CN210555104U - Steering power cylinder assembly with stroke limit valve - Google Patents
Steering power cylinder assembly with stroke limit valve Download PDFInfo
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- CN210555104U CN210555104U CN201920812342.1U CN201920812342U CN210555104U CN 210555104 U CN210555104 U CN 210555104U CN 201920812342 U CN201920812342 U CN 201920812342U CN 210555104 U CN210555104 U CN 210555104U
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Abstract
The utility model relates to a hydraulic pressure steering power cylinder assembly with stroke limit valve. The stroke limiting valve comprises a stroke limiting valve body, wherein the stroke limiting valve body comprises a limiting spring, a limiting valve core, a limiting valve seat and a limiting valve sleeve, a stepped hole is drilled in one end of a piston rod installation piston along the axis direction, the stepped hole is composed of a large-diameter long hole and a small-diameter short hole, the limiting spring and the limiting valve core are sequentially placed in the large-diameter long hole, the limiting valve core is composed of a spring guide column, a valve head and a valve needle, the spring guide column is inserted into the limiting spring, two ends of the valve head are respectively in contact with the limiting spring and the limiting valve sleeve, the valve needle extends out of the limiting valve sleeve, the limiting valve sleeve is connected with the limiting valve seat in an interference mode, the limiting valve seat is in threaded connection with the piston rod. This application helping hand cylinder self sealss performance is good, reduces the steering system pressure, and the stroke is used in the control, can prolong hydraulic steering helping hand cylinder assembly life's device.
Description
Technical Field
The utility model relates to a power steering cylinder, specifically speaking are hydraulic pressure power steering cylinder assembly with stroke limit valve.
Background
With the acceleration of the networking construction of high-grade roads in China and the rapid development of logistics in various regions, the demand of large-tonnage vehicles by the road transportation industry is increasing day by day. The hydraulic steering power-assisted cylinder can greatly reduce the steering hand force of the vehicle, reduce the fatigue strength of a driver and provide reliable guarantee for the maneuverability and the sensitivity of automobile steering.
The corner limit of the vehicle is controlled by a limit screw arranged on the vehicle body; the pressure control is realized by a pressure relief valve arranged on an oil pump or a steering gear. Due to the inexpert or carelessness of a driver or a maintenance worker, the limit screw or the pressure safety valve is disabled or damaged after the vehicle maintenance or repair process. The pressure of a vehicle hydraulic system rises, and a steering axle bends; the working pressure of the power cylinder exceeds the design pressure; the travel is used beyond a maximum. Causing the piston rod of the power cylinder to bend and even break; the supporting seat and the ball pin are broken; the cylinder welding assembly is cracked to generate oil leakage. Finally, the power cylinder fails, and even traffic accidents and casualties occur.
Disclosure of Invention
The utility model aims at providing a simple structure reduces the steering system pressure, and control steering power cylinder uses the stroke, and extension hydraulic pressure turns to power cylinder assembly life's the steering power cylinder assembly that has the stroke limit valve.
The technical scheme of the utility model is that:
the power-assisted steering cylinder assembly with the stroke limiting valve comprises a cylinder barrel, a piston rod, a water inlet, a water outlet, a guide sleeve and a supporting seat, wherein the cylinder barrel is welded with the water inlet and the water outlet, one end of the cylinder barrel is welded with the supporting seat, the other end of the cylinder barrel is provided with the guide sleeve, the piston rod is arranged in the cylinder barrel, one end of the piston rod in the cylinder barrel is fixedly provided with the piston through a locking nut, the power-assisted steering cylinder further comprises the stroke limiting valve, the stroke limiting valve comprises a limiting spring, a limiting valve core, a limiting valve seat and a limiting valve sleeve, one end of the piston rod, which is provided with the piston, is drilled with a stepped hole along the axial direction, the stepped hole comprises a large-diameter long hole and a small-diameter short hole, the limiting spring and the limiting valve core are sequentially placed in the large-diameter long hole, the valve needle extends out of the limiting valve sleeve, the limiting valve sleeve is connected with the limiting valve seat in an interference mode, the limiting valve seat is connected with the piston rod through threads, and an oil return hole communicated with the small-diameter short hole is drilled in the diameter direction of the piston rod.
