CN114109958B - Hydraulic steering centering oil cylinder - Google Patents
Hydraulic steering centering oil cylinder Download PDFInfo
- Publication number
- CN114109958B CN114109958B CN202111178966.0A CN202111178966A CN114109958B CN 114109958 B CN114109958 B CN 114109958B CN 202111178966 A CN202111178966 A CN 202111178966A CN 114109958 B CN114109958 B CN 114109958B
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- oil
- centering
- cylinder
- piston
- steering
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- 238000007667 floating Methods 0.000 claims abstract description 32
- 238000003466 welding Methods 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims description 42
- 230000003068 static effect Effects 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 230000008602 contraction Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims 2
- 238000003754 machining Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 196
- 239000010720 hydraulic oil Substances 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1404—Characterised by the construction of the motor unit of the straight-cylinder type in clusters, e.g. multiple cylinders in one block
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/10—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit
- B62D5/12—Piston and cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Actuator (AREA)
Abstract
The invention relates to a hydraulic steering centering oil cylinder which is used for solving the problems of complex structure and low reliability of a steering system caused by the existing split type structure. The hydraulic oil port welding device comprises a base, a centering oil cylinder, a fixed rod, a piston, a steering oil cylinder, an oil port welding seat, a floating piston, a guide sleeve and a piston rod, wherein a first extending oil cavity is formed among the base, the centering oil cylinder, the outer wall of the fixed rod and the piston, a fourth centering oil cavity is formed by an inner hole of the fixed rod and an inner blind hole of the piston rod, a fifth extending oil cavity is formed among the inner wall surface of the steering oil cylinder, the small-diameter outer circle of the floating piston and the annular end surface of a step part, a third centering oil cavity is formed among the guide sleeve, the piston rod, the inner wall surface of the steering oil cylinder and the large-diameter outer circle end surface of the floating piston, and a second contracting oil cavity is formed among the piston end surface and the annular boss of the steering oil cylinder. The invention realizes the steering and centering functions by using one oil cylinder and has the characteristics of simple and compact structure and high reliability.
Description
Technical Field
The invention relates to a hydraulic steering cylinder, belonging to the category of hydraulic machinery.
Background
The multi-axle vehicle is widely applied to the military field because of high horsepower and good bearing performance, and the number of axles of the vehicle is correspondingly increased along with the increase of the loading quality. The increase in the number of axles results in an increase in the length of the frame, which makes the tires of the vehicle wear severely during cornering and increases the radius of cornering. In order to improve the steering ability of the vehicle, all-wheel steering technology has been developed. The application of the all-wheel steering technology can greatly improve the steering maneuver performance of the vehicle and reduce the steering resistance, thereby reducing the fuel consumption of the vehicle and improving the driving range of the vehicle. Therefore, research on all-wheel steering technology is of great importance for improving the combat ability of wheeled vehicles.
At present, the all-wheel steering technology mainly has three realization forms: mechanical all-wheel steering, electric all-wheel steering, and hydraulic all-wheel steering systems. The mechanical all-wheel steering system realizes different angles of rotation of tires among different shafts through gear transmission, has a complex structure, needs to be connected with the shafts through a steering central shaft, occupies larger chassis space and is not suitable for vehicles with more shafts; the electric all-wheel steering is realized by driving the steering rod through the motor, the structure is simpler, the control is more flexible, but the electric all-wheel steering is not applicable to heavy-duty vehicles; the hydraulic all-wheel steering system drives a steering rod through a hydraulic actuating mechanism, hydraulic oil is input into a control valve system through an oil pump, and the deflection angle of tires of each shaft is controlled according to an instruction of an Electronic Control Unit (ECU) to realize all-wheel steering. The hydraulic pipeline is more convenient to arrange relative to the central shaft, and the requirement on arrangement space is lower; under the same volume, the force output by the hydraulic actuating mechanism is larger than that of the motor. Therefore, the hydraulic all-wheel steering system has wide prospect in realizing all-wheel steering of the multi-axle heavy-duty vehicle.
