve 123 and the piston rod 5 and between the valve sleeve 123 and the cover plate 124 to ensure sealing; the pilot piston rod 125 is fixed to the main valve element 121 through a threaded connection, and a gap is sealed between the pilot piston rod and the valve sleeve to ensure that no pressure cross is generated.
Fig. 2 shows a detailed structural diagram of the port of the present invention and the top end portion of the piston rod 5. As shown in fig. 2, the plug-in proportional throttle valve 12 is provided at the tip end portion of the piston rod 5, the opening degree of the main spool 121 is controlled by the proportional pilot valve of the proportional throttle valve, and the flow area between the first port passage 15 provided in the tip end portion of the piston rod 5 in parallel with the axis of the piston rod 5 and the second port passage 16 provided in the tip end portion of the piston rod 5 in extension along the axis of the plug-in proportional throttle valve 12 is continuously adjusted to achieve stepless adjustment. The top end of the piston rod 5 is provided with a planar structure installation plug-in type proportional throttle valve.
The characteristics of the plug-in proportional throttle valve are specifically analyzed through simulation, the structure is optimized as follows, the drift diameter of the main valve element 121 is set to be 16mm so as to meet the flow requirement of an actuator; the chamfer at the bottom of the main spool 121 is set to 60 degrees to enhance sealing; the piston size of the pilot piston rod 125 is set to 8mm to overcome the friction and hydrodynamic force borne by the main valve element 121; the rod diameter of the control rod 125 is set to 4mm by strength check to ensure the rod strength.
A first actuating cavity I is formed between the piston rod 5 and the second guide sleeve 2, the piston rod 5 extends into the middle part of the cylinder barrel 1 and forms a second actuating cavity II with the inner wall of the cylinder barrel 1, and an area enclosed by the cylinder cover 7 and the piston 6 between the cylinder barrel 1 and the guide rod 3 is a third actuating cavity III; the first actuating cavity I and the second actuating cavity II can be interconnected with other actuators to form a whole vehicle semi-active suspension system; the third actuation chamber III may be connected to the atmosphere.
Fig. 3 illustrates the detailed structure and arrangement of two first buffer slots 9 of the present invention, and as shown in fig. 3, the cross section of the first buffer slot 9 is a sector, and the sector angle is set to be 60 degrees. Two first dashpots 9 are 180 degrees angle settings and are in the free end boss of guide bar 3.
Fig. 4 illustrates a detailed structure and arrangement of four second buffer slots 10 according to the present invention, and as shown in fig. 4, the cross section of the second buffer slot 10 is a sector, and the sector angle is set to 60 degrees. The four second buffer grooves 10 are uniformly distributed on the annular boss of the first guide sleeve 2.
When the existing suspension actuator works, the maximum displacement of the telescopic piston rod is limited by rigid collision of the piston with the guide sleeve and the cylinder cover, and the mode is easy to cause damage to the actuator. In order to prevent the piston from rigidly colliding with the guide sleeve and the cylinder cover, the suspension cylinder of the preferred embodiment of the invention is provided with a structure with a buffering function.
The buffering principle of the buffering structure is described in detail below.
When the upward movement amplitude of the piston rod 5 exceeds the working stroke of the piston rod, the annular boss 52 of the first guide sleeve 2 enters the second buffer cavity 11, oil liquid in the second buffer cavity 11 is extruded from the second buffer groove 10, the annular boss 52 of the first guide sleeve 2 gradually enters the second buffer cavity 11 matched with the annular boss 52 of the first guide sleeve, the throttling area of the second buffer groove 10 is gradually reduced until the second buffer cavity is closed, so that the upward movement resistance of the piston rod 4 is increased, the piston rod 4 performs deceleration movement until the piston rod 4 stops, and the piston rod 4 is prevented from colliding with the first guide sleeve 2.