The utility model has the advantages that:
this application helping hand jar simple structure, the machine adds and the assembly manufacturability is strong, and self sealss performance is good, reduces the steering system pressure, and the stroke is used in the control, can prolong hydraulic steering helping hand jar assembly life's device.
The application helping hand jar increases the stroke limit valve on its assembly. When the piston moves to the limit positions at the two ends, the stroke limit valve starts to work, so that the system pressure is reduced to be below 3-5 MPa, and the steering parts and the power cylinder on the whole vehicle are protected. According to the actual use requirements of users, the limiting distance is adjusted when the vehicle leaves a factory, and secondary adjustment operation after loading is avoided. The device can protect the steering angle of the whole vehicle, reduce the pressure of a steering system and reduce the acting force born by each part of the steering system, thereby prolonging the service life of the whole vehicle and reducing the cost input of customers.
Description of the drawings:
fig. 1 is a first structural diagram of the present application.
Fig. 2 is a second structural diagram of the present application.
Fig. 3 is a third structural diagram of the present application.
Fig. 4 is an enlarged view of a portion a in fig. 1.
Fig. 5 is an enlarged view of fig. 2 at B.
Fig. 6 is an enlarged view of fig. 3 at C.
Fig. 7 is an enlarged schematic view of a sealing structure of the valve core and the limiting valve sleeve.
Detailed Description
In order to solve the technical problem in the background, the invention provides the power cylinder assembly with the stroke limiting valve.
The present application will now be described in detail with reference to the accompanying drawings:
the application has the steering power cylinder assembly of stroke limit valve and is equipped with the stroke limit valve on the basis of the steering power cylinder of current structure, and other structures of steering power cylinder are with prior art.
This application has steering power cylinder of stroke limit valve to divide into three kinds of structural style, and the first kind is equipped with the stroke limit valve on the piston rod, and the second kind is equipped with the stroke limit valve on the piston, and the third kind all is equipped with the stroke limit valve on piston rod and piston.
As shown in fig. 1 and 4, a stroke limit valve is mounted on the piston rod. The structure is selected when the power cylinder assembly needs stroke limit under the pressurized working condition of the piston rod. The concrete structure is as follows:
the steering power-assisted cylinder assembly with the stroke limit valve mainly comprises a cylinder barrel 1, a piston 2, a piston rod 3, an oil inlet 4, an oil outlet 5, a guide sleeve 6 and a supporting seat 7. An oil inlet and an oil outlet are welded on the cylinder barrel 1, a supporting seat is welded at one end of the cylinder barrel, a guide sleeve is installed at the other end of the cylinder barrel, a piston rod is installed in the cylinder barrel, and a piston is fixedly installed at one end of the piston rod in the cylinder barrel through a locking nut. The stroke limiting valve 8 is arranged on the piston rod, the stroke limiting valve 8 comprises a limiting spring 9, a limiting valve core 10, a limiting valve seat 11 and a limiting valve sleeve 12, a stepped hole 13 is drilled at one end of the piston rod, which is provided with the piston, along the axis direction, the stepped hole 13 consists of a large-diameter long hole 14 at the outer side and a small-diameter short hole 15 at the inner side, and the limiting spring and the limiting valve core are sequentially placed in the large-diameter long hole 14. The limiting valve core 10 is composed of a spring guide column 16, a valve head 17 and a valve needle 18, the spring guide column, the valve head and the valve needle are of an integral structure, the spring guide column 16 is inserted into the limiting spring 9, two ends of the valve head 17 are respectively contacted with the limiting spring and a limiting valve sleeve (one end of the valve head is contacted with one end of the limiting spring, the other end of the valve head is contacted with the inner end of the limiting valve sleeve), the valve needle 18 extends out of the limiting valve sleeve 12, the limiting valve sleeve is connected with a limiting valve seat in an interference mode, and the limiting valve seat 11 is connected with a piston rod. An oil return hole 19 communicated with the small-diameter short hole is drilled in the diameter direction of the piston rod, namely the oil return hole 19 is drilled in the diameter direction of the piston rod and communicated with the small-diameter short hole for oil supply.