Because the steering system needs to be aligned back after turning to ensure that the vehicle runs normally and linearly, the hydraulic steering is usually provided with a centering oil cylinder or a centering device on the basis of arranging the steering oil cylinder, but the split type structure makes the steering system more complex in structure and inconvenient to arrange, and meanwhile, the system reliability is reduced due to the increase of the number of the hydraulic cylinders.
Disclosure of Invention
In order to solve the problems of complex structure and low reliability of a steering system caused by the existing split type structure, the invention provides a hydraulic steering centering oil cylinder, creatively provides an oil cylinder form integrating hydraulic steering centering, can realize steering function and centering function by using one oil cylinder, has the characteristics of simple and compact structure and high reliability, does not occupy excessive vehicle body arrangement space, and is suitable for a wheeled vehicle steering mechanism. The hydraulic steering oil cylinder specifically comprises a base, a centering oil cylinder, a fixed rod, a piston, a steering oil cylinder, an oil port welding seat, a floating piston, a guide sleeve and a piston rod, wherein the base is fixedly connected with the centering oil cylinder; one end of the steering cylinder is fixedly connected with the other end of the centering cylinder relative to the base, the other end of the steering cylinder is fixedly connected with the guide sleeve, the inner wall surface of the steering cylinder is provided with an annular boss, the floating piston is of an annular structure with a stepped section, wherein the small-diameter excircle penetrates through an annular boss center hole of the steering cylinder, and the large-diameter excircle is matched with the inner wall surface of the steering cylinder, so that a fifth extending oil cavity is formed between the inner wall surface of the steering cylinder and the first end surface of the annular boss, and between the small-diameter excircle of the floating piston and the annular end surface at the step; the free end of the piston rod sequentially passes through the central through hole of the small-diameter outer circular end surface of the floating piston and the central hole of the guide sleeve, so that a third centering oil cavity is formed among the guide sleeve, the piston rod, the inner wall surface of the steering oil cylinder and the large-diameter outer circular end surface of the floating piston, and a second shrinkage oil cavity is formed among the piston end surface and the annular boss of the steering oil cylinder.
The fixed rod is provided with a fixed seal groove and an opposite circular through hole on the circumferential surface matched with the base, the circular through hole is coaxial with the circumferential oil inlet of the base and is provided with an elastic cotter pin, the elastic cotter pin is communicated with the central hole of the fixed rod and the fourth centering oil cavity, the elastic cotter pin can be used for positioning the fixed rod axially and circumferentially, and the fixed seal groove on the upper circumferential surface of the fixed rod is provided with a fixed seal ring.
A sealing groove is formed in the circumferential direction of the matching surface of the steering oil cylinder and the centering oil cylinder, and a static sealing ring is arranged on the sealing groove and matched with the inner wall of the centering oil cylinder to generate enough compression rate for preventing high-pressure oil in the cylinder barrel from leaking.
A sealing groove is formed in the outer circle matching surface of the guide sleeve and the steering oil cylinder, a static sealing ring is arranged, a central through hole is formed in the guide sleeve, a sealing groove is formed in the inner wall of the central through hole, a guide belt and a combined seal are arranged, and the guide belt and the combined seal are matched with the outer circle of the piston rod to seal high-pressure oil in the third centering oil cavity.
A sealing groove is processed on the inner wall surface of the annular boss of the steering oil cylinder and is provided with a combined seal for isolating high-pressure oil in the second shrinkage oil cavity and the fifth extension oil cavity.
The outer circumference of the piston is provided with a guide belt and a dynamic seal, the wall surface of the central hole of the floating piston is provided with a seal groove, the seal groove is provided with a combined seal to separate high-pressure oil in the second shrinkage oil cavity from the third centering oil cavity, the outer circumference of the floating piston is provided with the seal groove, and the seal groove is provided with the combined seal to separate the high-pressure oil in the fifth extension oil cavity from the third centering oil cavity.