When the downward movement amplitude of the piston rod 5 exceeds the working stroke of the piston rod, the free extension part 53 of the guide rod 3 enters the first buffer cavity 8, oil liquid in the first buffer cavity 8 is extruded from the first buffer groove 9, the extension part 53 free of the guide rod 3 gradually enters the first buffer cavity 8, the throttling area of the first buffer groove 9 is gradually reduced until the first buffer cavity is closed, the resistance on the downward movement of the piston rod 4 is increased, the piston rod 4 performs deceleration movement until the piston rod stops, and the piston rod 4 is prevented from colliding with the guide rod 3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. An integrated semi-active suspension actuator for an emergency rescue vehicle, comprising:
the cylinder barrel (1) comprises a bottom end and an opening end opposite to the bottom end along the axis direction;
a first guide sleeve (2) arranged on the open end of the cylinder barrel (1);
the guide rod (3) comprises a fixed end and a free end which is arranged opposite to the fixed end along the axis direction, and the fixed end is fixedly connected with a cylinder cover (7) arranged at the bottom end of the cylinder barrel (1);
the second guide sleeve (4) is sleeved on the free end of the guide rod (3);
the piston rod (5) is arranged between the cylinder barrel (1) and the guide rod (3) and can perform reciprocating telescopic motion between the first guide sleeve (2) and the second guide sleeve (4), and the piston rod (5) comprises a base end part and a top end part which is arranged opposite to the base end part along the axis direction;
a piston (6) provided at the base end of the piston rod (5);
a plug-in proportional throttle valve (12) provided at the tip end of the piston rod (5); the plug-in type proportional throttle valve (12) controls the opening degree of a main valve core (121) through a proportional pilot valve of the proportional throttle valve, and further continuously adjusts the flow area between a first duct (15) and a second duct (16) to realize stepless adjustment, wherein the first duct (15) is arranged in the top end part of the piston rod (5) along the axis of the piston rod (5), and the second duct (16) is arranged in the top end part of the piston rod (5) along the axis of the plug-in type proportional throttle valve (12) in an extending manner;
connecting block (13), its setting is in the top of piston rod (5), its characterized in that:
a groove (8) is formed in the bottom surface of the piston rod (5) facing the free end of the guide rod (3) at the top end, a protruding part (53) of the guide rod (3) protruding out of the second guide sleeve can be inserted into the groove (8), and the groove (8) forms a first buffer cavity; an annular stepped boss (51) is arranged at the base end part of the piston rod (5), the first guide sleeve (2) is provided with an annular boss (52) and a concave part (54) which is formed by the inner wall of the annular boss (52) and can accommodate the annular stepped boss (51), the outer diameter of the annular stepped boss (51) is equal to the inner diameter of the concave part (54), and a space enclosed between the inner wall of the cylinder barrel and the outer wall of the annular stepped boss (51) forms a second buffer cavity (11); and
when the upward movement amplitude of the piston rod (5) exceeds the working stroke of the piston rod, the annular boss (52) of the first guide sleeve (2) enters the second buffer cavity (11), oil liquid in the second buffer cavity (11) is extruded out of the second buffer groove (10), the annular boss (52) of the first guide sleeve (2) gradually enters the second buffer cavity (11) matched with the annular boss, the throttling area of the second buffer groove (10) is gradually reduced until the buffer groove is closed, so that the resistance of the upward movement of the piston rod (5) is increased, the piston rod (5) decelerates until the piston rod stops, and the piston rod (5) is prevented from colliding with the first guide sleeve (2);
when the downward movement amplitude of the piston rod (5) exceeds the working stroke of the piston rod, the free extension part (53) of the guide rod (3) enters the first buffer cavity, oil liquid in the first buffer cavity is extruded out of the first buffer groove (9), the free extension part (53) of the guide rod (3) gradually enters the first buffer cavity, the throttling area of the first buffer groove (9) is gradually reduced until the first buffer cavity is closed, so that the resistance of the downward movement of the piston rod (5) is increased, the piston rod (5) performs deceleration movement until the piston rod stops, and the piston rod (5) is prevented from colliding with the guide rod (3).