As shown in fig. 2 and 5, a stroke limit valve is mounted on the piston. The structure is selected when the power cylinder assembly needs stroke limit under the condition that the piston rod is pulled. The concrete structure is as follows:
the steering power cylinder assembly with the stroke limiting valve comprises a cylinder barrel 1, a piston 2, a piston rod 3, oil inlet and outlet ports 4 and 5, a guide sleeve 6 and a supporting seat 7, wherein the oil inlet and outlet ports are welded on the cylinder barrel 1, the supporting seat is welded at one end of the cylinder barrel, the guide sleeve is installed at the other end of the cylinder barrel, the piston rod is installed in the cylinder barrel, and the piston is fixedly installed at one end of the piston rod in the cylinder barrel through a locking nut. The piston is provided with a stroke limit valve, the stroke limit valve 8 comprises a spring 9, a limit valve core 10, a limit valve seat 11 and a limit valve sleeve 12, a step through hole 13 is arranged on the piston, the step through hole is arranged at any position parallel to the axis, the step through hole is composed of a long hole 14 with a large diameter and a short hole 15 with a small diameter, the limiting valve comprises a limiting spring and a limiting valve core which are sequentially placed in a large-diameter long hole, wherein the limiting valve core 10 is composed of a spring guide column 16, a valve head 17 and a valve needle 18, the spring guide column, the valve head and the valve needle are of an integrated structure, the spring guide column is inserted into the limiting spring, two ends of the valve head are respectively in contact with the limiting spring and a limiting valve sleeve (one end of the valve head is in contact with one end of the limiting spring, the other end of the valve head is in contact with the inner end of the limiting valve sleeve), the valve needle extends out of the limiting valve sleeve, the limiting valve sleeve is connected with a limiting valve seat.
As shown in fig. 3 and 6, the piston and the piston rod are provided with stroke limit valves. The structure is selected when the piston rod of the power cylinder assembly needs stroke limit under the tension and compression working conditions. The concrete structure is to combine the above two modes. The mounting structure of the stroke limiting valve is the same as that described above, namely, shown in fig. 1, 4 and fig. 2 and 5.
As shown in fig. 7, one end of the valve head structure is a cylinder, the other end of the valve head is a hemisphere, one end 20 of the valve head cylinder is in contact with the limiting spring, one end 21 of the valve head hemisphere is in contact with the inner end side wall of the limiting valve sleeve, the cross section of the contact part of the limiting valve sleeve 12 and the valve head hemisphere end 21 along the axis direction is trapezoidal, and the limiting valve sleeve is in close contact with the valve head. The valve sleeve and the hemispherical end of the valve head form a seal to prevent leakage.
As shown in fig. 1, 2 and 3, the inner surface of the support seat is a plane, and the inner surface of the guide sleeve is a plane.
This application is through limiting spring's self spring action, promotes the valve head sphere of spacing case and the interior inseparable cooperation of limiting valve cover for two chambeies of helping hand cylinder are independent throughout in the use, have stopped the emergence of internal leakage phenomenon.
In order to avoid internal leakage of the thread pair, the thread surface of the limiting valve seat needs to be coated with a loctite 271 thread sealing and locking glue in the assembling process, and the glue is used for filling the gap between the thread pair to avoid the internal leakage; and the occurrence of the loosening phenomenon of the thread pair is prevented through the adhesive force of the glue.
The material of the limiting valve seat is QT 450-7. When the piston rod or the piston is screwed to the bottom of the piston, the piston rod or the piston is deformed under the action of rotating force, and the bottom surface of the limiting valve seat is indented, so that the gap between the piston rod (or the piston) and the limiting valve seat is prevented from being leaked, namely, the indentation is utilized to avoid the internal leakage phenomenon between the limiting valve and the piston rod or the piston.
This power cylinder limit valve assembly turns to simple structure, the machine adds and assembles the manufacturability strong, and self sealss performance is good, has eliminated because of increasing the emergence of the internal leakage phenomenon that limit structure brought, has prolonged the life of power cylinder assembly, has promoted the quality of power cylinder product, has won the extensive good comment on market.