One end of the steering cylinder is connected with the other end of the centering cylinder relative to the base through threads or welding, and the other end of the steering cylinder is connected with the guide sleeve through threads or welding.
A step-shaped through hole is formed in the axial center of the piston and perpendicular to the end face, a piston rod is coaxially assembled in the step hole with the large diameter, and the piston rod is connected to the piston through threads or welding.
A sealing groove is formed in the inner periphery of a large-diameter step hole of the piston, a sealing ring is arranged in the sealing groove, the sealing groove is matched with the outer circle of the piston rod to generate enough compression ratio to prevent oil from leaking from a gap, a combined seal is arranged on the wall of a small-diameter step hole of the piston, the sealing groove is matched with the outer wall of a fixed rod to separate high-pressure oil in a first extending oil cavity from that in a fourth centering oil cavity, and a guide belt and the combined seal are assembled at the outer circle of the piston.
The outer wall of the steering cylinder is radially provided with three through holes serving as oil inlets, and three oil port welding seats are respectively fixed in the three radial through holes of the outer wall of the steering cylinder in a threaded or welding mode and are respectively communicated with the third centering oil cavity, the fifth extending oil cavity and the second contracting oil cavity.
The first extending oil cavity, the second contracting oil cavity and the fifth extending oil cavity are provided with separate oil pipes for controlling the oil pressure in the oil cavities, the third centering oil cavity and the fourth centering oil cavity are communicated by pipelines and are connected with an external accumulator, and the accumulator provides centering initial pressure P 0 。
The invention innovates the integrated oil cylinder structure integrating the steering and centering functions, realizes the isolation and orderly work of a plurality of oil cavities through ingenious design, can realize the functions of steering and centering by only assembling one steering and centering oil cylinder on each axle, greatly simplifies the difficulty of system arrangement compared with the traditional split structure, has the characteristics of high adjustment precision and the like, reduces the cost and has good application prospect.
Drawings
FIG. 1 is an overall block diagram of a hydraulic steering centering cylinder;
FIG. 2 is a cross-sectional view of a base;
FIG. 3 is a cross-sectional view of each oil inlet of the base;
fig. 4 is a schematic diagram of the operation of the hydraulic steering centering cylinder.
In the figure: 1. a base; 2. centering oil cylinder; 3. a fixed rod; 4. a piston; 5. a steering cylinder; 6. an oil port welding seat; 7. a floating piston; 8. a guide sleeve; 9. a piston rod; 10. a fourth centering oil cavity oil inlet; 11. a fourth centering oil chamber flow passage; 12. a first extended oil chamber; 13. a second contracting oil chamber; 14. a fourth centering oil chamber; 15. a fifth extending oil chamber; 16. a third centering oil chamber; 17. the third centering oil cavity oil inlet; 18. fifthly, extending out of an oil inlet of the oil cavity; 19. the second shrinkage oil cavity is provided with an oil inlet; 20. a joint A;21. a joint B;22. the first oil inlet extends out of the oil cavity; 23. the first extends out of the oil chamber flow passage.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1, the invention designs a hydraulic steering centering cylinder structure, which utilizes the assembly relation of all parts to form a first extending oil cavity 12, a second contracting oil cavity 13, a fourth centering oil cavity 14, a fifth extending oil cavity 15 and a third centering oil cavity 16, wherein the first extending oil cavity, the second contracting oil cavity, the fourth centering oil cavity 14, the fifth extending oil cavity 15 and the third centering oil cavity 16 are distributed in the centering cylinder 2, the steering cylinder 5 and the piston rod 9, and oil liquid separation in all the cavities is realized through a fixed rod 3, a piston 4, an annular boss on the inner wall of the steering cylinder 5, a floating piston 7 and the piston rod 9; meanwhile, each oil cavity is provided with an oil inlet and a flow channel, and the functions of extending, contracting and resetting centering of the oil cylinder piston rod 9 are realized by filling and discharging oil through an external hydraulic control loop.