2. The integrated semi-active suspension actuator for an emergency rescue vehicle of claim 1, wherein:
a plurality of second buffer grooves (10) are uniformly distributed in the annular boss (52), the second buffer grooves (10) are matched with the second buffer cavity (11), and when the piston works normally, the annular boss (52) is positioned outside the second buffer cavity (11); extension portion (53) of guide bar (3) set up two first dashpots (9) on becoming 180 degrees angle directions, with the help of first dashpot (9), enable first cushion chamber cooperates the joint with extension portion (53) of guide bar (3), just during piston normal operating, extension portion (53) are located outside the first cushion chamber.
3. The integrated semi-active suspension actuator for an emergency rescue vehicle of claim 2, wherein: when the second buffer groove (10) gradually enters the second buffer cavity (11) matched with the annular boss (52) of the first guide sleeve (2) along with the annular boss (52), the throttling area of the second buffer groove (10) is gradually reduced until the second buffer groove is closed, so that the resistance on the upward movement of the piston rod (5) is increased, and the piston rod (5) performs deceleration movement until the piston rod stops; along with the gradual entry of guide bar (3) extension portion (53) in the first cushion chamber, the fluid in the first cushion chamber is extruded from first dashpot (9), and the throttle area of first dashpot (9) reduces gradually until closed for the resistance that piston rod (5) downward motion received is bigger and bigger, and piston rod (5) deceleration movement is until stopping.
4. The integrated semi-active suspension actuator for an emergency rescue vehicle of claim 2 or 3, wherein:
the plug-in proportional throttle valve (12) comprises a main valve element (121), a bushing (122), a valve sleeve (123), a cover plate (124), a pilot piston rod (125), a pilot valve end cover (126) and a proportional valve (127), wherein the main valve element (121) is arranged in a cavity of the bushing (122) and can reciprocate in the bushing (122) along the axial direction; the valve sleeve (123) is arranged between the bushing (122) and the cover plate (124), the valve sleeve (123) is in interference fit with the bushing (122), and is fixed with the cover plate (124) by adopting threaded connection; the cover plate (124) is arranged on the top end plane structure of the piston rod (5), the top of the cover plate (124) is sealed through a pilot valve end cover (126), and a proportional valve (127) is arranged on the side surface of the cover plate (124); the pilot piston rod (125) is provided on the axis of the valve sleeve (123) and the cover plate (124) and is capable of reciprocating in the axial direction.
5. The integrated semi-active suspension actuator for an emergency rescue vehicle of claim 1 or 2, wherein: a first actuating cavity (I) is formed between the piston rod (5) and the second guide sleeve (4), and the piston rod (5) extends into a space between the middle part of the cylinder barrel (1) and the inner wall of the cylinder barrel (1) to form a second actuating cavity (II); the top end of the piston rod (5) is provided with a first pipe joint hole (14) and a second pipe joint hole (18), the first pipe joint hole (14) is connected with the second actuating cavity through a first hole channel (15), a second hole channel (16) and a third hole channel (17), and the second pipe joint hole (18) is connected with the first actuating cavity through a fourth hole channel (19).
6. The integrated semi-active suspension actuator for an emergency rescue vehicle of claim 5, wherein: the diameters of the first pore canal (15), the second pore canal (16), the third pore canal (17) and the fourth pore canal (19) are all set to be 12 mm.
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| CN201910749891.3A CN110439951B (en) | 2019-08-14 | 2019-08-14 | Integrated semi-active suspension hydraulic actuator for emergency rescue vehicle |
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| CN110439951B true CN110439951B (en) | 2020-10-30 |
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| CN110805588A (en) * | 2019-11-28 | 2020-02-18 | 海航高科秦皇岛科技有限公司 | Gas buffering lateral force resisting hydraulic cylinder and lateral force resisting method thereof |
| CN111156274B (en) * | 2019-11-29 | 2021-11-02 | 中国北方车辆研究所 | Single-cylinder annular cavity high-pressure hydro-pneumatic spring |
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| CN107208402A (en) * | 2015-01-29 | 2017-09-26 | Ihc荷兰Ie有限公司 | Compensator device |
| CN107636344A (en) * | 2015-03-16 | 2018-01-26 | 悬挂***股份有限公司 | Hydraulic compression stop dog component for the hydraulic damper of vehicle suspension |
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