According to the requirements of users, a stroke limit valve can be added on a piston or a piston rod of the power steering cylinder assembly. When the piston moves to the limit positions at two ends, the stroke limit valve is opened, the two cavities of the boosting cylinder are communicated, the system pressure is reduced to be below 3-5 MPa, and the protection effect on each steering component on the whole vehicle is achieved. According to the user requirements, the unloading distance is adjusted when the automobile leaves a factory, and secondary adjustment after loading is avoided.
The steering power-assisted cylinder assembly with the stroke limit valve is a steering device which has a simple structure, can reduce the pressure of a steering system and control the working stroke in the use process. The device can protect the steering angle of the whole vehicle, reduce the pressure of the steering system of the whole vehicle and reduce the working pressure of each part of the steering system, thereby prolonging the service life of the whole vehicle and reducing the cost input of users.
This application helping hand jar working process:
the stroke limiting valve with the structure is in a normally closed state in the use process. Namely, the limit valve core and the limit valve sleeve are tightly attached together through the self elastic action of the limit spring, so that the two cavities of the power cylinder are independent. When the power cylinder assembly runs to the limit positions at the two ends, the valve needle of the limiting valve core is in contact with the inner end face of the supporting seat or the guide sleeve, the limiting valve core moves backwards, the limiting valve core presses the limiting spring backwards to separate the valve head from the limiting valve sleeve, so that the two cavities of the power cylinder assembly are communicated, the pressure of the two cavities is equal, the piston of the power cylinder stops running, and the limiting and pressure reducing effects are realized.
The application is processing and the assembling process of key part and assembly among the helping hand cylinder:
1. processing of a limiting valve seat and a limiting valve sleeve assembly: firstly, the limiting valve seat and the limiting valve sleeve are processed according to part drawings, secondly, the limiting valve sleeve is placed on a tool base, the limiting valve seat is screwed into a tool press-fitting head, a press machine is started, a pressure head moves downwards slowly, the press-in force in the press-fitting process is 3-7KN until the limiting valve seat is pressed into the bottom of the limiting valve sleeve, the pressure head is lifted automatically, and the pressed assembly is screwed out manually, so that the press-fitting of the assembly is completed.
2. Assembly of structure one during production: according to the method 1, the limiting valve sleeve and the limiting valve seat are pressed in place, the piston rod is clamped by the three-jaw chuck, the limiting spring and the limiting valve core are sequentially placed into the large-diameter long hole of the piston rod, the thread sealing locking glue of Letai 271 is coated on the surface of the external thread of the limiting valve seat, the limiting valve seat is screwed into the bottom of the thread of the inner hole of the piston rod by a special wrench to complete assembly, and then the subsequent production can be carried out.
3. Assembling a second structure in the production process: according to the method 1, the limiting valve sleeve and the limiting valve seat are pressed in place, the piston is placed into a special tool to be clamped tightly, the limiting spring and the limiting valve core are sequentially placed into the large-diameter long hole of the piston, the surface of the external thread of the limiting valve seat is coated with a loctite 271 thread sealing locking glue, and the limiting valve seat is screwed into the bottom of the thread of the inner hole of the piston by a special wrench, so that other parts can be assembled.
4. Assembling a structure III in the production process: and (3) pressing the limiting valve sleeve and the limiting valve seat in place according to the method 1, completing the assembly of the limiting valve assembly on the piston according to the method 3, completing the assembly of the limiting valve assembly on the piston rod according to the method 2, installing the piston assembly with the limiting valve assembly on the piston rod, locking the piston assembly with the limiting valve assembly by using a locking nut, performing punching riveting, and turning to subsequent production.
However, any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention will still fall within the protection scope of the technical solution of the present invention without departing from the technical solution of the present invention.