The base 1 is connected with the centering oil cylinder 2 through threads or welding to ensure the sealing performance, a smooth round blind hole is machined at the center of the end face of the base 1, which faces one side of the centering oil cylinder 2, a hollow fixing rod 3 is axially assembled along the blind hole, an axial through hole is machined in the fixing rod 3 to serve as a fourth centering oil cavity flow channel 11, a static seal groove and an opposite round through hole are machined on the circumferential surface, which is in contact with the base 1, of the fixing rod 3, an elastic cotter pin which can enable oil to flow into the fourth centering oil cavity flow channel 11 is coaxial with the fourth centering oil inlet 10 in the circumferential direction of the base 1 and can be used for axially and circumferentially positioning the fixing rod 3, and a static seal ring is assembled in the static seal groove on the fixing rod 3 to be matched with the axial inner hole of the base 1 to generate enough compression ratio for sealing high-pressure oil of the centering oil cylinder 2 to leak from a matching gap between the fixing rod 3 and the base 1.
The axial center of the piston 4 is provided with a stepped through hole perpendicular to the end face, a piston rod 9 is coaxially assembled in the stepped hole with a large diameter, the piston rod 9 is connected to the piston 4 through threads or welding, a blind hole is formed in the center of one side, connected with the piston 4, of the piston rod 9, the blind hole of the piston rod 9 is coaxial with the small-diameter stepped through hole of the piston 4 in the same size, a sealing groove is formed in the circumferential direction in the large-diameter stepped hole, a sealing ring is arranged in the sealing groove, the sealing ring is matched with the outer circle of the piston rod 9 to generate enough compression ratio to prevent oil from leaking from a gap, a guide belt and a combined seal are assembled at the outer circle of the piston 4 and are used for separating oil in different oil cavities, and the piston 4, the piston rod 9, the sealing ring and other parts jointly form a piston rod assembly; the free end of the fixed rod 3 is inserted into the inner hole of the piston 4 and the blind hole of the piston rod 9 and is arranged in the centering oil cylinder 2, after the assembly is completed, a first extending oil cavity 12 is formed by the end face of the base 1, the inner wall of the centering oil cylinder 2, the outer wall of the fixed rod 3 and the end face of the piston 4, and a fourth centering oil cavity 14 is formed by the inner hole of the fixed rod 3 and the blind hole in the piston rod 9; the combined seal is arranged on the small-diameter step hole wall of the piston 4 and matched with the outer wall of the fixed rod 3, so that the separation of high-pressure oil in the first oil extending cavity 12 and the fourth oil centering cavity 14 is realized.
One end of the steering cylinder 5 is connected with the other end of the centering cylinder 2 opposite to the base 1 through threads or welding, a sealing groove is formed in the circumferential direction of a matching surface of the steering cylinder 5, a static sealing ring is arranged, and the static sealing ring is matched with the inner wall of the centering cylinder 2 to generate enough compression rate for preventing leakage of high-pressure oil in the cylinder barrel; the other end of the steering cylinder 5 is connected with the guide sleeve 8 through threads or welding, a sealing groove is processed on the excircle matching surface of the guide sleeve 8, a static sealing ring is arranged, sealing of high-pressure oil is achieved, and a center through hole is processed on the guide sleeve 8. An annular boss is processed on the inner wall surface of the steering cylinder 5, the floating piston 7 is of an annular structure with a stepped section, wherein a small-diameter excircle penetrates through an annular boss center hole of the steering cylinder 5, and a large-diameter excircle is matched with the inner wall surface of the steering cylinder 5, so that a fifth extending oil cavity 15 is formed between the inner wall surface of the steering cylinder 5 and the first end surface of the annular boss, and between the small-diameter excircle of the floating piston 7 and the annular end surface at the step; the center of the floating piston 7 is provided with a through hole with the diameter corresponding to the outer diameter of the piston rod, the free end of the piston rod 9 sequentially passes through the center through hole of the small-diameter outer circular end surface of the floating piston 7 and the center hole of the guide sleeve 8 and can respectively slide relative to the floating piston 7 and the guide sleeve 8, a third centering oil cavity 16 is formed among the guide sleeve 8, the inner wall surface of the steering cylinder 5 of the piston rod 9 and the large-diameter outer circular end surface of the floating piston 7, and a second shrinkage oil cavity 13 is formed among the end surface of the piston 4 and the annular boss of the steering cylinder 5. A sealing groove is formed in an inner hole of the guide sleeve 8, a guide belt and a combined seal are arranged, and the sealing groove is matched with the outer circle of the piston rod 9 to seal high-pressure oil in the third centering oil cavity 16; a seal groove is processed on the inner wall surface of the annular boss of the steering cylinder 5 and is provided with a combined seal for isolating high-pressure oil in the second contraction oil cavity 13 and the fifth extension oil cavity 15; the guide belt and the dynamic seal which are arranged on the outer circumference of the piston 4 realize the separation of high-pressure oil in the first extending oil cavity 12 and the second contracting oil cavity 13; the wall surface of the central hole of the floating piston 7 is provided with a sealing groove, a combined seal is arranged on the sealing groove to separate the high-pressure oil in the second shrinkage oil cavity 13 from the third centering oil cavity 16, the outer circle of the floating piston 7 is provided with a sealing groove, and the combined seal is arranged on the sealing groove to separate the high-pressure oil in the fifth extension oil cavity 15 from the third centering oil cavity 16.
Three through holes serving as oil inlets are radially formed in the outer wall of the steering oil cylinder 5, three oil port welding seats 6 are respectively fixed in the three through holes in the radial direction of the outer wall of the steering oil cylinder 5 in a threaded or welded mode, wherein a third centering oil cavity oil inlet 17 is communicated with a third centering oil cavity 16, a fifth extending oil cavity oil inlet 18 is communicated with a fifth extending oil cavity 15, and a second contracting oil cavity oil inlet 19 is communicated with a second contracting oil cavity 13; the oil inlets of the three different oil cavities are respectively connected with a hydraulic system pipeline through an oil port welding seat 6.
The base 1 of the hydraulic steering centering cylinder is provided with a connector A20, one end of a piston rod is provided with a connector B21, the connector A20 and the connector B21 are connected with a vehicle, the base 1 is provided with a fourth centering oil cavity oil inlet 10 and a first extending oil cavity oil inlet 22 in the circumferential direction, and hydraulic oil flows through the first extending oil cavity oil inlet 22, flows into the first extending oil cavity 12 through a first extending oil cavity runner 23.
The hydraulic steering cylinder has three working conditions: the piston rod 9 is extended, the piston rod 9 is contracted, and the piston rod 9 is reset and centered. The three working conditions are realized through the filling and discharging of the 5 oil cavities. The first extension oil chamber 12, the second contraction oil chamber 13 and the fifth extension oil chamber 15 have separate oil pipes for controlling the oil pressure inside the oil chambers, and the third centering oil chamber 16 and the fourth centering oil chamber 14 are communicated by pipelines and connected with an external accumulator, which provides a centering initial pressure P 0 。
Working condition 1: the piston rod 9 is extended
Hydraulic oil flows into the fifth extension oil chamber 15 through the fifth extension oil chamber oil inlet 18, flows into the first extension oil chamber 12 through the first extension oil chamber oil inlet 22 through the first extension oil chamber flow passage 23, the oil pressure P in the fifth extension oil chamber 15 and the first extension oil chamber 12 increases, and when P > P 0 During the process, the floating piston 7 and the piston 4 are pushed, because the sectional area of the floating piston 7 is smaller than that of the piston 4, the floating piston 7 moves before the piston 4, and the piston 4 moves to push the piston rod 9 to extend, so that the condition that the piston rod 9 extends is realized.