Claims (5)
1. A steering power-assisted cylinder assembly with a stroke limit valve comprises a cylinder barrel, a piston rod, an oil inlet, an oil outlet, a guide sleeve and a supporting seat, wherein the oil inlet and the oil outlet are welded on the cylinder barrel, the supporting seat is welded at one end of the cylinder barrel, the guide sleeve is installed at the other end of the cylinder barrel, the piston rod is installed in the cylinder barrel, the piston is fixedly installed at one end of the piston rod in the cylinder barrel through a locking nut,
the method is characterized in that: the power cylinder further comprises a stroke limiting valve, the stroke limiting valve comprises a limiting spring, a limiting valve core, a limiting valve seat and a limiting valve sleeve, a stepped hole is drilled in one end of a piston rod installation piston along the axis direction, the stepped hole is composed of a large-diameter long hole and a small-diameter short hole, the limiting spring and the limiting valve core are sequentially placed in the large-diameter long hole, the limiting valve core is composed of a spring guide column, a valve head and a valve needle, the spring guide column is inserted into the limiting spring, two ends of the valve head are respectively in contact with the limiting spring and the limiting valve sleeve, the valve needle extends out of the limiting valve sleeve, the limiting valve sleeve is connected with the limiting valve seat in an interference mode, the limiting valve seat is in threaded connection with the piston rod, and an oil return hole communicated with the.
2. A steering cylinder assembly with a travel limit valve as set forth in claim 1, wherein: the piston is provided with a stroke limit valve, a stepped through hole is drilled at any position parallel to the axis of the piston, the stepped through hole consists of a large-diameter long hole and a small-diameter short hole, and the limit valve seat is connected with the piston through threads.
3. A steering power-assisted cylinder assembly with a stroke limit valve comprises a cylinder barrel, a piston rod, an oil inlet, an oil outlet, a guide sleeve and a supporting seat, wherein the oil inlet and the oil outlet are welded on the cylinder barrel, the supporting seat is welded at one end of the cylinder barrel, the guide sleeve is installed at the other end of the cylinder barrel, the piston rod is installed in the cylinder barrel, the piston is fixedly installed at one end of the piston rod in the cylinder barrel through a locking nut,
the method is characterized in that: the power cylinder further comprises a stroke limiting valve, the stroke limiting valve comprises a limiting spring, a limiting valve core, a limiting valve seat and a limiting valve sleeve, a step through hole is drilled in any position, parallel to the axis, of the piston, the step through hole is composed of a large-diameter long hole and a small-diameter short hole, the limiting spring and the limiting valve core are sequentially placed in the large-diameter long hole, the limiting valve core is composed of a spring guide column, a valve head and a valve needle, the spring guide column is inserted into the limiting spring, two ends of the valve head are respectively in contact with the limiting spring and the limiting valve sleeve, the valve needle extends out of the limiting valve sleeve, the limiting valve sleeve is connected with the limiting valve seat in an interference mode, and the limiting valve seat is.
4. A steering cylinder assembly with a travel limit valve according to claim 1, 2 or 3, wherein: the valve head is characterized in that one end of the valve head is a cylinder, the other end of the valve head is hemispherical, one end of the valve head cylinder is in contact with the limiting spring, the hemispherical end of the valve head is in contact with the side wall of the inner end of the limiting valve sleeve, the cross section of the contact part of the limiting valve sleeve and the hemispherical end of the valve head along the axis direction is trapezoidal, and the limiting valve sleeve and the valve head are in close.
5. A steering cylinder assembly with a travel limit valve according to claim 1, 2 or 3, wherein: the inner surface of the supporting seat is a plane, and the inner surface of the guide sleeve is a plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812342.1U CN210555104U (en) | 2019-05-31 | 2019-05-31 | Steering power cylinder assembly with stroke limit valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812342.1U CN210555104U (en) | 2019-05-31 | 2019-05-31 | Steering power cylinder assembly with stroke limit valve |
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| Publication Number | Publication Date |
|---|---|
| CN210555104U true CN210555104U (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920812342.1U Active CN210555104U (en) | 2019-05-31 | 2019-05-31 | Steering power cylinder assembly with stroke limit valve |
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| CN (1) | CN210555104U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111731378A (en) * | 2020-06-16 | 2020-10-02 | 东风商用车有限公司 | Steering power-assisted cylinder assembly with stroke unloading valve |
-
2019
- 2019-05-31 CN CN201920812342.1U patent/CN210555104U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111731378A (en) * | 2020-06-16 | 2020-10-02 | 东风商用车有限公司 | Steering power-assisted cylinder assembly with stroke unloading valve |
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