Working condition 2: the piston rod 9 is contracted
The hydraulic oil flows into the second contraction oil cavity 13 through the second contraction oil cavity oil inlet 19, the oil pressure P in the second contraction oil cavity 13 is increased, and when P is more than P 0 When the oil pushes the piston 4 to shrink, the volume of the fourth centering oil cavity 14 is reduced, the volume of the third centering oil cavity 16 is increased, the floating piston 7 is pushed leftwards, and the piston rod 9 is driven by the piston 4, so that the piston is shrunk.
Working condition 3: resetting and centering of piston rod 9
Cut off the supply of oil from the source and accumulator pressure P 0 As the system centering pressure, the third centering oil cavity 16 and the fourth centering oil cavity 14 are positioned at a high pressure position, the floating piston 7 and the piston 4 are pushed to an initial calibration neutral position, and the piston rod 9 achieves resetting centering. It is to be noted that the hydraulic steering cylinder to which the present invention relates can be easily understood by those skilled in the art, and various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. The utility model provides a fluid pressure type steering centering hydro-cylinder, includes base (1), centering hydro-cylinder (2), dead lever (3), piston (4), steering cylinder (5), hydraulic fluid port welding seat (6), floating piston (7), uide bushing (8), piston rod (9), its characterized in that: the base (1) is fixedly connected with the centering oil cylinder (2), a hollow fixed rod (3) is assembled on one side, facing the centering oil cylinder (2), of the base (1), the hollow piston (4) is fixedly connected with the piston rod (9), a blind hole is formed in the center of one side, connected with the piston (4), of the piston rod (9), the free end of the fixed rod (3) is inserted into the inner hole of the piston (4) and the blind hole of the piston rod (9) and is arranged in the centering oil cylinder (2), and then a first extending oil cavity (12) is formed among the base (1), the centering oil cylinder (2), the outer wall of the fixed rod (3) and the piston (4), and a fourth centering oil cavity (14) is formed by the inner hole of the fixed rod (3) and the inner blind hole of the piston rod (9); one end of the steering cylinder (5) is fixedly connected with the other end of the centering cylinder (2) opposite to the base (1), the other end of the steering cylinder (5) is fixedly connected with the guide sleeve (8), an annular boss is processed on the inner wall surface of the steering cylinder (5), the floating piston (7) is of an annular structure with a stepped section, wherein a small-diameter excircle penetrates through an annular boss center hole of the steering cylinder (5), and a large-diameter excircle is matched with the inner wall surface of the steering cylinder (5), so that a fifth extending oil cavity (15) is formed between the inner wall surface of the steering cylinder (5) and the first end surface of the annular boss, and between a small-diameter excircle of the floating piston (7) and the annular end surface at the step; the free end of the piston rod (9) sequentially passes through a central through hole of the small-diameter outer circular end surface of the floating piston (7) and a central hole of the guide sleeve (8), so that a third centering oil cavity (16) is formed among the guide sleeve (8), the piston rod (9), the inner wall surface of the steering oil cylinder (5) and the large-diameter outer circular end surface of the floating piston (7), and a second shrinkage oil cavity (13) is formed between the end surface of the piston (4) and the annular boss of the steering oil cylinder (5); the outer wall of the steering cylinder (5) is radially provided with three through holes serving as oil inlets, three oil port welding seats (6) are respectively fixed in the three radial through holes of the outer wall of the steering cylinder (5) in a threaded or welding mode and are respectively communicated with a third centering oil cavity (16), a fifth extending oil cavity (15) and a second contracting oil cavity (13), a first extending oil cavity oil inlet (22) and a first extending oil cavity runner (23) are arranged on the base (1) and are used for being communicated with the first extending oil cavity (12), and a fourth centering oil cavity oil inlet (10) is arranged on the base (1) and is used for being communicated with a fourth centering oil cavity (14).
2. The hydraulic steering centering cylinder as claimed in claim 1, wherein: the fixed rod (3) and the base (1) are provided with a static seal groove and opposite circular through holes in a machining mode on the circumferential surface, the circular through holes are coaxial with a fourth centering oil cavity oil inlet (10) in the circumferential direction of the base (1) and are provided with elastic cotter pins, the elastic cotter pins can be used for positioning the fixed rod (3) axially and circumferentially, and the static seal groove on the upper circumferential surface of the fixed rod (3) is provided with a static seal ring.
3. The hydraulic steering centering cylinder as claimed in claim 1, wherein: a sealing groove is formed in the circumferential direction of the matching surface of the steering oil cylinder (5) and the centering oil cylinder (2), and a static sealing ring is arranged on the sealing groove and matched with the inner wall of the centering oil cylinder (2) to generate enough compression rate for preventing leakage of high-pressure oil in the cylinder barrel.
4. The hydraulic steering centering cylinder as claimed in claim 1, wherein: a sealing groove is formed in the outer circle matching surface of the guide sleeve (8) and the steering oil cylinder (5), a static sealing ring is arranged, a central through hole is formed in the guide sleeve (8), a sealing groove is formed in the inner wall of the central through hole, a guide belt and a combined seal are arranged, and the guide belt is matched with the outer circle of the piston rod (9) to seal high-pressure oil in the third centering oil cavity (16).
5. The hydraulic steering centering cylinder as claimed in claim 1, wherein: a sealing groove is processed on the inner wall surface of the annular boss of the steering oil cylinder (5), and a combined seal is assembled and used for isolating high-pressure oil in the second shrinkage oil cavity (13) and the fifth extension oil cavity (15).
6. The hydraulic steering centering cylinder as claimed in claim 1, wherein: the outer circumference of the piston (4) is provided with a guide belt and a dynamic seal, the wall surface of the central hole of the floating piston (7) is provided with a seal groove, the seal groove is provided with a combined seal to separate high-pressure oil in the second shrinkage oil cavity (13) and the third centering oil cavity (16), the seal groove is processed at the outer circle of the floating piston (7), and the seal groove is provided with a combined seal to separate high-pressure oil in the fifth extension oil cavity (15) and the third centering oil cavity (16).
7. The hydraulic steering centering cylinder as claimed in claim 1, wherein: one end of the steering oil cylinder (5) is connected with the other end of the centering oil cylinder (2) opposite to the base (1) through threads or welding, and the other end of the steering oil cylinder (5) is connected with the guide sleeve (8) through threads or welding.
8. The hydraulic steering centering cylinder as claimed in claim 1, wherein: a step-shaped through hole is formed in the axial center of the piston (4) perpendicular to the end face, a piston rod (9) is coaxially assembled in the step hole with a large diameter, and the piston rod (9) is connected to the piston (4) through threads or welding.
9. The hydraulic steering centering cylinder as claimed in claim 1 or 8, wherein: the sealing groove is formed in the inner circumference of the large-diameter step hole of the piston (4) and is provided with a sealing ring, the sealing groove is matched with the outer circle of the piston rod (9) to generate enough compression ratio to prevent oil from leaking from a gap, the small-diameter step hole wall of the piston (4) is provided with a combined seal, the sealing groove is matched with the outer wall of the fixed rod (3) to separate high-pressure oil in the first extending oil cavity (12) and the fourth centering oil cavity (14), and the outer circle of the piston (4) is provided with a guide belt and the combined seal.
10. The hydraulic steering centering cylinder as claimed in claim 1, wherein: the first extension oil cavity (12), the second contraction oil cavity (13) and the fifth extension oil cavity (15) are provided with separate oil pipes for controlling the oil pressure in the oil cavities, the third centering oil cavity (16) and the fourth centering oil cavity (14) are communicated by pipelines and are connected with an external accumulator, and the accumulator provides centering initial pressure P 0 。
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| CN114475773B (en) * | 2022-04-15 | 2022-07-01 | 太重集团榆次液压工业(济南)有限公司 | Automatic steering power-assisted centering device for vehicle |
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